XTOD Update - SSRL · 2007. 10. 31. · X-TOD Update [email protected] October 30, 2007...
Transcript of XTOD Update - SSRL · 2007. 10. 31. · X-TOD Update [email protected] October 30, 2007...
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
XTOD Update
Facility Advisory CommitteePhoton Breakout Session
October 30, 2007
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
LCLS Layout
Linac
FEE (Front-End-Enclosure)Diagnostics
SOMSHOMS
UndulatorHall
NEH (Near Experimental Hall)
X-Ray Tunnel
FEH (Far Experimental Hall)
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
XTOD Commissioning Diagnostics and Offset Mirrors in the Front End Enclosure (FEE)
Gas Detector
GasDetector
Gas Attenuator
Direct Imager(Scintillator) FEL Offset Mirror Systems
Fixed Mask
Beam Direction
SolidAttenuators
K SpectrometerSoft X-Ray Imager
Thermal Sensor
Slit Collimators
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
FEE Diagnostic Hardware
Fixed Mask / Slit – On orderAttenuator – On orderGas Detector – On order (see prototype results)
K Measurement / Soft X-Ray imagerNeed to redo SCR
Thermal Sensor – in final designDirect imager – in final designControls – Mostly procured
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Windowless gas detector exploits N2photoluminescence
FEL
Primary photoelectrons cause N2 molecules to fluoresce in the near UV
N2 gas inletPhoto detector
Removable aperture
Photo detector Magnet coils
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Gas Detector Prototype under test at SSRL
Direct Imager Prototype
Ion ChamberGas Detector
Prototype
Ion Chamber
Beam Direction
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Prototype Gas Detector insert for measuring x ray induced photoemission of candidate wall materials
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Gas Detector signal vs. magnetic field at various pressures
0 50 100 150 200 25010-5
10-4
10-3
12:00: 2.1 Torr 4.1 Torr 8.0 Torr 14.5 Torr 28.0 Torr 50.1 Torr 100 Torr 200 Torr 375 Torr 723 Torr
PM
T S
igna
l (μW
/1012
8ke
V p
h)Magnetic Field (Gauss)
9:00: 2.1 Torr 4.0 Torr 8.0 Torr 14.6 Torr 28.1 Torr 50.1 Torr 104 Torr 198 Torr 372 Torr 720 Torr
CHROMA filter, 8.2 keV (in tune), no insert
0 50 100 150 200 250105
106
107
108
Num
ber
Magnetic Field (Gauss)
p (Torr) 2 4 8 14 28 50 100 200 400 760
{Total # UV photons from gas} x {QEPMT}/{QE365nmPMT } x {Tfilter}
Simulated Measured
Simulation and measurement, when expressed in units of number of UV photons at detector, agree to within a factor of 2
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
UV signal closely represented by 9:00, B on (red): Al is the best
graphite PMMA Al Si Cu silica Be Au holder SS sapphire105
106
107
108
109graphite PMMA Al Si Cu silica Be Au holder SS sapphire
graphite PMMA Al Si Cu silica Be Au holder SS sapphire
graphite PMMA Al Si Cu silica Be Au holder SS sapphire
1.3x10-5
1.3x10-4
1.3x10-3
1.3x10-2
1.3x10-1
PMT
Sign
al (#
UV
ph/1
012 8
keV
ph)
9:00, B off 9:00, B on 12:00, B off 12:00, B on
# U
V p
hoto
ns in
to 2π
/ x-r
ay p
hoto
n
Measured luminescence of solids at 8 keV
Al
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
0 5 10 15 200
2x107
4x107
6x107
e
nerg
y de
posi
tion
rate
(keV
/ns)
time (ns)
energy deposited into N2
walls end caps
UV signal withinX rays scattered into walls ~ 1 ns
Photoelectrons hitting end caps 0 – 15 ns
X rays scattered into detector window ?Photoelectrons hitting walls 0 – 18 ns
Secondaries hitting walls and end caps 0 – 200 ns (?)Energy of photoelectrons deposited into N2 0 – 45 ns
Time dependence of gas detector signal from the 8keV fundamental
0 20 40 60 80 1000
2x107
4x107
6x107
UV
pho
tons
(arb
. uni
ts)
time (ns)
signal from N2 (τ~25ns) walls (τ~1ns) end caps (τ~1ns)
relative amplitude of curvesis not known
signalto bemeasured
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Gas Detector Final Design
AvalanchePhotodiode
Photo Multiplier Tube
Magnet Coils
Pressure sensors
Gas inlet / flow control
UV quiet liner
