Status of experiments at LLNL on high-power X-band microwave generators
Intense Microwave Pulses II
Thisisa preprintof• paperintendedforpublicationin• journal orproceedin M. Since chansesmaybe madebeforepublication, this preprintis madeavailablewith the understandin$ thatit will notbe citedm'reproduced withoutthepermissionof the author. 9 . 13ISTRIB'U"TtON OF THTS DOCUMENT IS UNLIMITED I DISCLAIMER This document was prepared as m _-coumo( work spemoredby ,m qmc? of the Un_ed States GovernmenL Nei_er theUnited StatesGovernmentnor lhe University of Cdiforn_ nor my _ tbdr ml_oy_l, makesmy
... y_l, makesmy warranty,expressor impUed, or _sumes my Iqd Uabi_y or raHp_m_U_yfor the _-mrncy, comple(me_ or mdak_eu otmy intormstkm, _us, product,or process disclosed, or represmlsIk_ iU use wouJd notintrinle privulelyownedrigk_ Reference kenin toanyspecific commercial products,process, or serviceby tradename,trademark,lumufactorer, or aduerwbe, does not mcessarily comUtute or imply Ksendonement, I_comm_ ortsvorin_ by the United Sbd. Government or the University d CaUforui8. The views and Olp_iom of _NLhon exprm_ herein do not necessarily state or reflect tboee o( tin Unitd $tatei Government or the University d Cdifomia, and did| na be usedfor Jvenisin8 or product endorsement purposes. ABSTRACT The Microwave Source Facility at the Lawrence Livermore National Laboratory (LLNL) is studying the application of induction accelerator technology to high-power microwave generators suitable for linear coUider power sources. We report on the results of two experiments, both using the Choppertron's 11.4 GHz modulator and a 5-MeV, 1-kA induction beam. The first experimental configuration has a single travelingwave output structure designed to produce in excess of 300 MW in a single fundamental waveguide. This output structure consists of 12 individual ceils, the first two incorporating de-Q-ing circuits to dampen higher order resonant modes. The second experiment studies the feasibility of enhancing beam to microwave power conversion by accelerating a modulated beam with induction cells. Referred to as the "Reacceleration Experiment," this experiment consists of three traveling-wave output structures designed to produce about 125 MW per output and two induction ceils located between the outputs. Status of current and planned experiments are presented.