Large scale positron production for physics needs via fission reactors

Ottewitte, E.H.

doi:10.1063/1.36457

Cited by 2 publications

(2 citation statements)

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“…ε M should be a constant for all laboratories where the same moderator material, with the same thickness and the same conditioning has been used. In order to avoid the above mentioned confusion, we give here both the efficiency calculated according to equation (1) and the relevant parameters in equation (2).…”

Section: Performancementioning

confidence: 99%

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A new electrostatic positron beam for surface studies

Zecca

Bettonte

Paridaens

et al. 1998

Meas. Sci. Technol.

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A new electrostatic positron beam has been constructed and tested. The energy range spans more than three decades, from less than 50 eV to more than 50 keV. The machine can operate in a low-energy mode (50 eV to 2 keV) with a beam diameter (FWHM) from 2.9 to 1.7 mm or in a high-energy mode (1 keV to 50 keV) with a FWHM from 1.4 to 1.0 mm. The transverse spot position on the target is very stable, with wandering being much smaller than the beam diameter. The apparatus transmission function is very flat, with an intensity change of only 30% when going from 10 eV to 50 keV. The product of moderation and optical transmission efficiency is 1.7 × 10 −4 , corresponding to 800-1000 e + s −1 with a 1 mCi 22 Na source. The apparatus shows low noise in S -parameter measurements. The background of the high-energy wing of the annihilation line is also one of the best reported. Optical and constructional details are given.

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Section: Performancementioning

confidence: 99%

“…The importance of variable-energy positron beams has increased enormously during the last decade, because of their application in near-surface defect analysis [1][2][3][4]. A magnetic transport solenoid-type slow positron beam has been in use at Trento University since 1988 (see, for instance, [5]).…”

Section: Introductionmentioning

confidence: 99%