TY - CONF AU - Tseng, F.H. AU - Chen, C.H. AU - Chou, P.J. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Optics Calibration for Routine Operations In Taiwan Photon Source J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - To ensure a stable performance of Taiwan Photon Source (TPS), we perform the calibration of accelerator optics using LOCO (Linear Optics from Closed Orbit) technique every month. After the optics and coupling corrections, the rms beta beatings in both planes are reduced to less than 1%. The emittance coupling ratio is also restored to within the design value. PB - JACoW Publishing CP - Geneva, Switzerland SP - 335 EP - 337 KW - optics KW - lattice KW - quadrupole KW - operation KW - coupling DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPGW093 UR - http://jacow.org/ipac2019/papers/mopgw093.pdf ER - TY - CONF AU - Chang, L.-H. AU - Chang, F.Y. AU - Chang, M.H. AU - Chang, S.W. AU - Chen, L.J. AU - Chung, F.-T. AU - Li, Y.T. AU - Lin, M.-C. AU - Liu, Z.K. AU - Lo, C.H. AU - Wang, Ch. AU - Yeh, M.-S. AU - Yu, T.-C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - An Approach to Alleviating Heavy Beam Loading Effect on the Synchrotron Machine Through the Existed Low Level RF Feedback System J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - To pursue the highest brightness and intensity of the synchrotron light, the synchrotron machines are pushed to operate with as high as possible of the beam current. To suppress the heavy beam loading effects, the direct RF feedback is currently widely used. This paper provides an another approach to alleviating the heavy beam loading effects on machine operation. Different from the direct RF feedback technique, this approach need not add additional feedback loop to the existed RF feedback system. Applying a proper angle rotation to the I-Q error signals of the cavity voltage, before entering the existed feedback loop, is the only action required in this approach. The paper will explain the working mechanism and investigate the behaviour of this approach, through an example case, with numerical simulation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 697 EP - 699 KW - cavity KW - feedback KW - beam-loading KW - impedance KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB057 UR - http://jacow.org/ipac2019/papers/moprb057.pdf ER - TY - CONF AU - Chen, H.H. AU - Chen, H.C. AU - Lin, K.-K. AU - Lin, Y.K. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - A Toolkit for Tracing Electron Beam Envelope at Low Energy Section of TPS Linac J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Based on calculated Bz of solenoids installed at the TPS linac low energy section, the electron beam envelope along beam centerline has been explored in this work using the initial and boundary conditions provided in the linac specifications. Concept of magnetic flux compression is adopt to analyze the beam size variation along linac centerline. The calculated result of selected checkpoints has been experimentally verified using screen monitors. In order to benefit tuning capability in routine operation, the display of beam size variation along centerline is integrated into the previously developed toolkit ’linac’. It is hope that it will provide an interactive approach for linac tune-up process and would be helpful to its routine operation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1122 EP - 1124 KW - electron KW - simulation KW - linac KW - operation KW - gun DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPTS104 UR - http://jacow.org/ipac2019/papers/mopts104.pdf ER - TY - CONF AU - Lee, A.P. AU - Chou, M.C. AU - Hsueh, H.P. AU - Hwang, J.-Y. AU - Lau, W.K. AU - Wang, P. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - The High Brightness Photo-injector for THz CUR/VUV FEL at NSRRC J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A high brightness photo-injector has been build for THz coherent undulator radiation and VUV free electron laser test facility at NSRRC. In the first phase, the photo-injector was used to produce ultra-short electron bunches for THz CUR generation. The electron beam is generated form a photocathode rf gun followed by a solenoid for emittance compensation. Then A 5.2 m S-band linac accelerates the electron beam and compresses the beam by velocity bunching. Since the beam emittance will grow during the velocity bunching process, a solenoid system was installed to reduce the emmitance growth. Downstream the linac, a quadruple magnet was use for emittance measurement by quadruple scan method and the bunch length was measured by the coherent transition radiation. Finally, the ultra-short electron bunch with about few hundreds picoseconds passes through a U100 planer undulator can produce THz coherent undulator radiation. The instrument setup and results of measurement are presented in this paper. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1125 EP - 1127 KW - radiation KW - electron KW - emittance KW - quadrupole KW - linac DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPTS105 UR - http://jacow.org/ipac2019/papers/mopts105.pdf ER - TY - CONF AU - Huang, Y.T. AU - Chan, C.K. AU - Chang, C.