scholarly journals Study of lower hybrid current drive towards long-pulse operation with high performance in EAST

2015 ◽  
Author(s):  
Keyword(s):  
High Performance ◽  
Current Drive ◽  
Lower Hybrid ◽  
Pulse Operation ◽  
Lower Hybrid Current Drive ◽  
Long Pulse

scholarly journals Lower hybrid current drive experiments in support of high confinement long pulse operation in EAST

2017 ◽  
Vol 157 ◽  
pp. 03011 ◽  
Author(s):  
Annika Ekedahl ◽  
Bojiang Ding ◽  
Xianzu Gong ◽  
Marc Goniche ◽  
Miaohui Li ◽  
...  
Keyword(s):  
Current Drive ◽  
Lower Hybrid ◽  
Pulse Operation ◽  
Lower Hybrid Current Drive ◽  
Long Pulse

scholarly journals Advances in Lower Hybrid Current Drive for Tokamak Long Pulse Operation: Technology and Physics

2012 ◽  
Vol 7 (0) ◽  
pp. 2502140-2502140 ◽  
Author(s):  
Gia Tuong HOANG ◽  
Léna DELPECH ◽  
Annika EKEDAHL ◽  
Young-soon BAE ◽  
Joelle ACHARD ◽  
...  
Keyword(s):  
Current Drive ◽  
Lower Hybrid ◽  
Pulse Operation ◽  
Lower Hybrid Current Drive ◽  
Long Pulse

Steady state long pulse tokamak operation using Lower Hybrid Current Drive

2011 ◽  
Vol 86 (6-8) ◽  
pp. 490-496 ◽  
Author(s):  
A. Bécoulet ◽  
G.T. Hoang ◽  
J.F. Artaud ◽  
Y.S. Bae ◽  
J. Belo ◽  
...  
Keyword(s):  
Steady State ◽  
Current Drive ◽  
Lower Hybrid ◽  
Lower Hybrid Current Drive ◽  
Long Pulse

Current drive experiments in SST1 tokamak with lower hybrid waves

2021 ◽  
Author(s):  
P K Sharma ◽  
D Raju ◽  
Surya Kumar Pathak ◽  
R Srinivasan ◽  
Kiran Ambulkar ◽  
...  
Keyword(s):  
Electron Cyclotron Resonance ◽  
Current Drive ◽  
Lower Hybrid ◽  
X Rays ◽  
Minor Radius ◽  
Lower Hybrid Current Drive ◽  
Hybrid Waves ◽  
Long Pulse ◽  
Start Ups ◽  
Lower Hybrid Waves

Abstract The steadystate superconducting tokamak (SST1) is aimed to demonstrate long pulse plasma discharges employing non-inductive current drive by means of lower hybrid current drive (LHCD) system. The major and minor radius of the machine is 1.1m and 0.2m respectively. The LHCD system for SST1 comprises of klystrons, each rated for 0.5MW-CW rf power at a frequency of 3.7 GHz. The grill antenna comprises of two rows, each row accommodating 32 waveguide elements. Electron cyclotron resonance (ECR) breakdown assisted Ohmic plasma is formed in SST1 to overcome the issues associated with low loop voltage start-ups. With recent modifications in the poloidal coils configuration, even with narrow EC pulse (~50ms), good repeatable and consistent Ohmic plasmas could be produced which helped in carrying out LHCD current drive experiments on SST1. These experiments demonstrated both fully as well as partially driven non-inductive plasma current in SST1 tokamak. Discharges with zero loop voltages were obtained. The interaction of lower hybrid waves with plasma and generation of suprathermal electrons could be established using energy spectra measured by CdTe detectors. Various other signatures like drop in loop voltages, negative loop voltages, spikes in hard x-rays and increase in 2nd harmonic ECE signal, further confirmed the current drive by LHW’s. The beneficial effect of LHW’s in suppressing hard x-rays was also demonstrated in these experiments. The non-inductive current drive in SST1 could also be established by modulating LH power. The longest discharge of ~650ms could be obtained in SST1 with the help of LHW’s. In this paper, the experimental results obtained with LHCD experiments on SST1 is reported and discussed in more details.

Study on lower hybrid current drive efficiency at high density towards long-pulse regimes in Experimental Advanced Superconducting Tokamak

2014 ◽  
Vol 21 (6) ◽  
pp. 062510 ◽  
Author(s):  
M. H. Li ◽  
B. J. Ding ◽  
J. Z. Zhang ◽  
K. F. Gan ◽  
H. Q. Wang ◽  
...  
Keyword(s):  
Current Drive ◽  
High Density ◽  
Lower Hybrid ◽  
Lower Hybrid Current Drive ◽  
Long Pulse ◽  
Superconducting Tokamak

The Alcator C-Mod lower hybrid current drive experiment transmitter

2005 ◽  
Vol 74 (1-4) ◽  
pp. 495-499 ◽  
Author(s):  
M. Grimes ◽  
D. Terry ◽  
R. Parker ◽  
D. Beals ◽  
J. Irby ◽  
...  
Keyword(s):  
Current Drive ◽  
Lower Hybrid ◽  
Lower Hybrid Current Drive
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