05: Controls and Diagnostics
Paper Title Page
MOZZO06 Microcontrollers as Gate and Delay Generators for Time Resolved Measurements 57
 
  • B.C. Isherwood
    MSU, East Lansing, Michigan, USA
  • G. Machicoane
    FRIB, East Lansing, Michigan, USA
 
  Funding: This research was made possible by the National Science Foundation under NSF Grant 1632761 and the U.S. Department of Energy Award Number DE-SC0018362.
The diffusion of electrons from ECRIS plasmas results in the emission of bremsstrahlung distributions from the plasma chamber. ECRIS bremsstrahlung measurements that are both time- and energy-resolved are often challenging to perform due to the 10’s; 100’s ms timescale that the plasma evolves over. However, the advancement of low-cost microcontrollers over the last decade makes timing and gating photon spectrometers easier. We present a proof of principle measurement which uses an Arduino microcontroller as a gate-and-delay generator for a High Purity Germanium (HPGe) detector. An example plot of the time-resolved bremsstrahlung spectrum, triggered by beam current variation induced by kinetic instabilities, is shown.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOZZO06  
About • Received ※ 30 September 2020 — Revised ※ 21 October 2020 — Accepted ※ 19 January 2021 — Issue date ※ 23 December 2021
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WEZZO05
Studies of ECR Plasma Chamber Contamination With Accelerated Beams and Diamond Detectors  
 
  • B.T. Roeder, J.E. Ärje, D.P. May, S.J. Yennello
    Texas A&M University Cyclotron Institute, College Station, Texas, USA
  • F.P. Abegglen, G.J. Kim, G. Tabacaru
    Texas A&M University, Cyclotron Institute, College Station, Texas, USA
 
  While developing stable and re-accelerated rare isotope beams (RIB) for acceleration with the TAMU K500 cyclotron, a background of various stable beams has been observed. It has been determined that this background is arising from alloys and contamination in the components of our ECR ion sources, in particular, the aluminum alloy plasma chamber. We have developed a detector system based on diamond detector telescopes that allows us to measure the composition of the beam after acceleration with the K500 cyclotron at TAMU. Using this technique, we have been able to develop ion source and cyclotron tuning methods to minimize the stable beam background and maximize the stable beams of interest and/or the RIBs. We also endeavor to reduce the stable beam background from the ECR ion sources using techniques such as pure aluminum liners. In my presentation, I plan to show our accelerated beam detection setup with diamond detectors. I also plan to present about the background we have measured with this setup from the ECRIS components, in particular, the plasma chamber. Finally, I will comment on our efforts to reduce this background.  
slides icon Slides WEZZO05 [1.166 MB]  
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WEZZO10 Electron Cyclotron Emission Imaging of Electron Cyclotron Resonance Ion Source Plasmas 164
 
  • L.E. Henderson, H.L. Clark, C.A. Gagliardi
    Texas A&M University, Cyclotron Institute, College Station, Texas, USA
  • D.P. May
    Texas A&M University Cyclotron Institute, College Station, Texas, USA
 
  A new imaging system for Electron Cyclotron Resonance Ion Sources (ECRIS) has been designed and is being built. This K- and Ka-band camera will extract localized measurements of absolute energy and relative number density for ECRIS plasma electrons by imaging their Electron Cyclotron Emission (ECE) spectra, as the frequency, shape, and strength of the ECE harmonics correlate directly with the local magnetic field, electron energy, and plasma density. The design of the overall quasi-optical system will be presented, including novel ceramic optics for the radial viewports of the Cyclotron Institute’s ECRIS and metamaterial mirrors with electronically controllable reflectivity. Spatial resolution sufficient to distinguish important plasma regions and temporal resolution sufficient to study dynamic plasma processes is expected.  
slides icon Slides WEZZO10 [10.583 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEZZO10  
About • Received ※ 28 September 2020 — Revised ※ 07 October 2020 — Accepted ※ 15 October 2020 — Issue date ※ 16 November 2020
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