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Title: Studies on space charge neutralization and emittance measurement of beam from microwave ion source

A 2.45 GHz microwave ion source together with a beam transport system has been developed at VECC to study the problems related with the injection of high current beam into a compact cyclotron. This paper presents the results of beam profile measurement of high current proton beam at different degrees of space charge neutralisation with the introduction of neon gas in the beam line using a fine leak valve. The beam profiles have been measured at different pressures in the beam line by capturing the residual gas fluorescence using a CCD camera. It has been found that with space charge compensation at the present current level (∼5 mA at 75 keV), it is possible to reduce the beam spot size by ∼34%. We have measured the variation of beam profile as a function of the current in the solenoid magnet under the neutralised condition and used these data to estimate the rms emittance of the beam. Simulations performed using equivalent Kapchinsky-Vladimirsky beam envelope equations with space charge neutralization factor are also presented to interpret the experimental results.
Authors:
; ; ; ;  [1]
  1. Variable Energy Cyclotron Centre, 1-AF, Bidhannagar, Kolkata 700 064 (India)
Publication Date:
OSTI Identifier:
22482591
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAM CURRENTS; BEAM PROFILES; BEAM TRANSPORT; CHARGE-COUPLED DEVICES; CYCLOTRONS; FLUORESCENCE; GHZ RANGE 01-100; ION SOURCES; KEV RANGE 10-100; MICROWAVE RADIATION; NEON; PROTON BEAMS; SOLENOIDS; SPACE CHARGE; VALVES