Measuring the performance of the coaxial HOM coupler on a 2-cell TESLA-shapecopper cavity

WANG Fang; WANG Er-Dong; ZHANG Bao-Cheng; ZHAO Kui

doi:10.1088/1674-1137/33/6/007

Chinese Physics C> 2009, Vol. 33> Issue(6) : 440-443 DOI: 10.1088/1674-1137/33/6/007

Measuring the performance of the coaxial HOM coupler on a 2-cell TESLA-shapecopper cavity

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Abstract：
Coaxial High Order Mode (HOM) couplers have been fabricated at Peking University and their RF performance has been measured on a test device consisting of a coaxial transmission line and a 2-cell TESLA-shape copper cavity. The test results on the 2-cell TESLA-shape copper cavity with HOM couplers indicate that the coupler can cut off the fundamental mode TM₀₁₀ and absorb HOMs effectively after a careful adjustment. The optimal angle of the HOM coupler with the beam tube is found. The initial test results of HOM couplers are presented in this paper.

References

[1]

. Padamsee H, Knobloch J, Hays T. RF Superconductivity for Accelerators. New York: John Wiley Sons, Inc., 1998.3422. Brinkmann R, Floettmann K, Rossbach J et al. TESLA Technical Design Report. Hamburg: DESY, 2001. 423. Sekutowicz J, Ko K, Ge L et al. Design of a Low Loss SRFCavity for the ILC. Proceedings of 2005 Particle Accelera-tor Conference Tennessee, 2005. 3342-33444. Sekutowicz J. Higher Order Mode Coupler for TESLA. Pro-ceedings of 6th workshop on SRF. Virginia: 1993. 1-145. Kuzminski J, Spalek G, Bourque R. Design of HOM Cou-pler Prototype of the APT Superconducting RF Cavities.Proceedings of the 2001 Particle Accelerator onference.Chicago, 2001. 1086-10886. Dohlus M, Wipf S G, Kaljuzhny V. Higher Order Mode Absorption in TTF Modules in the Frequency Range ofthe Third Dipole Band. Proceedings of EPAC 2002. Paris,2002. 1473-1475

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WANG Fang, WANG Er-Dong, ZHANG Bao-Cheng and ZHAO Kui. Measuring the performance of the coaxial HOM coupler on a 2-cell TESLA-shapecopper cavity[J]. Chinese Physics C, 2009, 33(6): 440-443. doi: 10.1088/1674-1137/33/6/007

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Received: 2008-06-30
Revised: 2008-12-19

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沈阳化工大学材料科学与工程学院沈阳 110142

Measuring the performance of the coaxial HOM coupler on a 2-cell TESLA-shapecopper cavity

Corresponding author: WANG Fang,

Received Date: 2008-06-30
Accepted Date: 2008-12-19
Available Online: 2009-06-05

Abstract:

Coaxial High Order Mode (HOM) couplers have been fabricated at Peking University and their RF performance has been measured on a test device consisting of a coaxial transmission line and a 2-cell TESLA-shape copper cavity. The test results on the 2-cell TESLA-shape copper cavity with HOM couplers indicate that the coupler can cut off the fundamental mode TM₀₁₀ and absorb HOMs effectively after a careful adjustment. The optimal angle of the HOM coupler with the beam tube is found. The initial test results of HOM couplers are presented in this paper.