Particle control in the DIII-D advanced divertor

Conference · Fri Nov 01 04:00:00 EST 1991

DOI:https://doi.org/10.1109/FUSION.1991.218919· OSTI ID:6254350

Schaffer, M J; Lippmann, S I; Mahdavi, M A; Petrie, T W; Stambaugh, R D ^[1]; Hogan, J; Klepper, C C; Mioduszewski, P; Owen, L ^[2]; Hill, D N; Rensink, M ^[3]; Buchenauer, D ^[4]

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1. General Atomics, San Diego, CA (United States)
2. Oak Ridge National Lab., TN (United States)
3. Lawrence Livermore National Lab., CA (United States)
4. Sandia National Labs., Livermore, CA (United States)

A new, electrically biasable, semi-closed divertor was installed and operated in the D3-D lower outside divertor location. The semi-closed divertor has yielded static gas pressure buildups in the pumping plenum in excess of 10 mtorr. (The planned cryogenic pumping is not yet installed). Electrical bias controls the distribution of particle recycle between the inner and outer divertors by {rvec E} {times} {rvec B} drifts. Depending on sign, bias increases or decreases the plenum gas pressure. Bias greatly reduce the sensitivity of plenum pressure to separatrix position. In particular, {rvec E} {times} {rvec B} drifts in the D3-D geometry can direct plasma across a divertor target and then optimally into the pumping aperture. Bias, even without active pumping, has also demonstrated a limited control of ELMing H-mode plasma density. 5 refs., 8 figs.

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC03-89ER51114; AC05-84OR21400; W-7405-ENG-48; AC04-76DP00789
• OSTI ID: 6254350
• Report Number(s): GA-A-20631; CONF-910968--46; ON: DE92003620
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700420* -- Fusion Technology-- Plasma-Facing Components-- (1992-)
BOUNDARY LAYERS
CLOSED PLASMA DEVICES
CONFINEMENT
CONTROL
CRYOPUMPS
DIVERTORS
DOUBLET-3 DEVICE
EQUIPMENT
H-MODE PLASMA CONFINEMENT
IMPURITIES
LABORATORY EQUIPMENT
LAYERS
PARTICLE LOSSES
PLASMA CONFINEMENT
PLASMA IMPURITIES
PLASMA SCRAPE-OFF LAYER
PUMPING
PUMPS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VACUUM PUMPS