Automation of variable low-energy positron beam experiments

Citation
J. Jayapandian et al., Automation of variable low-energy positron beam experiments, NUCL INST A, 444(3), 2000, pp. 622-625
Citations number
4
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
444
Issue
3
Year of publication
2000
Pages
622 - 625
Database
ISI
SICI code
0168-9002(20000421)444:3<622:AOVLPB>2.0.ZU;2-X
Abstract
By exploiting the special BIOS interrupt (INT 1CH) of PC in conjunction wit h a compatible high-voltage controller card and menu-driven control program , we report here the automation of variable low-energy posit ron beam exper iments. The beam experiment consists of monitoring the Doppler broadening l ineshape parameters corresponding to the annihilation 511 keV gamma-ray at various positron beam implantation energies. The variation and monitoring o f the sample high voltage, which determines positron beam energy, is carrie d out using a controller add-on card coupled to a 0-30 kV high-voltage unit . The design features of this controller card are discussed. This controlle r card is housed in a PC, which also houses a multichannel analyser (MCA) c ard. The MCA stores the Doppler energy spectrum of the annihilation gamma-r ay. The interactive control program, written in Turbo C, carries out the as signed tasks. The design features of the automation and results are present ed. (C) 2000 Elsevier Science B.V. All rights reserved,