richard m. bionta xtod beam and detector [email protected] october 12-13, 2004...
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Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
XTOD Beam and Detector Simulations
Facility Advisory Committee Meeting
October 12-13, 2004*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.
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Outline
Spontaneous Radiation Model
Spontaneous and FEL signals in Direct Imager Diagnostic
Spontaneous Reflection in Undulator Vacuum Chamber
Conclusions
Spontaneous Radiation Model
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Spontaneous Data Chain
UCLA Near-Field Calculator ~2 Gbyte HDF5
HDF5 to Paradox Converter(x,y,E,P) Paradox format, 4 X 1 GByte
ReBinner – Coarser Energy Bins (159) (x,y,E,P) Paradox format, 350 MByte
Blob DB Converter – faster to read(E,P[x,y]) Paradox, 50 MBytes
Viewer xy
E
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Spontaneous Fluence at NEH Hutch 1
Fluence
X, mm200150100500-50-100-150-200
Y, m
m
60
40
20
0
-20
-40
-60
Fluence
X, mm6040200-20-40-60
Y, m
m
20100
-10-20
Te = 4.5 GeVZ = 243 mx = 1.0 mmy = 0.3 mm1.85 mJ
Te = 14.5 GeVZ = 243 mx = 0.3 mmy = 0.1 mm18.2 mJ
2”
4”
EEPFE
yxyx )(,,
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Energy Slices
0 < E < 10 keV 7.6 < E < 9.0 keV 10 < E < 20 keV 20 < E < 27 keV
20 mm
20 m
m
Far-Field calculation 400 m from Center-of-Undulator, Roman Tatchyn, SSRL
Near-Field calculation 88 m from End-of-Undulator, Sven Richie, UCLA
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
2-3 mJ FEL
20 mJ Spontaneous
3 mJ High energy core E > 400 keV
LCLS beam footprint
At entrance to NEH, FEL tuned to 8261 eV Fundamental
Expected LCLS beam profile contains FEL and Spontaneous halo
Spontaneous and FEL signals in the Direct Imager Diagnostic
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Camera Image Calculator ChainSpontaneous
DB
(E,P[x,y])
FEL
x
Spontaneous + x FEL
Absorbed in 25 m LSO
Photoelectrons in Camera
(2.5 x Zeiss + SITEC CCD)
Transmitted by Material
x
yE
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
14.5 GeV Spontaneous, NEH H1
Fluence
X, mm6040200-20-40-60
Y, m
m
20151050
-5-10-15-20
Photon Energy Spectra
E, keV806040200
Num
ber
/ keV
80,000,000,00070,000,000,00060,000,000,00050,000,000,00040,000,000,00030,000,000,00020,000,000,00010,000,000,000
0
Fluence
X, mm6040200-20-40-60
Y, m
m
20151050
-5-10-15-20
Photon Energy Spectra
E, keV806040200
Num
ber
/ keV
80,000,000,00070,000,000,00060,000,000,00050,000,000,00040,000,000,00030,000,000,00020,000,000,00010,000,000,000
0
Stops in 25 m LSO
All photons
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
14.5 GeV Spontaneous Direct Imager Signal
Horizontal LineOut
X, mm6050403020100-10-20-30-40-50
Pho
toE
lect
rons
/Pix
el 150,000
100,000
50,000
0
Photons Energy
Stops in 25 m LSO
All photons
CCD photoelectron levels < 150K e-
Full well (16 bit) 327K e-
so this is ½ scale on CCD readout
Photoelectrons/Pixel
(X-Ray resolutionx m)
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Horizontal LineOut
X, mm6040200-20-40
Pho
toE
lect
rons
/Pix
el
1,000,000,000
500,000,000
0
14.5 GeV Spontaneous + FEL
Fluence
X, mm6050403020100-10-20-30-40-50-60
Y, m
m
20
15
10
5
0
-5
-10
-15
-20
Stops in 25 m LSO
All photons
Photoelectrons/Pixel
Photons Energy
Need attenuation of 2.4 x 10-4 for CCD full well
(X-Ray resolutionx m)
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Use of 16.9 mm B4C Attenuator
Ph
oto
ns/keV
Raw photon spectra of FEL + Spontaneous
Spectra of FEL + Spontaneous after B4C
Spectra of photons stopping in LSO
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Direct Imager Image
Horizontal LineOut
X, mm6050403020100-10-20-30-40-50
Pho
toE
lect
rons
/Pix
el
100,000
50,000
0
100% FEL + Spontaneous through 16.8 mm B4C into 25 mm LSO
14.5 GeV
Good FEL signal at ½ CCD Full Scale but increased background in image
Fluence
X, mm6040200-20-40-60
Y, m
m
20151050
-5-10-15-20
(X-Ray resolutionx m)
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
How faint can FEL be?
