Fast photodiode diagnostic on Alcator C-Mod tokamak to study the plasma edge/SOL structure

The tokamak is so far the most promising magnetic confinement configuration to control fusion scale plasmas and to be a large scale source of electricity in the future. Built in the shape of a torus of major and minor radius R and r respectively, the charged particles are confined by the superposition of a toroidal and a poloidal magnetic field. In order to study the transport processes that lead to the removal of energetic particles from the hot plasma, two tangentially viewing optical diagnostics have been installed to look at the plasma edge region (0.9 < < 1.1) of the Alcator C-Mod diverted tokamak. The toroidally looking views are coupled to fast photodiode amplifier circuits that record the D, brightness at a rate of 1 MHz. Two plasma-directed gas puffs are employed at the inboard and outboard plasma edges to enhance the emission at the desired toroidal locations. The absolutely calibrated views yield the required data for building radial and poloidal profiles of the intrinsic D, plasma brightness. The Abel inverted radial D, emissivity profile typically peaks at 30 W/m3/ster at I cm outside the separatrix ( ... 1.05) and drops on both sides of the separatrix.

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Nuclear Engineering

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2005

Author dc:creator

• Vetoʺ, Baʹlint

Advisor dc:contributor.advisor

• James Terry.

• Nuclear Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/34459

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/34459