DiagnosticsRichard M. Bionta, LLNLApril 24, 2002: Diagnostics Richard M. Bionta, LLNL April 24, 2002 Diagnostics Layout Facility Diagnostics Commissioning Diagnostics Modeling and Simulation


Slide2: FEE: Slits Attenuators A1 Mirror A2 Optics experiments A4 FEL measurements B1 Monochrometer B2 Optics experiments FFTB HALL A HALL B Tunnel Diagnostic Tanks FEE 1 & 3: Diagnostic Tank A1-1 Commissioning Diagnostic Tank A4-1 Diagnostic Tank B1-1


Facility Diagnostics: Facility Diagnostics Requirements 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


Direct Scintillation Imager: Direct Scintillation Imager CCD Camera Microscope Objective X-ray beam LSO or YAG:Ce crystal prism assembly X-ray beam


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


Solid State Streak Camera: 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)


Solid State Streak Camera Performance: Solid State Streak Camera Performance 1-D streak camera images of shock fronts at 178 nsec sampling rates Pxl Time Pxl


Scattering Foil Imager: Scattering Foil Imager Vacuum pipe, no windows Vacuum pipe, no windows Be Foil / mirror Scintillator Objective CCD System


Micro Strip Ion Chamber: Micro Strip Ion Chamber Differential pump Differential pump Cathodes Segmented horizontal and vertical anodes Isolation valve with Be window Windowless FEL entry


Micro-strip Ion Chamber Focal Plane: Micro-strip Ion Chamber Focal Plane - HV Cathode Shaping electrodes at - HV Electric Field Region of intense electric field where amplification occurs if needed FEL Path of photoelectrons Sensing electrodes Gas


Micro-Strip gas mixer: Micro-Strip gas mixer Shut-off valve Ar Iso Freon Mixed Gas Pressure regulators Flow Control Logic Pressure sensor Component Gas Bottles To Ion Chambers


Similar to larger scale BaBar gas mixer: Similar to larger scale BaBar gas mixer


Diagnostic tank FEE 1: Diagnostic tank FEE 1 Direct Imager Foil Imager ION Chamber Turbo pump Space for calorimeter Isolation valve


Diagnostic tank FEE 1: Diagnostic tank FEE 1 Direct Imager Foil Imager ION Chamber Turbo pump Space for calorimeter Isolation valve


Ion Pumped Diagnostic tanks FEE 3, A1, …: Ion Pumped Diagnostic tanks FEE 3, A1, … Direct Imager Foil Imager ION Chamber Ion pump Isolation valve


Commissioning Diagnostics: Commissioning Diagnostics Tank A4-2 Measurements (requirements) Total energy Pulse length Photon energy spectra Spatial coherence Spatial shape and centroid Divergence


Commissioning diagnostic tank A4-2: Commissioning diagnostic tank A4-2 Aperture Stage “Optic” Stage Detector and attenuator Stage Rail alignment Stages Rail


Costing based on SSRL 2-3 set up: Costing based on SSRL 2-3 set up


Total Energy: Total Energy Crossed apertures On positioning stages absorber Temperature sensor Attenuator Scintillator Poor Thermal Conductor Heat Sink


Pulse Length: Pulse Length X-ray Beam CW Laser Interferometer Time Microscope Streak Cameras


Photon Spectra Measurement: Photon Spectra Measurement Aperture Stage Crystal (8KeV) Grating (0.8 KeV) Stage Detector and attenuator Stage X ray enhanced linear array and stage


Spatial Coherence Measurement: Spatial Coherence Measurement Slits Stage Detector and attenuator Stage Array of double slits


Spatial shape, centroid , and divergence: Spatial shape, centroid , and divergence FEE: A1 A2 A4 FFTB HALL A Diagnostic Tanks FEE 1 & 3: Diagnostic Tank A1-1 Commissioning Diagnostic Tank A4-1 Spatial shape, centroid , and divergence measured by combining data from the imagers in these tanks.


Modeling and Simulation: Modeling and Simulation Single Frequency Gaussian Beam Model Wave Packet Model Monte Carlo


Single frequency Gaussian Beam model: Single frequency Gaussian Beam model 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.


Ginger provides envelope of FEL Gaussian components: Ginger provides envelope of FEL Gaussian components GINGER output: Tables of electric field values at undulator exit at different times viewer Viewer Transformation to Frequency Domain Propagation to arbitrary z R, mm


Wave Simulation combines Ginger and Gaussian: Wave Simulation combines Ginger and Gaussian Modification of Component Gaussians by optical element Summation of modified Gaussian components Gives field vs time Ginger Input


Monte Carlo - Photon ray tracing: Monte Carlo - Photon ray tracing Photons generated according to wave prediction


1.3.1.6 Diagnostics Cost Estimate (FY02 Dollars, Thousands) : 1.3.1.6 Diagnostics Cost Estimate (FY02 Dollars, Thousands)


Summary: Summary Solutions exist for all diagnostics that are within the resource guidelines We can meet the LCLS schedule