Vacuum system for the Tandem Mirror Experiment Page: 5 of 5
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on* 12-inoh D.P. on th* Mat-plu” -ank. Th*
diffusion puapa art baoktd by Root* Movers and
meohanloal puapa. LHj trap* have beau loo a tad
upstream fro* aaoh D.P, a* wall aa between tha Root*
blower* and th* aaohanloal puapa.
High spaad puaplng of th* nautral baaa gas that
ia not trapped, and of tha plasaa that aaoapaa
confinement la don* by titanlua aurfaoa pumping.
Tha Utj ooolad aurfaoa* anhano* tha atlofcing
aoafflolant (£) of tha titanlua aurfaoa. Walla at
rooa taaparatura hava an **0.03 and walla at 02K
have an dC*0.20. This give* TTff a total pumping
apead of about 50x10° 1/a.
Figure 6 thowa th* r*suit* of dividing th* plug
tanka into difarantial puaplng raglona with th* Lkg
1ST INJECTOR REGION
•2ND INJECTOR REGION
PLUG COIL REGION
PLASMA END DUMP REGION
Fig. 6 Tranaiant Praaaur* His* Without Puaplng
liners. Tha tranaiant praaaur* rlaaa war* aaaaurad
when on* puls* fro* a nautral baaa aouro* waa
injected for a period of 60 aa. Tha daalrad raeulta
of keeping as auch gas as possible in th* first and
second injector regions Is shown.
Figure 7 shows the results of tha change in
(1) Pressure response with ware liners and without
fraah getterlng. Baaa pressure 2.0 X 10-7 Torr.
(2) Pressure response with wara liners and with fresh
getterlng. Baa* pressure 2.0 X 10-7 Torr.
(3) Praaaur* response with cold liners and without
fresh getterlng. Baae pressure 3.9 X 10-8.
(4) Pressure response with oold llnera and with freah
getterlng. Base pressure 3.9 X 10“® Torr.
Fig. 7 Transient Pressure Response in tha
First Injeotor Region for a Qas Load
of 240 Torr 1/a For 50 aa
and prsasura aaaauraaanta war* aad* in th* first
injeotor region (Figs. 3 * 4) with a faat ion gauge.
Tha graph show* tha increased puaplng apeed for the
L*2 oooled walla.
The TMX vaouua ayatea perfora* approximately aa
exp*0tad according to th* initial daslgn. Tha design
waa baaed on equilibriua-preaaur* calculations with
only arud* eatla*tea of th* transient praaaurea. In
tha near future a mathematical aodel will ba
developed to predict tranaiant praaauras in th*
differential puaplng regions of TMX and tha results
will be ooapared with data taken froa TMX. We hope a
aodel osu be developed that will account Tor puaplng
don* by th* plasaa and give a better understanding of
the vaouua ayatea'a response during plasaa physics
experiments. A batter understanding of th* vaouua
ay*tea will be a strong aid for designing future
upgrade* of th* TMX experiment.
Tha author* would Ilka to ackncwladga the
following people for their contributions to this
projeot: Q.A. Dels and R.P. Drake.
1. D.P, Atkinson! "Vaouua System for the Tandea
Mirror Ixperlaent," in Prop. 7th Syap,
Inglnaerina Problaas of Fusion Rtatarch.
Knoxville, TO (1977)
2. F.H. Coenagent TMX Major Proposal. Lawrenoe
Llvaraore Laboratory, Llveraora, CA.,
3. C.J, Anderson and V.O. Flnlayaon, "Operating
Charaoterlatioa of a 051 Ti 151 Ta Alloy (letter
Wire," J, Vao. Sol. Taohnol. 7. (1970)
“Work performed under the tuipice* of the
U.S. Dfp*rtment or Entfjy by the Liwience
Livermore Libor*lory under contract number
"Thia report w« p«p*r*d as an account
Jpoowred by lie Uni tad Siataa Oavi
Netthar the Uruiad Stata* nor Um Unit*
DapartMM of Eaariy, nor any of tMr employe**,
»or my of ihjir coorractofi, aubcootracton, or
Uni tad Sutaa
aw my of tbcV coatracton, aubcootri
tfcair wwlom makM aay warranty, exj
imptiad, or mhm aay Waal fabiKty or
aibility for tkt accuracy, complatan
uaafuhni of any information, appartnu, prodi
or procaa* dfectoMd, or rapraaanU that it* i
woaid not inMatt priv#t*Jy-ow*#d rfcfcu."
Reference lo a company or product
name does not imply approval or
recommendation of the product by
the University of California or the
U.S. Department of Energy to the
excluiion of others that may be
praaaur* vs time for different titanium aurfao*
pumping situtations. Gaa pulses from eight neutral
baaa sources ware injected into the east-plug tank
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Richardson, M.J.; Atkinson, D.P. & Calderon, M.O. Vacuum system for the Tandem Mirror Experiment, article, November 9, 1979; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1085771/m1/5/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.