High sensitivity detectors for measurement of space potential fluctuations

Author

Keating, L.M. ; Schoch, P.M. ; Crowley, T.P. ; Russell, W.G. ; Schatz, J.G., Jr.

Author_Institution

Rensselaer Polytech. Inst., Troy, NY, USA

Volume

22

Issue

4

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

424

Lastpage

429

Abstract

A detection technique yielding an order of magnitude increase in the sensitivity of a Proca-Green type energy analyzer to beam energy fluctuations has been demonstrated. A sensitivity of <1 part in 10 ⁶ is possible. The technique can be used to increase the sensitivity of a Heavy Ion Beam Probe (HIBP) to space potential fluctuations in a plasma. The increase in sensitivity is achieved by splitting the detected ion beam into 10 smaller beamlets and summing the signals produced by the beamlets. Experimental results from an ion beam test facility are presented along with the projected results if implemented on the 2 MeV HIBP on the TEXT-Upgrade tokamak

Keywords

Tokamak devices; fluctuations; ion beams; plasma diagnostics; plasma probes; plasma toroidal confinement; sensitivity; space charge; Proca-Green type energy analyzer; TEXT-Upgrade tokamak; beam energy fluctuations; beamlets; detection technique; heavy ion beam probe; high sensitivity detectors; ion beam test facility; sensitivity; space potential fluctuations; splitting; Current measurement; Detectors; Electrostatic analysis; Energy measurement; Extraterrestrial measurements; Fluctuations; Geometry; Ion beams; Plasma measurements; Test facilities;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.310650

Filename

310650