Suprathermal electron studies in the TCV tokamak: Design of a tomographic hard-x-ray spectrometer

Journal Article · Wed Oct 15 04:00:00 EDT 2008 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2957843· OSTI ID:21266658

Gnesin, S; Coda, S ^[1]; Decker, J; Peysson, Y ^[2]

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1. Association Euratom-Confederation Suisse, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland)
2. Association Euratom-CEA, CCEA/DSM/IRFM, CEA Cadarache, 13108 St Paul lez Durance (France)

Electron cyclotron resonance heating and electron cyclotron current drive, disruptive events, and sawtooth activity are all known to produce suprathermal electrons in fusion devices, motivating increasingly detailed studies of the generation and dynamics of this suprathermal population. Measurements have been performed in the past years in the tokamak a configuration variable (TCV) tokamak using a single pinhole hard-x-ray (HXR) camera and electron-cyclotron-emission radiometers, leading, in particular, to the identification of the crucial role of spatial transport in the physics of ECCD. The observation of a poloidal asymmetry in the emitted suprathermal bremsstrahlung radiation motivates the design of a proposed new tomographic HXR spectrometer reported in this paper. The design, which is based on a compact modified Soller collimator concept, is being aided by simulations of tomographic reconstruction. Quantitative criteria have been developed to optimize the design for the greatly variable shapes and positions of TCV plasmas.

• OSTI ID: 21266658
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 79; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BREMSSTRAHLUNG
CYCLOTRONS
DESIGN
ECR CURRENT DRIVE
ECR HEATING
ELECTRONS
EMISSION
HARD X RADIATION
PLASMA
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
RADIOMETERS
RF SYSTEMS
SAWTOOTH OSCILLATIONS
TCV TOKAMAK
X-RAY SPECTROMETERS