Author: Baryshev, S.V.
Paper Title Page
TUPMA042 THz Radiation Generation in a Multimode Wakefield Structure 1929
 
  • S.P. Antipov, S.V. Baryshev, C.-J. Jing, A. Kanareykin
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • M.G. Fedurin
    BNL, Upton, Long Island, New York, USA
  • W. Gai, D. Wang, A. Zholents
    ANL, Argonne, Ilinois, USA
  
  Funding: Work supported by the Department of Energy SBIR program under Contract #DE-SC0009571
A number of methods for producing sub-picosecond beam microbunching have been developed in recent years. A train of these bunches is capable of generating THz radiation via multiple mechanisms like transition, Cherenkov and undulator radiation. We utilize a bunch train with tunable spacing to selectively excite high order TM0n - like modes in a multimode structure. In this paper we present experimental results obtained at the Accelerator Test Facility of Brookhaven National Laboratory. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPMA042  
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TUPMA043 Experimental Test of Semiconductor Dechirper 1932
 
  • S.P. Antipov, S.V. Baryshev, C.-J. Jing, A. Kanareykin
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • S. Baturin
    LETI, Saint-Petersburg, Russia
  • M.G. Fedurin, K. Kusche, C. Swinson
    BNL, Upton, Long Island, New York, USA
  • W. Gai, S. Stoupin, A. Zholents
    ANL, Argonne, Illinois, USA
  
  Funding: Work supported by the Department of Energy SBIR program under Contract #DE-SC0006299
We report the observation of de-chirping of a linearly chirped (in energy) electron bunch by its passage through a 4 inch long rectangular waveguide loaded with two silicon bars 0.25 inch thick and 0.5 inch wide. Silicon being a semiconductor has a conductivity that allows it to drain the charge fast in case if some electrons get intercepted by the dechirper. At the same time the conductivity is low enough for the skin depth to be large (on the order of 1 cm) making the silicon loaded waveguide a slow wave structure supporting wakefields that dechirp the beam. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPMA043  
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WEPMN015 Dark Current Imaging Experiment in an L-band RF Gun 2952
 
  • J.H. Shao, H.B. Chen, J. Shi, D. Wang
    TUB, Beijing, People's Republic of China
  • S.P. Antipov, S.V. Baryshev, C.-J. Jing, J.Q. Qiu
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • M.E. Conde, D.S. Doran, W. Gai, W. Liu, J.G. Power, C. Whiteford, E.E. Wisniewski
    ANL, Argonne, Illinois, USA
  • F.Y. Wang, L. Xiao
    SLAC, Menlo Park, California, USA
  
  The localized high electric field enhancement or low work function is the trigger for strong field emission, which however has yet been well experimentally studied. Using an L-band photocathode gun test stand at Argonne Wakefield Accelerator Facility (AWA), we’ve constructed an imaging beam line to observe field emission current from predefined emitters on cathode. Preliminary experiment results are present. Future plan is discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN015  
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WEPMN016 Observation of Dark Current Dependence on Stored Energy in an L-Band RF Gun 2956
 
  • J.H. Shao, H.B. Chen, J. Shi, D. Wang
    TUB, Beijing, People's Republic of China
  • S.P. Antipov, S.V. Baryshev, C.-J. Jing, J.Q. Qiu
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • M.E. Conde, D.S. Doran, W. Gai, W. Liu, J.G. Power, C. Whiteford, E.E. Wisniewski
    ANL, Argonne, Illinois, USA
  • F.Y. Wang, L. Xiao
    SLAC, Menlo Park, California, USA
  
  A pin cathode has been installed into an L-band photocathode gun to study the influence of stored energy on field emission. The stored energy was varied by tuning the recess of the cathode in order to have the same E-field on the cathode tip. We have observed 5 times difference of dark current level at the same E-field, while by varying the stored energy by three fold. Dynamics study reveals the difference is not caused by transmission, but by emission process itself. We'll present experiment results and discuss possible mechanisms about the phenomena.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN016  
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