The Anomalous Currents In The Front Foils of the JET Lost Alpha Diagnostic KA-2

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We have examined the observed currents in the front foils of the JET Faraday cup lost alpha particle diagnostic KA-2. In particular, we have sought to understand the currents during Ohmic plasmas for which the ion flux at the detectors was initially assumed to be negligible. We have considered two sources of this current: plasma ions #2; both deuterium and impurity#3; in the vicinity of the detector #2; including charge exchange neutrals#3; and photoemission from scattered UV radiation. Based upon modeling and empirical observation, the latter source appears most likely and, moreover, seems to be applicable to the currents in ... continued below

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F.E. Cecil, V. Kiptily, A. Salmi, A. Horton, K. Fullard, A. Murari, D. Darrow, K. Hill and JET-EFDA Contributors May 4, 2011.

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We have examined the observed currents in the front foils of the JET Faraday cup lost alpha particle diagnostic KA-2. In particular, we have sought to understand the currents during Ohmic plasmas for which the ion flux at the detectors was initially assumed to be negligible. We have considered two sources of this current: plasma ions #2; both deuterium and impurity#3; in the vicinity of the detector #2; including charge exchange neutrals#3; and photoemission from scattered UV radiation. Based upon modeling and empirical observation, the latter source appears most likely and, moreover, seems to be applicable to the currents in the front foil during ELMy H-mode plasmas. A very thin gold or nickel foil attached to the present detector aperture is proposed as a solution to this problem, and realistic calculations of expected fluxes of lost energetic neutral beam ions during TF ripple experiments are presented as justification of this proposed solution.

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  • Review of Scientific Instruments (May 2011)

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  • Report No.: PPPL-4620
  • Grant Number: DE-ACO2-09CH11466
  • Office of Scientific & Technical Information Report Number: 1013256
  • Archival Resource Key: ark:/67531/metadc831541

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  • May 4, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 2:26 p.m.

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F.E. Cecil, V. Kiptily, A. Salmi, A. Horton, K. Fullard, A. Murari, D. Darrow, K. Hill and JET-EFDA Contributors. The Anomalous Currents In The Front Foils of the JET Lost Alpha Diagnostic KA-2, report, May 4, 2011; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc831541/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.