[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7925
Periodic Permanent Magnet Development for Linear Collider X-Band Klystrons
Abstract
The Stanford Linear Accelerator Center (SLAC) klystron group is
currently designing, fabricating and testing 11.424 GHz klystrons with
peak output powers from 50 to 75 MW at 1 to 2 mus rf pulsewidths as
part of an effort to realize components necessary for the construction
of the Next Linear Collider (NLC). In order to eliminate the
projected operational-year energy bill for klystron solenoids,
Periodic Permanent Magnet (PPM) focusing has been employed on our
latest X-band klystron designs. A PPM beam tester has operated at the
same repetition rate, voltage and average beam power required for a 75
MW NLC klystron. Prototype 50 and 75 MW PPM klystrons were built and
tested during 1996 and 1997 which operate from 50 to 70 MW at
efficiencies greater than 55%. Construction and testing of 75 MW
research klystrons will continue while the design and reliability is
perfected. This paper will discuss the design of these PPM klystrons
and the results of testing to date along with future plans for the
development of a low-cost Design for Manufacture (DFM) 75 MW klystron
and invitation for industry participation.
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