Preliminary study on the RF tuning of CSNS DTL

YIN Xue-Jun; LI A-Hong; XIAO Yong-Chuang; CHEN Qiang; LIU Hua-Chang; GONG Ke-Yun; FU Shi-Nian

doi:10.1088/1674-1137/38/2/027002

Chinese Physics C> 2014, Vol. 38> Issue(2) : 027002 DOI: 10.1088/1674-1137/38/2/027002

Preliminary study on the RF tuning of CSNS DTL

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Abstract：
In the R&D of the CSNS Drift Tube Linac (DTL), the first unit tank with 28 drift tubes has been developed. The axial accelerating field is ramped from 2.2 MV/m to 3.1 MV/m in this tank. The required field flatness is less than ±2% with the standard deviation of 1% for the beam dynamics; the field stability should be less than 1% for machine stable operation. After successful alignment, RF tuning was carried out focusing on the field profile measurement. Four slug tuners and eleven post couplers were applied in this procedure. The ramped field and required stability had been achieved by fine adjustment of the slug tuners and post couplers. In this paper, the preliminary tuning results are presented and discussed.

References

[1]

YIN X J, GONG K Y, PENG J, SONG H, XIAO Y C, LI A H, LIU L, FU S N. The RD Status of DTL for CSNS. Science China Physics, Mechanics Astronomy, 2011. 54[2] Naito F, Ikegami M, Kato T et al. Mechanical and RF Properties of the DTL for the JAERI/KEK Joint Project. Proc. of LINAC2002. Gyeongju, Korea1, 2002. 359-361[3] Wangler T P. Principles of RF Linear Accelerators. Johnwiley Sons, Inc, 1998[4] David M.Pozar. Microwave Engineering and Applications. Pergamon Press, 1980[5] Natio F, Tanaka H, Ikegami M et al. Tuning of the RF Field of the DTL for the J-PARC. Proc. of PAC 2003. Portland, USA, 2003. 2835-2837[6] Alharbi N et al. Field Stabilization with Post Couplers for DTL tank 1 of Linac 4. CARE-Note-2006-012-HIPPI

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YIN Xue-Jun, LI A-Hong, XIAO Yong-Chuang, CHEN Qiang, LIU Hua-Chang, GONG Ke-Yun and FU Shi-Nian. Preliminary study on the RF tuning of CSNS DTL[J]. Chinese Physics C, 2014, 38(2): 027002. doi: 10.1088/1674-1137/38/2/027002

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Received: 2013-04-02
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Preliminary study on the RF tuning of CSNS DTL

Received Date: 2013-04-02
Accepted Date: 1900-01-01
Available Online: 2014-02-05

Abstract: In the R&D of the CSNS Drift Tube Linac (DTL), the first unit tank with 28 drift tubes has been developed. The axial accelerating field is ramped from 2.2 MV/m to 3.1 MV/m in this tank. The required field flatness is less than ±2% with the standard deviation of 1% for the beam dynamics; the field stability should be less than 1% for machine stable operation. After successful alignment, RF tuning was carried out focusing on the field profile measurement. Four slug tuners and eleven post couplers were applied in this procedure. The ramped field and required stability had been achieved by fine adjustment of the slug tuners and post couplers. In this paper, the preliminary tuning results are presented and discussed.