Comissioning of the IR beamline at FLASH. DESY.DE

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Christal Holmes
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1 Comissioning of the IR beamline at FLASH DESY.DE

2 IR Undulator Beamline at FLASH First light 2

3 FLASH experimental hall before installation of IR beamline BL1 PG2 BL2 BL3 fs Laser 3

4 FLASH experimental hall NOW! BL3 BL2 BL1 PG2 fs Laser FIR beamline 4

5 IR Undulator Beamline at FLASH First light 5

Layout: Source Undulator parameters*: type: planar electromagnetic undulator Gap: 40 mm Period length: 400 mm Number of periods: 9 K-value3 49 Undulator performance: naturally synchronized to VUV

6 Layout: Source Undulator parameters*: type: planar electromagnetic undulator Gap: 40 mm Period length: 400 mm Number of periods: 9 K-value3 49 Undulator performance: naturally synchronized to VUV pulse pulse energy: more than 10 μj spectral range tunable from 10 to 200 μm (possibly shorter) pulse duration 0.3 to 6 ps *More information: V. Borisov, Proceedings of EPAC 2006, Edinburgh, June 2006, p.3595.; O. Grimm, Proceedings of FEL 2007, Novosibirsk, to be published 6

7 Layout: Source pulse duration pulse energy courtesy of O. Grimm [1] W. Ackermann et. al., Nature Photonics 1 (2007) NIR content? -> FIR undulator counts presently as class 4 source, can be Worked only in dedicted shifts (study time!) 7

8 Layout: photon transport requirements: spectral range: 1! 200 μm timestructure/wavefront needs to be transported! spatial and temporal overlap with VUV pulse from same electron bunch -> upper limit for length! FLASH experimental hall Accelerator tunnel VUV IR PETRA tunnel 8

9 Layout: photon transport requirements: spectral range: 1! 200 μm FLASH experimental hall timestructure/wavefront needs to be transported! spatial and temporal overlap with VUV pulse from same electron bunch -> upper limit for length! -> 63 m beamline -> 7 focussing mirrors Accelerator tunnel -> 8 planar mirrors Needed to be completed by end of shutdown 07/2007 -> 9 mirror chambers VUV IR PETRA tunnel 9

10 λ = 100 μm Layout: photon transport top view: T1 f= 8000 mm T2 f=13000 mm T4 f=4000 mm D M4 M5 M6 M8 560 (y) M1 F - Pipe M3 FIR - Pipe PETRA S - Pipe T3 f= 6000 mm T6 (delay) T5 f=4000 mm f=2000 mm M7 sample P1 f=150 Evaluation with THz Transport* & ZEMAX using Gaussian beams and numerical sources Source T1 T2 T3 T4 Diamond window T5 T6 * THztransport.m 10

11 Layout: beamline - accelerator tunnel synchrotron beam ( streak camera) VUV beam FIR beam M1 Boundary conditions: 1. Parasitic use to normal FLASH operation -> 4 x 10kg mirrors need to be moved in and out of the beampipe on short notice and precisely 2. Use existing vacuum pipe through PETRA storage ring m beampipe in particlefree UHV! 11

12 Layout: beamline - outcoupling synchrotron beam ( visible) FIR beam VUV beam M1 VUV Synchrotron (visible) FIR 12

13 Layout: beamline - experimental hall close to completion! Pump-Probe Exp. VUV beamline BL3 Optical delay chamber Photondiagnostic Station same image than in pump probe exp.! Electrondiagnostic Station (U HH) from 05/

14 Layout: beamline - experimental hall Photondiagnostic shift on Completed at time of measurement

15 IR Undulator Beamline at FLASH First light 15

16 provisonal experimental station diagnostic port 3 completed just in time for shift! 16

17 provisonal experimental station completed just in time for shift! 17

18 635 mm First light: beam profile P1 P2 290 mm 350 mm P1: f= 290 mm P2: f= 350 mm P3: f= 250 mm 600mm 385 mm SPIRICON Filter 250 mm periscope 200 mm P3 18

19 First light: beam profile/filter measurements full beam 100 μm band pass filter system 15 % of intensity 19

20 First light: beam profile/filter measurements calculation 100 μm band pass filter system 3THz, γ= at aperture r= 6.3 mm unblocked I=

21 First light: beam profile/filter measurements 70 μm 75 μm 80 μm 85 μm 90 μm 95 μm 100 μm 104 μm Pointing stability OK? 21