-C. AU - Cheng, C.M. AU - Chou, P.J. AU - Yang, Y.C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Preliminary Design of RF-Shielded Bellows J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A new design of RF-shielded bellows is proposed for the TPS to alleviate wake field effects and Joule heating resulting from contact resistance at the contact interface of sliding two dissimilar metals. Most efforts are put into controlling corrosion which is regarded as the main cause of electrical contact degradation. Rh-Au is chosen as a mating interface because they are stable under high temperature condition. Experimental tests are made to find an effective plating thickness of Rh and Au and to determine a suitable normal load applicable on the Rh-Au interface. A preliminary design of RF-shielded bellows that can sustain thousands of cycles during their lifetime is under testing. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1341 EP - 1343 KW - wakefield KW - interface KW - vacuum KW - shielding KW - experiment DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPMP041 UR - http://jacow.org/ipac2019/papers/tupmp041.pdf ER - TY - CONF AU - Yang, Y.C. AU - Chan, C.K. AU - Chang, C.-C. AU - Chen, A.Y. AU - Chuang, J.-Y. AU - Huang, C.H. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - The Beam Cleaning Analysis for the TPS Vacuum System J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Commissioning for the TPS, a low-emittance 3-GeV synchrotron ring, started in December 2014 and is now currently operating in top-up mode at 400mA for users. Until the last machine shut down in December 2018, a total beam dose of 4919 Ah was accumulated and the beam cleaning effect decreased the dynamic pressure to 1.5×10⁻¹¹ Pa/mA. During past years operation, several vacuum chambers were replaced to improve vacuum performance and avoid exposure to synchrotron radiation from insertion devices. In this paper, the beam cleaning evolution of new vacuum sections will be discussed and compared with experience in the rest of the storage ring. A particular cleaning evolution could be predicted and can be referenced for machine shutdown planning in the future. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1344 EP - 1346 KW - vacuum KW - MMI KW - radiation KW - operation KW - ECR DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPMP042 UR - http://jacow.org/ipac2019/papers/tupmp042.pdf ER - TY - CONF AU - Hsiung, G.Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Special Aluminum Gasket Sealing of Non-circular Profile Flanges for the Accelerator UHV Systems J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Most of the beam ducts for the accelerators are not regularly the circular profile. Unfortunately, the conflat (CF-) flanges and the gaskets with non-circular profile were not commercially available. Besides, additional RF-contact bridges between the flanges must be built in for mitigating the impedance from the flange-gaps. In this presentation, various types of the aluminum (Al-) gaskets designed for the non-circular profile Al-flanges for the accelerator ultrahigh vacuum (UHV) systems are introduced. The surface of the Al-flange is flat to accommodate the special Al-gasket with knife edges for the sealing. Both the flange and gasket are manufactured by the oil-free Ethanol-CNC-machining process that any non-circular profile, e.g. rectangular, race-track, key-hole, etc., flanges can be precisely produced. The inner diameters of the gasket just suits those of the flanges that the impedance from the gap is significantly reduced. The flanges and gaskets after oil-free machining can be assembled immediately without any chemical cleaning. The experimental results for the as-mentioned non-circular profile Al-flanges reveal the UHV quality at pressure < 20 nPa after vacuum baking. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1347 EP - 1349 KW - vacuum KW - impedance KW - photon KW - experiment KW - emittance DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPMP044 UR - http://jacow.org/ipac2019/papers/tupmp044.pdf ER - TY - CONF AU - Liang, C.C. AU - Chang, C.F. AU - Chang, C.Y. AU - Guo, Y.H. AU - Lee, M.H. AU - Liu, C.Y.L. AU - Yu, T.-C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - The Protection Instrument for Cryogenic Phase Separator Pressure Relief Valve of TPS Beamline J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - TPS (Taiwan Photon Source) beamlines have operated for three years after the successful commission in 2015. Recently, the electromagnetic activated pressure relief valve of cryogenic phase separator of beamline had malfunction due to the rust of its control circuits. After on site observation and temperature records, the water was found to be condensed around the outlet area due to fast temperature dropping near the valve as it was activated. Such situation would cause the rust of metal components due to humidity after a certain period of time. To avoid such event, fan is used to blow the condensed water and silicone heat belts are added to increase the local temperature with unique designed clamp for fixing the fan, sensors and safety circuit breaker. Via the temperature control system, the temperature monitoring, setting and the abnormal situation can be access on web page through Ethernet to make sure the proper operation of the protected devices. The instrument has been operated since Dec. 2018. After four months of operation, the moist situation has been improved and the relief valve is no longer frosted. