john bozek amo proposal [email protected] june 2-3, 2008 1 the amo instrument &...
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John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 20081
The AMO Instrument & Science The AMO Instrument & Science DriversDriversJohn Bozek, LCLSJohn Bozek, LCLS
Scientific ProgramScientific ProgramSample sourceSample sourceSpectrometersSpectrometersDiagnosticsDiagnosticsLaserLaserLayoutLayoutFutureFuture
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 20082
Scientific Goals of the AMO instrumentation
Investigate multiphoton and high-field x-ray processes in atoms, molecules and clusters
Multi-photon ionization/excitation in atoms/molecules/clusters
Accessible intensity on verge of high-field regime
Study time-resolved phenomena in atoms, molecules and clusters using ultrafast x-rays
Inner-shell side band experiments
Photoionization of aligned molecules
Temporal evolution of state-prepared systems
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 20083
Proposal WorkshopHeld June 2 &3
Over 60 attendees
Presented team’s scientific program and technical details of instrument
Research interests included:Aligned molecules – Ryan Coffee, PULSE
LCLS as a laser pump – Nina Rohringer, LLNL
Highly charged ions – Peter Beierdorfer, LLNL
Fundamental damage at high intensity – Linda Young, ANL
Imaging/x-ray emission – Daniel Rolles, CFEL
Single shot timing measurements – Hamed Merdji, CEA
Magneto-Optical trapped ColTRIMS – Ali Belkacem, LBNL
AMO experiments for biomolecular imaging – Janos Hadju, SLAC & Uppsala
Time-resolved energy dispersive diffraction – Valerio Rossi-Albertini, ISM-CNR
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 20084
Proposal Workshop
Interest in using the AMO chamber as a vehicle for additional experimental capabilities
Recommended increasing flange sizes on vacuum chamber
Concern about gas density in interaction region with distance from jet to interaction region
From Neumark who’s used to using pulsed jet with cw-synchrotron source
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 20085
AMO Instrument – Experimental Facilities
Optics
High Field Physics ChamberGas jet
Electron TOFs
Ion spectrometers
X-ray spectrometers
Chamber, shielding, pumping, shutter, etc
Diagnostics ChamberMagnetic bottle electron spectrometer
Beam screens
Pulse energy monitor
Pulse picker
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 20087
AMO Instrument Design – focusing optics
Peak intensity depends on size of beam focus – accessible physics depends on intensity
Focus W/cm2
1mm 7×1012
100μm 7×1014
10 μm 7×1016
1 μm 7×1018
100nm 7×1020
Interaction region ~140m from source
Source @ 825 eV - 116m
Divergence @ 825eV - 5.7rad
Unfocussed beam diameter ~1.1mm
Focusing optics ~1m from interaction region
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 20088
Focusing Optics – Elliptical Bender
Side shaping required to achieve best shapeLCLS M1 and M2 Ideal Slope error
-2.00E-07
-1.50E-07
-1.00E-07
-5.00E-08
0.00E+00
5.00E-08
-1.50E-01 -1.00E-01 -5.00E-02 0.00E+00 5.00E-02 1.00E-01 1.50E-01
Distance from mirror center [m]
Slo
pe
erro
r [r
ad]
M1 M2
Images courtesy of Alexis Smith & YiDe Chuang, LBNL
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 20089
Focusing Optics – Elliptical Bender
Optics can be reshaped for 2nd focus 1m downstream with slight increase in slope error
Images courtesy of YiDe Chuang, LBNL
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200810
Focusing Optics – Surface Coatings
Regina Soufli @ LLNL has been working on methodology to achieve smooth B4C coatings – slower depositionIncreased surface stress, however, which may result in delamination
Image courtesy of Regina Soufli, LLNL
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200811
Focusing Optics – Mechanical Design
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200812
Experimental station - Gas jet
Pulsed valve – type described by Proch & Trickl, Rev. Sci. Instrum. 60, 713 (1989)
Piezo disk translator
Valve plunger
Gas supply
Electrical feed through
O ring
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200813
Experimental station – Pulsed Gas Jet
Gas jet chamber
X ray beam
Turbo pump
Skimmer
Interaction region
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200814
Experimental station - Gas jet
Intermediate chambers
Turbo pumps
Gas jet chamber
X ray beam
Interaction region
Multiple skimmers configuration
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200815
High Field Physics – Ion Spectrometers
Three different types of Ion SpectrometerTime-of-flight spectrometer – using integrating metallic anode
Wiley & McLaren, Rev. Sci. Instrum., 26, 1150 (1955).
Velocity map imaging spectrometer – using a phosphor screen to image impact location of ions
Eppink & Parker, Rev. Sci. Instrum., 68, 3477 (1997).
Momentum resolving spectrometer – using a delay line anode to measure position and time of ion impact
Dörner et al., Phys. Rep. 330, 95 (2000).
