TTF2 (TESLA Test Facility, Phase 2) VUV FEL (Vacuum-Ultraviolet Free-Electron Laser)

Transcription

1 DESY MAC Meeting 9. Nov TTF2 (TESLA Test Facility, Phase 2) VUV FEL (Vacuum-Ultraviolet Free-Electron Laser) Overview and Status Jörg Rossbach 1

2 Overview BC 3 BC 2 Injector 3 LOLA 260 m 2

3 TTF External Contributions to Installation and Operation Installation Operation DESY Coord. Cathodes Accel.Modules INFN Milano Cathodes INFN Milano Schreiber RF Gun / Cryogenics RF Modulators FNAL Freq.Tuner BPMs / HOM Studies CE Saclay Lange Nölle / Baboi Freq.Tuner BPMs CE Saclay Transverse deflecting cavity LOLA SLAC Schlarb Klose Transverse deflecting cavity LOLA SLAC OTR Diagnostics INFN Frascati Honkavaara OTR Diagnostics INFN Frascati Gun Laser MBI Schreiber Gun Laser MBI LLRF Warsaw Univ. Ayvazyan Simrock Ctrls YerPhi Ayvazyan Rehlich Ctrls ITEP Moscow Univ. Rehlich 3 additional manpower RF Protvino Choroba

4 New Partners 2 Helmholtz Virtual Research Centers : 1. Electron guns 2. Advanced beam diagnostics EU Infrastructure Programme: 1. EUROFEL 2. CARE 3. Synchrotron Radiation I3 Several more under progress 4

5 VUV FEL beam parameters VUV 6 nm (1 GeV) Normalized emittance from injector (1 nc) Norm. emittance at undulator entrance Beam size in undulator Bunch length (rms) Peak current Long. emittance σ E σ l 1.2 mrad mm 2 mrad mm 65 µm 150 fs 2500 A 40 mm kev 5

6 TTF2 Time Structure Repetition rate Macro-pulse <I> within pulse train max. 9 ma Duty cycle ~ 0.8% 100ms I 800µs macro-pulse I peak ~ 2.5 ka t Bunch I µs bunch spacing t Slice I 2-5 ka 1 nc 100 fs ~ ps Slice ~ e.g. 10 fs t Without 3 rd harm. cav. 6

7 The TTF with its VUV FEL is a new type of FEL radiation user facility an FEL research machine a test-bed for s.c. linac technology a prototype for the European XFEL Consequence: TTF needs several stages for electron beam manipulation and full control of beam parameters during all of these stages. flexible optics lattice, thus many quadrupole magnets and power supplies lots of beam diagnostics high density of special components Machine characteristics VUV FEL is not suited to estimate XFEL or ILC costs&efforts just by scaling length or beam energy! 7

8 Priorities and Milestones Due to unexpected financial restrictions some major cost driving components needed to be delayed. necessary to re-define priorities. Decision: delay power supplies cabling long bunch train issues Milestones: 1: Injector commissioning up to ACC2 2: Complete vacuum system 3: FEL commissioning at ~30nm wavelength with single bunch 4: Full bunch train operation 8

9 TTF2 Schedule of the last year now commissioning complete accelerator end shutdown survey of components and final alignment installation of remaining components (diagnostics,cables,container,ps,interlock,photon beamline) commissioning injector survey of magnets end vacuum installation installation of injector installation of gun start vacuum installation incl. module processing incl. module installation & all magnets 9

10 Overview and Status Progress since June 2003: Machine completely installed, vacuum closed Injector commissioned up to ACC2; emittance ok for 30 nm Commissioning of entire machine started 1. Sept Accumulated delay of ~ 3 months w.r.t. June 2003 TTF2 installation schedule contained ~ 450 topics Talk by M. Körfer 10

11 Injector General concept: 1. Full performance test of gun components at PITZ/Zeuthen Zeuthen 2. Installation at TTF Present TTF gun: First emittance measurement (vert( vert.) at ~100 MeV,, no compression Laser spot on cathode: σx = 0.51 ± 0.02 mm x,mm y,mm σy = 0.62 ± 0.02 mm Test at PITZ: ε = 1.7 π mm mrad downstream BC2: ε 3 π mm mrad Compression by BC2 cleary observed No quantitative measurement yet

