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Tuning of RF amplitude and phase of J-PARC DTL and SDTL

J-PARC DTLとSDTLのRFの振幅と位相の調整

Shen, G.; 佐甲 博之   ; 佐藤 進  ; 池上 雅紀*

Shen, G.; Sako, Hiroyuki; Sato, Susumu; Ikegami, Masanori*

J-PARCリニアックのビームコミッショニングにおいてRFの振幅と位相の精密調整を行った。位相スキャン法を用いて、全RF空洞、すなわち、バンチャー,デバンチャー,DTL(Drift Tube LINAC),SDTL(Separate-type DTL)について調整を行った。測定されたビームエネルギーの絶対値とモデルを比較することにより、位相に関して1度、振幅に関して1%以内の精度で正確な設定値が決定された。本論文ではRF調整の詳細な方法を発表する。

An accurate tuning has been performed for the RF amplitude and phase of J-PARC (Japan Proton Accelerator Research Complex) LINAC during the beam commissioning. The tuning has been performed using a phase-scan method for all RF cavities, including buncher, debuncher, DTL (Drift Tube LINAC), and SDTL (Separate-type DTL). An adequate set-point is determined with satisfied accuracy, which is within 1$$^{circ}$$; for phase and 1% for amplitude, by matching measured absolute beam energy with those from a modeling. This paper presents detail procedures of RF tuning.

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