Undulator Cavity BPM Status April 16 2007 Undulator
Undulator Cavity BPM Status April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Design Review Outline BPM System Design Overview Cavity Design Electronics and ADC Current status for phase II testing First article and production April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
LTU and Undulator BPM System Specification Parameter Specification Limit Condition Resolution < 1 m 0. 2 – 1. 0 n. C +/- 1 mm range Offset Stability < +/- 1 m 1 hour +/- 1 mm range 20. 0 +/- 0. 56 Celsius Offset Stability < +/- 3 m 24 hours +/- 1 mm range 20. 0 +/- 0. 56 Celsius Gain Error < +/- 10 % +/- 1 mm range 20. 0 +/- 0. 56 Celsius Dynamic Range, Position +/- 1 mm 10 mm diameter vacuum chamber Dynamic Range, Intensity > 14 d. B PC Gun 0. 2 – 1. 0 n. C April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
In-Tunnel Receiver Block Diagram April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Design Development ITS Test Unit First Article Design Cold Test Unit April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
X-Band Cavity BPM Design Each BPM has position cavity and reference cavity SLAC selective coupling design utilized to reduce monopole mode Iris couplers are precisely EDM into Solid Copper Body Waveguide transition brazed to body April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Tuning Pins Feature Added Tuning pins prototyped and tested in lab Tuning pin simulations verify lab measurements Tuning pins will improve performance and production yield April 16, 2007 Undulator Cavity BPM System Status Tuning Pins Bob Lill Blill@aps. anl. gov
Prototype BPMs for 3 -BPM test April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Polished and re-surfaced All 4 bodies need rework Argonne surface laboratory provided polishing and measurements of critical surfaces (0. 1 micron rms) 1 st unit brazed Altair Inc. April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Preliminary Cold Test fixtures designed and built for preliminary tuning before brazing Critical tuning experience gained Encouraging cold test results after rework/tuning April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Cold Test Before Brazing (11. 384 GHz Goal) Serial # R/01 01 Position 11. 359 11. 381 Cavity Freq. GHz) Reference 11. 367 11. 382 Cavity Freq. GHz) April 16, 2007 Undulator Cavity BPM System Status 02 03 11. 377 11. 381 11. 385 11. 407 Bob Lill Blill@aps. anl. gov
X-Band Receiver Development April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
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 downconverter 3 -WR 75 Inputs, 3 -type “N” outputs, LO ref. input Type “N”, power and control cable April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
X-Band Receiver Chassis 4 receivers chassis built and tested High/Low gain feature (28/0 d. B) to extend dynamic range Integrated self-test Multi-mode operation with phase locked LO April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
X-Band Receiver Chassis Line Replaceable Unit (LRU) design Local status interface indicators for power, operational mode, gain range, self-test Integral EMI chassis design April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Receiver Test Fixture Development Test fixture developed for bench testing Multi-mode operation with phase locked local oscillator or free-run test capabilities Test fixture inspected before operated April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Prototype Receiver Specification Parameter Specification Limit Condition RF Frequency 11. 384 GHz 20. 0 +/- 0. 56 Celsius Dx, Dy, Intensity Input Peak Power 50 watts peak No damage (limiter protection) LO Frequency 11. 424 GHz (2856 MHz*4) 20. 0 +/- 0. 56 Celsius 1 n. C, 1 mm offset, 200 fs BL LO Power Range +10 d. Bm Max. Provide LO for 3 down converters IF Frequency 50 MHz Min. 20. 0 +/- 0. 56 Celsius Noise Figure Dx and DY 2. 7 d. B Max. 20. 0 +/- 0. 56 Celsius Noise Figure Intensity (reference) 4. 0 d. B Max. 20. 0 +/- 0. 56 Celsius LO to RF Isolation 40 d. B Min. 20. 0 +/- 0. 56 Celsius LO to IF Isolation 45 d. B Min. 20. 0 +/- 0. 56 Celsius Output Power +14 d. Bm 1 d. B compression Conversion Gain 25 d. B typical 20. 0 +/- 0. 56 Celsius April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Dynamic Range Testing April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
