TY - CONF AU - Stockli, M.P. AU - Clemmer, M.E. AU - Cousineau, S.M. AU - Draganic, I.N. AU - Dudnikov, V.G. AU - Garnett, R.W. AU - Han, B. AU - Justice, T.A. AU - Kang, Y.W. AU - Kleinjan, D. AU - Murray, S.N. AU - Pennisi, T.R. AU - Piller, C. AU - Rouleau, G. AU - Stinson, C. AU - Welton, R.F. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Operating the SNS RF H⁻ Ion Source with a 10% Duty Factor J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The SNS (Spallation Neutron Source) (radio-frequency) RF-driven, H⁻ ion source injects ~50 mA of H⁻ beam into the SNS accelerator at 60 Hz with a 6% duty factor. It injects up to 7 A·hrs of H⁻ ions during its ~14-week service cycles, which is an unprecedented lifetime for small-emittance, high-current pulsed H⁻ ion sources. The SNS source also features unprecedented low cesium consumption and can be installed and started up in <10 h. Presently, the LANSCE (Los Alamos Neutron Science CEnter) accelerator complex in Los Alamos is fed by a filament-driven, biased converter-type H⁻ source that operates with a high plasma duty factor of 10%. It needs to be replaced every 4 weeks with a ~4 day startup phase. The measured negative beam current of 16-18 mA falls below the desired 21 mA acceptance of LANSCE’s accelerator especially since the beam contains several mA of electrons. LANSCE and SNS are exploring the possibility of using the SNS RF H⁻ source at LANSCE to increase the H⁻ beam current and the ion source lifetime while decreasing the startup time. For this purpose, the SNS H⁻ source has been tested at a 10% duty factor by operating it at 120 Hz with 840 µs plasma pulses generated with ~30 kW of 2 MHz RF power, and extracting ~25 mA around-the-clock for 28 days. This, and additional tests and other considerations are discussed in this paper. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1951 EP - 1953 KW - ion-source KW - plasma KW - electron KW - neutron KW - LEBT DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS009 UR - http://jacow.org/ipac2019/papers/tupts009.pdf ER - TY - CONF AU - Wang, H. AU - Coriton, B.R.L. AU - Dudas, A. AU - Moeller, C.P. AU - Nelson, R.M. AU - Neubauer, M.L. AU - Rimmer, R.A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Magnetron R&D for High Efficiency CW RF Sources of Particle Accelerators J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The scheme of using a high efficiency magnetron to drive a superconducting or normal conducting radio frequency accelerator cavity needs not only injection phase locking but also amplitude modulation to compensate for the cavity’s microphonics, frequency change, variations of cavity voltage and beam current. To be able to do a fast and efficient modulation and to compensate the frequency pushing effect due to the anode current change, the magnetron’s magnetic field has to be trimmed by an external coil*. To facilitate this, a low eddy current magnetron body has been designed and built**. This paper will present the experimental results of such modulation on a conventional 2.45 GHz magnetron at the R&D test stand. In addition, the progresses on the injection lock test to a new 1497 MHz, 13kW magnetron prototype aimed for the CEBAF klystron replacement with newly built low level RF (LLRF) controller for the amplitude modulation will be reported. Based on these R&D results, a 915MHz, 2×75kW CW industrial heating type magnetron system is being developed to be used for the high efficiency (>80%) RF source to the electron accelerator for industrial applications. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2233 EP - 2236 KW - injection KW - cavity KW - electron KW - controls KW - klystron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEXXPLS1 UR - http://jacow.org/ipac2019/papers/wexxpls1.pdf ER - TY - CONF AU - Dudnikov, V.G. AU - Cummings, M.A. AU - Johnson, R.P. AU - Popovic, M. AU - Thurman-Keup, R.M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Development of a Beam Halo Monitor J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Our innovative approach is to design the Beam Halo Monitor, where beam induced synchrotron radiation will be used to monitor the beam Halo. This involves an original scheme of light collection using a coronograph for measuring beam halo. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2721 EP - 2723 KW - radiation KW - synchrotron-radiation KW - synchrotron KW - electron KW - optics DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW099 UR - http://jacow.org/ipac2019/papers/wepgw099.pdf ER - TY - CONF AU - Yonehara, K. AU - Cummings, M.A. AU - Johnson, R.P. AU - Kazakevich, G.M. AU - Moretti, A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Radiation Robust RF Gas Beam Detector R&D for Intensity Frontier Experiments J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A novel radiation robust RF gas beam detector has been demonstrated by using the Main Injector beam at Fermilab. The detector demonstrated a stable signal gain, fast response time, and high radiation resistivity with intense proton beams. The plasma process in the detector is studied to validate the plasma physics model. The result suggests that the detector is applicable for Long Baseline Neutrino Facility at Fermilab. To prepare for the LBNF, a proto type detector will be made and applied for the Neutrino at Main Injector target system. Progress of the project will be given in the presentation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2770 EP - 2772 KW - detector KW - cavity KW - GUI KW - plasma KW - electron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW115 UR - http://jacow.org/ipac2019/papers/wepgw115.pdf ER - TY - CONF AU - Abrams, R.J. AU - Cummings, M.A. AU - Johnson, R.P. AU - Kaplan, D.M. AU - Roberts, T.J. