Hal Tompkins – Photon Beam Systems Deputy June 8, 2009 FEE Commissioning Hal Tompkins – Photon Beam Systems Deputy June 8, 2009

First beam into FEE late June/early July First beam into NEH late July Beam Schedule First beam into FEE late June/early July First beam into NEH late July First scheduled user run Sep-Dec. CD 4 goal of beam to FEH accomplished March, 2010

FEE Layout Beam Direction Solid Attenuators Gas Attenuator Thermal Sensor Beam Direction Slit Gas Detectors K-Mono 5 mm collimator Direct Imager (Scintillator) FEL Offset Mirror Systems

Interim FEE Layout

Phase 1 Commissioning Commissioning time must be shared between electron and photon halves Reliable lasing at all wavelengths has already been demonstrated B4C testing is part of commissioning Deposited power is greatest at 830 eV operation - estimated dose to B4C at ST1 is .35 eV/atom, melt dose is calculated at .63 eV/atom B4C testing in ST0 chamber took place in May - this location is 48 m from end of undulator B4C target is continuously monitored with camera at MCC for damage - log entries required on daily basis

Phase 1 Commissioning Cen. Ref.

Phase 1 commissioning (cont.) Requirements for allowing beam to FEE: FEE included in expanded SAD/ASE which is being reviewed internally at SLAC Accelerator Systems Division (ASD) responsible for operation of FEE FEE PPS certified RP survey plan based on LCLS commissioning plan Beam Authorization Sheet for FEE

Phase 1 Commissioning (cont.) Requirements for allowing beam to FEE (cont.): B4C “moveable mask” installed upstream of FEE stoppers (ST1 and ST2) Direct Imager YAG screen permanently installed in beam path C1 Collimator installed in planned location Temporary beam dump (B4C and W alloy) installed on differential pump stand Two protection ion chambers (PIC’s) downstream of C1 and two more downstream of temporary dump Air gap of 20 cm Three pairs of hutch stoppers with BTM’s active and stoppers locked closed installed in planned location C3 collimators installed in planned location Shadow wall and wall 2 window installed

Phase 1 Commissioning (cont.)

Phase 1 Commissioning (cont.) Installation in downstream half of FEE can proceed during day shift, in parallel with B4C testing in ST0 can Diagnostics and FEL commissioning can proceed during swing and owl shifts ASD will have to search and secure the FEE every day Upstream half of FEE will require RSWCF for breaking vacuum Damage to Direct Imager YAG screen requires immediate inspection of C1 and temporary beam dump Target date for beam to FEE is late June/early July C1, C3 collimators FEE PPS

Phase 1 Commissioning (cont.) Overall diagnostics commissioning plan has needed revision - nobody expected immediate lasing at 1.5 Ang. Diagnostics commissioning still begins with Direct Imager - want spontaneous radiation Open FEE stoppers - follow RP survey plan Begin with adjustable slits closed B4C apertures in attenuator rafts open Slowly open adjustable slits - verify proper slit operation Verify 25 mm x 45 mm fixed mask aperture Insert B4C apertures singly, then each raft. Raft alignment best done with FEL - be careful to keep YAG below saturation

Soft X-ray spontaneous from full undulator (calculated) As seen in Direct Imager, using 5 µm YAG

Hard X-ray spontaneous, from full undulator (calculated) As seen in Direct Imager, using 50 µm YAG

Soft X-ray FEL signal in Direct Imager As seen in Direct Imager, using 5 µm YAG Peak pixel has 160 photoelectrons / nJ of FEL

Phase 1 Commissioning (cont.) Commission gas detectors - use FEL Add nitrogen gas to detector volume Power magnet Compare APD & PMT response to changes in intensity Repeat at several different photon energies/gas pressures Commission gas attenuator - interleaved with gas detector commissioning Commission K-monochromator Transmit beam through 4 bounces (~8.172 eV) Check out quadrant photodiode Confirm Ni foil calibration of linac energy

Phase 1 Commissioning (cont.) Commission Total Energy detector Pulse energy already measured to be ~1-2 mJ by electron side with ~50% error bars This measurement is good enough to claim CD 4 goal of 106 photons/mm2-0.1%BW-pulse (though technically it was not made in the FEE) TEM should be accurate to 5-10% Pulse energy measurement is crucial for B4C testing confidence Once total energy monitor is commissioned, cross-calibrate the gas detectors and the direct imager This needs to be done at multiple energies - emphasis on the 830-1800 eV range It also needs to be done at multiple intensities - but we must protect the YAG

Beam to downstream half of FEE Phase 2 Commissioning Beam to downstream half of FEE Very useful for commissioning pop-in monitors and offset mirror systems - can commission through P3’s Will require agreement from RSO that B4C test piece in ST0 can has seen sufficient number of FEL pulses to justify confidence in B4C being “FEL-proof” Some fraction of commissioning time will continue to be spent dumping pulses into ST0 test mask FEL will terminate at hutch stoppers S1, S2, and SH1 or B4C-protected collimators

HOMS and SOMS mounts share a common design With temperature controlled to 0.01 deg, pointing stability is better than 10 nrad

HOMS: Hard x-ray Offset LCLS Offset Mirror Systems HOMS: Hard x-ray Offset Mirror System 830-2000 eV to Hutch 1 SOMS: Soft x-ray Offset Mirror System 830-2000 eV to Hutch 2

NEH Commissioning NEH beam steps Beam to NEH in late July NEH ARR June 30-July 1 AMO IRR mid-July Hutch HPS certified XFD Operations procedures in place, reviewed, and approved by SLAC 24/7 floor coordinator coverage in place Beam Line Authorization for Hutch 1 AMO beam containment plan approved by RSO Beam to NEH in late July

First beam into FEE late June/early July Summary First beam into FEE late June/early July First beam into NEH in late July First scheduled user run Sep-Dec CD 4 goal of beam to FEH March, 2010