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Electric field divertor plasma pump

Patent ·
OSTI ID:869531
 [1]
  1. San Diego, CA
+ Show Author Affiliations
An electric field plasma pump includes a toroidal ring bias electrode (56) positioned near the divertor strike point of a poloidal divertor of a tokamak (20), or similar plasma-confining apparatus. For optimum plasma pumping, the separatrix (40) of the poloidal divertor contacts the ring electrode (56), which then also acts as a divertor plate. A plenum (54) or other duct near the electrode (56) includes an entrance aperture open to receive electrically-driven plasma. The electrode (56) is insulated laterally with insulators (63,64), one of which (64) is positioned opposite the electrode at the entrance aperture. An electric field E is established between the ring electrode (56) and a vacuum vessel wall (22), with the polarity of the bias applied to the electrode being relative to the vessel wall selected such that the resultant electric field E interacts with the magnetic field B already existing in the tokamak to create an E.times.B/B.sup.2 drift velocity that drives plasma into the entrance aperture. The pumped plasma flow into the entrance aperture is insensitive to variations, intentional or otherwise, of the pump and divertor geometry. Pressure buildups in the plenum or duct connected to the entrance aperture in excess of 10 mtorr are achievable.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Organization:
USDOE
DOE Contract Number:
AC03-89ER51114; AC05-84OR21400; W-7405-ENG-48; AC04-76DP00789
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Number(s):
US 5353314
OSTI ID:
869531
Country of Publication:
United States
Language:
English

References (6)

Experimental demonstration of E×B plasma divertor journal January 1978
Tokamak devices journal March 1972
Poloidal divertor experiment with applied E⃗×B⃗ /B 2 drift journal August 1981
Plasma behavior with a separatrix magnetic surface in JFT−2a tokamak journal January 1976
The H-Mode of ASDEX journal November 1989
Tokamak research journal June 1975

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Related Subjects

/376/
10
20
22
40
54
56
63
64
achievable
aperture
apparatus
applied
bias
bias applied
buildups
connected
contacts
create
divertor
drift
drift velocity
drives
duct
duct connected
electric
electric field
electrically-driven
electrode
entrance
established
excess
existing
field
flow
geometry
insensitive
insulated
insulators
intentional
interacts
laterally
magnetic
magnetic field
mtorr
near
opposite
optimum
otherwise
plasma
plasma pump
plasma-confining
plate
plenum
polarity
poloidal
poloidal divertor
positioned
positioned near
positioned opposite
pressure
pressure buildup
pump
pumped
pumping
receive
receive electrical
relative
resultant
selected
separatrix
similar
strike
times
tokamak
toroidal
vacuum
vacuum vessel
variations
velocity
vessel
vessel wall
wall