Tests of a full-scale ITER toroidal interferometer and polarimeter (TIP) prototype on the DIII-D tokamak (invited)

被引：22

作者：

Van Zeeland, M. A. ^{[1
]}

Carlstrom, T. N. ^{[1
]}

Finkenthal, D. K. ^{[2
]}

Akiyama, T. ^{[3
]}

Boivin, R. L. ^{[1
]}

Colio, A. ^{[2
]}

Du, D. ^{[1
]}

Gattuso, A. ^{[1
]}

Glass, F. ^{[1
]}

Muscatello, C. M. ^{[1
]}

O'Neill, R. ^{[1
]}

Smiley, M. ^{[1
]}

Vasquez, J. ^{[1
]}

Watkins, M. ^{[1
]}

Brower, D. L. ^{[4
]}

Chen, J. ^{[4
]}

Ding, W. X. ^{[4
]}

Johnson, D. ^{[5
]}

Mauzey, P. ^{[1
]}

Perry, M. ^{[6
]}

Watts, C. ^{[7
]}

Wood, R. ^{[5
]}

机构：

[1] Gen Atom Co, POB 85608, San Diego, CA 92186 USA

[2] Palomar Sci Instruments, San Marcos, CA 92069 USA

[3] Natl Inst Fus Sci, Gifu 5095292, Japan

[4] Univ Calif Los Angeles, Dept Phys & Astronamy, Los Angeles, CA 90095 USA

[5] Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA

[6] Calif State Univ, San Marcos, CA 92096 USA

[7] ITER Org, F-13067 St Paul Les Durance, France

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2018年 / 89卷 / 10期

关键词：

DENSITY-MEASUREMENT; SYSTEM;

D O I：

10.1063/1.5037461

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A full-scale ITER toroidal interferometer and polarimeter (TIP) prototype, including an active feedback alignment system, has been installed and tested on the DIII-D tokamak. In the TIP prototype, a two-color interferometry measurement of line-integrated density is carried out at 10.59 mu m and 5.22 mu m using a CO2 and quantum cascade laser, respectively, while a separate polarimetry measurement of the plasma-induced Faraday effect is made at 10.59 mu m. The TIP prototype is equipped with a piezo tip/tilt stage active feedback alignment system that minimizes noise in the measurement and keeps the diagnostic aligned throughout DIII-D discharges. The measured phase resolution for the polarimeter and interferometer is 0.05 degrees (100 Hz bandwidth) and 1.9 degrees (1 kHz bandwidth), respectively. The corresponding line-integrated density resolution for the vibration-compensated interferometer is delta nL = 1.5 x 10(18) m(-2), and the magnetic field-weighted line-integrated density from the polarimeter is delta nBL = 1.5 x 10(19) Tm-2. Both interferometer and polarimeter measurements during DIII-D discharges compare well with the expectations based on calculations using Thomson scattering measured density profiles and magnetic equilibrium reconstructions. Additionally, larger bandwidth interferometer measurements show that the diagnostic is a sensitive monitor of core density fluctuations with demonstrated measurements of Alfven eigenmodes and tearing modes. Published by AIP Publishing.

引用

页数：9

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