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Title: Effect of the solenoid in various conditions of the laser ion source at Brookhaven National Laboratory

In the laser ion source (LIS) at the Brookhaven National Laboratory (BNL), a solenoid is used to guide the laser ablation plasma and modulate the extracted beam current. Many types of ion species are guided. In some cases, the plasma plume is injected into the solenoid away from the solenoidal axis. To investigate the effects of the solenoid on the beam extracted from the plasma that has different properties, the beam current was measured in the setup of the LIS at the BNL. The beam current of Li, Al, Si, Fe, and Au increased when the magnetic field was applied. For most of the species the peak current and the total charge within a single beam pulse increased around 10 times with a magnetic field less than 100 G. In addition, for some species the rate of increase of the peak currents became smaller when the magnetic flux densities were larger than certain values depending on the species. In this case, the current waveforms were distorted. At the same magnetic field value, the field was more effective on lighter species than on heavier ones. When plasma was injected offset from the axis of the solenoid, peak current and total chargemore » became half of those without offset. The experimental data are useful for the operation of the LIS at the BNL.« less
Authors:
 [1] ;  [2] ;  [3] ; ;  [4]
  1. Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa 216-8502 (Japan)
  2. (Japan)
  3. Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0108 (Japan)
  4. Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
Publication Date:
OSTI Identifier:
22482916
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 2; 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; ABLATION; BEAM CURRENTS; BNL; FLUX DENSITY; ION SOURCES; LASERS; MAGNETIC FIELDS; MAGNETIC FLUX; PEAKS; PLASMA; PULSES; SOLENOIDS; WAVE FORMS