System Response Frequency Sweep April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
BPM System Test Approach Phase I Injector Test Stand ITS Install single X-Band Cavity and modified offthe-shelf down converter receiver Mount BPM on two-axis translation stage April 16, 2007 Undulator Cavity BPM System Status Phase II LEUTL test with PC gun Install three X-Band Cavities BPMs Mount all 3 BPMs together on a two-axis translation stage Bob Lill Blill@aps. anl. gov
Injector Test Stand (ITS) Beam Parameters Charge- 1 n. C singlebunch Bunch length- ~ 3 - 4 ps FWHM for ps laser Spot size on final screen at 5. 5 Me. V ~ 0. 75 mm rms, ps laser April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
(Phase I) ITS BPM Test Results BPM setup on X/Y translation stage Aligned BPM Pitch and Yaw to < 25 m Initial beam spot size 2 -3 mm rms at low charge (0. 05 n. C) at faraday cup before adding new focusing magnets to reduce to 200 um rms Beam stability limited to 50 m rms. Laser improvements ongoing April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Prototype Cold Test (Dipole cavity 500 micron offset) Parameter (500 µm offset) Frequency TM 010 Predicted Measured Prototype # 1 bolted end caps Measured Prototype # 2 brazed end caps 8. 262 GHz 8. 271 GHz 8. 243 GHz -53 d. B -69 d. B -62 d. B 11. 364 GHz 11. 344 GHz 11. 357 GHz -32 d. B -28 d. B -24 d. B Q (loaded) TM 110 2704 2086 2391 X/Y Isolation TM 110 -26 d. B -33 d. B -23 d. B Dipole to Monopole cavity Isolation <-80 d. B <-85 d. B <-89 d. B 15. 825 GHz 15. 767 GHz 15. 785 GHz -78 d. B -64 d. B -50 d. B Coupling TM 010 Frequency TM 110 Coupling TM 110 Frequency TM 020 Coupling TM 020 April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
ITS Data Processing Development Cavity BPM and electronics tested using ITS beam line First raw cavity voltage outputs captured on scope 6/9/06 Mover system calibration April 16, 2007 Undulator Cavity BPM System Status Hor. Ref. Vert. Bob Lill Blill@aps. anl. gov
Waveforms acquired with sampling scope and processed via Epics April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Phase II Testing Objectives 3 BPM Test three BPM separated by fixed distance to determine single-shot Evaluate First Article Prototypes Complete test matrix to prove compliance to specification April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
In-Tunnel Progress 2 -axis translation stage installed and tested Stages provide submicron controllable horizontal and vertical motion Multiple experiments planned to verify operation April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
LEUTL 3 BPM Test Readiness Mid-May Testing Scheduled PC gun beam 325 Me. V to dump 33 Hor. and 23 Vert. micron normalized emittance Compressed beam less than 1 ps April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
SLAC ADC Development The PAD (Phase and Amplitude Detector) being considered for Cavity BPM ADC Linear Technologies LTC 2208 16 bit digitizer chip specified to run up to 130 MHz April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Stability Testing April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
PAD Dynamic Range April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
System Layout and Planning Beam X-band receiver LRU April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
BPM SUT Hardware Cavity BPM mounted for SUT testing Receiver mounting hardware prototyped April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Production Schedule April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Production Phase Production of 2 BPMs for LTU 07/07 Production of 6 BPMs for undulator 07/07 Production of 10 BPMs for undulator 09/07 Production of 11 BPMs for undulator 11/07 Production of 7 BPMs for undulator 01/08 Spares 4 BPMs 01/08 April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
Summary X-Band Cavity BPM Development Ongoing 4 Cavity BPM machined 1 st unit waiting brazed 3 other units are being brazed 3 -BPM test planned for mid-May Receiver Prototype Development 3 -BPM test prototype design incorporates high/low gain, self-test and final packaging First 4 Prototypes assembled with good results Data Acquisition and Test Collaborating with SLAC to use the same ADC as SLAC LINAC BPM upgrade Testing is on going at this time with promising results April 16, 2007 Undulator Cavity BPM System Status Bob Lill Blill@aps. anl. gov
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