Author: Hartzell, J.J.
Paper Title Page
TUPWI042 Initial Results from Streaked Low-energy Ultra-fast Electron Diffraction System 2339
 
  • J.J. Hartzell, R.B. Agustsson, S. Boucher, L. Faillace, A.V. Smirnov
    RadiaBeam, Santa Monica, California, USA
  • P. Musumeci, E.W. Threlkeld
    UCLA, Los Angeles, California, USA
  
  RadiaBeam, in collaboration with UCLA, is developing an inexpensive, low-energy, ultra-fast, streaked electron diffraction (S-UED) system which allows one to reconstruct a single ultrafast event with a single pulse of electrons using and RF deflector. The high-frequency (GHz), high voltage, phase-locked RF field in the deflector enables temporal resolution of atomic events as fine as sub-100 fs. In this paper, we present an overview of the system being developed and the initial experimental results. We also discuss the challenges based on our design of a UED system that incorporates a novel, high-resolution dielectric-loaded RF deflector and a solid-state X-band amplifier.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPWI042  
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WEAD2 Experimental Results of Carbon NanoTube Cathodes inside RF Environment 2475
 
  • L. Faillace, S. Boucher, J.J. Hartzell, A.Y. Murokh
    RadiaBeam, Santa Monica, California, USA
  • D. Mihalcea, P. Piot, J.C.T. Thangaraj
    Fermilab, Batavia, Illinois, USA
  • H. Panuganti
    Northern Illinois University, DeKalb, Illinois, USA
  
  Funding: Work supported by US DOE SBIR grant # DE-SC0004459
Carbon Nano Tubes (CNT’s) as field-emitters have been investigated for more than two decades and can produce relatively low emittance electron beams for a given cathode size. Unlike thermionic cathodes, CNT cathodes are able to produce electrons at room temperature and relatively low electric field (a few MV/m). In collaboration with FermiLab, we have recently tested CNT cathodes both with DC and RF fields. We observed a beam current close to 1A with a ~1cm2 CNT cathode inside an L-band RF gun. Steady operation was obtained up to 650 mA and the measured current vs. surface field plot showed perfect agreement with the Fowler-Nordheim distribution. 		 
slides icon Slides WEAD2 [10.445 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEAD2  
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WEPWI042 A Table-Top Alpha-Magnet 3584
 
  • A.V. Smirnov, R.B. Agustsson, T.J. Campese, Y.C. Chen, J.J. Hartzell, F.H. O'Shea, E. Spranza
    RadiaBeam, Santa Monica, California, USA
  
  Funding: Department of Energy, contract# DE- SC-FOA-0000760
A compact electromagnetic alpha-magnet design, engineering, and operation are presented. Initially the magnet has been designed for a low-energy, laser-free, coherent Cherenkov THz-sub-THz source. The source is designed and engineered in RadiaBeam in collaboration with ANL and integrated into the Injector Test Stand (ITS) of the Advanced Photon Source. The magnet having 15 cm depth, 14” height, and up to 4 T/m gradient features a rectangular yoke, two on-axis coils, and substantially truncated, partially non-hyperbolic poles. The tapered vacuum chamber for the magnet includes a motorized scraper and means of optical control. The novel and inexpensive design can be applied in relatively small, a few MeV facilities, where weight and dimensions are limited including free electron lasers, far infrared sources, inverse Compton sources of ultra-bright hard X-rays, as well as beam instrumentation for microbunching and phase-space manipulation (e.g., magnetic compression combined with round-to-flat beam transformation). 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWI042  
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