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Undulator Cavity BPM Design and Status

Undulator Cavity BPM Design and Status. X-Band Cavity BPM Overview. Cavity BPM system design Current status for prototype testing Planning for first article and production. LTU and Undulator BPM System Specification. In-Tunnel Electronics Block Diagram. X-Band Cavity BPM Design.

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Undulator Cavity BPM Design and Status

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  1. Undulator Cavity BPM Design and Status

  2. X-Band Cavity BPM Overview • Cavity BPM system design • Current status for prototype testing • Planning for first article and production

  3. LTU and Undulator BPM System Specification

  4. In-Tunnel Electronics Block Diagram

  5. X-Band Cavity BPM Design • SLAC selective coupling design utilized to reduce monopole mode • Solid Copper Body • WR-75 waveguide output • Waveguide transition brazed to body

  6. Prototype Cavity BPM Specification

  7. Dipole Cavity Design • Beam pipe radius = 5 mm • Cavity radius = 14.937 mm • Cavity gap = 3 mm • Distance beam axis to bottom of wg = 9.5 mm • Waveguide= 19.05 x 3 mm

  8. Monopole Cavity Design • Beam pipe radius = 5 mm • Cavity radius = 11.738 mm • Cavity gap = 2 mm • Coupling Slot = 4 x 2 mm • Shortest distance from cavity opening to bottom of waveguide=1.734 mm • Waveguide= 19.05 x 3 mm

  9. Cold Test Prototype • Non-vacuum cold test prototype • Removable end caps • Accelerates test fixture development and cold test procedures

  10. Vacuum Window Prototype Cold Test • Utilized standard CPI WR-75 window • Silver plated Kovar/Glass vacuum seal • Window cost $100 vs. $ 218 for Kaman coax feed thru • Insertion Loss < 0.2 dB • Return loss -20dB

  11. Waveguide Transitions Prototype Cold Test • Transitions E plane from 3 mm to 9.53 mm (standard WR-75) • Waveguide transition brazed to body • Insertion Loss < 0.2 dB • Return loss -20dB

  12. Before Soldering Transitions and Windows

  13. X-Band Cavity BPM Cold Test • Waveguide and windows soldered together • Unit is vacuum tight except for removable end caps • First data looks encouraging

  14. Monopole and Dipole Wideband Sweep

  15. Dipole Cavity Design

  16. Monopole Cavity Design

  17. Surface Finish Test • End caps and cavity finish received 32 finish (1 um) • Polishing Monopole cavity end cap to approx 0.1 um • Q improved from 444 to 682

  18. In-Tunnel Receiver Block Diagram

  19. Prototype Receiver Specification

  20. Miteq X-Band Low Noise Receiver • Existing product line • WR 75 Waveguide Interface • Low Noise Figure (2.7 dB) • Budgetary price for (3 channels) $6500.00

  21. Prototype X-Band Low Noise Receivers • Conversion gain 27.5 dB • Over 60 dB dynamic range • Noise Figure 2.5 dB • IF bandwidth 40-80 MHZ • Ready for ITS Installation

  22. Prototype Receiver Data

  23. Phase I Injector Test Stand ITS Install single X-Band Cavity and modified off-the-shelf down converter receiver Mount BPM on Piezo two-axis translation stage Phase II Bypass line or LEUTL test with PC gun Install three X-Band Cavities BPMs Bypass line test with PC gun to start June 06 BPM System Test Approach

  24. Injector Test Stand ITS Beam Parameters • Charge- 1 nC single-bunch • Bunch length- ~ 3 - 4 ps FWHM for ps laser • Spot size on final screen at 5.5 MeV ~ 0.75 mm rms, ps laser

  25. Phase I Data Acquisition Design Approach • Instrument three channel down converters with Struck SIS-3301-105 ADCs 14-bit • Single VME board will provide the data acquisition for 8 channels • Epics driver complete • Digitize horizontal, vertical position and Intensity 0 to 1 volt range • Fit Data to decaying exponential at 50 MHz

  26. Phase I Testing Objectives • Test prototype Cavity BPM, down converter, and data acquisition • Generate preliminary compliance table to specification • Gain operational experience to determine if translation stage is useful, what are optimum operating parameters

  27. Phase I Schedule Milestones • Design and develop prototype Cavity BPM • Prototype non vacuum • Jan 06 • Build single Cavity BPM • Feb 06 • Cold Test • Feb 06 • Install cavity BPM into ITS and Test • Feb 06

  28. Phase II Schedule Milestones • Refine design and develop First Article Cavity BPM and support hardware • March 06 • Build 3 Cavity BPMs • March 06 • Cold Test • May 06 • Install 3 cavity BPMs into APS PAR/Booster bypass line or LEUTL and Test • June 06

  29. Phase II Testing Objectives • First Article Prototypes evaluated • Test three BPM separated by fixed distance to determine single-shot • Complete test matrix

  30. LTU and Undulator Planning • Receiver and LO housed in shielded enclosure below girder 20 watt power dissipation maximum • Presently BPM output on wall side • BPM output flexible waveguide section allows movement for alignment

  31. BPM Mounting • BPM connects directly to the girder. • Mechanical adjustment stage used for alignment • BPM and Quad can be adjusted into position independent of one another

  32. Undulator Planning

  33. Production Phase • Production of 2 BPMs for LTU 04/07 • Production of 6 BPMs for undulator 04/07 • Production of 8 BPMs for undulator 06/07 • Production of 3 BPMs for LTU 06/07 • Production of 8 BPMs for undulator 08/07 • Production of 3 BPMs for LTU 08/07 • Production of 11 BPMs for undulator 10/07 • Spares 12/07

  34. Summary • X-Band Cavity BPM development ongoing • Brass body prototype (non-vacuum) • ITS prototype (vacuum) • Receiver Prototype ready for ITS installation • Parts are assembled and tested • Waveguide components received • Data Acquisition • SLAC providing constructive communications and collaboration

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