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200816
High Field Physics – Ion Spectrometers
Ion spectrometers are interchangeable via common sized flange
Similar schemes for mounting lenses/meshes & flight tube
Only integrating ion spectrometer will be used in first year
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200817
High Field Physics – eTOF
Based on a successful design used by D. Lindle’s group at ALS – designed for up to 5keV electrons
Relatively flat transmission above 20eV KE
Figures from O. Hemmers et al., Rev. Sci. Instr., 69, 3809 (1998)
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200818
Experimentation station - ETOF
Turbo pump
Electrical lens
Magnetic shielding
Actuators
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200819
High Field Physics – eTOFFive electron spectrometers arrayed around interaction region
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200820
Experimental station – Chamber X-Section
Ion TOF
eTOF
Gas jet port
Interaction region
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200821
High Field Physics – X-ray spectrometers
Two of the electron spectrometers can be removed & replaced with x-ray emission spectrometers
Spectrometers require high efficiency for diffuse gaseous targets
Single shot capable detectors – either CCD’s/CMOS detectors directly or MCP amplified phosphor screen imaged with camera external to vacuum
Two spectrometers – a grating spectrometer for <2 keV and crystal spectrometer for >2 keV
Design not yet complete
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200822
AMO Instrument - Diagnostics
Diagnostics in a separate chamber with:Magnetic bottle spectrometer
Measures photon wavelength and bandwidth
Can also be used to measure temporal overlap of FEL & laser beam
Total pulse energy monitorMeasures pulse energy on each pulse
Two beam screensMeasures position & size of beam
Either geometric or coherent interference based
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200823
Diagnostics – Magnetic Bottle
Magnetic field directs electrons to detector increasing collection efficiency
As first described by Kruit & Read, J. Phys. E, 16, 313 (1983)
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200824
Diagnostics – Magnetic BottleSingle shot electron energy spectrum – measure photon energy and bandwidth
Design courtesy of Chris Roedig (Lou DiMauro’s group at OSU).
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200825
Diagnostics – Beam Viewing ScreensTwo screens separated by ~ 1m to measure beam trajectory & divergence
1st screen partially transparent – 500m of YAG on SiN membrane imaged with CCD (120Hz)
Second screen can extinguish beam using a thick YAG crystal
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200826
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
0
1
2
3
4
5
0 0.05 0.1 0.15 0.2 0.25 0.3
Time [ms]
Tc200Tc150Tc100
[K]
VG from R. Bionta
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200827
Diagnostics chamber – downstream
Beam viewing screen
Magnetic bottle magnet
XYZ stage
Differential pumping
Magnetic bottle
Power monitor
Beam profile monitor
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200828
NEH Laser
Experiment Chambers
Optical TransportHarmonics
Pulse Compressor (Single Grating)
Optical Transport
Optical Transport
Pulse Cleaner
Regenerative Amplifier
1kHz, <5 mJ
30W Nd:YLF Pump Laser @ 527nm 1.2 kHz
30 fs Mode Locked Ti:sapp @ 800 nm
5 W Nd:YVO4
Pulse Stretcher
30 fs Bandwidth
Laser Hall
Hutch 2
DIAGNOSTIC SUITE
-Spectrometer
-Autocorrelator
-Frog
-Beam Analyzer
-Power Meters
-Oscilloscopes
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200829
NEH Laser System and Optical Transport
Hutch 1Hutch 2Hutch 3
Laser Hall
29
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200830
Introducing Laser into AMO ChamberLaser introduced on-axis using mirror with hole
All focusing/steering outside vacuum
Laser beam diam. ~20-60 um at interaction region
Additional off-axis ports available to bring in laser at sharp angle, better defining interaction region
Similar arrangement on diagnostic chamber
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200831
Controls & Data Acquisition
EPICS will be used to control instrumentation
All motions, voltages, etc. under remote controlTest-stands already being built
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200832
Controls & Data Acquisition
Acqiris DC282 high-speed 10-bit cPCI Digitizer4 channels2-8 GS/s sampling rateAcquisition memory from 1024 kpoints to 1024 Mpoints (optional)Low dead time (350 ns) sequential recording with time stamps6U PXI/CompactPCI standard, 64 bit, 66 MHz PCI bus
Sustained transfer rate up to 400MB/s to host SBC
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200833
Layout of AMO experiment
Design currently being finallized…completion in June
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200836
What’s there July 2009?
Focusing OpticsHigh Field Physics Chamber
Pulsed gas jetIon TOF (Wiley McLaren type)Electron TOFs
DiagnosticsEffusive gas jetMagnetic bottle TOFBeam screens
Synchronized Laser
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200837
And what’s commissioned later ?
Pulse picker (12/09)
High Field Physics ChamberVelocity map imaging ion spectrometer (10/09)Momentum resolving ion spectrometer (reaction microscope/ColTRIMS) (2/10)X-ray spectrometers (1/10)
DiagnosticsPulse energy monitor (11/09)
John Bozek
AMO Proposal Workshop [email protected]
June 2-3, 200838
The Path Forward
Preliminary Design Review CompletedPreliminary Design Review CompletedFinish detailing high field physics chamber, diagnosticsFinish detailing high field physics chamber, diagnostics
Finalize Design & Review – July 08Finalize Design & Review – July 08
Procurement phase – Aug-Dec 08Procurement phase – Aug-Dec 08
Assembly & Testing – Jan-Jun 09Assembly & Testing – Jan-Jun 09
Ready for first light – July 09Ready for first light – July 09
Lots of help from engineering, controls, etc.Lots of help from engineering, controls, etc.