Accelerator Structure Development for NLC / GLC *

The NLC (Next Linear Collider) and GLC (Global Linear Collider) [1,2] are e e linear collider proposals based on room-temperature accelerator technology – so called “warm machines” in comparison with the TESLA “cold machine” that is based on superconducting accelerator technology. There have been two major challenges in developing X-band (11.4 GHz) accelerator structures for the GLC/NLC. The first is to demonstrate stable, long-term operation at the high gradient (65 MV/m) that is required to optimize the machine cost. The second is to strongly suppress the beam induced long-range wakefields, which is required to achieve high luminosity. The development of high gradient structures has been a high priority in recent years. Nearly thirty X-band structures with various rf parameters, cavity shapes and coupler types have been fabricated and tested since 2000. This program has been a successful collaborative effort among groups at SLAC, KEK, FNAL and other labs. A summary of the main achievements and experiences are presented in this paper as well as a status report on the structure design, high power performance, manufacturing techniques, and other structure related issues.

[1]  Christopher Nantista,et al.  Novel accelerator structure couplers , 2003, Proceedings of the 2003 Particle Accelerator Conference.

[2]  C. Adolphsen,et al.  Normal-conducting rf structure test facilities and results , 2003, Proceedings of the 2003 Particle Accelerator Conference.

[3]  R. Ruth,et al.  Status of X-band standing wave structure studies at SLAC , 2003, Proceedings of the 2003 Particle Accelerator Conference.

[4]  R. Ruth,et al.  Traveling wave structure optimization for the NLC , 2001, PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268).

[5]  Acknowledgements , 1992, Experimental Gerontology.

[7]  R. Miller,et al.  A spectral function method applied to the calculation of the wake function for the NLCTA , 1996 .

[8]  W. B. Fowkes,et al.  Accelerator structure R&D for linear colliders , 1999, Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366).