Fluence
X, mm6040200-20-40-60
Y, m
m
20151050
-5-10-15-20
Horizontal LineOut
X, mm6040200-20-40
Pho
toE
lect
rons
/Pix
el
30,000,000
25,000,000
20,000,000
15,000,000
10,000,000
5,000,000
0
Horizontal LineOut
X, mm6050403020100-10-20-30-40-50
Pho
toE
lect
rons
/Pix
el
400,000
300,000
200,000
100,000
0
Fluence
X, mm6040200-20-40-60
Y, m
m
20151050
-5-10-15-20
1% FEL + Spontaneous directly into 25 mm LSO14.5 GeV
0.01% FEL + Spontaneous into 25 mm LSO
(X-Ray resolutionx m)
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Fluence
X, mm2001000-100-200
Y, m
m
60
40200
-20-40
-60
Fluence
X, mm2001000-100-200
Y, m
m
60
4020
0
-20-40
-60
4.5 GeV Spontaneous, NEH H1
Stops in 25 m LSO 1.205 mJ
All photons 1.852 mJ
8 x 1011
0
Ph
oto
ns
/ ke
V
Horizontal LineOut
X, mm200150100500-50-100-150
Pho
toE
lect
rons
/Pix
el
15,000
10,000
5,000
0
Direct Imager Photoelectrons
Direct Imager Photoelectrons
(X-Ray resolutionx m)
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
4.5 GeV Spontaneous + x FELDirect Imager Photoelectrons
Horizontal LineOut
X, mm200150100500-50-100-150
Pho
toE
lect
rons
/Pix
el 5,000,000
4,000,000
3,000,000
2,000,000
1,000,000
0
Horizontal LineOut
X, mm200150100500-50-100-150
Pho
toE
lect
rons
/Pix
el 25,000
20,000
15,000
10,000
5,000
0
Fluence
X, mm2001000-100-200
Y, m
m
604020
0-20-40-60
Fluence
X, mm2001000-100-200
Y, m
m
60
40
20
0-20
-40
-60
Direct Imager Image
1 % FEL
0.01 % FEL
(X-Ray resolutionx m)
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Commissioning with Direct Imager
Direct Imager will see spontaneous on a single shot at 4.5-24.5 GeV
Direct Imager will need 10-4 attenuation for on scale operation at full FEL power, which increases background. These calculations show a factor of ~5-10 margin.
Without attenuator, Direct Imager will see FEL at 0.01% power at 4.5 GeV and significantly < 0.01% at 14.5 GeV
Spontaneous Reflection in Undulator Vacuum
Chamber
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Spontaneous Monte Carlo Chain
Spontaneous Blob DB(E,P[x,y]) Paradox, 50 Mbytes
Inject FEL(E,P[x,y]) Paradox, 50 Mbytes
Cumulative DB(x,y,F[E]) Paradox, 50 Mbytes
Photon MC Generator – creates random photons according to cumulative distribution
(x,y,z,vx,vy,vz,E) of individual photons
0
,
0
,
,
)(
)(
dEEP
dEEP
EF
yx
E
yx
yx
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Spontaneous Monte Carlo Simulation
Initial Z
z, meter2001000
Eve
nts
/ 2 m
eter
15,000
10,000
5,000
0
Source spatial distribution
x, mm210-1-2
y, m
m
2
1
0
-1
-2
Photon starting x, y matches electron distribution, a Gaussian with = 30 m
Photon starting z is uniform along undulator (from 0 < z < 130 m)
Photon starting angles generated to give calculated spontaneous spatial distribution
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Each photon final x, y has its own cumulative energy distribution
Source Energy Distribution
E, KeV100500
Events
/ 1
KeV
90,00080,00070,00060,00050,00040,00030,00020,00010,000
0
x
yE
Monte Carlo Energy Distribution
Calculated far-field energy spectrum
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Simulated spatial distributions agree with far-field calculation
Final position
Final x, mm1050-5
Fin
al y
, mm
1086420
-2-4-6-8
Final Position 1st harmonic
Final x, mm1086420-2-4-6-8
Fin
al y
, mm
1086420
-2-4-6-8
Monte Carlo465 m from beginning of undulator
Far-Field Calculation400 m from center of undulator
All Photons
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Final position, 2nd harmonic
Final x, mm1086420-2-4-6-8
Fin
al y
, mm
1086420
-2-4-6-8
Final Position, 3rd harmonic
Final x, mm1086420-2-4-6-8
Fin
al y
, mm
1086420
-2-4-6-8
Final position, E> 400 KeV
Final x, mm1086420-2-4-6-8
Fin
al y
, mm
108642
0-2-4-6-8
Simulated spatial distributions agree with far-field calculation – higher orders