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1350 EP - 1352 KW - controls KW - monitoring KW - software KW - operation KW - cryogenics DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPMP045 UR - http://jacow.org/ipac2019/papers/tupmp045.pdf ER - TY - CONF AU - Wang, B.S. AU - Huang, C.H. AU - Huang, J.C. AU - Liu, C.Y. AU - Liu, K.-B. AU - Wong, Y.S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Improvement the Bending Magnet Power Supply Performance for TPS Storage Ring J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In the TPS (Taiwan Photon Source) facility, current stability of the electron beam depends on the bending magnet power supply and an orbit FOFB system to compensate the magnetic field. Due to the output current stability of the bending magnet power supply drifts with temperature so the orbit FOFB system should be applied to fine tune magnetic field and the photon beam should circulate in storage ring. In this paper, to stabilize the temperature of regulation circuit’s temperature box of the bending magnet power supply, the long-term output current stability is improve from ± 50ppm to ± 10ppm, and orbit FOFB system substantially reduce the tune X of beam position, effectively increasing the beam current stability and quality. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1353 EP - 1355 KW - power-supply KW - storage-ring KW - feedback KW - controls KW - photon DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPMP046 UR - http://jacow.org/ipac2019/papers/tupmp046.pdf ER - TY - CONF AU - Chung, F.-T. AU - Chang, F.Y. AU - Chang, L.-H. AU - Chang, M.H. AU - Chang, S.W. AU - Chen, L.J. AU - Li, Y.T. AU - Lin, M.-C. AU - Liu, Z.K. AU - Lo, C.H. AU - Wang, Ch. AU - Yeh, M.-S. AU - Yu, T.-C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Upgrade of the Cryogenic Control System for SRF Modules at the Taiwan Light Source J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - An upgrade of the cryogenic control system for superconducting radio-frequency (SRF) modules of the Taiwan Light Source (TLS) has been completed. The biggest challenge was to recover all protection and operational functions, while minimizing the quantity of vented helium from SRF modules while replacing valve controllers. Gradually, this work was finished within several one- and ten-day scheduled machine shutdown periods for accelerator maintenance. No large helium vent nor pollution of the cryogenic system occurred during all component replacements and function verifications. Functions of the cryogenic electronics were improved, whereas the valve controllers are upgraded to new versions to increase reliability and availability. Communications with the data acquisition system was also secured by buffered signal processing module so that device shutdown of the data acquisition system will not interrupt the cryogenic valve operation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1356 EP - 1358 KW - controls KW - cryogenics KW - SRF KW - operation KW - interface DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPMP047 UR - http://jacow.org/ipac2019/papers/tupmp047.pdf ER - TY - CONF AU - Chiu, M.-S. AU - Chou, P.J. AU - Huang, J.C. AU - Lee, S.-Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Multi-Bend Achromat Lattice Design for the Future of TPS Upgrade J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We present a TPS upgrade option with the hybrid 7BA (H7BA) lattice. We also derive a simple formula on optimal dipole angle distribution among H7BA dipoles. The agreement is satisfactory. We also report preliminary results on the dynamic aperture (DA) optimization. Possible improvement on H7BA lattice is outlined. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1564 EP - 1566 KW - lattice KW - emittance KW - dipole KW - storage-ring KW - dynamic-aperture DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPGW070 UR - http://jacow.org/ipac2019/papers/tupgw070.pdf ER - TY - CONF AU - Chiu, M.-S. AU - Chen, B.Y. AU - Chen, C.H. AU - Chen, J.Y. AU - Cheng, Y.-S. AU - Chiu, P.C. AU - Chou, P.J. AU - Hsu, T.W. AU - Hu, K.H. AU - Huang, J.C. AU - Huang, P.Y. AU - Kuo, C.-C. AU - Lee, T.Y. AU - Liao, C.Y. AU - Lin, W.Y. AU - Liu, Y.-C. AU - Tsai, H.-J. AU - Tseng, F.H. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Optimization and Measurements on the Double Mini-Betay Lattice in the TPS Storage Ring J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Taiwan Photon Source (TPS) is capable of operat-ing in multi-bunch and single-bunch mode. To operate in a hybrid mode as requested by users, we developed a lattice with chromaticities of 0.8/2 (x/y) to provide higher single bunch currents. Beam dynamics simulations and lattice characterizations including dynamic aperture, frequency map analysis, tune shift with energy, tune shift with amplitude, and betatron coupling will be discussed in this report. