Author: Roensch-Schulenburg, J.    [Rönsch-Schulenburg, J.]
Paper Title Page
TUPAB086 FLASH2020+ Plans for a New Coherent Source at DESY 1581
 
  • E. Allaria, N. Baboi, K. Baev, M. Beye, G. Brenner, F. Christie, C. Gerth, I. Hartl, K. Honkavaara, B. Manschwetus, J. Mueller-Dieckmann, R. Pan, E. Plönjes-Palm, O. Rasmussen, J. Rönsch-Schulenburg, L. Schaper, E. Schneidmiller, S. Schreiber, K.I. Tiedtke, M. Tischer, S. Toleikis, R. Treusch, M. Vogt, L. Winkelmann, M.V. Yurkov, J. Zemella
    DESY, Hamburg, Germany
 
  With FLASH2020+, a major up­grade of the FLASH fa­cil­ity has started to meet the new re­quire­ments of the grow­ing soft-x ray user com­mu­nity. The de­sign of the FEL beam­lines aims at pho­ton prop­er­ties suit­able to the needs of fu­ture user ex­per­i­ments with high rep­e­ti­tion rate XUV and soft X-ray ra­di­a­tion. By the end of the pro­ject, both ex­ist­ing FEL lines at FLASH will be equipped with fully tun­able un­du­la­tors ca­pa­ble of de­liv­er­ing pho­ton pulses with vari­able po­lar­iza­tion. The use of the ex­ter­nal seed­ing at 1 MHz in burst mode is part of the de­sign of the new FLASH1 beam­line, while FLASH2 will ex­ploit novel las­ing con­cepts based on dif­fer­ent un­du­la­tor con­fig­u­ra­tions. The new FLASH2020+ will rely on an elec­tron beam en­ergy of 1.35 GeV that will ex­tend the ac­ces­si­ble wave­length range to the oxy­gen K-edge with vari­able po­lar­iza­tion. The fa­cil­ity will be com­pleted with new laser sources for pump and probe ex­per­i­ment and new ex­per­i­men­tal sta­tions.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB086  
About • paper received ※ 19 May 2021       paper accepted ※ 27 May 2021       issue date ※ 23 August 2021  
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TUPAB104 Redesign of the FLASH2 Post-SASE Undulator Beamline 1626
 
  • F. Christie, J. Rönsch-Schulenburg, S. Schreiber, M. Vogt, J. Zemella
    DESY, Hamburg, Germany
 
  FLASH2 is one of the two SASE (Self-Am­pli­fied Spon­ta­neous Emis­sion) un­du­la­tor beam­lines lines com­pris­ing vari­able gap un­du­la­tors to pro­duce ra­di­a­tion in the XUV and soft X-ray regime at FLASH. Down­stream of the SASE un­du­la­tors the beam­line is cur­rently un­der­go­ing a major re­design. Dur­ing shut­downs in sum­mer 2020 and win­ter 2021 two Po­lariX TDSs (Po­lar­iz­able X-band Trans­verse De­flect­ing Struc­ture) were in­stalled, as well as ad­di­tional di­ag­nos­tics, to mon­i­tor the lon­gi­tu­di­nal phase space den­sity of the elec­tron bunches. Ad­di­tion­ally, an af­ter­burner un­du­la­tor will be in­te­grated in the next shut­down to pro­duce cir­cu­larly po­lar­ized light with wave­lengths down to 1.39 nm. In this paper, we will pre­sent the mod­i­fi­ca­tions that were and will be made to the elec­tron beam­line in the course of this re­design.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB104  
About • paper received ※ 19 May 2021       paper accepted ※ 21 July 2021       issue date ※ 23 August 2021  
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TUPAB115 Status Report of the Superconducting Free-Electron Laser FLASH at DESY 1659
 
  • J. Rönsch-Schulenburg, F. Christie, K. Honkavaara, M. Kuhlmann, S. Schreiber, R. Treusch, M. Vogt, J. Zemella
    DESY, Hamburg, Germany
 
  The free-elec­tron laser in Ham­burg (FLASH) is a high bril­liance XUV and soft X-ray SASE FEL user-fa­cil­ity at DESY. FLASH’s su­per­con­duct­ing linac can ac­cel­er­ate sev­eral thou­sand elec­tron bunches per sec­ond in 10 Hz bursts of up to 800 µs length. The long bunch trains can be split in two parts and shared be­tween two un­du­la­tor beam­lines. Dur­ing 2020, FLASH sup­plied, in stan­dard op­er­a­tion, up to 500 bunches at 10 Hz in two bunch trains with in­de­pen­dent fill pat­terns and com­pres­sion schemes. The FLASH2 un­du­la­tor beam­line com­prises vari­able gap un­du­la­tors that allow dif­fer­ent novel las­ing schemes. A third beam­line ac­com­mo­dates the FLASH­For­ward plasma wake­field ac­cel­er­a­tion ex­per­i­ment. We re­port on the FLASH op­er­a­tion in 2019 - 2021 and pre­sent a few high­lights.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB115  
About • paper received ※ 19 May 2021       paper accepted ※ 21 June 2021       issue date ※ 19 August 2021  
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