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
840 eV < Eγ < 860 eV hν1= 844.6 eV
effective bandwidth = 5 5*10-3
2 x 1010 photons, total 2.6 x 10-6 J, total
7.8 x 10-7 J/cm2, center
Indirect imager finds spontaneous core
Vacuum chamber
Princeton Instruments back illuminated CCD camera25 x 25 mm chip, 20 um pixel size
ML mirror 8% reflectivity, 1% bandwidth
Raw soft spontaneous After reflection
Status Indirect Imager:PRD doneSCR redo
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Channel-cut Si Monochrometer will be used to measure relative K of two undulator segments
Linac E variation andmeasurement
Monochrometer
Detector
Detector monochrometer
measures intensity at a single point
Use linac E variation and measurement to obtain other points along curve
Two undulatorspontaneous spectrum. Falloff of high energy tail is independent of aperture
Two undulatorspontaneous high energy falloff has highest slope when ΔK/K=0. Status K Spectrometer:
PRD doneSCR redo
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Total Energy (Thermal) Sensor provides calibrated measurement of FEL pulse energy
ThermistorsNd0.66Sr0.33MnO3
(On back of substrate)
FEL pulse
Cu heat sink
0.5 mm Si substrate
Measures FEL energy deposition through temperature rise
t = 0t = 0.1 ms t = 0.25 ms
Thermal diffusion of FEL energy
Sensor Temperature Rise
[K]
Status Thermal Sensor:PRD doneSCR donePDR donePrototype doneFDR in progress
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Thermal sensor plagued by “prompt” pulse that is difficult to suppress
Absorbed Laser Energy, μJ Absorbed Laser Energy, μJ
ΔT
, °Κ
ΔT
, °Κ
At 100 μsec At 3 msec
Finite difference prediction
Measured data
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Epoxy
Slow Thermal Sensor:Slow speed with epoxy joint
Backup thermal sensor: Slow down response, average pulses
Thermistor(Top, ∂R/∂T)
FEL (Etotal)
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Slow sensor: Response is thermal, and linear with E
Response linear over three decades
Peak Temperature vs. Laser Pulse Energy
Sensor Resistance vs. Temperature
Response changes with TCR
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Thermistor(Top, ∂R/∂T)FEL (Etotal)
Heat sink(Tbath)
Substrate (heat capacity C, speed)
Trenches/bridges
Epoxy
Basic TEM design:fast, sensitive, rad hard, but affected by artifacts
Medium speed TEM:~100 µm bridges.
slow enough?
Slow TEM:Adjust speed with epoxy.
too slow?
The Options: Same sensor technology, different speeds
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Direct Imager, preliminary designSingle shot measurement of
f(x,y), x, y ,u
Camera
Scintillators
Status Direct Imager:PRD doneSCR donePrototype donePDR donein Final Design
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Absorbed in 1 mm YAG, Maximum ~ 140,000 photoelectrons/pixelFull Well: 200,000Camera: Photometrics 512BObjective: Navitar Platinum 50
Power: 0.1365NA: 0.060
Soft X-Ray spontaneous, all undulator segments, thick scintillator
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Objective: Navitar Platinum 50Power: 0.1365NA: 0.060
Absorbed in 5 um YAG, Maximum ~ 20,000 photoelectrons/pixel Camera: Photometrics 512B
Soft X-Ray Spontaneous all undulatorsegments, thin scintillator
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Objective: Navitar Platinum 50Power: 0.1365NA: 0.060
Camera: Photometrics 512B
Absorbed in 5 um YAG, Maximum ~ 3.7e+8 photoelectrons/pixel
Soft X-Ray FEL signal, thin scintillator
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Absorbed in 1 mm YAG, Maximum ~ 1,800 photoelectrons/pixel Full Well: 200,000Camera: Photometrics 512BObjective: Navitar Platinum 50
Power: 0.1365NA: 0.060
Soft x-ray spontaneous, first undulator segment, thick scintillator
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Scintillator signals in FEL equivalents
CCD Range
YAG Range
Needed x-ray
attenuation
Needed x-ray
attenuation
Need x-ray attenuation of > 100 and visible attenuation of > 10
Needed visible
attenuation