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1567 EP - 1569 KW - lattice KW - betatron KW - injection KW - storage-ring KW - dynamic-aperture DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPGW071 UR - http://jacow.org/ipac2019/papers/tupgw071.pdf ER - TY - CONF AU - Huang, C.H. AU - Chang, H.-P. AU - Chen, C.H. AU - Cheng, Y.-S. AU - Chiu, P.C. AU - Fann, C.-S. AU - Hsu, K.T. AU - Hu, K.H. AU - Liao, C.Y. AU - Liu, Y.-C. AU - Wu, C.Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Beam Motion and Photon Flux Dips during Injection at the Taiwan Photon Source J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Taiwan photon source (TPS) is a 3 GeV synchrotron light source now in routine operation at the NSRRC. At the beginning of beam commissioning, significant photon flux dips could be observed at injection due to a blow-up of the beam size. To eliminate this transient effect, all four kickers were rematched. The leakage field was shielded and the induced current loops at vacuum chambers in the injection area were also eliminated. These efforts reduced the horizontal betatron oscillations and orbit distortions to around one-tenth. In order to decrease the recovery time of photon dips during injection, the operational chromaticity was reduced to improve incoherent effects. After all those improvements, the photon flux dips during injection dropped to 30 % and the recovery time to less than 1 msec. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1848 EP - 1850 KW - injection KW - kicker KW - photon KW - betatron KW - vacuum DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPRB081 UR - http://jacow.org/ipac2019/papers/tuprb081.pdf ER - TY - CONF AU - Huang, C.S. AU - Chen, B.Y. AU - Kuan, C.K. AU - Kuo, C.H. AU - Lee, T.Y. AU - Lin, W.Y. AU - Perng, S.Y. AU - Tseng, T.C. AU - Wang, H.S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Development of Operating Alarm System at TPS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Taiwan Photon Source (TPS) has many subsystems which includes magnet, power supply, vacuum, RF system, insertion device, control system, etc. Therefore, the operational and system check procedures are complex. In this paper, we summarize the routine operational procedures and propose an integrated operational alarm system that gathers machine information and sets high/low warning and fault limits for various signals which can help operators to quickly identify abnormal subsystems, thereby reducing machinery down time. The alarm system also has a wide range of applications, such as the event recording that helps the analysis after event. This new alarm system interface clearly indicates the machine status and improves operational efficiency. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2684 EP - 2686 KW - operation KW - controls KW - vacuum KW - storage-ring KW - EPICS DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW085 UR - http://jacow.org/ipac2019/papers/wepgw085.pdf ER - TY - CONF AU - Lin, W.Y. AU - Chen, B.Y. AU - Huang, C.S. AU - Kuo, C.H. AU - Lee, T.Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Control System Studio to Monitor Front End and Beamlines Status as well as Light Source Stability J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The primary task during a shift change at the Taiwan Photon Source Accelerator Operations team is to know the exact status of the machine, so that problems can be discovered immediately and solved when the machine behaves abnormal. To provide a stable beam during top-up operation, it is necessary to monitor closely the stability of the light source, of front end areas and beamlines. Should any abnormality occur, the operator would initiate initial troubleshooting and adjustments, inform users and sub-system staff members and perform subsequent first anal-yses and system optimizations. In this article, we describe how to sort through the nec-essary information with the Control System Studio (CSS) design page. There are currently seven beamlines in operation at the Taiwan Photon Source (05, 09, 21, 23, 25, 41, 45) and more new beamlines will be added in the future. Com-pared with other tools, CSS is intuitive and easy to revise. No matter weather adding new parameters or changing settings, the operation team can quickly get familiar with the machine status and perform an interface upgrade. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2687 EP - 2689 KW - electron KW - status KW - operation KW - controls KW - photon DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW087 UR - http://jacow.org/ipac2019/papers/wepgw087.pdf ER - TY - CONF AU - Lin, M.-C. AU - Lo, C.H. AU - Lu, M.-R. AU - Yeh, M.-K. