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Title: MEASUREMENT OF THE HIGH ENERGY COMPONENT OF THE X-RAY SPECTRA INTHE VENUS ECR ION SOURCE

High performance electron cyclotron resonance (ECR) ion sources, such as VENUS (Versatile ECR for Nuclear Science), produce large amounts of x-rays. By studying their energy spectra, conclusions can be drawn about the electron heating process and the electron confinement. In addition, the bremsstrahlung from the plasma chamber is partly absorbed by the cold mass of the superconducting magnet adding an extra heat load to the cryostat. Germanium or NaI detectors are generally used for x-ray measurements. Due to the high x-ray flux from the source, the experimental set-up to measure bremsstrahlung spectra from ECR ion sources is somewhat different than for the traditional nuclear physics measurements these detectors are generally used for. In particular the collimation and background shielding can be problematic. In this paper we will discuss the experimental set-up for such a measurement, the energy calibration and background reduction, the correction for detector efficiency, the shielding of the detector and collimation of the x-ray flux. We will present x-ray energy spectra and cryostat heating rates in dependence of various ion source parameters such as confinement fields, minimum B-field, rf power and heating frequency.
Authors:
; ; ; ; ; ; ;
Publication Date:
OSTI Identifier:
929099
Report Number(s):
LBNL--63604
Journal ID: ISSN 0034-6748; RSINAK; R&D Project: N88OPS; BnR: KB0402030; TRN: US0803468
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 79; Journal Issue: 3; Related Information: Journal Publication Date: 03/2008
Research Org:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org:
USDOE Director. Office of Science. NuclearPhysics
Country of Publication:
United States
Language:
English
Subject:
43; BREMSSTRAHLUNG; CALIBRATION; CONFINEMENT; CRYOSTATS; ECR ION SOURCES; EFFICIENCY; ELECTRON CYCLOTRON-RESONANCE; ELECTRONS; ENERGY SPECTRA; GERMANIUM; HEATING; HEATING RATE; ION SOURCES; NAI DETECTORS; NUCLEAR PHYSICS; SHIELDING; SPECTRA; SUPERCONDUCTING MAGNETS; X-RAY SPECTRA