Tuning of RF amplitude and phase for the drift tube linac in J-PARC

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SHEN Guo-Bao and Masanori Ikegami. Tuning of RF amplitude and phase for the drift tube linac in J-PARC[J]. Chinese Physics C, 2009, 33(7): 577-582. doi: 10.1088/1674-1137/33/7/014
SHEN Guo-Bao and Masanori Ikegami. Tuning of RF amplitude and phase for the drift tube linac in J-PARC[J]. Chinese Physics C, 2009, 33(7): 577-582.  doi: 10.1088/1674-1137/33/7/014 shu
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Received: 2008-09-09
Revised: 2008-10-31
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Tuning of RF amplitude and phase for the drift tube linac in J-PARC

    Corresponding author: SHEN Guo-Bao,

Abstract: 

The J-PARC linac has three DTL tanks to accelerate the negative hydrogen ions
from 3 MeV to 50 MeV. The RF phase and amplitude are adjusted for each
cavity with a phase scan method within the accuracy of 1° in phase and
1% in amplitude. The experimental results show a remarkable agreement
with the numerical model within a sufficient margin in the tuning of the last two DTL tanks. However, a notable discrepancy between the experiment and the numerical model is seen in the tuning of the first DTL tank. After studying with a three-dimensional multi-particle simulation, the generation of the low energy component and the pronounced filamentation are identified as the main causes of the discrepancy. The optimization of the tuning scheme is also discussed to attain the tuning goal accuracy for the first DTL tank.

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