22 First light: beam profile/filter measurments 70 μm 75 μm 80 μm 85 μm "transmission" μm 95 μm 100 μm 104 μm Exp wavelength/μm filter curve from QMC M. Gensch et. al. 22

23 First light: spectral diagnostics P1 P2 290 mm 350 mm Spectrometer P1: f= 290 mm P2: f= 350 mm P3: f= 190 mm P4/P5: f= mm 600mm 385 mm 635 mm P4 P5 D 190 mm D: pyro + PE window 500 mm P3 23

24 First light: spectral diagnostics tuned to 60 μm tuned to 70 μm intensity/a.u M. Gensch et. al wavelength/μm 24

25 First light: spectral diagnostics tuned to 60 μm tuned to 70 μm intensity/a.u transmission of humide air M. Gensch et. al wavelength/μm 25

26 3rd harmonic? First light: spectral diagnostics intensity/a.u raw data transmission of humide air M. Gensch et. al. fundamental wavelength/μm 26

27 First light: spectral diagnostics with correction: 1. for instrument function intensity/a.u. M. Gensch et. al. + for comparison of spectral contents -> purged set up needed wavelength/μm 2..different assumed water vapor contents intensity/a.u. M. Gensch et. al. intensity/a.u. M. Gensch et. al wavelength/μm wavelength/μm 27

28 First light: power measurements P1 290 mm 350 mm P1: f= 290 mm P2: f= 350 mm P3: f= 200 mm P3 P2 180 mm Filter 200 mm Powermeter 0 bunches -> 1.5 μw full beam 0.5 μw with filter Calibration measurement before each measurement (filter produces 30 μw) 28

29 First light: power measurements with 100 μm band pass filter power/μw linear! M. Gensch et. al number of bunches 5 bunches/s = 9 μw -> (1.8 +/- 0.3) μj pulse energy? 29

30 First light: power measurements intensity/μw with filter linear! number of bunches M. Gensch et. al. intensity/μw full beam nonlinear! number of bunches M. Gensch et. al. 30

31 First light: power measurements optimum SASE! power/μw M. Gensch et. al phase/ 31

32 First light: time structure P1 290 mm 350 mm P1: f= 290 mm P2: f= 350 mm P3: f= 200 mm P3 P2 180 mm 200 mm Hot electron Bolometer pulse duration < 180 ps established 32

33 First light: Summary Measurement of: Beamprofile: close to simulation, slightly elliptically Power: calibration under way, μj Level??? Spectral content: fundamental shifted by 5 10 micrometers Timestructure: sub ns established (present limit of detection) -> next shifts end of january! -> photondiagnostic collaboration established 33

34 Photondiagnostic collaboration for the FIR undulator beamline at FLASH Goal: gather expertise and equipment to perform source and beamline diagnostic during comissioning of the beamline develope dedicated (ONLINE) photondiagnostic for the user facility Members (so far): M. Gensch, M. Yurkov, E. Schneidmiller, U. Fruehling, E. Saldin, V. Kocharyan (DESY), Wolfgang Seidel (FZ Rossendorf), Ullrich Schade, Jongseok Lee (BESSY), Heinz-Wilhelm Hübers, Alexei Semenov (DLR) 34

35 Next steps 01/2008 -Completion of FIR beamline Development of ONLINE photondiagnostic - Comissioning of FIR beamline - (Pilot) VUV IR pump probe experiments 2009 if approved: -> establish FIR beamline as optional user facility for pump probe experiments at FLASH 35

Outlook 2009: user facility for VUV/IR pump probe experiments foreseen photondiagnostic: Single shot spectrometer } Single shot E/O, spatial decoding ONLINE!

36 Outlook 2009: user facility for VUV/IR pump probe experiments foreseen photondiagnostic: Single shot spectrometer } Single shot E/O, spatial decoding ONLINE!? Single shot beam profile IR - FIR Powermeter (currently under development in collaboration with external groups: ELBE, DLR,BESSY, PTB) VUV beamline 3 Optical delay IR beamline VUV/IR pump-probe experimental station Photondiagnostic station: -> same image as in experiment! 36

37 Comissioning of the IR beamline at FLASH THANK YOU! DESY.DE

XUV pulse FLASH

XUV pulse FLASH W (GW) XUV pulse duration @ FLASH 50 85µm with bandpass filter 55 60 Kinetic Energy [ev] 65 70 75 80 85 90 95 100 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Delay [ps] 80 60 40 20 0 0 50 100 150 200 250 300 t (fs)