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Multi-physics Computation and Deformation Testing of a Shell-type 1.5-GHz Cavity J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A copper prototype of a 1.5-GHz cavity was manufac-tured to simulate a superconducting radio-frequency cavity for technique development. Frequency tuning with longitudinal compression of this prototype and cryogenic cooling with liquid nitrogen were performed to examine the numerical results from finite-element models, mainly the corresponding shifts of the fundamental resonant frequency. An appropriate element option improved the accuracy of the resonant frequency and the distribution of the magnetic field. Effects of geometry distortion of an uneven length on the frequency shift of this shell-type cavity as loaded on longitudinal compression are also examined and discussed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2968 EP - 2971 KW - cavity KW - SRF KW - experiment KW - resonance KW - synchrotron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB065 UR - http://jacow.org/ipac2019/papers/weprb065.pdf ER - TY - CONF AU - Chen, C.H. AU - Chen, B.Y. AU - Chen, J.Y. AU - Chiu, M.-S. AU - Chou, P.J. AU - Hsu, T.W. AU - Huang, B.Y. AU - Kuo, C.-C. AU - Lin, W.Y. AU - Liu, Y.-C. AU - Tsai, H.-J. AU - Tseng, F.H. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Frequency Map Measurements at the TPS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Taiwan Photon Source (TPS) has been operated for several years since it’s first light in December 2014. TPS has achieved reliable routine operation at 500 mA with more than 10 hrs beam lifetime. The dynamic aperture measurements and associated Frequency Map Analyses (FMA) at TPS reveal the beam dynamics behavior with and without insertion devices. A preliminary measurement study by using the turn-by-turn BPMs and comparison with the model simulation results will be presented in this paper. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3240 EP - 3243 KW - resonance KW - dynamic-aperture KW - operation KW - MMI KW - storage-ring DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS053 UR - http://jacow.org/ipac2019/papers/wepts053.pdf ER - TY - CONF AU - Leitner, M. AU - Arbelaez, D. AU - Bassan, H. AU - Bruch, D.E. AU - Chen, C.W. AU - Corlett, J.N. AU - DeMello, A.J. AU - Garcia Fajardo, L. AU - Leitner, D. AU - Marks, S. AU - Martinez-Galarce, D.S. AU - McCombs, K.A. AU - Miller, T. AU - Munson, D.V. AU - Niu, J. AU - Nuhn, H.-D. AU - Ray, K.L. AU - Rowen, M. AU - Sadlier, D.A. AU - Schlueter, D. AU - Wallén, E.J. AU - Wolf, Z.R. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Development of the Vertically Polarizing Hard X-Ray Undulator Segments for the Linear Coherent Light Source Upgrade (LCLS-II) Project J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Linear Coherent Light Source II (LCLS-II) is a free electron laser facility currently in its final construction stage at Stanford Linear Accelerator Center. The project includes two variable-gap, hybrid-permanent-magnet undulator lines: A soft x-ray undulator line with 21 undulator segments optimized for a photon energy range from 0.2 keV to 1.3 keV and a hard x-ray undulator line with 32 undulator segments designed for a photon energy range from 1.0 keV to 25.0 keV. This paper focuses on the design, development, and performance of the hard x-ray undulator line which utilizes uniquely-developed, vertically-polarizing undulators. To fully compensate the magnetic force throughout the entire gap range these devices incorporate non-linear spring systems which permit the construction of relatively compact undulators. However, significant magnetic field repeatability challenges have been encountered during prototyping of this novel design. The paper describes the innovative design improvements that were implemented which lead to reaching the LCLS-II required performance. These final design solutions can also be advantageous improving the operation of any future undulator design. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3408 EP - 3413 KW - undulator KW - photon KW - operation KW - free-electron-laser KW - electron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THYPLM1 UR - http://jacow.org/ipac2019/papers/thyplm1.pdf ER - TY - CONF AU - Lee, T.Y. AU - Chen, B.Y. AU - Hsu, T.W. AU - Huang, B.Y. AU - Kuo, C.H. AU - Lin, W.Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - A Remote-Controlled Robot-Car in the TPS Tunnel J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A remote-controlled robot-car named ’PhotonBot’ was put into the TPS accelerator tunnel and is equipped with a 360 degrees LiDAR for SLAM and navigation, two cameras for perception and first-person view, and a thermal imaging system. The robot can be remotely controlled and can send data to a remote PC through Wi-Fi. With SLAM, it can go more freely without being restricted to a designated path. In order to ensure it can work continuously, there is a wireless charging station in case of a low battery. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3435 EP - 3438 KW - photon KW - controls KW - radiation KW - operation KW - laser DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THYYPLS3 UR - http://jacow.org/ipac2019/papers/thyypls3.pdf ER - TY - CONF AU - Chan, W.S. AU - Chang, F.-D. AU - Chen, C.S. AU - Chiu, Y.F. AU - Liu, J.C. AU - Tsai, Z.