1. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 1 LCLS Optical Diagnostics Design Design Review March 3, 2004 Jim Bailey, ANL, Mechanical Engineer A Work in Progress

2. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 2 Literature Survey: Initial Search Produced 45 Publications Related to Scanning Wires Reduced to 9 Relevant Publication Considering: Mechanical Engineering Design Small Beam Micron Size (Electron) Date Brief Review: SLAC Papers “A High Resolution Wire Scanner for Micron-Size….. C. Fields, et al, 1989. Mechanical Design of Wire Assembly “Wire Scanner for Beam Size and…….at the SLC” M.C. Ross, et al, 1991. Mechanical Design of Wire Assembly “Wire Breakage in SLC Wire Profile Monitors” C. Fields, et al, 1998. Theory for Wire Failure and Solutions “Analysis of a Novel Diffractive Scanning …….” R. Tatchyn, 1998. Design Concept for Scanning Wire in LCLS Scanning Wire --- Existing Technology

3. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 3 Other Papers “ Wire Scanners for Small Emittance Beam……… in ATF” H. Hayano, KEK, Japan, 1999. Mechanical Design of Wire Assembly and Positioners “A Methodfor Measuring Vibrations in Wire Scanner..” Naoka IIDA, et al, KEKB, Japan, 1998. Mechanical Design of Wire Assembly and Positioners “A Wire Scanning Type … …. for an Undulator Radiation” Xiaowei Zhang, et al, Japan, 1994. Mechanical Design and Thermal Analysis of Wire Assembly “Performance of Wire Scanner….. Racetrack Microtron” R.I. Cutler, et al, NBS-Los Alamos, 1987. Mechanical Design of Wire Assembly “Vibrating Wire Scanner for Beam Profile Monitoring” S.G. Arutunian, et al, Yerevan Physics Inst., 1999. Thermal Analysis of Wire Other Sources: Contacts at SLAC (E. Bong), APS, IPNS, SNS. Commercially Available Devices. Scanning Wire --- Existing Technology Continued

4. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 4 Positioner Requirements: Spacial Accuracy- (Beam Size, Sigma 25 Micron) Absolute -- 25 Micron Resolution – 1-5 Micron Linear Stroke -- 6mm fine travel, 100 mm course travel (typical) Speed and Acceleration – TBD (rep rate, detection scheme) Environment – Vacuum 1E-9 Torr, Ambient Temp. Radiation – TBD Limited Space Wire/Foil Assembly: Wire/Foil Properties - Diameter/Thickness -- 25 Microns Material -- Tungsten w/ Gold Plate, Graphite, Beryllium, Diamond Configurations -- Round, Rectangular, Plate Edge Wire/Foil Design Issues - Mounting -- Vibration -- Heating -- Max. Allowable Material Temp., Thermal Expansion and Cyclic Stress Radiation Damage X-Ray option-- Scanning Wire – Design Considerations

5. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 5

6. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 6

7. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 7

8. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 8 Feature: near normal reflection improves depth of field

9. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 9 Imaging Requirements: Field of View -- 6mm X 6mm Minimum Image Resolution --10 Microns rms (min. 5 Micron/Pixel) Camera -- Chip Size 1,200 X 1,200 Minimum (2MP) W/ Shielding (Lead or Tungsten) Optics (Light Transport) -- Screen Size Compatible w/ Camera CCD Spacial Resolution < = 10 Micron Upstream Filter -- Reduce Ambient Light (Background) Thin Foil Reduce Scattering OTR – Design Considerations

10. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 10 Geometry: Model— OTR -- Design Consideration

11. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 11 Engineering/Physics Analyses Radiation Issues -- Scattering from Wire/Foil Beam Scattering – Input to Thermal Analysis Thermal Analysis for Wire/Foil:

12. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 12 Engineering/Physics Analyses Continued

13. Pioneering Science and Technology Office of Science U.S. Department of Energy UNDULATOR SYSTEMS REVIEW MARCH 3-4, 2004 ARGONNE NATIONAL LAB. 13 Wire Scanner and OTR imager are the main diagnostics for the electron and X-Ray beam profiles in the LCLS Undulator. Conceptual design of the Wire-Scanner has been established, including X-Ray option. Component selection and initial quotation have started. OTR Imager is at conceptual stage. Preliminary thermal & geometry models for the above have been developed. Conclusion