Ion temperature and plasma rotation velocity measurements using visible spectroscopy on TdeV

1999 ◽  
Vol 70 (1) ◽  
pp. 387-390 ◽  
Author(s):  
I. Condrea ◽  
E. Haddad ◽  
B. C. Gregory ◽  
D. Lafrance ◽  
J. L. Lachambre ◽  
...  
Keyword(s):  
Rotation Velocity ◽  
Ion Temperature ◽  
Velocity Measurements ◽  
Visible Spectroscopy ◽  
Plasma Rotation

Measurements of radial profiles of the ion temperature and the plasma rotation velocity with the TFTR vertical x‐ray crystal spectrometer

1988 ◽  
Vol 59 (10) ◽  
pp. 2131-2134 ◽  
Author(s):  
M. Bitter ◽  
H. Hsuan ◽  
J. E. Rice ◽  
K. W. Hill ◽  
M. Diesso ◽  
...  
Keyword(s):  
Rotation Velocity ◽  
Ion Temperature ◽  
Crystal Spectrometer ◽  
Plasma Rotation ◽  
X Ray ◽  
Radial Profiles

The ITB dynamics controlled by internal kink modes on HL-2A tokamak

2021 ◽  
Author(s):  
Xiaoxue He ◽  
Longwen Yan ◽  
Deliang Yu ◽  
Wei Chen ◽  
Liming Yu ◽  
...  
Keyword(s):  
High Performance ◽  
Fusion Reactor ◽  
Rotation Velocity ◽  
Plasma Current ◽  
Ion Temperature ◽  
Lower Plasma ◽  
Transport Barriers ◽  
Internal Transport Barriers ◽  
Foot Position ◽  
Internal Transport

Abstract The active control of internal transport barriers (ITBs) is an important issue to achieve high performance plasma in a fusion reactor. A critical challenge of ITB control is to increase the ITB position. The ITBs with internal kink modes (IKMs), such as fishbone instability and long-live mode (LLM) with mode number of m/n = 1/1 are frequently observed on HL-2A tokamak in neutral beam heated discharges. The correlation of fishbone instability/LLM with ITBs is analyzed in order to extend the ITB radius. It has been revealed that fishbone instability and LLM are often excited after the ITB formation. Therefore, fishbone instability and LLM play no role in triggering ITBs on HL-2A tokamak. On the other hand, they may slow down the outward radial expansion and then shrink the foot position of ITB, and damp the gradient growth of ion temperature and rotation velocity. Since the perturbation of LLM is weaker than that of fishbone instability, the shrinking effect of ITB foot and braking effect on gradient growth are slighter than those of fishbone instability. Compared with the LLM, fishbone instability routinely appears in plasmas with lower density, higher heating power and lower plasma current. In addition, large ITBs without IKMs are also discussed on HL-2A tokamak. The large ITB is the largest one, the fishbone ITB is the strongest one and the LLM ITB is the widest one in three ITBs, where the ‘large’, ‘strong’ and ‘wide’ qualifications correspond to ITB position ρITB, the normalized temperature gradient R/LT, and its width W/a. Therefore, the large ITB position may be obtained if the IKMs are effectively controlled in a tokamak.

scholarly journals Poloidal Rotation and Edge Ion Temperature Measurements Using Spectroscopy Diagnostic on Aditya-U Tokamak

Atoms ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 93
Author(s):  
Gaurav Shukla ◽  
Malay B. Chowdhuri ◽  
Kajal Shah ◽  
Nandini Yadava ◽  
Ranjana Manchanda ◽  
...  
Keyword(s):  
High Resolution ◽  
Line Emission ◽  
Rotation Velocity ◽  
Spectral Lines ◽  
Tokamak Plasma ◽  
Vacuum Vessel ◽  
Ion Temperature ◽  
Minor Radius ◽  
Impurity Ion ◽  
Poloidal Rotation

The impurity ion poloidal rotation and ion temperature from the Aditya-U tokamak plasma have been measured using a high-resolution spectroscopic diagnostic. It comprises of a high resolution, 1 m, f/8.7, Czerny-Turner configuration spectrometer along with charge coupled device (CCD) detector. The system monitors the spectral line emission of C2+ impurity ions at 464.74 nm from the top port of the Aditya-U vacuum vessel with the lines of sight covering the plasma minor radius from r = 11.55 cm to 21.55 cm. The impurity ion poloidal rotation velocity and temperature have been estimated using the Doppler shift and Doppler broadening of the spectral lines respectively. The maximum poloidal rotation at a radial location of 21.55 cm in the edge of the plasma during the plasma current flat top was observed to be ~4 km/s for the analyzed discharges and the ion temperatures measured in the edge were in the range of 32–40 eV.

Impurity ion temperature and toroidal rotation velocity in JET from high‐resolution x‐ray and XUV spectroscopy

1988 ◽  
Vol 64 (7) ◽  
pp. 3345-3352 ◽  
Author(s):  
M. Mattioli ◽  
J. Ramette ◽  
B. Saoutic ◽  
B. Denne ◽  
E. Källne ◽  
...  
Keyword(s):  
High Resolution ◽  
Rotation Velocity ◽  
Ion Temperature ◽  
X Ray ◽  
Toroidal Rotation ◽  
Xuv Spectroscopy ◽  
Impurity Ion

Characteristic peaked profiles of ion temperature and toroidal rotation velocity in JT-60 hot ion modes

1993 ◽  
Vol 33 (2) ◽  
pp. 251-261 ◽  
Author(s):  
Y Koide ◽  
S Ishida ◽  
A Sakasai ◽  
H Shirai ◽  
T Hirayama ◽  
...  
Keyword(s):  
Rotation Velocity ◽  
Ion Temperature ◽  
Toroidal Rotation

scholarly journals Main-ion temperature and plasma rotation measurements based on scattering of electron cyclotron heating waves in ASDEX Upgrade

2017 ◽  
Vol 59 (7) ◽  
pp. 075009 ◽  
Author(s):  
M Stejner ◽  
J Rasmussen ◽  
S K Nielsen ◽  
A S Jacobsen ◽  
S B Korsholm ◽  
...  
Keyword(s):  
Electron Cyclotron ◽  
Electron Cyclotron Heating ◽  
Ion Temperature ◽  
Plasma Rotation
Sign in / Sign up

Export Citation Format

Share Document