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Direct Imager SSRL Run to measure YAG::Ceyield, Nov. 6-8, 2007
Vacuum window
Cascade
YAG*
WFOV Optic
NFOV Optic
Ion chamber
X-ray filtersCrossed
wires
Ion chamber
Beam line 2-2
Pulnix
*YAGs are the parts from Sant-Goban1) 12 mm x 12 mm x 1 mm2) 25 mm x 25 mm 5 micron
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
FEE Racks are being loaded and wired
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Offset Mirror SystemCollimators – in final designSOMS – Mirrors purchased June 1st
Mount will follow HOMS designHOMS
Mirrors in final designPlan to purchase by December 30
Mount in preliminary designProblems with 50 nRad stability requirement
Pop-in Alignment CamerasProcurement delayed until FY09FOV’s and positions establishedPulnix 4200 camera under test at LLNLConceptual hardware design in progress
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
FEL Offset Mirror Systems
SOMS and HOMS reflect horizontally
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
FEL Offset Mirror Systems and “Pop-in”imagers for alignment
P PP P
P
P
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Differences between FEL offset mirrors and synchrotron mirrors
Multi KW power loading seen at synchrotrons not an issue at LCLS
Instead we worry about single shot damage from FELActive bending of Mirrors
Used at synchrotrons to make 100m radii for focusingNeeded at LCLS (HOMS) to maintain > 1 Mm radii so as to not change FEL divergence
Pointing stabilityStringent requirements for HOMS for a steady beam in the FEH
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
SOMS mirrors are coated with B4C
t = 500 Å, θ = 13.9 mrad, σ = 4.5 ÅAt least ~ 90% up to 2.0 keVGood 3rd harmonic rejection
Primary pass-band
3rd harmonicpass-band
Status SOMS:PRD doneSCR doneMirror PDR doneMirror FDR doneMirrors in Purchase / Fabrication
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
HOMS mirrors will be coated with SiC
(t = 500 Å)
(t = 500 Å)
Status HOMS:PRD draftSCR 7/17
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Pop-in alignment camerasPulnix 4200 2k x 2k
1 mm thick YAG::Ce, up to 60 mm x 60 mm
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
SOMS Run025
Pop-in 1 (After SOMS Mirror 1)
Reflected off Mirror 1
Misses Mirror 1
~1000 photoelectrons / per pixel / pulse, likely need to integrate over 10 pulses
Camera: Pulnix TM-4100GE
Lens: Schneider Navitar Platinum 50
Power: 0.2526NA: 0.100
2 keV fundamental1 mm YAG, Full Well: 40,000
We are studying expected signal levels in the Pop-in cameras
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
2 keV fundamental1 mm YAG, Full Well: 40,000
Camera: Pulnix TM-4100GE
Lens: Schneider Navitar Platinum 50
Power: 0.2526NA: 0.100
~1000 photoelectrons / per pixel / pulse, likely need to integrate over 10 pulses
Pop-in 2 (After SOMS Mirror 2)
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
XTOD elements in Near Hall
Hard X-Ray Vacuum transport line stay-out
barrier
This section will not be installed but is planned for in case of delays in the installation of LUCI equipment
Collimators
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Status Tunnel:PRD doneSCR donePDR doneESD doneFDR done
XTOD Tunnel Design Complete
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
Integrated EPICS control system for XTOD has been designed
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Richard M. BiontaX-TOD Update [email protected] 30, 2007
UCRL-PRES-xxxxxxx
SummaryProgress continues on XTOD :
Procurement - Slit, Fixed Mask, Attenuator, Gas Detector In final design– Direct Imager, Thermal Detector, collimators, HOMS mirrorsIn preliminary design – Mirror mechanical, In conceptual design – K Spectrometer, Soft x-ray imager, Pop-in Alignment system
Problem areasThermal sensor signal degraded by non-thermal prompt signalSoft x-ray imager and K spectrometer design laggingHOMS pointing stability challenging
FEE diagnostic instrumentation will be ready for instillation in 2008