NDLI: SLAC modulator availability and impact on SLC operation

Content Provider	IEEE Xplore Digital Library
Author	Donaldson, A.R. Ashton, J.R.
Copyright Year	1995
Description	Author affiliation: Linear Accel. Center, Stanford Univ., CA, USA (Donaldson, A.R.; Ashton, J.R.)
Abstract	In 1991, the Stanford Linear Collider (SLC) operated, with diverse accelerator systems, at 60% availability. In the more auspicious 1992 and 1993 runs availability improved to over 80%. For the 94/95 run, the availability was also about 80%. Ignoring the eclectic-accelerator, this discussion will assess the dependence of the SLC on the reliability and hence, availability, of 244 klystron modulator systems that provide power to the machine's bunched-particle beams. Klystron modulator availability must be 99% for the accelerator to function at the 75% level. Fortunately, an excess of modulator/klystrons provides some redundancy and, therefore, allows some freedom from the requirement that all 244 systems perform simultaneously. There are, however, 15 specific exceptions. They populate strategic positions at the injector, damping rings, and positron production area of the accelerator complex. These, systems-without-spares, directly influence overall accelerator availability. Their calculated availability as an ensemble is 90%, but by chance they have operated at up to 99%. Individually, a malfunction can bring an experimental program to a halt. The discussion includes a description of several improvements to increase future availability for the modulator system.
Starting Page	668
Ending Page	670
File Size	355410
Page Count	3
File Format	PDF
ISBN	0780329341
DOI	10.1109/PAC.1995.504751
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	Klystrons Availability Optical modulation Pulse transformers Pulse width modulation Damping Space vector pulse width modulation Linear accelerators Power system reliability Redundancy
Content Type	Text
Resource Type	Article

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