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Spontaneous Emission Angle Below Critical Angle
130 m
243 m
max = 0.5 – 1.8 mRadmin = 0.2 – 0.8 mRad
Cu Reflectivity @ 8261 eV
0
0.5
1
0 10 20 30 40 50
mRad
R
60-200 mm
Cu Reflectivity @ 826 eV
0
0.5
1
0 50 100 150
Angle, mRad
R
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Vacuum Pipe Simulation 14.5 GeV
Final position
Final x, mm6050403020100-10-20-30-40-50
Fin
al y
, mm
20
15
10
5
0
-5
-10
-15
Final position
Final x, mm6050403020100-10-20-30-40-50
Fin
al y
, mm
20
15
10
5
0
-5
-10
-15
With pipeWithout pipe
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Line outs through center
With pipeWithout pipe
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Flux
X, mm6040200-20-40-60
Y, m
m
20100
-10-20
Reflection at higher orders
Final Position 1st harmonic
Final x, mm6040200-20-40
Fin
al y
, mm
20
10
0
-10
Final position, 2nd harmonic
Final x, mm6040200-20-40
Fin
al y
, mm
20
10
0
-10
Final Position, 3rd harmonic
Final x, mm6040200-20-40
Fin
al y
, mm
20
10
0
-10
Final Position 1st harmonic
Final x, mm6040200-20-40
Fin
al y
, m
m 20100
-10
Final position, 2nd harmonic
Final x, mm6040200-20-40
Fin
al y
, m
m 20100
-10
Final Position, 3rd harmonic
Final x, mm6040200-20-40
Fin
al y
, m
m 20100
-10
Monte Carlo, with pipe
Flux
X, mm6040200-20-40-60
Y, m
m
20100
-10-20
0 < E < 10 keV 10 < E < 20 keV 20 < E < 30 keV
Flux
X, mm6040200-20-40-60
Y, m
m
20100
-10-20
UCLA Calculation, without pipe
Monte Carlo, without pipe
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Photon Energies > 400 KeV
Final position, E> 400 KeV
Final x, mm6050403020100-10-20-30-40-50
Fin
al y
, m
m
20
10
0
-10
Final position, E> 400 KeV
Final x, mm6050403020100-10-20-30-40-50
Fin
al y
, mm
20
10
0
-10
With pipe
Without pipe
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Reflection in pipe at 4.5 GeV
Final position
Final x, mm200150100500-50-100-150
Fin
al y
, mm
50
0
-50
Final position
Final x, mm200150100500-50-100-150
Fin
al y
, mm
50
0
-50
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Tilted pipe at 14.5 GeVFinal position
Final x, mm6050403020100-10-20-30-40-50
Fin
al y, m
m 20
15
10
5
0
-5
-10
-15
Final position
Final x, mm6050403020100-10-20-30-40-50
Fin
al y
, mm
20
10
0
-10
Pipe parallel to beam
Pipe tilted 19 R, raised 0.9
mm, and shifted to the right 0.9 mm
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Vacuum chamber reflections
We will see a lot of reflection of the spontaneous off of the tube.
The reflection will increase the spontaneous background in the center by x 3 to 4.
Twists and tilts in the vaccum chamber will make it hard(er) to interpret the observed spontaneous radiation pattern
Future work and conclusions
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Near term activities plannedModeling and Simulation - during CR
Spontaneous / FEL simulationsCalculate Beam sizes at Gas Attenuator, Cameras, etc. … with aperturesRe-sampling for true response at 14.5 GeVSimulations of Camera response to mix of Spontaneous and FEL with optimum attenuators and scintillator
Decide on the apertures! Pipes, Muon shield, …
Component R&D - after CRSpectrometer, Total Energy, Damage
Mechanical & Vacuum - after CRDecide on the apertures! Pipes, Muon shield, …Gas Attenuator Calculations and PrototypeBeam Line Layout / Standardization / Detailed Specifications
Richard M. Bionta
XTOD Beam and Detector Simulations [email protected]
October 12-13, 2004 UCRL-PRES-XXXXX
Summary
Layout geometry is set
Beam modeling codes in place
Reflection off of undulator vacuum chamber seriously distorts the spontaneous radiation pattern
Direct imager model in progress to specify scintillator and attenuator thickness, and CCD gain parameters. Need similar model for Indirect Imager, and Calorimeter.
Modeling of other diagnostics will proceed in FY05