Michigankickoff 11-10-99

8/9/2019 Michigankickoff 11-10-99

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University of Michigan

2UTL)#E

motivation

research to'ics

recent results

future 'lanne research


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U. Michigan Research To'ics

initial stuies have begun on a small scale3e4'ane 'rogram begins 5an. , 0---6

crosse 7el evices8 noise an moestability e4'eriments

theoretical research on intermoulation annoise in micro9ave tubes

micro9ave 'lasma cleaning: 'rocessing oftubes


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magnetron e4'eriments

beginning 9ith oven magnetrons 3mosteDcient sources "no9n6 e.g. Toshiba0M00, =--/-- C F *"V, -.>(

investigate noise an out/of/ban moegeneration 3source of EM 'ollution6

investigate moe ho''ing in startu'/

regime e4'lore the e4istence of Huiet/statesI

3C.;. !ro9n, ++ Raytheon Tech. Re'.6


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magnetron e4'eriments3continue6

utiliJe time/freHuency/analysis toe4amine the s'ectrum of magnetrons

investigate the connection of noise toe4cessI cathoe emission current

moeling of magnetron by Philli's Lab%cientists 3Luginslan an %'encer6


7/14University of Michigan

Micro9ave/tube relate theoryeKorts at U of Michigan

1) Intermodulation in klystrons and in TWTs(Work in progress)

2) Low re!uen"y emission noise rom

t#ermioni" "at#odes (s"aling law synt#esi$edor %i"ker noise power relati&e to s#ot noisepower)

') Low re!uen"y ion noise in linear beam tubes(many obser&ed eatures su"# as sensiti&ity to

*+eld to "at#ode &oltages et", e-plained bysimple t#eory,) .et#ods to redu"e t#is lowre!uen"y p#ase noise proposed,



theoretical research 3continue6

/, Time*re!uen"y analysis0 o&el te"#ni!uestudied or redu"tion o intereren"e in time*re!uen"y analysis o tubes t#at display mode

"ompetition, , Crossed*+eld*de&i"e output "#ara"teri$ation0

Time re!uen"y analysis being applied to &arious"rossed*+eld de&i"e output rom mi"rowa&eo&en magnetron to CFA3s, oise in "rossed*+eld

geometry "ontinues to be in&estigated, 4, Cat#ode pro"esses0 5ro"esses t#at a6e"t

"at#ode lie and "at#ode noise (e,g, "#anges inemission due to e&aporation and ionba"kbombardment) being analy$ed,



M);R2C(VE PL(%M(&)%;B(RGE ;LE(#)#G

can clean from the insie of tube

can match micro9ave freHuency to tube ty'e

no electroe im'urities ae to system

remote cleaning $ cleans non/symmetric 'arts

/ high ensity 'rocessing 'lasma 3 -E0/-e* :cc6 Vs. R1 'lasmas 3-E / -E- or );PN-E06

in 'rinci'le, no limitation to 'lasma columnlength, e'ens u'on the 'o9er ca'ability

ine4'ensive sources of "C 'o9er at 0.*@ GBJ


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)#)T)(L M);R2C(VE PL(%M( ;LE(#)#G %TU&)E%

Micro9ave resonant cavity

1i4e cavity insie iameter of =.+ cm

%liing short austs the length of the cavity toobtain s'eci7c electromagnetic moes 3*.@cm to .@ cm

Tuning stub , 9hich a''lies the micro9ave'o9er to the cavity, is 'lace very close to theglass tube containing the gas: 'lasma



L2C 1REQUE#;Y )2##2)%E )# TCT

Professor Y.Y. Lau

#uclear Engineering $

Raiological %ciences &e't.University of Michigan

(nn (rbor, M) *+-/0-*

)n collaboration 9ith &ave ;hernin anCally Manheimer uring sabbatical

in

i f li " i



( ;om'arison of 1lic"er #oisean %hot #oise on a Bot

;athoe

Professor Y.Y. Lau

#uclear Engineering $

Raiological %ciences &e't.University of Michigan

(nn (rbor, M) *+-/0-*

)n collaboration 9ith A. 5enson an !.Levush uring sabbatical in


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;2#;LU%)2#%

The University of Michigan 9illcontribute to the MUR)/ Program

in8 crosse/7el evice science

intermoulation an noise

tube 'rocessing techniHues

time/freHuency signal analysis

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Michigankickoff 11-10-99