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Low-energy hydrogen flux measurements at the TORTUR tokamak with negative ion conversion

Abstract

The interaction of a tokamak plasma with the vessel wall is one of the most important subjects in thermonuclear research. The information about this interaction is not complete without direct detection of the outward stream of low-energy, down to a few electronvolts, neutral hydrogen or deuterium atoms. The detection of these atoms is the subject of this thesis. An appropriate method to analyse the atoms which are emitted from the edge plasma is to use a time-of-flight analyser. This kind of apparatus selects particles according to their velocities with-out distinguishing between different masses. If these analysers use the Daly-method the lowest measurable energy of the hydrogen atoms is approximately 25 electronvolts. To increase the detection efficiency a new detection method was developed. This new method uses the conversion of hydrogen atoms into H- ions on a cesiated tungsten surface. By this conversion the lowest measurable energy is decreased down to 5 electron-volt. (author). 93 refs.; 44 figs.; 7 tabs.
Publication Date:
Jun 13, 1990
Product Type:
Thesis/Dissertation
Report Number:
INIS-mf-13076
Reference Number:
SCA: 700320; PA: AIX-23:013616; SN: 92000639312
Resource Relation:
Other Information: DN: This work was performed as part of the research programme of the Foundation for Fundamental Research of Matter (FOM), with financial support from the Netherlands Organization for Scientific Research (NWO) and EURATOM. It was carried out at the FOM-Institute for Plasma-Physics `Rijnhuizen`, Nieuwegein, the Netherlands; includes summary in Dutch.; TH: Proefschrift (Dr.).Thesis; PBD: 13 Jun 1990
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; EV RANGE 01-10; SENSITIVITY; EV RANGE 10-100; TIME-OF-FLIGHT SPECTROMETERS; CESIUM; EXPERIMENTAL DATA; HYDROGEN; HYDROGEN IONS 1 MINUS; TUNGSTEN; WALL EFFECTS; 700320; PLASMA DIAGNOSTIC TECHNIQUES AND INSTRUMENTATION
OSTI ID:
10111292
Research Organizations:
Rijksuniversiteit Utrecht (Netherlands)
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Other: ON: DE92614450; TRN: NL91C0900013616
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
NLN
Size:
136 p.
Announcement Date:
Jun 30, 2005

Citation Formats

Toledo, Wiebo van. Low-energy hydrogen flux measurements at the TORTUR tokamak with negative ion conversion. Netherlands: N. p., 1990. Web.
Toledo, Wiebo van. Low-energy hydrogen flux measurements at the TORTUR tokamak with negative ion conversion. Netherlands.
Toledo, Wiebo van. 1990. "Low-energy hydrogen flux measurements at the TORTUR tokamak with negative ion conversion." Netherlands.
@misc{etde_10111292,
title = {Low-energy hydrogen flux measurements at the TORTUR tokamak with negative ion conversion}
author = {Toledo, Wiebo van}
abstractNote = {The interaction of a tokamak plasma with the vessel wall is one of the most important subjects in thermonuclear research. The information about this interaction is not complete without direct detection of the outward stream of low-energy, down to a few electronvolts, neutral hydrogen or deuterium atoms. The detection of these atoms is the subject of this thesis. An appropriate method to analyse the atoms which are emitted from the edge plasma is to use a time-of-flight analyser. This kind of apparatus selects particles according to their velocities with-out distinguishing between different masses. If these analysers use the Daly-method the lowest measurable energy of the hydrogen atoms is approximately 25 electronvolts. To increase the detection efficiency a new detection method was developed. This new method uses the conversion of hydrogen atoms into H- ions on a cesiated tungsten surface. By this conversion the lowest measurable energy is decreased down to 5 electron-volt. (author). 93 refs.; 44 figs.; 7 tabs.}
place = {Netherlands}
year = {1990}
month = {Jun}
}