MLM polychromator monitoring soft-x-ray spectral line emissions of C, O, and Fe used in transport studies of the Phaedrus-T tokamak plasma during ohmic, rf-heated, and H-mode discharges

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1146284· OSTI ID:6710985

Regan, S P; Finkenthal, M; May, M J; Moos, H W ^[1]

---

1. The Johns Hopkins University, Baltimore, Maryland 21218 (United States)

The MLM (multilayer mirror) polychromator has two modes of operation. In the first mode, it simultaneously monitors the Ly [alpha] and [beta] emissions of H-like O at 19.0 and 16.0 A, respectively, the Ly [alpha] emission of C at 33.7 A, and the singlet and triplet transitions of He-like C at 40.5 A. In the second mode, it simultaneously monitors the Ly [alpha] and [beta] emissions of H-like C at 33.7 and 28.5 A, respectively, as well as the 15.6 and 93.9 A emissions of F-like Fe. The MLM polychromator has a wavelength resolution that varies from 0.3 A at 16.0 A to 2 A at 40.5 A and 7 A at 93.9 A. It was mounted on the midplane of the Phaedrus-T tokamak with its line of sight along the major radius. On a shot by shot basis, the MLM polychromator, with a temporal resolution of 1 ms and a spatial resolution of 1 cm, scanned the plasma in the [ital z] direction [plus minus]15 cm from the toroidal magnetic axis. Vertical asymmetries in the soft x-ray spectral line brightness profiles were measured and found to depend on the direction of [ital B][sub [ital T]]. The brightness profiles were inverted and modeled with a poloidally asymmetric Gaussian emissivity profile. The measured results were compared with the predicted emissivity profiles to determine the transport of carbon.

• DOE Contract Number: FG02-86ER53214
• OSTI ID: 6710985
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 66:1; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
CARBON
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELEMENTS
EMISSION SPECTRA
IONIZING RADIATIONS
IRON
MAGNETIC MIRRORS
METALS
NONMETALS
OPEN PLASMA DEVICES
OXYGEN
PHAEDRUS MIRROR DEVICES
PLASMA DIAGNOSTICS
RADIATIONS
SOFT X RADIATION
SPECTRA
TANDEM MIRRORS
THERMONUCLEAR DEVICES
TRANSITION ELEMENTS
X RADIATION
X-RAY SPECTRA