NDLI: Room temperature accelerator structures for linear colliders

Content Provider	IEEE Xplore Digital Library
Author	Miller, R.H. Jones, R.M. Adolphsen, C. Bowden, G. Dolgashev, V. Kroll, N. Li, Z. Loewen, R. Ng, C. Pearson, C. Raubenheimer, T. Ruth, R. Tantawi, S. Wang, J.W.
Copyright Year	2001
Description	Author affiliation: Stanford Linear Accelerator Center, Menlo Park, CA, USA (Miller, R.H.)
Abstract	Early tests of short low group velocity and standing wave structures indicated the viability of operating X-band linacs with accelerating gradients in excess of 100 MeV/m. Conventional scaling of traveling wave traveling wave linacs with frequency scales the cell dimensions with /spl lambda/. Because Q scales as /spl lambda//sup 1/2/, the length of the structures scale not linearly but as /spl lambda//sup 3/2/ in order to preserve the attenuation through each structure. For the NLC we chose not to follow this scaling from the SLAC S-band linac to its fourth harmonic at the X-band. We wanted to increase the length of the structures to reduce the number of couplers and waveguide drives which can be a significant part of the cost of a microwave linac. Furthermore, scaling the iris size of the disk-loaded structures gave unacceptably high short range dipole wakefields. Consequently, we chose to go up a factor of about 5 in average group velocity and length of the structures, which increases the power fed to each structure by the same factor and decreases the short range dipole wakes by a similar factor. Unfortunately, these longer (1.8 m) structures have not performed nearly as well in high gradient tests as the short structures. We believe we have at least a partial understanding of the reason and will discuss it below. We are now studying two types of short structures with large apertures with moderately good efficiency including: 1) traveling wave structures with the group velocity lowered by going to large phase advance per period with bulges on the iris, 2) /spl pi/ mode standing wave structures.
Sponsorship	U.S. Dept. Energy
Starting Page	3819
Ending Page	3821
File Size	369803
Page Count	3
File Format	PDF
ISBN	0780371917
DOI	10.1109/PAC.2001.988264
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-06-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature Linear accelerators Testing Iris Life estimation Frequency Attenuation Couplers Waveguide components Costs
Content Type	Text
Resource Type	Article

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