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LCLS BPM Development and Testing

LCLS BPM Development and Testing. Bob Lill July 21, 2005. BPM System Test Approach. Phase I ( APS Injector Test Stand ITS) Install single X-Band Cavity and modified off-the-shelf down converter receiver. BPM mounted on Piezo two-axis translation stage Test to start Oct 05

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LCLS BPM Development and Testing

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  1. LCLS BPM Development and Testing Bob Lill July 21, 2005

  2. BPM System Test Approach • Phase I (APS Injector Test Stand ITS) • Install single X-Band Cavity and modified off-the-shelf down converter receiver. • BPM mounted on Piezo two-axis translation stage • Test to start Oct 05 • Phase II (APS PAR bypass line and test with PC gun) • Install three X-Band Cavities with first article down converter receivers in APS PAR bypass line and test with PC gun to start spring 06

  3. APS Injector Test Stand (ITS)

  4. ITS Ballistic Bunch Compression (BBC) Gun

  5. BPM Piezo Translator (100 micron range X/Y & 1 micron resolution) Mounted off Quad Mount

  6. ITS Beam Parameters • Charge per bunch     . ps laser:  up to ~ 1 nC with current cathode, single-bunch     . ns laser:  up to ~ 10 nC, 5-ns bunch train (Gaussian dist.)     . tc cathode:  ~ 1 mA average current over a 1.5 us • Macropulse   - beam energy:     . up to 6 MeV with cathode & 1 full cell powered     . up to 10 MeV with both full cells powered   • Spot size on final screen, at 5.5 MeV     . ~ 0.75 mm rms, ps laser     . ~ 4 mm rms, ns laser or thermionic cathode   - emittance, tbd (hopefully will measure this week)   - bunch length, tbd but probably 3 - 4 ps FWHM for ps laser

  7. System Specification

  8. X-Band Cavity with Down Converter Receiver

  9. Existing product line WR 75 Waveguide Interface Weatherproof design Low Noise Figure Presently developing specification for 3 channel prototype Budgetary price for prototype $6500.00 Miteq X-Band Low Noise Receiver

  10. Data Acquisition Design Approach • Phase I APS ITS • Leverage off the APS Injector BPM data acquisition • Instrument three channel down converters with Struck SIS-3301-105 ADCs 14-bit, 105 MSPS • Single VME board will provides the data acquisition for 8 channels • Epics driver complete

  11. Testing objectives • Phase I • Test prototype Cavity BPM, down converter, and data acquisition • Determine cross-talk • Generate preliminary compliance table to specification • Gain operational experience to determine if translation stage is useful, what are optimum operating parameters • Phase II • First Article Prototypes evaluated • Test three BPM separated by fixed TBD distance to determine single-shot • Complete test matrix

  12. Phase I R&D Schedule

  13. Phase I R&D Schedule

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