Effects of the longitudinal impedances on non-adiabatic bunch manipulation at flattop of J-PARC MR

Tamura, Fumihiko; Omori, Chihiro*; Yoshii, Masahito*; Tomizawa, Masahito*; Toyama, Takeshi*; Sugiyama, Yasuyuki*; Hasegawa, Katsushi*; Kobayashi, Aine*; Okita, Hidefumi

Proceedings of 19th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.175 - 178, 2023/01

https://www.pasj.jp/web_publish/pasj2022/proceedings/PDF/FROA/FROA06.pdf

J-PARC MR delivers high intensity proton beams to the neutrino experiment. Eight bunches with high peak currents are extracted from the MR by the extraction kicker, therefore the neutrino beam has the similar structure. Intermediate Water Cherenkov Detector (IWCD) will be installed for the future experiments and the IWCD requires a time structure with low peaks. We consider bunch manipulation at flattop of the MR for reducing the peak current. It should be quickly done to avoid the significant loss of the beam power. The beam gap for the kicker rise time must be kept. We propose a non-adiabatic bunch manipulation using the multiharmonic rf voltage. The longitudinal impedance in the MR can affect the beam stability. The feasibility of the manipulation is discussed by using the longitudinal simulations.

Beam fast extraction tuning of the J-PARC main ring

Wei, G.; Koseki, Tadashi*; Tomizawa, Masahito*; Igarashi, Susumu*; Ishii, Koji*; Ando, Ainosuke; Takano, Jumpei*; Uota, Masahiko*; Fan, K.*; Hatakeyama, Shuichiro; et al.

Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.3918 - 3920, 2010/05

http://accelconf.web.cern.ch/AccelConf/IPAC10/papers/thpeb016.pdf

Analysis of sake yeast transcription system of galactose assimilating genes

Ikenaga, Hiroshi*; Tomizawa, Yuki*; Hikokubo, Kazuya*; Hayashi, Hidenori*; Masubuchi, Takashi*; Kamiyama, Osamu*; Sato, Katsuya; Narumi, Issey*

no journal, , 

no abstracts in English

Gene expression analysis of sake yeast generated by ion beam breeding technology

Tomizawa, Yuki*; Hayashi, Hidenori*; Masubuchi, Takashi*; Kamiyama, Osamu*; Sato, Katsuya; Narumi, Issei; Ikenaga, Hiroshi*

no journal, , 

no abstracts in English