-D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Optimizing The Reliability of The Fire Alarm System in The Taiwan Photon Source J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The fire alarm system plays a critical role for the safety of building occupants. However, in the past two years from 2016 to 2017, occasionally false alarms at the Taiwan Photon Source (TPS) occurred. Results of more detailed observations indicated that radiation and/or electromagnetic interference (EMI) of the TPS accelerator disturb smoke detectors and signal line circuits (SLCs). Lead shielding covers, adjusting of the detector alarm verification time and a laser-based aspi-rating smoke detector were used to reduce the probabil-ity that fire alarms become activated to less than 0.5 times per year. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4026 EP - 4028 KW - detector KW - radiation KW - controls KW - shielding KW - storage-ring DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB088 UR - http://jacow.org/ipac2019/papers/thprb088.pdf ER - TY - CONF AU - Chang, J.-C. AU - Chan, W.S. AU - Tsai, Z.-D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Laboratory Exhaust Gas Treatment Systems at TPS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - There are three main laboratory exhaust gas treatment systems equipped at Taiwan Photon Source (TPS): acid/alkaline system for corrosive acids and alkalis, volatile solvents, and other hazardous chemicals; organic system for biological experiments; and general system for other gas. Gas is collected in hoods installed near the sources of contamination in laboratories. The contamination then is transported through duct to the gas treatment equipment installed outside of the TPS experimental hall. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4029 EP - 4031 KW - controls KW - synchrotron KW - status KW - photon KW - experiment DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB090 UR - http://jacow.org/ipac2019/papers/thprb090.pdf ER - TY - CONF AU - Chen, B.Y. AU - Hsu, T.W. AU - Huang, B.Y. AU - Huang, C.S. AU - Kuo, C.H. AU - Lee, T.Y. AU - Lin, W.Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - APPLICATION PROGRAMS FOR TPS BEAM TRIP ANALYSIS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - For the Taiwan Photon Source (TPS), the orbit inter-lock system is one of the most important machine pro-tection systems. It is the fastest and the most preferred system to detect abnormalities to prevent possible dam-ages caused by magnet power supply failures or subsys-tems failures. In order to monitor electron orbit changes during a beam trip, we developed the ’orbit monitoring and recording tool’, the ’TBT BPM analysis tool’ and the ’magnet power supply recording and analysis tool’ to assist us in the failure analysis as will be discussed in this paper. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4032 EP - 4034 KW - power-supply KW - kicker KW - electron KW - photon KW - operation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB091 UR - http://jacow.org/ipac2019/papers/thprb091.pdf ER - TY - CONF AU - Chou, P.J. AU - Chan, C.K. AU - Chang, C.-C. AU - Hsu, K.T. AU - Hu, K.H. AU - Kuan, C.K. AU - Sheng, I.C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Reduction of Beam Induced RF-Heating in the Horizontal Stripline Kicker at the TPS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In preparation for 500 mA operation at the Taiwan Pho-ton Source (TPS), we redesigned the horizontal stripline kicker for the beam feedback system to gain a smaller loss factor with higher shunt impedance. We introduced ground fenders (see Fig. 1) to this new design which resulted in the reduction of the loss factor and substantial increase of the kicker shunt impedance. The transverse profile of the kicker electrodes was matched to the race-track beam pipe in the straight sections to minimize broadband impedance. The ground fenders can reduce the leakage of image currents through the gaps between the two strip line electrodes and also help to achieve a better impedance matching for the TEM modes in the transmission lines formed by the stripline electrodes and beam pipe in the kicker. The RF design and analysis of trapped resonant modes in the kicker were simulated by the 3-D electromagnetic code GdfidL [1]. Results of the RF design and analysis of trapped resonant modes will be discussed together with analytical estimates of coupled bunch instabilities at a beam current of 500 mA. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4035 EP - 4038 KW - kicker KW - impedance KW - storage-ring KW - feedback KW - damping DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB092 UR - http://jacow.org/ipac2019/papers/thprb092.pdf ER - TY - CONF AU - Liu, Z.K. AU - Chang, F.Y. AU - Chang, L.-H. AU - Chang, M.H. AU - Chang, S.W. AU - Chen, L.J. AU - Chung, F.-T. AU - Li, Y.T. AU - Lin, M.-C. AU - Lo, C.H. AU - Wang, Ch. AU - Yeh, M.-S. AU - Yu, T.-C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - RF Data Acquisition and Soft Alarm System for the Taiwan Photon Source J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Taiwan Photon Source (TPS) is a modern, high brightness 3 GeV light source. A data acquisition pro-gram for the radio frequency (RF) system, including a transient data recorder, a long term data archiver and real time data monitoring, has been developed for the analysis of RF trips and RF system debugging. A soft alarm system is implemented as well utilizing EPICS and python packages. The hardware architecture and the functionality of the RF data acquisition and soft alarm system will be discussed in this article. