NDLI: X-band PPM klystron development for JLC

Content Provider	IEEE Xplore Digital Library
Author	Chin, Y.H. Matsumoto, S. Mizuno, H. Morozumi, Y. Ohkawa, T. Ohya, K. Takata, K. Toge, N. Tokumoto, S. Kazakov, S. Larionov, A. Teryaev, V.
Copyright Year	2001
Description	Author affiliation: KEK, Tsukuba, Japan (Chin, Y.H.)
Abstract	In this paper, we summarize the status of X-band PPM klystron development for the Japan Linear Collider (JLC) project. The periodic permanent magnet (PPM) klystrons are under development in the two-stage/two-year project with Toshiba. The goal is to produce 50 MW output power with efficiency >50% at 1.5 /spl mu/s pulse length at the first klystron and then to advance to 75 MW with efficiency =55% at the second one. The first PPM klystron has been tested, and it achieved 56 MW power with 50% efficiency at the standard 1.5 /spl mu/s pulse length. Neither oscillation of the parasitic mode nor gun oscillations were observed. The particle transmission was found to be 100% when no RF signal is applied. The second PPM klystron is currently under high-power testing. It has improved water cooling system of a PPM circuit and the output cavity for 150 Hz operation. The RF system was also revised for a higher efficiency. To date (June 6, 2001), the PPM-2 klystron produced 73.2 MW at 1.4 /spl mu/s pulse length and 70 MW at 1.5 /spl mu/s pulse length with the efficiency of 54.5%. The maximum efficiency reached 56% at the specified cathode voltage. The high-power testing will be continued to attain a 75 MW output power with a standard 1.5 /spl mu/s pulse. Details of these developments and measurement results are presented.
Sponsorship	U.S. Dept. Energy
Starting Page	3792
Ending Page	3794
File Size	393357
Page Count	3
File Format	PDF
ISBN	0780371917
DOI	10.1109/PAC.2001.988255
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	Klystrons Circuit testing Power generation Voltage Cooling Cathodes Permanent magnets Damping Couplers Tellurium
Content Type	Text
Resource Type	Article

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