Spectral broadening measurement of the lower hybrid waves during long pulse operation in Tore Supra

2014 ◽  
Author(s):  
G. Berger-By ◽  
J. Decampy ◽  
G. Y. Antar ◽  
M. Goniche ◽  
A. Ekedahl ◽  
...  
Keyword(s):  
Lower Hybrid ◽  
Spectral Broadening ◽  
Pulse Operation ◽  
Hybrid Waves ◽  
Long Pulse ◽  
Lower Hybrid Waves

Ultra-long pulse operation using lower hybrid waves on the superconducting high field tokamak TRIAM-1M

1990 ◽  
Vol 30 (1) ◽  
pp. 47-57 ◽  
Author(s):  
S. Moriyama ◽  
Y. Nakamura ◽  
A. Nagao ◽  
E. Jotaki ◽  
K. Nakamura ◽  
...  
Keyword(s):  
High Field ◽  
Lower Hybrid ◽  
Pulse Operation ◽  
Hybrid Waves ◽  
Long Pulse ◽  
Lower Hybrid Waves

Frequency spectral broadening of lower hybrid waves in tokamak plasmas-causes and effects

1994 ◽  
Vol 34 (4) ◽  
pp. 469-481 ◽  
Author(s):  
V Pericoli-Ridolfini ◽  
L Giannone ◽  
R Bartiromo
Keyword(s):  
Lower Hybrid ◽  
Tokamak Plasmas ◽  
Spectral Broadening ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

scholarly journals Observation of Spectral Broadening of Lower Hybrid Waves in Alcator C-Mod

2012 ◽  
Vol 7 (0) ◽  
pp. 2402031-2402031 ◽  
Author(s):  
Seung-Gyou BAEK ◽  
Ronald R. PARKER ◽  
Cornwall LAU ◽  
Syun'ichi SHIRAIWA ◽  
Gregory M. WALLACE
Keyword(s):  
Lower Hybrid ◽  
Spectral Broadening ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

Spectral broadening of lower hybrid waves produced by parametric instability in current drive experiments of tokamak plasmas

2006 ◽  
Vol 46 (4) ◽  
pp. 462-476 ◽  
Author(s):  
R Cesario ◽  
A Cardinali ◽  
C Castaldo ◽  
F Paoletti ◽  
W Fundamenski ◽  
...  
Keyword(s):  
Parametric Instability ◽  
Current Drive ◽  
Lower Hybrid ◽  
Tokamak Plasmas ◽  
Spectral Broadening ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

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.

Effects of the spectral broadening of lower hybrid waves on current drive efficiency in the ASDEX tokamak

1992 ◽  
Vol 32 (2) ◽  
pp. 286-289 ◽  
Author(s):  
V Pericoli-Ridolfini ◽  
R Bartiromo ◽  
A.A Tuccillo ◽  
F Leuterer ◽  
F.-X Soldner ◽  
...  
Keyword(s):  
Current Drive ◽  
Lower Hybrid ◽  
Spectral Broadening ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

Spectral broadening of lower hybrid waves due to ponderomotive effects

1997 ◽  
Vol 230 (5-6) ◽  
pp. 336-346 ◽  
Author(s):  
C. Castaldo ◽  
E. Lazzaro ◽  
M. Lontano ◽  
A.M. Sergeev
Keyword(s):  
Lower Hybrid ◽  
Spectral Broadening ◽  
Hybrid Waves ◽  
Lower Hybrid Waves
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