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4039 EP - 4041 KW - SRF KW - EPICS KW - status KW - network KW - data-acquisition DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB093 UR - http://jacow.org/ipac2019/papers/thprb093.pdf ER - TY - CONF AU - Liu, Z.K. AU - Chang, F.Y. AU - Chang, L.-H. AU - Chang, M.H. AU - Chang, S.W. AU - Chen, L.J. AU - Chung, F.-T. AU - Li, Y.T. AU - Lin, M.-C. AU - Lo, C.H. AU - Wang, Ch. AU - Yeh, M.-S. AU - Yu, T.-C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Study of the System Stability for the Digital Low Level RF System Operated at High Beam Currents J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The purpose of a Low-Level Radio Frequency (LLRF) system is to control the amplitude and phase of the field in the accelerating cavity. A digital LLRF (DLLRF) system will be installed in the Taiwan Photon Source (TPS) storage ring in 2019. The system stability depends much on the feedback parameters. An instability of the cavity voltage controlled by a DLLRF was observed during machine tests with high beam current and low feedback gain. A simulation model for the digital LLRF system with beam-cavity interaction was developed to investigate this instability and simulations and machine test results will be presented here. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4042 EP - 4044 KW - cavity KW - LLRF KW - controls KW - feedback KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB094 UR - http://jacow.org/ipac2019/papers/thprb094.pdf ER - TY - CONF AU - Chen, C.L. AU - Chang, H.-P. AU - Fann, C.-S. AU - Tsai, K.L. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - A Monitoring System for TPS Linac J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Abstract Since 2014, TPS Linac system has been operating regularly. In order to keep a high stability during a long operating time, it is important to develop a monitoring system to monitor all sub-systems, parameters, including setting values, reading values, control inputs and outputs. This system is not only recording all above mentioned parameters, but also provides an efficient diagnosis in case of troubleshooting. Because the controlling system in TPS Linac is using Siemens S7-300 PLCs, Simatic WinCC is utilized to develop a historical archiving, operational analyses, and operator activities in operation. This paper attempts to show a complete solution for the integrated software structure and its resulting process analysis. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4272 EP - 4274 KW - linac KW - PLC KW - controls KW - operation KW - injection DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS069 UR - http://jacow.org/ipac2019/papers/thpts069.pdf ER - TY - CONF AU - Chen, H.Z. AU - Chen, C.H. AU - Cheng, Y.-S. AU - Hsu, K.T. AU - Hu, K.H. AU - Liao, C.Y. AU - Wu, C.Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Diagnostic Tool For CompactPCI Crates J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - On the control system hardware platform for the Taiwan Photon Source (TPS) more than half use CompactPCI crates. If a crate malfunctions, the internal crate card will not operate properly affecting accelerator operation. If the crate, however, could provide instant remote operational information, an opportunity exists to maintain or replace it in advance. Therefore, a diagnostic tool was developed to analyse and diagnose the condition of the crates. When abnormal operations occur, an alarm can be issued for early inspection and maintenance. This way it is possible to prevent the EPICS IOC from crashing by CompactPCI crates, which improves the reliability of accelerator operation. A detailed system architecture, implementation and progress will be discussed in this report. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4275 EP - 4277 KW - EPICS KW - controls KW - status KW - diagnostics KW - network DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS070 UR - http://jacow.org/ipac2019/papers/thpts070.pdf ER - TY - CONF AU - Huang, J.C. AU - Kitamura, H. AU - Kohda, T. AU - Yang, C.K. AU - Yang, C.S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Performance of TPS Cryogenic Permanent Magnet Undulators at NSRRC J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Development of cryogenic permanent magnet un-dulators (CPMUs) is the most recent activity for Phase-II beamlines at the Taiwan Photon Source. A hybrid-type CPMU with a period length of 15 mm, based on PrFeB permanent-magnet materials, is under construc-tion. A maximum effective magnetic field of 1.33 T at a gap of 4 mm is obtained at 80 K. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4278 EP - 4280 KW - undulator KW - vacuum KW - permanent-magnet KW - cryogenics KW - controls DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS071 UR - http://jacow.org/ipac2019/papers/thpts071.pdf ER - TY - CONF AU - Jan, J.C. AU - Chang, C.