Yiping Feng [email protected]LUSI DOE Review Aug. 19, 2008 Diagnostics/Optics (WBS 1.5) p. 1 LUSI LUSI Diagnostics & Common Optics Diagnostics & Common Optics WBS 1.5 WBS 1.5 Yiping Feng – DCO Lead Scientist LUSI CD-2 Review August 19, 2008 Lead Engineer: Eliazar Ortiz Mechanical Engineer: Marc Campell Mechanical Engineer: Nadine Kurita Design Engineer: Rick Jackson Designer: Don Arnett Designer: Ben Bigornia
LUSI Diagnostics & Common Optics WBS 1.5. Yiping Feng – DCO Lead Scientist LUSI CD-2 Review August 19, 2008. Lead Engineer: Eliazar Ortiz Mechanical Engineer: Marc Campell Mechanical Engineer: Nadine Kurita Design Engineer: Rick Jackson Designer: Don Arnett Designer: Ben Bigornia. - PowerPoint PPT Presentation
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LUSI DOE Review Aug. 19, 2008Diagnostics/Optics (WBS 1.5) p. 3
Overview
Common needs recognized for all LUSI instruments inDiagnostics for measuring X-ray FEL properties
Transverse beam profile Incident beam intensityTransverse beam positionsWave field at focus
Optical components for performing X-ray FEL manipulationsBeam size definition and clean-upAttenuation Pulse pattern selection and/or repetition rate reductionIsolation of fundamental from high harmonicsFocusing Monochromatization
Common optics sp39100011-1_BeLens-PRD sp39100014-1_Slits-PRD sp39100010-1_Atten-PRD sp39100023-1_Pulse_Picker-PRD sp39100034-1_HarmRejMirror-PRD sp39100016-0_OffsetMono (in work)*
LUSI DOE Review Aug. 19, 2008Diagnostics/Optics (WBS 1.5) p. 13
DCO Physics Requirements (cont.)
Unique challenges for LUSI DCO (cont.)Capable of maintaining ultra-high mechanical stability in case of large optics-to-sample distance, i.e., XCS offset monochromator
To 10% of beam size at 50 m 0.25 rad pointing stability
LUSI DOE Review Aug. 19, 2008Diagnostics/Optics (WBS 1.5) p. 15
Component Descriptions (cont.)
Diagnostics suite (cont.)Intensity-position monitor(WBS 1.5.2.3)
RequirementsIn-situ, but retractable if desiredHighly transmissive (< 5% loss);Relative accuracy < 0.1%; Working dynamic range 1000;Position accuracy in xy < 10 m;Per-pulse op. at 120 Hz;
Wavefront monitor(WBS 1.5.2.1)
Requirements In-situ, but retractable if desiredVariable FOV and resolutionPer-pulse op. @ 120 HzAttenuation used if necessaryComputational algorithms needed for wavefront reconstruction
LUSI DOE Review Aug. 19, 2008Diagnostics/Optics (WBS 1.5) p. 18
Offset monochromator(WBS 1.5.3.1)
RequirementsLarge 600 mm offset6-25 keV energy range
Continuously tunable
10% positional stability (of beam size)Double-crystal geometryAttenuation used if necessary
Component Descriptions (cont.)
Common optics (cont.)Harmonic rejection mirrors(WBS 1.5.3.6)
Requirements Energy range btw 6 - 8.265 keV104 contrast ratio between fundamental and the 3rd harmonic, 106 overall80% overall throughput for the fundamentalMinimize wavefront distortionWithstand full FEL flux
LUSI DOE Review Aug. 19, 2008Diagnostics/Optics (WBS 1.5) p. 23
DCO Major Risks
Offset monochromatorMechanical stability not met
Required to maintain position stability to 10% of beam size Mitigation
Ensure requirements are clearly stated and agreed prior to award and fabrication Implement a stringent vendor selection process Implement regular visits to vendor Implement frequent and measurable status reports Maintain constant communication with the vendor prior to and during design and fabrication
LUSI DOE Review Aug. 19, 2008Diagnostics/Optics (WBS 1.5) p. 25
Summary
Diagnostics and common optics help support LUSI instruments to fulfill CD-0 mission in a wide variety of cutting edge research capabilities Diagnostic & optical components concepts are based on proven developments made at SPPS, FLASH, and SR sourcesSafety hazards have been identified in Hazard Analysis Report (HAR)Safety issues are considered at every step of design and fabrication process Scope of DCO components for XPP, CXI, and XCS instruments fully definedResource loaded schedule developed through end of projectPreliminary designs of key components are well advancedDCO and LUSI are ready for CD-2 approval