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Tests of a diamond field-assisted positron moderator

Al-Qaradawi, IY, Sellin, PA and Coleman, PG (2002) Tests of a diamond field-assisted positron moderator Applied Surface Science, 194 (1-4). pp. 29-31.

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Diagnostic studies have been performed on a 70 μm thick diamond film with a view to its development as a possible field-assisted moderator (FAM) for slow positron emission. The film was coated on one side with a 200 nm gold electrode and on the other with a similar thickness of gold in the form of a fine mesh (10 μm lines, 40 μm spaces) in the central part of the diamond surface and a solid edge for electrical contact. A potential difference of up to 300 V could be held across the film with a leakage current of ∼ 10 nA. Although positron re-emission was observed from the diamond surface, the re-emitted fraction was observed to decrease when a bias of 300 V was applied across the film. This negative result is interpreted in terms of the drifting of thermalised positrons to the gold mesh lines, a conclusion supported by Doppler broadening measurements. The potential for the development of a diamond-film-based positron beam tagger is discussed. © 2002 Elsevier Science B.V. All rights reserved.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Al-Qaradawi, IY
Coleman, PG
Date : 21 June 2002
DOI : 10.1016/S0169-4332(02)00083-1
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:56
Last Modified : 24 Jan 2020 23:06

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