-C. AU - Chu, Y.L. AU - Huang, J.C. AU - Hwang, C.-S. AU - Kuo, C.Y. AU - Lin, F.-Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Field Measurements for a Superconducting Magnet at Room Temperature J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A superconducting multipole wiggler (SMPW) was fabricated at the National Synchrotron Radiation Research Center (NSRRC) and was installed in the Synchrotron Light Research Institute (SLRI). A 3.5 T field strength could be generated by the NbTi coils and the magnetic arrays are immersed in a liquid helium (LHe) bath. A removable mapping chamber, made from thin stainless steel sheets, was developed to allow field mapping in the narrow aperture of the SMPW. The mapping chamber provides a room temperature environment for the magnetic field mapping and enables an easier field scan in the cryostat. The design for the mapping chamber includes a blockage of heat transfer from room temperature to the LHe bath and is strong enough to resist deformations during evacuation. The mechanical design, strain simulation, thermal simulation, dummy test and measurement results with the mapping chamber will be discussed in this paper. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4281 EP - 4284 KW - multipole KW - vacuum KW - wiggler KW - superconducting-magnet KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS072 UR - http://jacow.org/ipac2019/papers/thpts072.pdf ER - TY - CONF AU - Chung, T.Y. AU - Chang, C.-H. AU - Chen, A.Y. AU - Chen, Y.W. AU - Huang, J.C. AU - Jan, J.C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Radiation Damage to Undulator Electronics at an Electron Accelerator J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Experience gained from commissioning and operation of three elliptical polarization undulators (EPU) at the TPS taught us that undulator driving systems can behave erratically following a beam dump or loss. In this work, we discuss possible harmful radiation sources in a storage ring and analyse the effect of lack of electronic component radiation resistance in the system. According to measurements of spatial radiation distribution at the TPS, we propose solutions and an improved design for Phase-II EPUs. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4285 EP - 4287 KW - radiation KW - electron KW - electronics KW - photon KW - neutron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS073 UR - http://jacow.org/ipac2019/papers/thpts073.pdf ER - TY - CONF AU - Yu, T.-C. AU - Chang, F.Y. AU - Chang, L.-H. AU - Chang, M.H. AU - Chang, S.W. AU - Chen, L.J. AU - Chung, F.-T. AU - Li, Y.D. AU - Lin, M.-C. AU - Liu, Z.K. AU - Lo, C.H. AU - Wang, Ch. AU - Yeh, M.-S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - The Commission of Home-made 500MHz 80kW Solid-state Amplifier in NSRRC J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Solid-state for high power RF application is an attracting and interesting technology which is now become popular in accelerator field. To adopt and master such technique, a 500MHz, 80kW solid-state amplifier is thus developed in NSRRC. The amplifier is consisted of 100 900W amplifier modules which are driving by identical modules. Each module contains input and output directional couplers and status monitoring circuits. To have longer life time and better performance, the RF power transistors are integrated with water cooled heat sink directly. In such way, the transistors have higher output power and better efficiency. The RF power of each module is combined through coaxial combiner while its DC power is provided by parallel connected DC power supplies which can provide better redundancy and reliability. The home-made solid-state amplifier is demonstrated to have quite high quality RF power and reliability with acceptable power combination efficiency. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4288 EP - 4291 KW - power-supply KW - ISOL KW - MMI KW - status KW - HOM DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS074 UR - http://jacow.org/ipac2019/papers/thpts074.pdf ER - TY - CONF AU - Chang, F.Y. AU - Chang, L.-H. AU - Chang, M.H. AU - Chang, S.W. AU - Chen, L.J. AU - Chung, F.-T. AU - Li, Y.T. AU - Lin, M.-C. AU - Liu, Z.K. AU - Lo, C.H. AU - Wang, Ch. AU - Yeh, M.-S. AU - Yu, T.-C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Performance Tests of a Digital Low-Level Rf-System at the TPS J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A digital low-level RF (DLLRF) control system for the cavity gap voltage is now common throughout the world. At the Taiwan Photon Source (TPS) we installed and operated a DLLRF in the booster ring in 2018 successfully and plan to install it also in the storage ring in 2019. Operational and beam loading tests of the DLLRF at the storage ring are ongoing. The performance of the DLLRF in the presence of a large number of 60 Hz harmonics and its stability for gap voltage and phase will be discussed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4292 EP - 4294 KW - LLRF KW - beam-loading KW - cavity KW - storage-ring KW - controls DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS075 UR - http://jacow.org/ipac2019/papers/thpts075.pdf ER -