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Title: Negative ion beam characterisation in BATMAN by mini-STRIKE: Improved design and new measurements

The ITER project requires additional heating provided by two injectors of neutral beams resulting from the neutralisation of accelerated negative ions. To study and optimise negative ion production, the SPIDER test facility (particle energy 100keV; beam current 50A) is under construction in Padova, with the aim of testing beam characteristics and to verify the source proper operation. The SPIDER beam will be characterised by the instrumented calorimeter STRIKE, whose main components are one-directional carbon fibre carbon composite tiles. Some prototype tiles have been employed in 2012 as a small-scale version (mini-STRIKE) of the entire system to investigate the features of the beam from BATMAN at IPP-Garching. As the BATMAN beamlets are superposed at the measurement position, about 1m from the grounded grid, an actively cooled copper mask is located in front of the tiles; holes in the mask create an artificial beamlet structure. Recently the mini-STRIKE has been updated, taking into account the results obtained in the first campaign. In particular the spatial resolution of the system has been improved by increasing the number of the copper mask holes. Moreover a custom measurement system has been realized for the thermocouple signals and employed in BATMAN in view of its usemore » in SPIDER. The present contribution gives a description of the new design of the system as well as of the thermocouple measurements system and its field test. A new series of measurements has been carried out in BATMAN. The BATMAN beam characterisation in different experimental conditions is presented.« less
Authors:
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  1. Consorzio RFX (CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA) (Italy)
  2. (Italy)
  3. Università degli Studi di Padova, Via 8 Febbraio 2, I-35122 Padova (Italy)
  4. (PD) Italy (Italy)
  5. Max-Planck-Institut für Plasmaphysik, D-85748 Garching bei München (Germany)
  6. Istituto di Fisica del Plasma (IFP-CNR) – Via Cozzi 53, 20125, Milano (Italy)
Publication Date:
OSTI Identifier:
22391456
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1655; Journal Issue: 1; Conference: NIBS 2014: 4. International Symposium on Negative Ions, Beams and Sources, Garching (Germany), 6-10 Oct 2014; Other Information: (c) 2015 U.S. Government; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ANIONS; BEAM CURRENTS; BEAM INJECTION HEATING; CALORIMETERS; CARBON FIBERS; COPPER; DESIGN; FIELD TESTS; ION BEAMS; IPP GARCHING; ITER TOKAMAK; NEUTRAL ATOM BEAM INJECTION; PERFORMANCE TESTING; SPATIAL RESOLUTION; TEST FACILITIES; THERMOCOUPLES