Text‐upgrade 2 MeV heavy ion beam probe (abstract)

• Main Authors: Ouroua, A., Hickok, R. L., Crowley, T. P., Connor, K. A., Lewis, J. F., McLaren, P. E., Schatz, J. G., Schwelberger, J.
• Format: Conference Proceeding
• Language: English
• ISSN: 0034-6748; 1089-7623
• DOI: 10.1063/1.1141751

A unique 2 MeV heavy ion beam probe diagnostic system, presently under construction, with two injection lines and two energy analyzers will be used to measure the space potential as well as density, electrostatic (and possibly magnetic) fluctuations, and average wave numbers in the TEXT upgrade tokamak. The capabilities of the 2 MeV beam include a good penetration of the TEXT‐U magnetic fields (up to 2.2 T) and access to most of the plasma cross section (90%) including all null points (during divertor operations), the top, bottom, and outside edges. We plan to use parallel plate electrostatic energy analyzers which require that 400 kV be held on a large electrode across a 20 cm vacuum gap. Feasibility tests of such analyzers are under way. Progress of construction and testing of different parts of the system are reported. A description of the 2 MeV heavy ion beam probe system and a discussion on the measurements to be performed will be presented. This work was supported by DOE.