Abstract
We summarize results from DIII-D in regard to issues for reactor application of H-mode. Recently, DIII-D has begun to operate a cryopump (D 2 pumping speed =31,000 l/s at a pressure of 2 mTorr). Initial results are very favorable for density control in H-mode. The plasma density could be reduced by 50%. Energy confinement is unchanged so the temperature rises in proportion to the density drop. Ability to access these less collisional plasmas in H-mode is favorable to current drive application. With the all-graphite wall, impurity accumulation has been eliminated. The exceedingly good confinement of VH-mode offers the possibility of retaining good confinement while radiating copious power from the plasma edge using injected noble gas impurities.
Original language | English |
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Article number | 036 |
Pages (from-to) | A249-A254 |
Journal | Plasma Physics and Controlled Fusion |
Volume | 36 |
Issue number | 7 A |
DOIs | |
State | Published - 1994 |
Externally published | Yes |