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9. ACQUTTIC tftvi anncEfl
Tht obj*cUv« of this aw project i« to imrotifBt« tto proptrtUt
of »l roMV* «rowAtir wv« trftn*4u<*cr« 1A order to l^wim tfeotr MB*
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This !• ;^rt«r:jr Otmiu» Report le. 11, for th# period of 1 l^gr
thro^|& 31 JuJjr 19^. Thl« report dMcrlbet projects eetlve la tho
third yeer of tfcfti rootrert.
At •».• pr»»«nt -..■o ttere ere ft*» project«, e« follow«:
1. Ceetipede ^T
2. Cst«aled-later%ct!jn Cjr«tron«
). Trer^vvr*e-«ev« 9\jd!««
%. ivfte-f.Aaao Sleilo«
9. Adoyotlr Iteve U»v: n«
T>* ^•«.••'-t» ist.ed *ar:;^t:ar. iHi^pr^«!«« *» TVr*»" Ofa« 'Ion-
{*r,.e&: Moleetrtc*;te«« TVT* äev« tcec caapl«t«4. %o «ork he« i»»r.
4aw m im *^rtoitr Circuit SteHr»* prc.*e-*> äorln« thi« f>Art#r.
* 4eecri|M'.ar ef tue vor« iob* ur. \t*— i^«,*»-t» durli^i thla ror.T«-*
l«er etli t>e pre«eet«i te tee forw^«»:^ Anr.««. K^yert.
A te«e • ••{.»••. *rt* •• «Art« ••»•• !r. aj A'c«.*r«*»4 l%re..#:>
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Cim\m ■ .*mm' «M iQBp «let Mi « TV«*!««; SfertfMefter? itpm I or ti«
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StMURY AMD AHALYBIS OF TKS VOMC
i. mriPKLK ivr
it. K. Vlntlow,* T. Reeder)
A. UnROOUCTIQi
The ofcjectiv« of tÄit project !• to «tudy the electron beaa - slow
w«ve circuit Intermctlo« In e hl^h-pt^er tr*vellng-w«fe tube. The centi-
pede «low wmve circuit, • coupled cavity «trueture, U tied In this study.
In particular, the «rntlpede has been choten because It has proven to be
on« of the »st satisfactory slow wave structures for a high-power TVT.
^e »thud of Investigation will be to a^asure the aa^lltude and phaae of
the field« In each «»ntlpede cavity while the centipede la mour.ted on the
•lectro« slick and Is being operated ss a TVT. Msasureaenta ov-r t par-
ticular reglor. are possible, such as ••. a sever and In the output section
of the tube. The results of this study will be of utaosl value In
-p^.lali'.r.g the ear./ paraatters afftrctlng the beaa-clrcult Interactlofi.
». DlSCJBBIGi
71.9 flalds Inside each centipede cavity are saapled by a saall, Movable
loof probe which Is coupled to the fields by saall slots located between
the feet of adjacent cartlpede loops, as shown In fig. 1. The probe can
be «rred over V>e entire length of the centipede structure, and It can be
precisely positioned Tver • particular cavity slot. The slxe of the slots
«a« adjusted v pr -»'.le at Tut *ie-ter.th of a allllwatt of probe output
kilowatt Is applied at the centipede Input coupler. The asiplltude
Pr >-•. sup«rvls r
On« eantlptdft f On« periodic cavity / ••etion
vvvvvv ftrob« XrmX |J ^-Loop probe
\ Coupllag slots
To probe aeMureBMit apparetüa
FID. 1—Crots-sectlooel view of the centipede structure shoving field probe end coupling slot location.
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r»-.» »tov« «q^Atloe« txmv t««n use4 to cclcuiat* circuit loas for
•««•r%i Tttl-^»« of 0 Th« ecn«*.«r.*.» h«ve beer, choeen to afttch the
fWMUarr.t^: »04 loop b«nd dltperiior. of the orntlpede structure which has
t««r. studied osparlaeew^. /. ^ete constants are
f - 3.200 Oc
■ k ■ 0.3266
7t* fr^jBMy cutoff« of the fundaarnta; passtand are
f, - 2.310 0c
f • 3-200 3c u
ft^are $ «aovs the results ->f the l->st calculations for D ■ 0 , 0.025
aad ;.J^C. It has t>e«n poeslbie to show that If D • 0.0^07 , the
9%IraUted ; 5#s of the «fulealent circuit Is In good agreeaset with the
eap«r'.e»r;ta.^ «»asire-i loss af ths eertlpeie. figure *• coo^ares this
«mlculatloe vltt. the esperlas^tal data.
tork Is cortlRulag or. a smll-slgnal theory for the ckntlpede which
laciaAas the effect of two circuit vavss and tec beaa waves. Circuit loss
Is taeltfied la this theory la the mrxer described in this report. Thus
f*r, • e-elfter prograa ^.a* been written to calculate the propaget' ^n
•»starts of the fctf waves prcviuced by the t^aa-clrcuit coupling. Another
?v «raa Is being levlsed to calculate aaplltude «r.d phase In each centipede
-a*:*./ A rce^lete report on both the experlaental and the theoretical
Mrk it this project Is being written and will be avellable later.
2. BCTBNDED-IlimACTIGi KLYSTOOHS
(N. Chodorcv,* B. KUUM)
A. iU'lVUUUCriON
The primary purpoM of this project it to invtstiost« th«
galn-bandwldth product and converaloo efficiency nhich can be aehiered
In an extended-interaction klystron, with carities consisting of resonated
sections of a alow-wave structure. The current phase of this work is the
evaluation, by aeans of the electron stick, of a three-cavity L-band tube.
In this device, broadband modulation of the electron bean is simulated with
Input and Intermediate cavities containing tunable reaonated sections of
a ring-bar structure. The length of the output cavity can be changed, in
half-wavelength Increments, fron one to five resonant half-wavelengths of
Its component ring-bar structure, and the loading can be adjusted by chang-
ing the terminal conditions on the couplers attached to both ends of the
output resonator.
The tube is better suited for bean-testing on tLe electron stick than
the earlier 8-band model, because the L-band device has higher interaction •
lavedance on the bean axis and can operate at lower bean voltages, thus
facilitating the suppression of parasitic oscillations on the electron
stick. Bean tests of the L-band tube are in progress.
B. OTABiuTr oamnmmnm
In Quarterly Report lo. 9 (*. L. Report lo. IIU3), a now arthod «as described by which one would suppress parasitic oscillations on the electron stick by covering the en-Ire stick with a thin sheet of directionally re- sistive «vier. This approach has been quite satisfactory in that no stick oscillations were observed up to 30 W, the highest bean voltage of interest. Tests at higher bean voltages will not be done until after co^iletioo of the main experiment, since, in caae of breakdown, the resistive film is liable to destruction due to arcing from the glass tube. During trial
■ Project supervisor.
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