X-Band Klystron Developmentfor JLC

KEK

Yong Ho Chin

ISG5SLAC

February 22-25, 2000

Toshiba PPM-1

% Main emphasis

l Test a newly designed gunl Establish the know-how for

+ Design and manufacturing of PPM circuit+ Measurement method of magnetic fields+ Damping of higher-order modes+ Brazing of SUS and Monel used for tubes and

cavities

4 Design goal

a Present Status

l Design completed and now in manufacturingl The expected performance (according to MAGIC

simulation)

+ Peak power at 480kV >70MW+ Efficiency r 55%+ Pulse length > 1.5~s

l The theoretical analysis for oscillation shows thatthe potentially dangerous modes are damped byeither output couplers or lossy tubes and cavities.

l Features+ Gun

.f Tunable beam size between 2.3mm -3.3mm3 Hot dimension was estimated by the

thermal code ANSIS+ Beam-cavity interaction region

2 RF current 2 1.7~1 All cavities (except the output cavity (Cu))

are made of Monel.i All tubes are made of stain-less steel3 Output cavity with two output couplers

apart by 150 degree to damp some dipolemodes

0N

Time 13.980 ns: PHASESPACE for all particles

PHASESPACE Plot 1Remarks: Fine Mesh to z 24mm. Ideal Pierce Gun

Device: T ppm X band klystroRun No: *

Mag Larionov/ 3900AT /3OOA, Bc 14.5Gs. File: Tx.mgcAuthor: S.M.Organization: KEK

MAGIC2D Version: March 1999 Date: Sep 02,1999 Time: 13:04 Page: 16

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Cavity Data of KEK PPM # 1 Klystron

Cavity l(inp) 2 3 4 5 6Position,mm 228 318 393 543 603 633Gap,- 3.6 3.6 6 4.8 7.2 5.8WQgap,Ohm 46 33 55 37 55 36IUQaxis,Ohm 89 73 123 110 121 132QC~WER 4780 4320 6220 5520 4950QMONEL

6300907 820 1180 1050 940 1200

Vgap,MAGIc,kV 0.7 10.7 72 145 127 266 200Vgap,DAh4PER 0.7 10.0 70.8 132 119 237 200DamperConduc. - 0.032 0.039 0.034 0.026 0.Esurf,kV/cm - - - 360 270 610 460P, W/lOOpps - - - 40 23 123 70*m O? -40 50 250 350 350 450F2~~110,MJdz 15880 15211 15920 15590 15818 15884,F31x111 18662 18666 17577 17120 16925 16614Coupling Mode I- 18675-----ITrape Mode 1 I------- 18526 ----ITrape Mode2 I 18594 __________ 1Trape Mode3 Ia-_----- 188(&w- ______________ 1

Trape Mode4 IB--------m1 gg77- --------------- 1Trape Mode5 I---------- -1g10’2- --------------- 1Trape Mode6 I----------- ----- +gg ----- - --------------------- 1Output System Traped Mode, MHz:HFSS Qfactor MAXWELL RFBEAM Fbeam,MHz---s---w---- Azimuth Symmetry Modes--------------------------------9780 200 9767 no problem- - 11001 no problem- - 12140 no problem

12690 180 12752 no problem1 9 7 4 0 1 3 0 0 1 9 6 0 9 n o p r o b l e m21400. ..126 21414 unstable about40OkV Q?=lOOOO 21500m - i -., --- - - - D i p o l e M&s, m=l-:- . ‘.iO950 .?200.0. ‘:.‘ 10918 i :. :

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unstable V>300-4OOkV; .&lOOO 15810

16670 2‘10 ‘.S&&*1& Modes m=3:

20930 >500 ’ *17400 go0 . . 21780 >500 ,.19120. 530 : < 2 2 6 8 0 >50020540 ~100

I ZMIN= 618,88 ZMAX= 714.88 RUIN= .80 RMAX= 78,79 FILE:OUT3Z= 618,88 R= a88 MODE NUMB= 12 CURRENT NODE= 8 FMODE= 15784.21MH2

READ FILEMODE NUMBERNORMALIZEGAUSS NUMBERST-STEP FIELDWINDOWSURFACELINEAREA FIELDD-NODE FIELDE-FIELD LINEH-FIELD LINEPOINT FIELDSFORCE LINECLEARQUITt - HOWDIALOGUE ED:ESC \ END

Dipole mode in Output System. F=15784 MHz r=O...4mm

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Sl to s2

- 120gr,Q =???- lGOgr,Q =210__ 170gr,Q =420- 18Ogr,Q=630--~-- 15Ogr,Q =llO

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GHz

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- 120gr,Q =???- 160gr,Q =200-- 170gr,Q =420- 180gr,Q=630

- 150gr,Q=llO

Q-factor 10.9GHz mode

2500

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Voltage Threshold of Generations of ‘PPM#Z Klystron(Zp;naig sign of Interaction Power. Thin Beam Model

simufatrons 25/l l/99MAXWELL Cavity Cakulations File&CAVm, CAV4POISSON PPM Calculations File: OUTSFl 00

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* IIIiiii

Toshiba PPM-2

II Design goal

l Manufacturing of a PPM klystron that meets thespecs of JLC

l Overhaul of design and manufacturing process forfuture mass production

l Toshiba PPM-2 will be ordered in Summer 2000after its design will be adjusted according totesting results of Toshiba PPM-2

l High power testing is scheduled to start fromSpring 2001.

I Main changes from Toshiba PPM-1l Water cooling for a higher repetition ratel Clamp-on PPM for future mass productionl A new high power Kazakov windowl A new modulator for a higher repletion rate

(150Hz) and a longer pulse (3~s)