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Title: NIO1 diagnostics

The radio frequency ion source NIO1, jointly developed by Consorzio RFX and INFN-LNL, will generate a 60kV-135mA hydrogen negative ion beam, composed of 9 beamlets over an area of about 40 × 40 mm{sup 2}. This experiment will operate in continuous mode and in conditions similar to those foreseen for the larger ion sources of the Neutral Beam Injectors for ITER. The modular design of NIO1 is convenient to address the several still open important issues related to beam extraction, optics, and performance optimization. To this purpose a set of diagnostics is being implemented. Electric and water cooling plant related measurements will allow monitoring current, pressure, flow, and temperature. The plasma in the source will be characterized by emission spectroscopy, cavity ring-down and laser absorption spectroscopy. The accelerated beam will be analyzed with a fast emittance scanner, its intensity profile and divergence with beam emission spectroscopy and visible tomography. The power distribution of the beam on the calorimeter will be monitored by thermocouples and by an infrared camera. This contribution presents the implementation and initial operation of some of these diagnostics in the commissioning phase of the experiment, in particular the cooling water calorimetry and emission spectroscopy.
Authors:
; ; ;  [1] ;  [2] ;  [1] ;  [3] ;  [4]
  1. Consorzio RFX, Corso Stati Uniti 4, I-35127 Padova (Italy)
  2. INFN-LNL, v.le dell'Università 2, I-35020, Legnaro (PD) Italy (Italy)
  3. (PD) Italy (Italy)
  4. Università degli Studi di Padova, Via 8 Febbraio 2, I-35122 Padova (Italy)
Publication Date:
OSTI Identifier:
22391459
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; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION SPECTROSCOPY; BEAM EXTRACTION; BEAM INJECTION HEATING; BEAM MONITORS; BEAM PRODUCTION; CALORIMETRY; CAMERAS; DESIGN; EMISSION SPECTROSCOPY; HYDROGEN IONS 1 MINUS; ION BEAMS; ION SOURCES; ITER TOKAMAK; MONITORING; NEUTRAL ATOM BEAM INJECTION; PLASMA; PLASMA DIAGNOSTICS; RADIOWAVE RADIATION; THERMOCOUPLES; TOMOGRAPHY