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  Derivation of bolometer equations relevant to operation in fusion experiments

Giannone, L., Mast, K., Schubert, M., NBI Team, ECRH Team, & W7-AS Team (2002). Derivation of bolometer equations relevant to operation in fusion experiments. Review of Scientific Instruments, 73(9), 3205-3214.

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 Creators:
Giannone, L.1, 2, 3, Author           
Mast, K.4, Author           
Schubert, M.2, Author           
NBI Team, Author  
ECRH Team, Author  
W7-AS Team, Author  
Affiliations:
1Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              
2Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
3W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856310              
4External Organizations, ou_persistent22              

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 Abstract: An overview of the bolometer diagnostic in the W7-AS stellarator is presented. Bolometers are used in plasma physics to measure radiated power losses that are mainly produced by impurity lines and neutral particles. With an array of collimated bolometers, the spatial and temporal evolution of these losses can be measured. The accuracy of the inversion of the line integrated measurements into local values necessitates a careful calibration and conversion of the measured signal into an incident power of each foil. Using transmission line theory to determine the equivalent circuit for the sensor and cable, the equations for bolometer calibration and measurement, taking into account the cable resistance and capacitance between amplifier and detector, are derived. The ability to switch the bolometer amplifiers from measurement to calibration mode between discharges allows continuous monitoring of the calibration constants of the bolometer foil. Measurements by bolometer cameras and their Abel inversion for the radial profile of radiated power in W7-AS are presented. (C) 2002 American Institute of Physics.

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Language(s): eng - English
 Dates: 2002-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 20485
ISI: 000177600300011
 Degree: -

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Title: Review of Scientific Instruments
  Alternative Title : Rev. Sci. Instrum.
Source Genre: Journal
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Pages: - Volume / Issue: 73 (9) Sequence Number: - Start / End Page: 3205 - 3214 Identifier: ISSN: 0034-6748