Tungsten moderator of Venetian blinds- and honeycomb-type for the slow positron source on hard synchrotron radiation of SPring-8 storage ring

Authors
Plokhoi, VV Kandiev, YZ Samarin, SI Malyshkin, GN Baidin, GV Litvinenko, IA Nikitin, VP
Citation
Vv. Plokhoi et al., Tungsten moderator of Venetian blinds- and honeycomb-type for the slow positron source on hard synchrotron radiation of SPring-8 storage ring, NUCL INST A, 470(1-2), 2001, pp. 44-49
Citations number
19
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
01689002 → ACNP
Volume
470
Issue
1-2
Year of publication
2001
Pages
44 - 49
Database
ISI
SICI code
0168-9002(20010901)470:1-2<44:TMOVBA>2.0.ZU;2-1
Abstract
The paper considers designs of moderators where fast positron stopping medi um consists of very fine tungsten strips separated by vacuum gaps and the s trips are arranged into Venetian blinds- or honeycomb-type structures. Mode rator efficiency is evaluated through Monte-Carlo simulations. According to the maximal estimate, the efficiency of conversion of fast positrons into slow ones in the Venetian blinds and honeycomb-type moderators is similar t o5 x 10(-3) for the reasonable thickness of the tungsten foil. If such mode rator is used, the intensity of slow positron source on the hard synchrotro n of SPring-8 storage ring can reach the level of similar to5 x 10(10) e(+) /s. (C) 2001 Elsevier Science B.V. All rights reserved.