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Radiation Hard Sensor for Reactor Applications J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A novel method of measuring temperature of the coolant inside a reactor core is presented. The method, which is both standoff and non-invasive, is based on the interaction between an ultrasonic pulse and a delayed light pulse in the coolant. In the interaction, the light pulse, which is scattered backward by Brillouin scattering, is frequency-shifted. The frequency shift is dependent on the temperature and other parameters of the coolant. The light pulses and the ultrasound pulses are generated and detected outside of the core. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3545 EP - 3547 KW - laser KW - GUI KW - radiation KW - timing KW - detector DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPMP044 UR - http://jacow.org/ipac2019/papers/thpmp044.pdf ER - TY - CONF AU - Johnson, R.P. AU - Abrams, R.J. AU - Cummings, M.A. AU - Lobo, J.D. AU - Popovic, M. AU - Roberts, T.J. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Mu*STAR: A Modular Accelerator-Driven Subcritical Reactor Design J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Mu*STAR is an accelerator-driven molten-salt sub-critical reactor based on recent superconducting RF technological breakthroughs that allow a highly efficient and powerful proton accelerator to drive a spallation target inside a graphite-moderated, thermal-spectrum reactor. The additional spallation neutrons can be used to overcome the absorption of neutrons by fission products to allow a deeper burn than is possible with critical reactor designs. Simulations have shown that as much as seven times the energy that was extracted from used fuel from light water reactors can be produced by this method before the accelerator demands significant power from the reactor. Once the fuel rods have been converted from oxide ceramics to fluoride salts, in a process that is proliferation resistant (not chemical reprocessing), the fuel can be burned for centuries without increasing its volume while reducing its radio-toxicity. Our 2017 GAIN voucher grant supported studies by ORNL, SRNL, and INL to design and cost a Fuel Processing Plant to convert used nuclear fuel into the molten-salt fuel for Mu*STAR. Based on those studies, it seems possible to build Mu*STAR systems on existing sites where used fuel is stored, convert it to fluoride salts, and use it to provide affordable carbon-free electricity for centuries. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3555 EP - 3557 KW - site KW - neutron KW - target KW - operation KW - SRF DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPMP048 UR - http://jacow.org/ipac2019/papers/thpmp048.pdf ER - TY - CONF AU - Neubauer, M.L. AU - Cummings, M.A. AU - Dudas, A. AU - Johnson, R.P. AU - Kahn, S.A. AU - Kazakevich, G.M. AU - Popovic, M. AU - Rimmer, R.A. AU - Wang, H. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Injection Locked 1497 MHz Magnetron J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Muons, In is building an amplitude modulated phase-locked magnetron to replace the klystrons in CEBAF. To do that requires changing the magnetic field at a rate that would induce eddy currents in the standard magnetron. We report on the status of the project to make a stainless steel anode with copper elements to minimize heating while the stainless steel reduces eddy current effects. The construction of the magnetron is two months from completion, while the test stand is ready for delivery of the magnetron PB - JACoW Publishing CP - Geneva, Switzerland SP - 4322 EP - 4324 KW - klystron KW - status KW - cathode KW - operation KW - injection DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS090 UR - http://jacow.org/ipac2019/papers/thpts090.pdf ER - TY - CONF AU - Neubauer, M.L. AU - Dudas, A. AU - Johnson, R.P. AU - Kahn, S.A. AU - Kazakevich, G.M. AU - Popovic, M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Phase and Frequency Locked 350 MHz Magnetron J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The 120kW 350 MHz magnetron is being developed for a number of RF systems, chiefly among them, Niowave’s 10 MeV accelerator. Industri-al applications of the magnetron have also been explored. The CW magnetron can be operated in the pulse mode by a novel injection locking system. We report on the status of the program and progress to date PB - JACoW Publishing CP - Geneva, Switzerland SP - 4325 EP - 4327 KW - cathode KW - operation KW - injection KW - status KW - vacuum DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS091 UR - http://jacow.org/ipac2019/papers/thpts091.pdf ER -