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Semenov, A.

Paper Title Page
WEPEA021 Observation of Bursting Behavior Using Multiturn Measurements at ANKA 2526
 
  • V. Judin, S. Hillenbrand, N. Hiller, A. Hofmann, E. Huttel, M. Klein, S. Marsching, A.-S. Müller, N.J. Smale, K.G. Sonnad, P.F. Tavares
    KIT, Karlsruhe
  • H.W. Huebers
    Technische Universität Berlin, Berlin
  • A. Semenov
    DLR, Berlin
  
 

Since a few years CSR-Ra­di­a­tion cre­at­ed in low alpha mode is pro­vid­ed by the ANKA light source of the KIT*. De­pend­ing on the bunch cur­rent, the ra­di­a­tion is emit­ted in bursts of high in­ten­si­ty. These bursts dis­play a time evo­lu­tion which can be ob­served only on long time scales with re­spect to the rev­o­lu­tion pe­ri­od. The in­ten­si­ty of the emit­ted ra­di­a­tion dur­ing a burst is sig­nif­i­cant­ly in­creased w.r.t. steady state emis­sion. Some users of the THz ra­di­a­tion don't re­quire par­tic­u­lar­ly con­stant emis­sion char­ac­ter­is­tics and could prof­it from the high­er in­ten­si­ty. A bet­ter un­der­stand­ing of the long term be­haviour of those bursts could help to im­prove the con­di­tions for those users. We have in­ves­ti­gat­ed THz ra­di­a­tion in mul­ti­turn mode with a hot elec­tron bolome­ter. Its time re­sponse of 165ps al­lowed us to re­solve the sig­nals of in­di­vid­u­al bunch­es. Using a 6GHz LeCroy os­cil­lo­scope for data ac­qui­si­tion, we were able to save up to 1.6ms long sig­nal se­quences at a sam­pling rate of 20GS/s. This amount of data cor­re­sponds to over 4000 bunch rev­o­lu­tions and al­lows turn-by-turn sig­nal track­ing of de­sired bunch­es. In sin­gle bunch mode we are able to take seg­ment­ed data to avoid a huge over­head.


* KIT - Karlsruhe Institute for Technology

  
WEPEA022 Studies of Polarisaion of Coherent THz Edge Radiation at the ANKA Storage Ring 2529
 
  • A.-S. Müller, I. Birkel, M. Fitterer, S. Hillenbrand, N. Hiller, A. Hofmann, E. Huttel, K.S. Ilin, V. Judin, M. Klein, S. Marsching, Y.-L. Mathis, P. Rieger, M. Siegel, N.J. Smale, K.G. Sonnad, P.F. Tavares
    KIT, Karlsruhe
  • H.W. Huebers
    Technische Universität Berlin, Berlin
  • A. Semenov
    DLR, Berlin
  
 

In syn­chrotron ra­di­a­tion sources co­her­ent ra­di­a­tion is emit­ted when the bunch length is com­pa­ra­ble to or short­er than the wave­length of the emit­ted ra­di­a­tion. At the ANKA stor­age ring this ra­di­a­tion is ob­served as so-called edge ra­di­a­tion (emit­ted in the fringe field of a bend­ing mag­net). This ra­di­a­tion ex­hibits a ra­di­al po­lar­i­sa­tion pat­tern. The ob­served pat­tern, how­ev­er, is in­flu­enced by the ra­di­a­tion trans­port in the beam line. A de­tec­tor sys­tem based on a su­per­con­duct­ing NbN ul­tra-fast bolome­ter with an in­trin­sic re­sponse time of about 100 ps as well as con­ven­tion­al Si bolome­ters were used to study the beam po­lar­i­saion. This paper re­ports the ob­ser­va­tions made dur­ing mea­sure­ments.