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Diagnostics Richard M. Bionta, LLNL April 24, 2002

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1 Diagnostics Richard M. Bionta, LLNL April 24, 2002
Diagnostics Layout Facility Diagnostics Commissioning Diagnostics Modeling and Simulation LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

2 Layout of X-ray transport and diagnostics.
FEE: Slits Attenuators A1 Mirror A2 Optics experiments A4 FEL measurements B1 Monochrometer B2 Optics experiments HALL A HALL B FFTB Tunnel Diagnostic Tanks FEE 1 & 3: Commissioning Diagnostic Tank A4-1 Diagnostic Tank A1-1 Diagnostic Tank B1-1 LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

3 Facility Diagnostics Requirements Instruments Tanks
Pulse-to-pulse monitoring of pulse energy, shape and centroid Provide information for setting and monitoring facility optics Instruments Direct Imager Scattering Foil Imager Micro Strip Ion Chamber Tanks FEE 1 Ion Pumped tanks LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

4 Direct Scintillation Imager
CCD Camera Microscope Objective X-ray beam X-ray beam LSO or YAG:Ce crystal prism assembly LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

5 LLNL PRAD System – most recent relevant project
CCD cameras LLNL custom 2048 x 2048 gatable intensfied CCD cameras Roper Scientific commercial 512 x 512 gatable intensified CCD cameras SSSC camera electronics: LLNL custom PD array: Hammamatsu 4mm x 1mm x 32 pixels lens: 15 cm dia f/1 to f/3 lenses Optics F/1.8 commercial telephoto lenses by Canon Effective pixel sizes: ccd: 50 x 50 mm to 200 x 200 mm for 10 cm fov sssc: 1.4 x 0.36 mm Protons/X-rays Radiators: Scintillating fiber array LSO crystal screen Phosper screen turning mirrors LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

6 Solid State Streak Camera
For dynamic experiments, LLNL developed1-D streak camera (E. Ables, E. Parker, L. Ott) 128 elements x 512 sampling synchronized by external clock rate (e.g. accelerator timing) PCI interface 1 x 4 mm x 32 elements photodiodes 8 of LBL 16 x 512 analog switch capacity storage and digitizer Modified LOTIS back end LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

7 Solid State Streak Camera Performance
1-D streak camera images of shock fronts at 178 nsec sampling rates Pxl Pxl Time LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

8 Scattering Foil Imager
Vacuum pipe, no windows Vacuum pipe, no windows Be Foil / mirror Scintillator Objective CCD System LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

9 Micro Strip Ion Chamber
Cathodes Isolation valve with Be window Windowless FEL entry Segmented horizontal and vertical anodes Differential pump Differential pump LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

10 Micro-strip Ion Chamber Focal Plane
- HV Cathode Region of intense electric field where amplification occurs if needed FEL Electric Field Path of photoelectrons Gas Shaping electrodes at - HV Sensing electrodes LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

11 Micro-Strip gas mixer Shut-off valve Flow Control Logic Pressure
regulators Pressure sensor To Ion Chambers Ar Iso Freon Mixed Gas Component Gas Bottles LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

12 Similar to larger scale BaBar gas mixer
LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

13 Diagnostic tank FEE 1 Direct Imager Foil Imager ION Chamber
Isolation valve Space for calorimeter Turbo pump LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

14 Diagnostic tank FEE 1 ION Chamber Isolation valve Direct Imager
Space for calorimeter Foil Imager Turbo pump LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

15 Ion Pumped Diagnostic tanks FEE 3, A1, …
Direct Imager Foil Imager ION Chamber Isolation valve Ion pump LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

16 Commissioning Diagnostics
Tank A4-2 Measurements (requirements) Total energy Pulse length Photon energy spectra Spatial coherence Spatial shape and centroid Divergence LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

17 Commissioning diagnostic tank A4-2
Aperture Stage “Optic” Stage Detector and attenuator Stage Rail alignment Stages Rail LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

18 Costing based on SSRL 2-3 set up
LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

19 Total Energy Heat Sink LCLS DOE Review, April 24, 2002
Temperature sensor Poor Thermal Conductor absorber Heat Sink Crossed apertures On positioning stages Attenuator Scintillator LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

20 Pulse Length X-ray Beam Interferometer Streak Cameras Time Microscope
CW Laser LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

21 Photon Spectra Measurement
Detector and attenuator Stage Aperture Stage Crystal (8KeV) Grating (0.8 KeV) Stage X ray enhanced linear array and stage LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

22 Spatial Coherence Measurement
Slits Stage Detector and attenuator Stage Array of double slits LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

23 Spatial shape, centroid , and divergence
FEE: HALL A FFTB Diagnostic Tanks FEE 1 & 3: Commissioning Diagnostic Tank A4-1 Diagnostic Tank A1-1 Spatial shape, centroid , and divergence measured by combining data from the imagers in these tanks. LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

24 Modeling and Simulation
Single Frequency Gaussian Beam Model Wave Packet Model Monte Carlo LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

25 Single frequency Gaussian Beam model
Materials/Dose Kirchoff Diffraction For a given LINAC energy creates an analytic Gaussian-Hermite model of the LCLS FEL electric field that can be used for optical design calculations. Displays electric field parameters (amplitude, FWHM etc..) at user specified position. Calculates peak dose and x-ray optical constants for materials placed in the LCLS beam at user defined positions. Predicts the action of transmissive optics on the LCLS FEL beam. Will upgrade physics to include reflectors and crystals. Will add components for each LCLS optics element. LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

26 Ginger provides envelope of FEL Gaussian components
Viewer 150 GINGER output: Tables of electric field values at undulator exit at different times viewer Transformation to Frequency Domain R, mm Time Domain Frequency Temporal Transform Spatial 1.94 150 -150 Transverse position, microns x 1015 watts c m2 Power Density 6 Time, femtoseconds 4 2 w0 w0-400/fs 1.73 x 1017 w0+400/fs frequency -10 -325 304 Wavenumber, mm-1 Propagation to arbitrary z LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

27 Wave Simulation combines Ginger and Gaussian
Input Time Domain Frequency Temporal Transform Spatial 1.94 150 -150 Transverse position, microns x 1015 watts c m2 Power Density 6 Time, femtoseconds 4 2 w0 w0-400/fs 1.73 x 1017 w0+400/fs frequency -10 -325 304 Wavenumber, mm-1 Modification of Component Gaussians by optical element Summation of modified Gaussian components Gives field vs time LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

28 Monte Carlo - Photon ray tracing
Photons generated according to wave prediction LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

29 1.3.1.6 Diagnostics Cost Estimate (FY02 Dollars, Thousands)
Name PED Construction Contingency Total $ 3,069 - $ $ 3,721 Modeling and Simulations $ $ $ Direct Scintillator Imager $ $ $ Scattering Foil Imager $ $ $ Micro Strip Ion Chamber $ 1,402 $ $ 1,691 Gas Mixing System $ $ $ Tank FEE 1 $ $ $ Ion Pumped Diagnostic Tanks $ $ $ Diagnostic Tank A4 1 $ $ $ Total Energy $ $ $ Pulse Length $ $ $ 1,193 Spectrometer $ $ $ Spatial Coherence $ $ $ Spatial Shape and Centroid $ $ Divergence $ $ $ LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

30 Summary Solutions exist for all diagnostics that are within the resource guidelines We can meet the LCLS schedule LCLS DOE Review, April 24, 2002 Richard M. Bionta, LLNL

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