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FEE/FEL Commissioning Overview

FEE/FEL Commissioning Overview. By Hal Tompkins Photon Beam Systems Deputy Presentation to the Facility Advisory Committee June 16, 2008. Outline. Commission FEE Instruments Offset mirror commissioning SASE optimization AMO experiment alignment User Operations at ~4 GeV.

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FEE/FEL Commissioning Overview

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  1. FEE/FEL Commissioning Overview By Hal Tompkins Photon Beam Systems Deputy Presentation to the Facility Advisory Committee June 16, 2008

  2. Outline • Commission FEE Instruments • Offset mirror commissioning • SASE optimization • AMO experiment alignment • User Operations at ~4 GeV

  3. Related Presentations • Paul Emma, Commissioning Results and Plans • H.D. Nuhn, LTU and Undulator Commissioning Plans • Richard Bionta, FEE Diagnostics and Commissioning • John Bozek, AMO Instrument

  4. LCLS Installation and Commissioning Time-Line First Light in FEE First Light in FEH PPS Cert. LTU/Dump LTU/Und/Dump Install CD-4 (7/31/2010) X-Rays in NEH FEE/NEH Install FEH Hutch BO FEH Install PEP-II run ends Und. Seg. Install now J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A A M 2008 2009 2010 Down PPS LTU/Und Comm. Linac/BC2 Commissioning Re-commission Inj/BC2 to SL2 NEH Operations/ Commissioning FEE Comm. June 16, 2008

  5. Readiness Reviews • FEE/NEH Beam Readiness Reviews to be held in March-April 2009 time frame • AMO Experiment Readiness Review in June-July 2009 • X-Ray Tunnel/FEH Beam Readiness Reviews to be held in November-December 2009 time frame

  6. FEE Commissioning - Initial Conditions • Start with single undulator • 13.6 GeV electrons • 0.2 nanocoulombs • 10 Hz

  7. FEE Instrument Commissioning5/15 to 6/25 • Conduct FEE Beam readiness review in Mar.-Apr., 2009 • Open Dump stoppers, RP initial survey (1-2 d) • Insert Direct Imager, check upstream apertures (1-2 d) • Commission adjustable slits (1-2 d) • Insert all undulators, 13.6 GeV electrons, RP survey (2-3 d) • Insert gas attenuator apertures, check alignment (1-2 d) • Commission gas attenuator/solid attenuators (1-2 d) • Center reticule on beam, project through C1 (1-2 d) • Decide if OMS realignment is necessary (+/- 1mm range) (0-5 d)

  8. FEE Instrument Commissioning (cont.) • Commission gas detectors (2-4 d) • apertures inserted • add gas • power magnet • compare APD & PMT response to attenuation • Commission K-monochromator (4-6 d) • Transmit beam through 4 bounces (~8.172 eV) • Checkout quadrant photodiode (keep intensity low) • Measure x-ray energy, undulator bandwidth • Measure photon flux (part of CD4 goals) (1 d)

  9. Offset Mirrors6/26 to 7/16 • Tune linac for appropriate energy • Begin with soft x-ray offset mirror system (SOMS) • Insert M1S, use P1 to set angle, translation (2-4 d) • Insert M2S, use P2S to set angle, translation (1-2 d) • Insert M3S2, use P3S2 to set angle, translation (1-2 d) • Retract M3S2 and insert M3S1, use P3S1 to set angle, translation (1-2 d) • Retract M1S and apply same procedure to HOMS (3-5 d) • Priority is SOMS for hutch 2 - delivers beam to AMO experiment

  10. Offset Mirrors (cont.) • Open hutch stoppers to AMO experiment • RP surveys - insure full intensity through C4S2 • Begin AMO experiment alignment

  11. SASE Optimization7/17 to 8/13 • Change linac to 4.52 GeV (nominal 908 eV), check beam center with K-mono (keep intensity low, 1-2 d) • Switch to direct imager, look for FEL (should be able to see signals ≥100 nJ) • If unable to find FEL, measure undulator K values • Change linac back to 13.56 GeV, 10 Hz • Use K-mono to measure spectrum (3-5 d) • Optimize SASE (vary bunch compression, emittance, RF, BBA, etc.) • Above 50 J, imager saturates, need gas attenuator

  12. SASE Optimization (cont.) • If FEL reaches ~0.1-1.0 mJ, commission calorimeter (3-5 d) • Need to limit linac to 10 Hz • Once calorimeter is commissioned, cross-calibrate the gas detectors and the direct imager (2-3 d) • Measure position stability • Electron energy stability already < 0.1% (at end of linac) • During off-hours, deliver beam to AMO experiment

  13. AMO Experiment • HF Physics chamber will be in place by May 1, 2009 • Laser will be ready at the same time • Commissioning of laser transport to AMO exp. begins • Diagnostics chamber to be in place June, 2009 • KB optics delivered in May or June, 2009 • Begin aligning KB optics, HF physics chamber, and diagnostics chamber in mid-July

  14. Summary • Very tight schedule between first beam to FEE and User Run - driven by FY08 budget limitations. • Very tight schedule between AMO experiment installation and User Run - driven by FY08 budget limitations. • We think the goal of achieving lasing at 1.5 nm by Aug.-Sep., 2009 is reasonable • Experiments in Fall, 2009 are not part of CD 4 goals

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