12 Injector Improvement plans: 1. Transversely homogenous laser spot on cathode 2. Longitudinal flat top profile 3. Increase electric field on cathode First test at PITZ: σx = 0.57 ± 0.02 mm x,mm 1 3 ε x = 1.9 π mm mrad ε y = 1.3 π mm mrad 2 σy = 0.58 ± 0.02 mm 1 y,mm Talk by M. Krassilnikov 12

13 Tunnel layout: Concept and Experience Intention: tunnel design prototyping TESLA tunnel 32 Container Experience: + cabling is less time consuming + short cable length - bad cable tray access below walkway - time consuming cabling beside the containers -For TTF2: container more expensive than standard racks Conclusion for TESLA & XFEL: different tunnel layout; Conclusion for ILC: tbd 13 tbd; ; experience and numbers available

14 Mechanical Design Tools: Full 3D representation 14

15 Vacuum All vacuum chambers particle free installed using local clean rooms BC 3 BC 2 15

16 Electron beam diagnostics Charge Monitors Toroids: : available + Screens OTR s installed & commissioned + BPMs all BPMs installed and cabled + but only 20 Read out Electronics available Problem: delivery of milled rf-housing and availability of rf connectors -- connectors -- BPMs at Strategic Positions : -- - Injector: Full Instrumentation - BC3: 2 BPMs Up- and Downstream - LOLA: 2 BPMs - Bypass Line: 2 BPMs - Dump Line: 1 BPM... and much more beam diagnostics talk by Dirk Noelle New Generation of BPM Electronics available by End of

17 Schedules Task Milestone Milestone (as of ) Milestone (rev. Jan 2004) Milestone ( ) Commissioning of accelerating modules ACC 3,4,5 incl. proof of max. gradient Modules commissioned Vacuum system entire machine Vacuum closed xx Commissioning injector up to ACC2 incl. commissioning modules ACC1 and ACC2 First beam up to ACC mid of Febr Installation of remaining components Commissioning entire machine, except for collimator and undulator Commissioning of collimator and undulator beamline all installations completed First beam through bypass into dump First beam through undulator into dump (except PS & BPMs) end of end of Commissioning photon diagnostics in the tunnel Beam intensity and spectrum of spontaneous radiation end of

18 Schedules Major reasons for delay w.r.t. schedule of August 2003: Magnetic shielding of ACC1 cavities re-fabricated 2 times More time needed for installation beyond vacuum (e.g. cabling, container), partially due to conflicts with HERA priority 4 weeks 4 weeks Severe delay of PSs: : late order due to financial restrictions + company went bankrupt no beam through bypass before end of Oct weeks 18

19 Allocation of responsibilities: Hardware work packages (almost unchanged since 2001): 19 Zuständigkeiten TTF2 Kryogenik Magnete Umbau, Einbau, Montage Kollimator allg. Kollimator Vakuum Diagnostik Bunch compressor 3 allg. Bunch compressor 3 Vakuum Zwischen-und Ersatzbeaml. Bypass Undulator Vermessung Uebersichtszeichnungen Spektrometer+Dump Injektor III allg. Injektor III Vakuum RF gun + laser TESLA Module Undul.kammer + Zwischenst. Kontrollen Wasser und Strom RF Versorgung Feedback Cavities Koppler Magnet-Netzger Netzgerätete Koordination Vakuum Kabel Gestelle Personen-Interlock Technisches Interlock Photonen-Diagnose bernd.petersen@desy.de, bernward.krause@desy.de, burghard.sparr@desy.de, markus.koerfer@desy.de cornelius.martens@desy.de dirk.noelle@desy.de, frank.stulle@desy.de mike.seidel@desy.de hans-peter.wedekind@desy.de harder@ifh.de, joachim.pflueger@desy.de, johannes.prenting@desy.de, josef.gonschior@desy.de, michael.schmitz@desy.de, klaus.floettmann@desy.de, annette.brenger@desy.de siegfried.schreiber@desy.de bernd.petersen petersen@desy.de, ulrich.hahn@desy.de kay.rehlich@desy.de jens-peter.jensen@desy.de stefan.choroba@desy.de klaus.balewski@desy.de, dieter.proch@desy.de wolf-dietrich.moeller@desy.de hans-joerg.eckoldt@desy.de Kirsten.Zapfe@desy.de juergen.liebing@desy.de gabriele.weichert@desy.de dietrich.ramert@desy.de martin.staack@desy.de josef.feldhaus@desy.de

