TY - CONF AU - Sue, Y. AU - Futatsukawa, K. AU - Hasegawa, K. AU - Iijima, T. AU - Iinuma, H. AU - Inami, K. AU - Ishida, K. AU - Kawamura, N. AU - Kitamura, R. AU - Kondo, Y. AU - Mibe, T. AU - Miyake, Y. AU - Morishita, T. AU - Nakazawa, Y. AU - Otani, M. AU - Saito, N. AU - Takeuchi, Y. AU - Ushizawa, T. AU - Yamazaki, T. AU - Yasuda, H.Y. AU - Yotsuzuka, M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - A Bunch Structure Measurement of Muons Accelerated by RFQ Using a Longitudinal Beam-Profile Monitor With High Time Resolution J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - J-PARC E34 experiment intends to measure the anomalous magnetic moment and electric dipole moment of muon precisely by a different way from the previous experiment. In this experiment, a low-emittance muon beam is provided using the muons with the thermal energy and the four-stage linac. The demonstration of the first muon RF acceleration with an RFQ linac was conducted and the transverse profile of the accelerated muons was measured last year. As one of the remaining issues for the beam-diagnostic system, the longitudinal beam profile after the RFQ should be measured to match the profile to the designed acceptance of the subsequent accelerator. For this purpose, the new longitudinal beam monitor using the micro-channel plate is under development. The time resolution aims to be around 30 to 40 ps corresponding to 1 % of a period of an operation frequency of the accelerator, which is 324 MHz. On November 2018, the bunch structure of accelerated muons of 89 keV with the RFQ was measured using this monitor at the J-PARC MLF. The latest analysis result of this measurement will be reported in this poster. PB - JACoW Publishing CP - Geneva, Switzerland SP - 37 EP - 40 KW - rfq KW - experiment KW - linac KW - background KW - electron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOZZPLM2 UR - http://jacow.org/ipac2019/papers/mozzplm2.pdf ER - TY - CONF AU - Nakazawa, Y. AU - Hasegawa, K. AU - Hayashizaki, N. AU - Iinuma, H. AU - Iwashita, Y. AU - Iwata, Y. AU - Kawamura, N. AU - Kitamura, R. AU - Kondo, Y. AU - Mibe, T. AU - Morishita, T. AU - Otani, M. AU - Saito, N. AU - Sue, Y. AU - Yamazaki, T. AU - Yasuda, H.Y. AU - Yoshida, M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Development of Inter-Digital H-Mode Drift-Tube Linac Prototype with Alternative Phase Focusing for a Muon Linac in the J-PARC Muon G-2/EDM Experiment J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - An inter-digital H-mode drift-tube linac (IH-DTL) is developed in a muon linac at the J-PARC E34 experiment. IH-DTL will accelerate muons from 0.34 MeV to 4.5 MeV at a drive frequency of 324 MHz. Since IH-DTL adopts an APF method, with which the beam is focused in the transverse direction using the RF field only, the proper beam matching of the phase-space distribution is required before the injection into the IH-DTL. Thus, an IH-DTL prototype was fabricated to evaluate the performance of the cavity and beam transmission. As a preparation of the high-power test, a test coupler is designed and fabricated. In this paper, the development of the coupler and the result of the low-power measurement will be presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 606 EP - 609 KW - cavity KW - linac KW - DTL KW - coupling KW - experiment DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB017 UR - http://jacow.org/ipac2019/papers/moprb017.pdf ER - TY - CONF AU - Otani, M. AU - Futatsukawa, K. AU - Hasegawa, K. AU - Iinuma, H. AU - Ito, T. AU - Iwashita, Y. AU - Kitamura, R. AU - Kondo, Y. AU - Mibe, T. AU - Morishita, T. AU - Naito, F. AU - Nakazawa, Y. AU - Saito, N. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Disk and Washer Coupled Cavity Linac Design and Cold-Model for Muon Linac J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A disk and washer (DAW) coupled cavity linac (CCL) has been developed for a middle velocity part in a muon linac at the J-PARC E34 experiment. It will accelerate muons from v/c = 0.3 to 0.7 at an operational frequency of 1296 MHz. In this poster, the cavity designs, beam dynamics designs, and the cold-model measurements will be presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1924 EP - 1927 KW - cavity KW - linac KW - acceleration KW - emittance KW - operation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPRB117 UR - http://jacow.org/ipac2019/papers/tuprb117.pdf ER - TY - CONF AU - Iwashita, Y. AU - Fuwa, Y. AU - Geng, R.L. AU - Hayano, H. AU - Tongu, H. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - High Density Mapping for Superconducting Cavities J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - High density mapping system for superconducting cavities are under development. Testing on the stiffener X-ray mapping system at JLAB showed consistent results in comparison with simultaneously taken GM tube or ion chamber output signals. The system provides better visi-bility as shown by data briefly reported here. In addition to the temperature and the X-ray mapping, a sensitive magnetic field mapping system with high spatial density is also under development. The magnetic field sensor is AF755B, whose operations at cryogenic temperatures are already reported by other group. Our development status using the magnetic field sensor will be reported. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2860 EP - 2862 KW - cavity KW - cryogenics KW - radiation KW - status KW - operation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB025 UR - http://jacow.org/ipac2019/papers/weprb025.pdf ER -