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X-Band Cavity BPM Development and Receiver Prototype Testing

This update provides information on the development of X-Band Cavity BPMs and the testing of receiver prototypes. The development phase is nearly complete, with prototypes assembled and tested successfully. Testing and qualification are ongoing, with production expected to begin soon.

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X-Band Cavity BPM Development and Receiver Prototype Testing

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  1. Undulator Cavity BPM System Status

  2. In-Tunnel Electronics Block Diagram

  3. X-Band Cavity BPM Development • Five X-Band Cavity BPM built and tested • Two qualified vendors for machined parts • Brazing procedure optimized to preserve tune • Tuning and testing procedures generated

  4. Prototype BPMs for 3-BPM test • 4 BPMs built and tested to support 3-BPM testing • Design and technology mature

  5. Port 1 Port 4 Port 2 Y-Port Port 3 Monopole mode X-Port Vertical dipole mode BPM Simulations • Cavity BPMs simulated in Microwave Studio, HFSS and Mafia • Test data indicates good agreement between simulated model and measured BPMs

  6. Prototype BPMs for 3-BPM test

  7. Cavity Cold Test • Critical tuning experience gained • Test fixtures designed and built for tuning before brazing • Post braze tuning minimized by pre-tuning and controlling braze process • Good correlation between cold test and beam test

  8. Tuning Pins Tuning Pins • Tuning pins improve performance and production yield • Tuning pins prototyped and tested • Tuning pin simulations verify measurements

  9. Cold Test After Brazing and Tuning

  10. Brazing Problems • Tuning Pins difficult to braze. • New braze fixtures designed and built • End Cap design being evaluated • Problems with window leaks • Window plating suspected

  11. Cavity BPM Development • R&D phase of near completion • Testing phase II expected completed by end of July • Entering production phase

  12. Receiver Development • X-Band down-converter developed from existing Miteq product • Modified to meet LCLS requirements • 3 channel receiver with common LO • 4 first article packaged receivers delivered and presently being tested

  13. X-Band Receiver System Features • Input RF Power Surge Limiters • Input DC power regulation • High/Low gain feature (28/0dB) to extend dynamic range • Integrated self-test • Multi-mode operation with phase locked LO to control system or free-run mode

  14. X-Band Receiver Packaging Design • Receiver enclosure 12.5 wide by 15 deep by 2.5 thick (inches) with integral heat sink • Houses input filters local oscillator and down-converter • 3-WR75 Inputs, 3-type “N” outputs, LO ref. input Type “N”, power and control cable

  15. X-Band Receiver Chassis • Line Replaceable Unit (LRU) design • Local status interface indicators for power, operational mode, gain range, self-test • Integral heat sink and EMI chassis design

  16. Dynamic Range Testing

  17. Frequency Response Sweep

  18. Receiver Electronics Development • R&D phase of near completion • Testing phase II expected completed by end of July • Test fixtures developed • Entering production phase

  19. BPM Testing • Non-Vacuum Single BPM cold test unit complete 04/06 • (Phase I) test in APS Injector Test Stand complete 09/06 • (Phase II) 3-BPM test in APS LEUTL • Complete test matrix to prove compliance to specification • Testing phase II expected completed by end of July

  20. LEUTL 3-BPM Test • PC gun installed and LEUTL tunnel commissioned • PC gun beam 325 MeV (400 pC) to dump • 33 Hor. and 23 Vert. micron normalized emittance • Compressed beam 1 ps bunch length

  21. In-Tunnel Progress • 2-axis translation stage installed and tested provide sub-micron controllable horizontal and vertical motion • Multiple experiments presently conducted to verify operation • Testing ongoing

  22. Electronics Stability Testing

  23. Single BPM Test

  24. 3-BPM Test Apparent X resolution 8 microns rms Courtesy Steve Smith

  25. Undulator System Layout Beam X-band receiver LRU

  26. Production Phase • Production of 2 BPMs for LTU 11/07 • Production of 6 BPMs for undulator 11/07 • Production of 10 BPMs for undulator 01/08 • Production of 11 BPMs for undulator 02/08 • Production of 7 BPMs for undulator 03/08 • Spares 4 BPMs 03/08

  27. Summary • X-Band Cavity BPM Development Nearly Complete • 4 Cavity BPM built and tested • Machining and braze critical tasks identified • BPM phase ll testing expected complete July 07 • Production procurement ongoing • Receiver Prototype Development Nearly Complete • First 4 prototypes assembled and tested with good results • 3-BPM testing prototypes incorporate receiver, local oscillator and filter first article packaging • Production procurement ongoing • Test Qualification • Collaborating with SLAC to test and qualify • Qualifying system with the same ADC (PAD) as SLAC LINAC BPM upgrade • Testing is ongoing at this time with promising results • Entering Production phase

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