20 TTF / VUV-FEL Organigramm TESLA Collaboration Board DESY Directorate DESY TTF / VUV-FEL Coordination Board Chair: M Division Leader D. Trines Co-Chair: FS Division Leader J. Schneider Members: Project leader FEL technology J. Rossbach Project leader LINAC technology H. Weise Project leader photons J. Feldhaus FEL concepts M. Yurkov TESLA TEST Facility R&D coordinator C. Pagani Representative of V3 (PoF related issues) U. Wolframm DESY TTF / VUV-FEL Project Group Chair: Project leader FEL technology J. Rossbach Co-Chair: Project leader LINAC technology H. Weise Project leader photons J. Feldhaus Members: - people responsible for the individual work packages - members of the Coordination Board New International Collaborators 20 DESY technical/administrative groups Groups from TESLA Collaboration

21 TTF / VUV-FEL Commissioning VUV FEL responsibilities for commissioning procedures (13-August August-2004) Gun Operation llrf (FSM) llrf (closed loop) phase stability laser / RF water regulation; rf tune gun technical interlock gun dark current meas. laser beam line laser laser server laser controls streak camera laser cathode production Faraday cups toroids BPM collimator phase scan energy, energy spread beam based alignment bucking coil field envelope matching study effect of laser mirror wakefield effects quantum efficiency phase charge studies Ayvazyan Kotthaus Simrock Carneiro Schreiber Han Klose Schreiber Petrosyan Rehlich Schreiber Sertore Carneiro / Nölle Nölle Nölle Flöttmann Sertore Schlarb Krassilnikov Flöttmann Flöttmann Miltchev Kim Schreiber Sertore TTF Linac ACC1 ACC5 llrf Ayvazyan phase calibration Ayvazyan set-up nominal optics Castro magnets Castro OTR screens Honkavaara toroids Nölle BPMs Nölle wire scanners Werner beam loss detection Pugachov dark current transmission Flöttmann spot size and shapehonkavaara check envelope matching (inj( inj.) Flöttmann emittance measurement with screens Honkavaara bunch compressor 2 Kim beam with compression Limberg bunch length monitoring (pyro( pyro) Schlarb measurement beam energy Castro energy spread Schlarb compensate dispersion Golubeva streak camera (TOSY) Grimm IR interferometer Grimm velocity bunching Carneiro time-of of-flight flight (TOF) Kollewe measure phase stability Simrock final state machine LLRF Brandt establish golden orbit Castro module operation Kostin HOM studies Baboi Electron Beam Downstream of Linac ACC7 section: LOLA Ross / Klose LOLA Kicker Schlarb / Obier electro-optical optical sampling (EOS) Steffen timing meas. By EOS (TEO) Schlarb bunch compress. Meas.by CDR Schlarb dto.. By IR interferometer Grimm collimator Körfer orbit feedback Balewski establish bypass operation Castro beam diagnostics bypass Nölle undulator: beam losses in undulator Körfer / Pugatchov electron orbit / beam based alignm. Faatz wire scanners Sachwitz electron spectrometer / beam dump Schmitz Photon Beam Diagnostics intensity and spatial distribution MCP detectors HASYLAB systems spectral distribution dipole radiation, timing w/ respect to pump-probe probe laser FEL photon beam transfer Yurkov Treusch Tiedke Plönjes Tiedke 21

22 Summary Machine completely installed, vacuum closed Injector commissioned up to ACC2; emittance ok Commissioning of entire machine started 1. Sept Electron beam through bypass on beam dump 22