• C. Burkhart, A.L. Benwell, T.G. Beukers, M.A. Kemp, R.S. Larsen, D.J. MacNair, M.N. Nguyen, J.J. Olsen, T. Tang
  SLAC, Menlo Park, California

A Marx-topol­o­gy klystron mod­u­la­tor is under de­vel­op­ment for the In­ter­na­tion­al Lin­ear Col­lid­er (ILC) pro­ject*. It is en­vi­sioned as a lower cost, small­er foot­print, and high­er re­li­a­bil­i­ty al­ter­na­tive to the pre­sent, bounc­er-topol­o­gy, base­line de­sign. The ap­pli­ca­tion re­quires 120 kV (±0.5%), 140 A, 1.6 ms puls­es at a rate of 5 Hz. The Marx con­structs the high volt­age pulse by com­bin­ing, in se­ries, a num­ber of lower volt­age cells. The Marx em­ploys solid state el­e­ments; IGBTs and diodes, to con­trol the charge, dis­charge and iso­la­tion of the cells. Ac­tive com­pen­sa­tion of the out­put is used to achieve the volt­age reg­u­la­tion while min­i­miz­ing the stored en­er­gy. The de­vel­op­men­tal test­ing of a first gen­er­a­tion pro­to­type, P1, has been com­plet­ed. This mod­u­la­tor has been in­te­grat­ed into a test stand with a 10 MW L-band klystron, where each is un­der­go­ing life test­ing. De­vel­op­ment of a sec­ond gen­er­a­tion pro­to­type, P2, is un­der­way. The P2 is based on the P1 topol­o­gy but in­cor­po­rates an al­ter­na­tive cell con­fig­u­ra­tion to in­crease re­dun­dan­cy and im­prove avail­abil­i­ty. Sta­tus up­dates for both pro­to­types are pre­sent­ed.

* ILC Reference Design Report, http://www.linearcollider.org/cms/?pid=1000437

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