Towards advanced electron beam brightness enhancement and conditioning.

Kim, K.-J. ; Carlsten, B. ; Dowell, D. ; Flottmann, K. ; Jensen, K. ; Petillo, J. ; Sessler, A. ; Stupakov, G.

Argonne National Laboratory

关键词: Expenditures;    Light Sources;    Linear Colliders;    Brightness;    Recommendations;   

DOI  :  10.2172/834030
RP-ID  :  ANL/APS/LS-305
RP-ID  :  W-31-109-ENG-38
RP-ID  :  834030

美国|英语

来源: UNT Digital Library

【 摘 要 】

The importance of developing higher-brightness electron beam sources for future accelerators was emphasized during the DOE-BESAC Subcommittee Meeting on the BES 20-Year Facility Roadmap held in Washington on February 20, 2003 [1]. The Subcommittee made a strong recommendation for an R&D program for high-brightness gun development. Spurred by this recommendation, a workshop was organized at Argonne National Laboratory on September 22-26, 2003 under the auspices of the ANL Theory Institute. About thirty experts in electron gun physics came for a week of intense discussion, reviewing the current state of the art and exploring ways to improve the performance of laser-driven rf photocathode guns, in particular whether an order of magnitude improvement of the beam brightness is feasible. Presentations given during the workshop can be found on the Internet at http://www.aps.anl.gov/asd/theory/presentations-online.html. This white paper grew out of the Argonne workshop. Its aim is to provide a summary of the ANL workshop and to propose an R&D program to develop advanced electron sources with an order of magnitude higher brightness than currently feasible. The budget for the R&D program for this purpose, discussed in Section 4, is estimated to be about $10M per year for ten years with an additional onetime start-up cost of $10M. Although expensive, the expenditure is well worthwhile in view of the tremendous benefits the higher brightness gun will bring in future accelerator development, in particular a fourth-generation light source based on x-ray free-electron laser (FEL) technology and a future linear collider, which together will cost about $10B. Facilities capable for general accelerator-based R&D have been and are constructed as a part of larger accelerator complexes for research in various scientific disciplines, generally without provision for their use for research in advancing accelerator science. Sophistication in accelerator devices has become such that it is now necessary to promote accelerator research in its own right to be pursued with strong participation by university groups.