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High frequency planar accelerating structures for future linear colliders [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1994.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
20 pages : digital, PDF file
Additional Creators
United States. Department of Energy. Office of Energy Research and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Modern microfabrication techniques based on deep etch x-ray lithography, e.g., LIGA, can be used to produce large-aspect-ratio, metallic or dielectric, planar structures suitable for high-frequency RF acceleration of charged particle beams. Specifically, these techniques offer significant advantages over conventional manufacturing methods for future linear colliders (beyond NLC, the Next Linear Collider) because of several unique systems requirements. First, to have the required ac wall plug power within reasonable limits, such future linear colliders (5 TeV) must operate at high frequency (30 GHz). Secondly, luminosity requirements suggest the use of multi-bunch acceleration of electrons and positrons in the linear collider. Thirdly, in order to clearly discriminate physics events in the final interaction point at which electrons and positrons collide, it is required that secondary particle production from beamstrahlung be minimized. Flat electron and positron beams with a large aspect ratio will be beneficial in reducing beamstrahlung in the final focus region, but cause the beam to be more sensitive to wakefields in the vertical dimension. In principle, a flat beam can be accelerated in a planar structure with reduced wakefield in the vertical direction for the entire length of the accelerator. The LIGA process is particularly suitable for manufacturing miniaturized, planar, asymmetric cavities at high frequency. The main advantages of the LIGA process are fabrication of structures with high aspect ratio, small dimensional tolerances, and arbitrary mask shape (cross-section). Other advantages include mass-production with excellent repeatability and precision of up to an entire section of an accelerating structure consisting of a number of cells. It eliminates the need of tedious machining and brazing, for example, of individual disks and cups in conventional disk-loaded structures. Also, planar input/output couplers for the accelerating structure can be easily machined in the same process with the cavities. The new fabrication technique should substantially reduce the manufacturing cost of such accelerating structures.
Report Numbers
E 1.99:conf-940681--
conf-940681--
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
12/31/1994.
"conf-940681--"
"DE99001741"
6. advanced accelerator concepts workshop, Fontana, WI (United States), 13-18 Jun 1994.
Miller, R.; Wilson, P.; Yu, D.; Ruth, R.; Nassiri, A.; Ben-Menahem, S.
DULY Research Inc., Rancho Palos Verdes, CA (United States)
Funding Information
FG03-94ER86007
View MARC record | catkey: 14690909