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

Journal Article · Mon Sep 26 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3637430· OSTI ID:21611705

Dalla Palma, M; Pasqualotto, R; Rizzolo, A; Serianni, G; Veltri, P ^[1]; De Muri, M ^[1]

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1. Consorzio RFX, Euratom-ENEA association, Padova, corso Stati Uniti, 4- 35127 - Padova (Italy)

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.

• OSTI ID: 21611705
• Journal Information: AIP Conference Proceedings, Vol. 1390, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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