Design and study of a high-current 5-cell superconducting rf cavity

LIU Zhen-Chao

doi:10.1088/1674-1137/34/5/018

Chinese Physics C> 2010, Vol. 34> Issue(5) : 603-605 DOI: 10.1088/1674-1137/34/5/018

Design and study of a high-current 5-cell superconducting rf cavity

LIU Zhen-Chao ^,

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Abstract：
The Advanced Photon Source (APS) at Argonne National Laboratory is considering the development of a superconducting linac-based fourth-generation hard X-ray source to meet future scientific needs of the hard X-ray user community. This work specifically focuses on the design of an optimized 5-cell superconducting radio-frequency structure well suited for a high-energy, high-beam-current energy recovery linac. The cavity design parameters are based on the APS storage ring nominal 7 GeV and 100 mA beam operation. A high-current 5-cell cw superconducting cavity operating at 1.4 GHz has been designed. In order to achieve a high current, the accelerating cavity shape has been optimized and large end-cell beam pipes have been adopted. The beam break-up threshold of the cavity has been estimated using the code TDBBU, which predicts a high threshold beam current for a 7 GeV energy recovery linac model. A copper prototype cavity has been fabricated that uses half-cell modules, initially assembled by clamping the cells together.

References

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. Borland M, DONG X, Harkay K et al. Advanced PhotonSource ERL RD Activities. In: ERL09. USA: Ithaca, NY,20092. Borland M, Decker G, DONG X et al. APS ERL Upgradewith Many Long Undulators. In: ERL09. USA: Ithaca, NY,20093. LIU Z, Nassiri A, Waldschmidt G. Design and Copper Prototyping of a High-Current 5-Cell Superconducting RFCavity. In: ERL09. USA: Ithaca, NY, 20094. Ben-Zvi I. Physica C, 2006, 441: 21-305. Furuya T, Umemori K, Takahashi T et al. Development ofa 1.3GHz Superconducting 9-cell Cavity for ERL Use. In:ERL07. UK: Daresbury Laboratory, 20076. Liepe M. Conceptual Layout of the Cavity String of the Cornell Erl Main Linac Cryomodule. In: SRF2003. Ger-many: Travemunde/Lubeck, 20037. Beard K, Merminga L, Yunn B. Tools To Predict BeamBreakup in Recirculating Linacs. In: PAC03. USA: Port-land, Oregon, 2003

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LIU Zhen-Chao. Design and study of a high-current 5-cell superconducting rf cavity[J]. Chinese Physics C, 2010, 34(5): 603-605. doi: 10.1088/1674-1137/34/5/018

LIU Zhen-Chao. Design and study of a high-current 5-cell superconducting rf cavity[J]. Chinese Physics C, 2010, 34(5): 603-605. doi: 10.1088/1674-1137/34/5/018 shu

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Received: 2009-08-10
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Design and study of a high-current 5-cell superconducting rf cavity

Corresponding author: LIU Zhen-Chao,

Received Date: 2009-08-10

Accepted Date: 2009-10-09

Available Online: 2010-05-05

Abstract:

The Advanced Photon Source (APS) at Argonne National Laboratory is considering the development of a superconducting linac-based fourth-generation hard X-ray source to meet future scientific needs of the hard X-ray user community. This work specifically focuses on the design of an optimized 5-cell superconducting radio-frequency structure well suited for a high-energy, high-beam-current energy recovery linac. The cavity design parameters are based on the APS storage ring nominal 7 GeV and 100 mA beam operation. A high-current 5-cell cw superconducting cavity operating at 1.4 GHz has been designed. In order to achieve a high current, the accelerating cavity shape has been optimized and large end-cell beam pipes have been adopted. The beam break-up threshold of the cavity has been estimated using the code TDBBU, which predicts a high threshold beam current for a 7 GeV energy recovery linac model. A copper prototype cavity has been fabricated that uses half-cell modules, initially assembled by clamping the cells together.

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