Author: Shao, J.H.
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TUPP02
 The Multi-Purpose Iris Diaphragm E-Beam Apparatus Series - Halo Detector  
 
  • A. Liu, J.R. Callahan
    Euclid TechLabs, Solon, Ohio, USA
  • J.H. Shao
    ANL, Lemont, Illinois, USA
  
  Funding: Project funded by the DOE SBIR and STTR programs under contract DE-SC0019538
Non-Gaussian beam distributions around the Gaussian core can be formed in an accelerator in both the transverse and longitudinal directions. Since there are no clearly defined criteria to distinguish the halo from the core, the measurement of the halo structure without affecting the core is challenging. Previously, a novel design of an iris diaphragm detector for transverse beam halo distributions and transverse profile (iris diaphragm e-beam apparatus series - halo, or IDEAS-halo) was reported by Euclid Techlabs*. This multi-purpose design not only measures the transverse beam distribution but may also work as a tunable collimator or an adjustable BPM. In this paper, the newest version of the IDEAS-halo and beam experiments using the ~ 2 MeV electron beam at the AWA Cathode Teststand (ACT) of ANL, and the ~ 600 keV "brazeless" compact accelerator beam at Euclid are discussed.
*: please see NAPAC 2019 and IBIC 2020 pre-press proceedings 		 
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TUPP04
 Experiments with Diamond Beam Halo Monitor  
 
  • S.V. Kuzikov, S.P. Antipov, P.V. Avrakhov, E.W. Knight
    Euclid TechLabs, Solon, Ohio, USA
  • J.G. Power, J.G. Power, J.H. Shao, J.H. Shao
    ANL, Lemont, Illinois, USA
  
  We propose diamond as a radiation hard material which can be used to measure the flux of passing particles based on a particle-induced conductivity effect. Our diamond beam halo monitor is based on a microwave measurement of the change in the resonator coupling and eigen frequency. For measurements we put a sensitive diamond sample in a resonator that intercepts the halo. By measuring the change in RF properties of the resonator, one can infer the beam halo parameters scanning across the beam to map its transverse distribution. In first experiments we used a Vertical Beam Test Stand, delivered DC electron beam of the 20-200 keV energy with the current up to 50 ’A, to characterize several diamond samples. We have also designed and fabricated a scanning diamond X-band resonator, which was tested at Argonne Wakefield Accelerator (AWA). In experiments at AWA we studied sensitivity and resolution of our monitor based on a single crystal diamond using multi-MeV, 1 pC - 500 pC picosecond electron bunches.  
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