fee commissioning
DESCRIPTION
FEE Commissioning. Hal Tompkins – Photon Beam Systems Deputy June 8, 2009. 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. Solid Attenuators. - PowerPoint PPT PresentationTRANSCRIPT
1 Hal [email protected]
1FEE CommissioningJune 09 FAC
FEE Commissioning
Hal Tompkins – Photon Beam Systems DeputyJune 8, 2009
2 Hal [email protected]
2FEE CommissioningJune 09 FAC
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
3 Hal [email protected]
3FEE CommissioningJune 09 FAC
FEE Layout
Gas Detectors
Gas Attenuator
Direct Imager(Scintillator) FEL Offset Mirror Systems
Beam Direction
SolidAttenuators
K-Mono
Thermal Sensor
Slit
5 mm collimator
5 Hal [email protected]
5FEE CommissioningJune 09 FAC
Phase 1 CommissioningCommissioning time must be shared between electron and photon halvesReliable lasing at all wavelengths has already been demonstrated
B4C testing is part of commissioningDeposited 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
7 Hal [email protected]
7FEE CommissioningJune 09 FAC
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
8 Hal [email protected]
8FEE CommissioningJune 09 FAC
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 pathC1 Collimator installed in planned location
Temporary beam dump (B4C and W alloy) installed on differential pump standTwo protection ion chambers (PIC’s) downstream of C1 and two more downstream of temporary dumpAir gap of 20 cmThree pairs of hutch stoppers with BTM’s active and stoppers locked closed installed in planned locationC3 collimators installed in planned locationShadow wall and wall 2 window installed
10 Hal [email protected]
10FEE CommissioningJune 09 FAC
Phase 1 Commissioning (cont.)
Installation in downstream half of FEE can proceed during day shift, in parallel with B4C testing in ST0 canDiagnostics and FEL commissioning can proceed during swing and owl shiftsASD will have to search and secure the FEE every dayUpstream half of FEE will require RSWCF for breaking vacuumDamage to Direct Imager YAG screen requires immediate inspection of C1 and temporary beam dumpTarget date for beam to FEE is late June/early July
C1, C3 collimatorsFEE PPS
11 Hal [email protected]
11FEE CommissioningJune 09 FAC
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 planBegin with adjustable slits closed
B4C apertures in attenuator rafts openSlowly open adjustable slits - verify proper slit operationVerify 25 mm x 45 mm fixed mask apertureInsert B4C apertures singly, then each raft.Raft alignment best done with FEL - be careful to keep YAG below saturation
12 Hal [email protected]
12FEE CommissioningJune 09 FAC
As seen in Direct Imager, using 5 µm YAG
Soft X-ray spontaneous from full undulator (calculated)
13 Hal [email protected]
13FEE CommissioningJune 09 FAC
Hard X-ray spontaneous, from full undulator (calculated)
As seen in Direct Imager, using 50 µm YAG
14 Hal [email protected]
14FEE CommissioningJune 09 FAC
Soft X-ray FEL signal in Direct Imager
Peak pixel has 160 photoelectrons / nJ of FEL
As seen in Direct Imager, using 5 µm YAG
15 Hal [email protected]
15FEE CommissioningJune 09 FAC
Phase 1 Commissioning (cont.)
Commission gas detectors - use FELAdd nitrogen gas to detector volumePower magnetCompare APD & PMT response to changes in intensityRepeat at several different photon energies/gas pressures
Commission gas attenuator - interleaved with gas detector commissioningCommission K-monochromator
Transmit beam through 4 bounces (~8.172 eV)Check out quadrant photodiodeConfirm Ni foil calibration of linac energy
16 Hal [email protected]
16FEE CommissioningJune 09 FAC
Phase 1 Commissioning (cont.)
Commission Total Energy detectorPulse energy already measured to be ~1-2 mJ by electron side with ~50% error barsThis 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 rangeIt also needs to be done at multiple intensities - but we must protect the YAG
17 Hal [email protected]
17FEE CommissioningJune 09 FAC
Phase 2 Commissioning
Beam to downstream half of FEEVery 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
18 Hal [email protected]
18FEE CommissioningJune 09 FAC
HOMS and SOMS mounts share a common design
With temperature controlled to 0.01
deg, pointing stability is better
than 10 nrad
OMS
19 Hal [email protected]
19FEE CommissioningJune 09 FAC
LCLS Offset Mirror Systems
HOMS: Hard x-ray Offset Mirror System
SOMS: Soft x-ray Offset Mirror System
830-2000 eV to Hutch 1
830-2000 eV to Hutch 2
20 Hal [email protected]
20FEE CommissioningJune 09 FAC
NEH Commissioning
NEH beam stepsNEH 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
21 Hal [email protected]
21FEE CommissioningJune 09 FAC
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