Transcript FEE Commissioning

FEE Commissioning
Hal Tompkins – Photon Beam Systems Deputy
June 8, 2009
FEE Commissioning
June 09 FAC
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Hal Tompkins
[email protected]
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 Commissioning
June 09 FAC
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Hal Tompkins
[email protected]
FEE Layout
Solid
Attenuators
Gas
Attenuator
Thermal Sensor
Slit
Gas
Detectors
K-Mono
5 mm collimator
Direct Imager
(Scintillator)
FEE Commissioning
June 09 FAC
FEL Offset Mirror Systems
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Hal Tompkins
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Interim FEE Layout
FEE Commissioning
June 09 FAC
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Hal Tompkins
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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
FEE Commissioning
June 09 FAC
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Hal Tompkins
[email protected]
Phase 1 Commissioning
Cen.
Ref.
FEE Commissioning
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Hal Tompkins
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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
FEE Commissioning
June 09 FAC
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Hal Tompkins
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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
FEE Commissioning
June 09 FAC
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Hal Tompkins
[email protected]
Phase 1 Commissioning (cont.)
FEE Commissioning
June 09 FAC
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Hal Tompkins
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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
FEE Commissioning
June 09 FAC
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Hal Tompkins
[email protected]
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
FEE Commissioning
June 09 FAC
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Hal Tompkins
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Soft X-ray spontaneous from full undulator (calculated)
As seen in Direct Imager, using 5 µm YAG
FEE Commissioning
June 09 FAC
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Hal Tompkins
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Hard X-ray spontaneous, from full undulator (calculated)
As seen in Direct Imager, using 50 µm YAG
FEE Commissioning
June 09 FAC
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Hal Tompkins
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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
FEE Commissioning
June 09 FAC
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Hal Tompkins
[email protected]
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
FEE Commissioning
June 09 FAC
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Hal Tompkins
[email protected]
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, crosscalibrate 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
FEE Commissioning
June 09 FAC
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Hal Tompkins
[email protected]
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
FEE Commissioning
June 09 FAC
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Hal Tompkins
[email protected]
OMS
HOMS and SOMS mounts share a common design
With temperature
controlled to 0.01
deg, pointing
stability is better
than 10 nrad
FEE Commissioning
June 09 FAC
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Hal Tompkins
[email protected]
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
FEE Commissioning
June 09 FAC
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Hal Tompkins
[email protected]
NEH Commissioning
NEH beam steps
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
FEE Commissioning
June 09 FAC
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Hal Tompkins
[email protected]
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
FEE Commissioning
June 09 FAC
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Hal Tompkins
[email protected]