Joint European Torus results with both fast and lower-hybrid wave consequences for future devices

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860483· OSTI ID:7182320

Jacquinot, J; Bures, M ^[1]

---

1. JET Joint Undertaking, Abingdon, Oxon OX14 3EA (United Kingdom)

Heating and current drive studies were performed during the JET (Phys Fluids B {bold 3}, 2209 (1991)) 1990/91 operation using two large systems capable of generating either fast waves in the ion cyclotron range of frequencies (ICRF) or slow waves at a frequency above the lower-hybrid resonance (LH). The maximum wave power coupled to the torus reached 22 MW for ICRH and 2.4 MW for LH. The results obtained in plasma heating experiments qualify ICRH as a prime candidate for heating reactor grade plasmas. A centrally localized deposition profile in the cyclotron damping regime was demonstrated in a wide range of plasma density resulting in (i) record value {ital n}{sub {ital d}} {tau}{sub {ital E}} {ital T}{sub {ital i}0} {congruent} 7.8 {times} 10{sup 20} m{sup {minus}3} sec keV in thermal'' conditions {ital T}{sub {ital i}} = {ital T}{sub {ital e}} {congruent} 11 keV at high central densities generated by pellet injection; (ii) large normalized confinement 2.5 {le} {tau}{sub {ital E}}/{tau}{sub Goldston}{le}4. The large values of {tau}{sub {ital E}}/{tau}{sub Goldston} are reached in H-mode discharges ({ital I}{le}1.5 MA) with large bootstrap current fraction {ital I}{sub BS}/{ital I} {le} 0.7 {plus minus} 0.2; (iii) the highest to date D--{sup 3}He fusion power (140 kW) generated with 10--14 MW of ICRH in the L-mode regime at the {sup 3}He cyclotron frequency. All specific impurity generations have been reduced to negligible levels by proper antenna design and the generic difficulty of wave--plasma coupling has been greatly reduced using feedback loops controlling in real time the antenna circuits and the plasma position.

• OSTI ID: 7182320
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 4:7; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310 -- Plasma Confinement-- (1992-)
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
CLOSED PLASMA DEVICES
CURRENT-DRIVE HEATING
ELECTRIC HEATING
ELECTROMAGNETIC RADIATION
HEATING
HIGH-FREQUENCY HEATING
JET TOKAMAK
JOULE HEATING
LOWER HYBRID HEATING
MICROWAVE RADIATION
PLASMA HEATING
RADIATIONS
RADIOWAVE RADIATION
RESISTANCE HEATING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES