Speaker
Masahito Yoshii
(High Energy Accelerator Research Organization)
Description
In a rapid cycling synchrotron, sinusoidal excitation using an LC resonant circuit is commonly used as the current pattern for the main magnets. In this case, dB/dt reaches its maximum value at the 1/4 cycle period, and the time variation of dB/dt is important in determining the required RF acceleration voltage. Multi-harmonic excitation can be considered as a method to reduce the time variation of the bending magnetic field. Mathematically, a 12.5% of 2ndharmonic can suppress dB/dt to 75%, i.e., B(t) = Bo + B1(cos(ωt)+0.125sin(2ωt)), which also leads to suppression of RF peak voltage. In this study, we compare the advantages of sinusoidal excitation and harmonic excitation using the J-PARC RCS as an example.
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Author
Masahito Yoshii
(High Energy Accelerator Research Organization)
Co-authors
Chihiro Ohmori
(Japan Proton Accelerator Research Complex)
Fumihiko Tamura
(Japan Atomic Energy Agency)
Dr
Hidefumi Okita
(Japan Atomic Energy Agency)
Katsushi Hasegawa
(High Energy Accelerator Research Organization)
Keigo Hara
(High Energy Accelerator Research Organization)
Kiyomi Seiya
(High Energy Accelerator Research Organization)
Kyosuke Adachi
(Japan Atomic Energy Agency)
Masahiro Nomura
(Japan Atomic Energy Agency)
Taihei Shimada
(Japan Atomic Energy Agency)
Yasuyuki Sugiyama
(High Energy Accelerator Research Organization)