Author: Mai, C.
Paper Title Page
MOPAB294 Implementing Electro-Optical Diagnostics for Measuring the CSR Far-Field at KARA 931
 
  • C. Widmann, E. Bründermann, M. Caselle, S. Funkner, A.-S. Müller, M.J. Nasse, G. Niehues, M.M. Patil, C. Sax, J.L. Steinmann, M. Weber
    KIT, Karlsruhe, Germany
  • C. Mai
    DELTA, Dortmund, Germany
  
  Funding: This work was supported by BMBF ErUM-Pro project 05K19 STARTRAC, C.W. was funded under contract No. 05K19VDK, C.M. under contract No. 05K19PEC, S.F. under contract No. 05K16VKA.
For mea­sur­ing the tem­po­ral pro­file of the co­her­ent syn­chro­tron ra­di­a­tion (CSR) at the KIT stor­age ring KARA (Karl­sruhe Re­search Ac­cel­er­a­tor) an ex­per­i­men­tal setup based on elec­tro-op­ti­cal spec­tral de­cod­ing (EOSD) is cur­rently being im­ple­mented. The EOSD tech­nique al­lows sin­gle-shot, phase-sen­si­tive mea­sure­ments of the far-field ra­di­a­tion on a turn-by-turn basis at rates in the MHz range. There­fore, the re­sult­ing THz ra­di­a­tion from the dy­nam­ics of the bunch evo­lu­tion, e.g. the mi­crobunch­ing, can be ob­served with high tem­po­ral res­o­lu­tion. This far-field setup is part of the dis­trib­uted sen­sor net­work at KARA. Ad­di­tion­ally to the in­for­ma­tion ac­quired from the near-field EOSD spec­tral de­cod­ing and the hor­i­zon­tal bunch pro­file mon­i­tor, it en­ables to mon­i­tor the lon­gi­tu­di­nal phase-space of the bunch. In this con­tri­bu­tion, the char­ac­ter­i­za­tion of the far-field setup is sum­ma­rized and its im­ple­men­ta­tion is dis­cussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB294  
About • paper received ※ 19 May 2021       paper accepted ※ 07 June 2021       issue date ※ 18 August 2021  
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TUPAB066 Status of the Short-Pulse Source at DELTA 1518
 
  • A. Held, B. Büsing, H. Kaiser, S. Khan, D. Krieg, A.R. Krishnan, C. Mai
    DELTA, Dortmund, Germany
  
  Funding: Work supported by BMBF (05K19PEB).
At the syn­chro­tron light source DELTA op­er­ated by the TU Dort­mund Uni­ver­sity, the short-pulse source em­ploys the seed­ing scheme co­her­ent har­monic gen­er­a­tion (CHG) and pro­vides ul­tra­short pulses in the vac­uum ul­tra­vi­o­let and ter­a­hertz regime. Here, the in­ter­ac­tion of laser pulses with the stored elec­tron bunches re­sult in a mod­u­la­tion of the lon­gi­tu­di­nal elec­tron den­sity which gives rise to co­her­ent emis­sion at har­mon­ics of the laser wave­length. Re­cently, in­ves­ti­ga­tions of the in­flu­ence of the Gouy phase shift at the focal point of the laser pulses on the laser-elec­tron in­ter­ac­tion have been per­formed. For the planned up­grade to­wards the more so­phis­ti­cated seed­ing scheme echo-en­abled har­monic gen­er­a­tion (EEHG) fea­tur­ing a twofold laser-elec­tron in­ter­ac­tion, sim­u­la­tions of the ideal pa­ra­me­ters of the laser beams have been car­ried out. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB066  
About • paper received ※ 19 May 2021       paper accepted ※ 22 July 2021       issue date ※ 28 August 2021  
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WEPAB079 Optics Studies on the Operation of a New Wiggler and Bunch Shortening at the DELTA Storage Ring 2772
 
  • B. Büsing, P. Hartmann, A. Held, S. Khan, C. Mai, D. Schirmer, G. Schmidt
    DELTA, Dortmund, Germany
  
  Funding: Work supported by Deutsche Forschungsgemeinschaft via project INST 212/330-1 AOBJ: 619186
The 1.5-GeV elec­tron stor­age ring DELTA is a syn­chro­tron light source op­er­ated by the TU Dort­mund Uni­ver­sity. Ra­di­a­tion from hard X-rays to the THz regime is pro­vided by di­pole mag­nets and in­ser­tion de­vices like un­du­la­tors and wig­glers. To pro­vide even shorter wave­lengths, a new 22-pole su­per­con­duct­ing 7-T wig­gler has been in­stalled. The edge fo­cus­ing of the wig­gler has a large im­pact on the lin­ear op­tics of the stor­age ring. Mea­sure­ments re­gard­ing its in­flu­ence and sim­u­la­tions were per­formed. In ad­di­tion, a sec­ond ra­diofre­quency (RF) cav­ity has been in­stalled to com­pen­sate the in­creased en­ergy loss per turn due to the new wig­gler. As a con­se­quence of the higher RF power, the elec­tron bunches are shorter com­pared to the old setup with only one cav­ity. In view of re­duc­ing the bunch length even more, stud­ies of the stor­age ring op­tics with re­duced mo­men­tum com­paction fac­tor were per­formed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB079  
About • paper received ※ 19 May 2021       paper accepted ※ 24 June 2021       issue date ※ 01 September 2021  
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THPAB097 Towards Arbitrary Pulse Shapes in the Terahertz Domain 3977
 
  • C. Mai, B. Büsing, A. Held, S. Khan, D. Krieg
    DELTA, Dortmund, Germany
  
  Funding: Work supported by the BMBF (05K19PEC).
The TU Dort­mund Uni­ver­sity op­er­ates the 1.5-GeV elec­tron stor­age ring DELTA as a syn­chro­tron light source in user op­er­a­tion and for ac­cer­era­tor physics re­search. At a ded­i­cated beam­line, ex­per­i­ments with (sub-)THz ra­di­a­tion are car­ried out. Here, an in­ter­ac­tion of short laser pulses with elec­tron bunches is used to mod­u­late the elec­tron en­ergy which causes the for­ma­tion of a dip in the lon­gi­tu­di­nal elec­tron den­sity, giv­ing rise to the co­her­ent emis­sion of ra­di­a­tion be­tween 75 GHz and 6 THz. The stan­dard mode of op­er­a­tion is the gen­er­a­tion of broad­band ra­di­a­tion. How­ever, more so­phis­ti­cated en­ergy mod­u­la­tion schemes were im­ple­mented using a liq­uid-crys­tal phase mod­u­la­tor. Here, a mod­u­la­tion of the spec­tral phase of the laser is used to con­trol the spec­tral shape of the THz pulses. The re­sult­ing THz spec­tra have a rel­a­tive band­width of about 2 %. Mea­sure­ment re­sults from the dif­fer­ent THz gen­er­a­tion schemes are pre­sented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB097  
About • paper received ※ 18 May 2021       paper accepted ※ 12 July 2021       issue date ※ 24 August 2021  
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