Two Problems...
LCLS Diagnostics and
Commissioning Workshop
*This work was performed under the auspices of the U.S. Department of Energy by the University
of California, Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48 and by
Stanford University, Stanford Linear Accelerator Center under contract No. DE-AC03-76SF00515.
September 22, 2004
UCRL-PRES-206663
X-Ray Transport, Diagnostic, & Commissioning Plans
Richard M. Bionta
bionta1@llnl.gov
Gain Length Measurement
How faint can FEL be?
(X-Ray resolution
300 x 100 mm)
14.5 GeV
1% FEL + Spontaneous directly intoHorizontal
25 mm
LSO
LineOut
20
15
10
5
0
-5
-10
-15
-20
-60
30,000,000
PhotoElectrons/Pixel
Y, mm
Fluence
25,000,000
20,000,000
15,000,000
10,000,000
5,000,000
0
-40
-20
0
X, mm
20
40
60
-40
-20
0
X, mm
20
40
60
0.01% FEL + Spontaneous intoHorizontal
25 mm
LSO
LineOut
20
15
10
5
0
-5
-10
-15
-20
-60
September 22, 2004
400,000
PhotoElectrons/Pixel
Y, mm
Fluence
-40
-20
0
X, mm
20
300,000
200,000
100,000
40
60
UCRL-PRES-206663
X-Ray Transport, Diagnostic, & Commissioning Plans
0
-50 -40 -30 -20 -10 0 10 20 30 40 50 60
X, mm
Richard M. Bionta
bionta1@llnl.gov
Camera Image Calculator Chain
Spontaneous
(E,P[x,y])
Absorbed in
25 mm LSO
Spontaneous
+ FEL
resampler
Photoelectrons
in Camera
(2.5 x Zeiss + SITEC
CCD)
y
x
September 22, 2004
E
Spontaneous Transmitted
by Material
UCRL-PRES-206663
X-Ray Transport, Diagnostic, & Commissioning Plans
Richard M. Bionta
bionta1@llnl.gov
Gain Length Simulation
Run separate spontaneous calculations at position of
imagers for roll-away undulator senario. Current spatial
binning good. Energy binning too fine.
Run FEL simulations for previous cases. Use finer spatial
binning (10 microns.) Put in same format as as
spontaneous.
Write re-sampler module for XTOD analysis chain to
combine FEL and spontaneous at camera resolutions.
Evaluate camera response
September 22, 2004
UCRL-PRES-206663
X-Ray Transport, Diagnostic, & Commissioning Plans
Richard M. Bionta
bionta1@llnl.gov
What fixed apertures will
we allow?
PPS
4'
Muon
shield
1.5 Scope: Front End
Enclosure/ Near
Experimental Hall
NEH
PPS
Flipper Mirror
Front End Enclosure
Slit A
Comissioning:
Spectrometer,
Total Energy
Solid
Attenuator
112 m
Photon
Beam
83 m
Slit B
Direct Imager
Indirect Imager
Gas Attenuator
Fast
close
valve
Electron
Beam
September 22, 2004
13'
Muon
shield
Electron Dump
UCRL-PRES-206663
X-Ray Transport, Diagnostic, & Commissioning Plans
Richard M. Bionta
bionta1@llnl.gov
Spontaneous Fluence at NEH Hutch 1
Fx , y   Px , y ( E )  E
E
Fluence
60
40
Te = 4.5 GeV
Z = 243 m
Dx = 1.0 mm
Dy = 0.3 mm
1.85 mJ
Y, mm
20
0
-20
-40
-60
-200
-150
-100
-50
0
X, mm
50
100
150
200
2”
4”
September 22, 2004
Y, mm
Fluence
20
10
0
-10
-20
-60
-40
-20
0
20
X, mm
40
UCRL-PRES-206663
X-Ray Transport, Diagnostic, & Commissioning Plans
60
Te = 14.5 GeV
Z = 243 m
Dx = 0.3 mm
Dy = 0.1 mm
18.2 mJ
Richard M. Bionta
bionta1@llnl.gov
Spontaneous with Vacuum Pipe
Reflection
4.5 GeV
Near Hall, Hutch 1
14.5 GeV
Final position
20
50
15
10
0
-50
-150 -100 -50 0
50
Final x, mm
Final y, mm
Final y, mm
Final position
100 150 200
5
0
-5
-10
-15
4.5 GeV beam >10 cm diameter
-50 -40 -30 -20 -10 0 10 20 30 40 50 60
Final x, mm
14.5 GeV beam >4 cm diameter
September 22, 2004
UCRL-PRES-206663
X-Ray Transport, Diagnostic, & Commissioning Plans
Richard M. Bionta
bionta1@llnl.gov
Setting apertures
Strategy should be to allow as wide a beam
possible during commissioning, then put in
our custom Fixed Masks
We need to generate 4.5 and 14.5
spontaneous radiation patterns at minimum
apertures (muon shields, post undulator …)
We need to understand aperture limits
(radiation safety) and consequences
(commissioning) and finalize
September 22, 2004
UCRL-PRES-206663
X-Ray Transport, Diagnostic, & Commissioning Plans
Richard M. Bionta
bionta1@llnl.gov
Photon Energies > 400 KeV
Final position, E> 400 KeV
Final y, mm
20
10
0
Without pipe
-10
-50
-40
-30
-20
-10 0
10
Final x, mm
20
30
40
50
60
Final position, E> 400 KeV
Final y, mm
20
10
0
With pipe
-10
-50
September 22, 2004
-40
-30
-20
-10
0
10
Final x, mm
UCRL-PRES-206663
X-Ray Transport, Diagnostic, & Commissioning Plans
20
30
40
50
60
Richard M. Bionta
bionta1@llnl.gov