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Title: Numerical Assessment of the Diagnostic Capabilities of the Instrumented Calorimeter for SPIDER (STRIKE)

Abstract

An important feature of the ITER project is represented by additional heating via injection of neutral beams from accelerated negative ions. To study and optimise their production, the SPIDER test facility is under construction in Padova, with the aim of testing beam characteristics and to verify the source proper operation.STRIKE (Short-Time Retractable Instrumented Kalorimeter Experiment) is a diagnostic to characterise the SPIDER negative ion beam during short operation (several seconds). During long pulse operations, STRIKE is parked off-beam in the vacuum vessel. The most important measurements are beam uniformity, beamlet divergence and stripping losses. STRIKE is directly exposed to the beam and is formed of 16 tiles, one for each beamlet groups. The measurements are provided by thermal cameras, current sensors, thermocouples and electrostatic sensors. This paper presents the investigation of the influence on the response of STRIKE of: thermal characteristics of the tile material, exposure angle, features of some dedicated diagnostics. The uniformity of the beam will be studied by measurements of the current flowing through each tile and by thermal cameras. Simulations show that it will be possible to verify experimentally whether the beam meets the ITER requirement about the maximum allowed beam non-uniformity (below {+-}10%). In themore » simulations also the influence of the beam halo has been included; the effect of off-perveance conditions has been studied. To estimate the beamlet divergence, STRIKE can be moved along the beam direction at two different distances from the accelerator. The optimal positions have been defined taking into account design constraints. The effect of stripping on the comparison between currents and heat loads has been assessed; this will allow to obtain an experimental estimate of stripping. Electrostatic simulations have provided the suitable tile biasing voltage in order to reabsorb secondary particles into the same tile as the one where they were emitted from.« less

Authors:
; ; ; ;  [1];  [1];  [2]
  1. Consorzio RFX, Euratom-ENEA association, Padova, corso Stati Uniti, 4- 35127 - Padova (Italy)
  2. (Italy)
Publication Date:
OSTI Identifier:
21611705
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1390; Journal Issue: 1; Conference: 2. international symposium on negative ions, beams and sources, Takayama City (Japan), 16-19 Nov 2010; Other Information: DOI: 10.1063/1.3637430; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANIONS; BEAM INJECTION HEATING; CALORIMETERS; CAMERAS; COMPARATIVE EVALUATIONS; DESIGN; ELECTRIC POTENTIAL; ELECTROSTATIC ACCELERATORS; HEATING LOAD; ITER TOKAMAK; NEUTRAL ATOM BEAM INJECTION; NUMERICAL ANALYSIS; PLASMA BEAM INJECTION; PLASMA DIAGNOSTICS; SENSORS; STRIPPING; TEST FACILITIES; THERMOCOUPLES; ACCELERATORS; BEAM INJECTION; CHARGED PARTICLES; CLOSED PLASMA DEVICES; DIRECT REACTIONS; EVALUATION; HEATING; IONS; MATHEMATICS; MEASURING INSTRUMENTS; NUCLEAR REACTIONS; PLASMA HEATING; THERMONUCLEAR DEVICES; THERMONUCLEAR REACTORS; TOKAMAK DEVICES; TOKAMAK TYPE REACTORS; TRANSFER REACTIONS

Citation Formats

Dalla Palma, M., Pasqualotto, R., Rizzolo, A., Serianni, G., Veltri, P., De Muri, M., and Dipartimento di Ingegneria Elettrica, Padova University, Italy via Gradenigo, 6/A - 35131 - Padova. Numerical Assessment of the Diagnostic Capabilities of the Instrumented Calorimeter for SPIDER (STRIKE). United States: N. p., 2011. Web. doi:10.1063/1.3637430.
Dalla Palma, M., Pasqualotto, R., Rizzolo, A., Serianni, G., Veltri, P., De Muri, M., & Dipartimento di Ingegneria Elettrica, Padova University, Italy via Gradenigo, 6/A - 35131 - Padova. Numerical Assessment of the Diagnostic Capabilities of the Instrumented Calorimeter for SPIDER (STRIKE). United States. doi:10.1063/1.3637430.
Dalla Palma, M., Pasqualotto, R., Rizzolo, A., Serianni, G., Veltri, P., De Muri, M., and Dipartimento di Ingegneria Elettrica, Padova University, Italy via Gradenigo, 6/A - 35131 - Padova. Mon . "Numerical Assessment of the Diagnostic Capabilities of the Instrumented Calorimeter for SPIDER (STRIKE)". United States. doi:10.1063/1.3637430.
@article{osti_21611705,
title = {Numerical Assessment of the Diagnostic Capabilities of the Instrumented Calorimeter for SPIDER (STRIKE)},
author = {Dalla Palma, M. and Pasqualotto, R. and Rizzolo, A. and Serianni, G. and Veltri, P. and De Muri, M. and Dipartimento di Ingegneria Elettrica, Padova University, Italy via Gradenigo, 6/A - 35131 - Padova},
abstractNote = {An important feature of the ITER project is represented by additional heating via injection of neutral beams from accelerated negative ions. To study and optimise their production, the SPIDER test facility is under construction in Padova, with the aim of testing beam characteristics and to verify the source proper operation.STRIKE (Short-Time Retractable Instrumented Kalorimeter Experiment) is a diagnostic to characterise the SPIDER negative ion beam during short operation (several seconds). During long pulse operations, STRIKE is parked off-beam in the vacuum vessel. The most important measurements are beam uniformity, beamlet divergence and stripping losses. STRIKE is directly exposed to the beam and is formed of 16 tiles, one for each beamlet groups. The measurements are provided by thermal cameras, current sensors, thermocouples and electrostatic sensors. This paper presents the investigation of the influence on the response of STRIKE of: thermal characteristics of the tile material, exposure angle, features of some dedicated diagnostics. The uniformity of the beam will be studied by measurements of the current flowing through each tile and by thermal cameras. Simulations show that it will be possible to verify experimentally whether the beam meets the ITER requirement about the maximum allowed beam non-uniformity (below {+-}10%). In the simulations also the influence of the beam halo has been included; the effect of off-perveance conditions has been studied. To estimate the beamlet divergence, STRIKE can be moved along the beam direction at two different distances from the accelerator. The optimal positions have been defined taking into account design constraints. The effect of stripping on the comparison between currents and heat loads has been assessed; this will allow to obtain an experimental estimate of stripping. Electrostatic simulations have provided the suitable tile biasing voltage in order to reabsorb secondary particles into the same tile as the one where they were emitted from.},
doi = {10.1063/1.3637430},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1390,
place = {United States},
year = {2011},
month = {9}
}