NDLI: Measuring and adjusting the path length at CEBAF

Content Provider	IEEE Xplore Digital Library
Author	Krafft, G.A. Crofford, M. Douglas, D.R. Harwood, S.L. Kazimi, R. Legg, R. Oren, W. Tremblay, K. Wang, D.
Copyright Year	1995
Description	Author affiliation: Continuous Electron Beam Accel. Facility, Newport News, VA, USA (Krafft, G.A.; Crofford, M.; Douglas, D.R.; Harwood, S.L.; Kazimi, R.; Legg, R.; Oren, W.; Tremblay, K.; Wang, D.)
Abstract	Accurately setting the path length around the machine is central to the proper operation of the CEBAF accelerator. The CEBAF main accelerator consists of two recirculating superconducting linacs operating at 1497 MHz fundamental frequency. The electron beam can recirculate up to five times through the two linacs before it is extracted to the experimental halls. In order to obtain maximum energy gain and minimum energy spread through the linacs, all passes should arrive at the beginning of the linacs in phase at the crest of the RF cycle. In this paper we explain how the arrival times of higher pass beams are measured with respect to the first pass to less than one degree of RF phase and how the path length around the machine is adjusted. Following a brief introduction to the CEBAF design and some local nomenclature, these topics will be discussed: differential RF phase measurement of time delay, the energy method of cresting the higher pass beams, results obtained with the measurement techniques, future plans and improvements to the devices, and finally, a set of conclusions.
Starting Page	2429
Ending Page	2431
File Size	426386
Page Count	3
File Format	PDF
ISBN	0780329341
DOI	10.1109/PAC.1995.505573
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-05-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Length measurement Linear accelerators Phase measurement Radio frequency Electron beams Energy measurement Time measurement Electron accelerators Wavelength measurement Delay effects
Content Type	Text
Resource Type	Article

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