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Open Access Publications from the University of California

Scholarly Works (5 results)

  • Article
Lawrence Berkeley National Laboratory (2011)
An RF system of 500W - 10.75 to 12.75 GHz was designed and integrated into the Advanced Electron Cyclotron Resonance - Upgrade (AECR-U) ion source of the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. The AECR-U produces ion beams for the Cyclotron giving large flexibility of ion species and charge states. The broadband frequency of a Traveling Wave Tube (TWT) allows modifying the volume that couples and heats the plasma. The TWT system design and integration with the AECR-U ion source and results from commissioning are presented.
    Cover page: Integrating a Traveling Wave Tube into an AECR-U ion source
    • Article
    LBL Publications (2009)

    The sum of ionization and charge-exchange cross sections of several gas targets (H2, N2, He, Ne, Kr, Xe, Ar, and water vapor) impacted by 1MeV K+ beam are measured. In a high current ion beam, the self-electric field of the beam is high enough that ions produced from the gas ionization or charge exchange by the ion beam are quickly swept to the sides of accelerator. The flux of the expelled ions is measured by a retarding field analyzer. This allows accurate measuring of the total charge-changing cross sections (ionization plus charge exchange) of the beam interaction with gas. Cross sections for H2, He, and N2 are simulated using classical trajectory Monte Carlo (CTMC) method and compared with the experimental results, showing good agreement.

      Cover page: Measurements of the Total Charge-Changing Cross Sections for Collisions of Fast Ions with Target Gas Using High Current Experiment
      • Article
      LBL Publications (2006)
        Cover page: Electron cloud measurements in heavy-ion driver for HEDP and inertial fusion energy
        • Article
        LBL Publications (2003)
          Cover page: Recent results from the high current experiment for heavy ion inertial fusion
          • Article
          • Peer Reviewed
          UC Berkeley Previously Published Works (2017)
          In the outer space down to the altitudes routinely flown by the larger commercial aircrafts, radiation is a serious problem for the microelectronics circuits. The 88-Inch Cyclotron at Lawrence Berkeley National Laboratory is a sector-focused cyclotron and is the home of the Berkeley Accelerator Space Effects Facility, where the effects of energetic particles on sensitive microelectronics are studied with the goal of designing electronic systems for the space community. The paper will describe the flexibility of the facility and its capabilities for testing the bombardment of the electronics by heavy ions, light ions, and neutrons.
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