LIFE-SPAN DIAGNOSIS ABOUT HV COMPONENTS FOR THE KLYSTRONMODULATORS OF KEKB INJECTOR LINAC
Hiroyuki Honma#, Hiromitsu Nakajima, Mitsuo Akemoto, Tetsuo Shidara, Shinichiro Michizono
KEK, High Energy Accelerator Research Organization, Accelerator Laboratory
1-1 Oho, Tsukuba-shi, Ibaraki-ken, 305-0801

Abstract

Degradation phenomena in the high voltage transformers of the KEKB linac klystron modulators wereinvestigated aiming to use the existing resonant charging type modulators in the Super KEKB project. Although about
10 inverter charging type modulators will be newly introduced in SuperKEKB injector linac, we still have remaining 50
conventional type modulators, utilizing rectifier and charging transformers. For the stable operation of klystron
modulators, reviews of the degradation in the insulating paper as well as in the insulating oil characteristics of thetransformers are inevitable. The way to judge their degradation, based on the life-span dependence on the applied
electric-field strength, is presented in this report.
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[1] H.Honma,et al.,”KEKBßÅZsV`ewxo_pv y a y ? Ć ƥ  ,Proceedings of the 25th Linear
Accelerator Meeting in Japan, Himeji, July 12-14, 2000
[2] JIS C2320[3] ƩĪ¢¾ōŔŗ 54 ä ŗ 5 ¼ 1? 1 ĭ ÒÊÅ?ØŜŀÉƹƺŤũĭY`ƜŢçÒ²4.

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