Author: Fagerberg, G.
Paper Title Page
TUPOA47 Development of Short Undulators for Electron-Beam-Radiation Interaction Studies 380
 
  • P. Piot
    Fermilab, Batavia, Illinois, USA
  • M.B. Andorf, G. Fagerberg, M. Figora
    Northern Illinois University, DeKalb, Illinois, USA
  
  Funding: Work supported by the US DOE contract DE-SC0013761 with Northern Illinois University
Interaction of an electron beam with external field or its own radiation has widespread applications ranging from coherent radiation generation, phase space cooling or formation of time-structured beam. An efficient coupling mechanism between an electron beam and radiation field relies on the use of a magnetic undulator. In this contribution we detail the construction and magnetic measurements of short (11 period) undulators with 7-cm period built using parts of the ALADDIN U3 undulator*. Possible use of these undulators at two accelerator test facilities to support experiment relevant to cooling techniques and radiation souces are discussed.
* F. C. Younger, W. Jorge Pearce, B. Ng, Nucl. Instrum. Meth Phys. Res. A 347, pp. 96-101 (1994). 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-TUPOA47  
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WEPOA40 Construction Status of a RF-Injector with a CNT-Tip Cathode for High Brightness Field-Emission Tests 785
 
  • Y.-M. Shin, G. Fagerberg, M. Figora
    Northern Illinois University, DeKalb, Illinois, USA
  • A.T. Green
    Northern Illinois Univerity, DeKalb, Illinois, USA
  
  We have been constructing a S-band RF-injector system for field-emission tests of a CNT-tip cathode. A pulsed S­band klystron is installed and fully commissioned with 5.5 MW peak power in a 2.5 micro­second pulse length and 1 Hz repetition rate. A single-cell RF­gun is designed to produce with 0.5 - ­ 1 pC electron bunches in a photo-emission mode within a 50 fs­ - 3 ps at 0.5-­ 1 MeV. The measured RF system jitters are within 1 % in magnitude and 0.2° in phase, which would induce 3.4 keV and 0.25 keV of energy jitters, corresponding to 80 fs and 5 fs of temporal jitters, respectively. Our PIC simulations indicate that the designed bunch compressor reduces the TOA­jitter by about an order of magnitude. Emission current and beam brightness of the field-emitted beam are improved by implanting CNT tips on the cathode surface, since they reduce the emission area, while providing high current emission. Once the system is completely commissioned in field-emission mode, the CNT-tip cathode will be tested in terms of klystron-power levels to map out its I-V characteristics under pulse emission condition.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA40  
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