Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Undulator Cavity BPM Status

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Design Review Outline BPM System Design Overview Cavity Design Electronics and ADC Current status for phase I prototype testing Planning phase II prototype test First article and production

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 LTU and Undulator BPM System Specification ParameterSpecification Limit Condition Resolution < 1  m 0.2 – 1.0 nC +/- 1 mm range Offset Stability < +/- 1  m 1 hour +/- 1 mm range / Celsius Offset Stability < +/- 3  m 24 hours +/- 1 mm range / Celsius Gain Error< +/- 10 %+/- 1 mm range / Celsius Dynamic Range, Position+/- 1 mm10 mm diameter vacuum chamber Dynamic Range, Intensity> 14 dBPC Gun 0.2 – 1.0 nC

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 BPM System Overview Block Diagram

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 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

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Cold Test Prototype Non-vacuum cold test prototype Accelerated design verification and cold test development Removable end caps Presently used to verify tuning effects and test fixture development

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Before and After Brazing (ITS Prototype)

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Prototype Cold Test (Dipole cavity 500 micron offset) Parameter (500 µm offset) PredictedMeasured Prototype # 1 bolted end caps Measured Prototype # 2 brazed end caps Frequency TM GHz8.271 GHz8.243 GHz Coupling TM dB-69 dB-62 dB Frequency TM GHz GHz GHz Coupling TM dB-28 dB-24 dB Q (loaded) TM X/Y Isolation TM dB-33 dB-23 dB Dipole to Monopole cavity Isolation <-80 dB<-85 dB<-89 dB Frequency TM GHz GHz GHz Coupling TM dB-64 dB-50 dB

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Baseline Design for Phase I Prototype Miteq X-Band Low Noise Receiver Existing product line WR 75 Waveguide Interface Low Noise Figure (2.7 dB) Budgetary price for (3 channels) $

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Prototype Receiver Specification ParameterSpecification Limit Condition RF Frequency GHz20.0 +/ Celsius Dx, Dy, Intensity Input Peak Power50 watts peakNo damage (limiter protection) LO Frequency GHz (2856 MHz*4) / Celsius 1nC, 1mm offset, 200fs BL LO Power Range+10 dBm Max.Provide LO for 3 down converters IF Frequency60 MHz Min / Celsius Noise Figure Dx and DY2.7 dB Max / Celsius Noise Figure Intensity (reference)4.0 dB Max / Celsius LO to RF Isolation40 dB Min / Celsius LO to IF Isolation45 dB Min / Celsius Output Power+14 dBm1 dB compression Conversion Gain25 dB typical20.0 +/ Celsius

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 In-Tunnel Receiver Block Diagram

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Prototype X-Band Low Noise Receivers Conversion gain 28 dB Over 60 dB dynamic range Noise Figure 2.5 dB IF bandwidth MHz Receiver noise floor -88 dBm assuming 20 MHz IF bandwidth Cavity BPM Sensitivity: -54 dBm/0.2nC/1  m

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 BPM System Test Approach Phase I Injector Test Stand ITS Install single X-Band Cavity and modified off- the-shelf down converter receiver Mount BPM on two-axis translation stage 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 Undulator Systems – Cavity BPM October 12, 2006 Injector Test Stand (ITS) Beam Parameters Charge- 1 nC single- bunch Bunch length- ~ ps FWHM for ps laser Spot size on final screen at 5.5 MeV ~ 0.75 mm rms, ps laser

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 (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 nC) at faraday cup before adding new focusing magnets to reduce to 200 um rms Beam stability limited to 50  m rms. Laser improvements ongoing

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 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 Testing is on-going following Aug/Sep shut- down Ref. Hor. Vert.

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 ITS Data Processing Development

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Waveforms acquired with sampling scope and processed via Epics

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Normalized waveforms 0.05 nC charge

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Dipole Cavity Preliminary Test Data ParameterPredicted ValueCold Test DataITS Test Data Frequency (TM110) GHz GHz GHz Q (loaded) (TM110) Isolation X/Y (TM110)-26 dB-23 dB< -20 dB Voltage Output2.3 mV/um/nC1.22 mV/um/nC

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 (Phase II) 3 BPM Test Schedule Milestones Refine design and develop First Article Cavity BPM and support hardware August 06 Start 3 BPMs October 06 First unit with accelerated delivery October 06 Install 3 cavity BPMs into APS LEUTL and Test December 06

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Prototype Phase II Cavity BPM Specification ParameterSpecification Limit (change) Condition TM110 Frequency Dipole Cavity GHz ( GHz) / Celsius Loaded Q factor Dipole Cavity /- 200 (3500 +/- 200) / Celsius Power Output TM110 Dipole Cavity -10 dBm20.0 +/ Celsius 1nC, 1mm offset, 200fs BL X/Y Cross Talk Dipole Cavity < -20 dB (<-26 dB) +/- 1 mm range / Celsius TM010 Frequency Monopole Cavity GHz ( GHz) / Celsius Loaded Q factor Monopole Cavity 3000+/- 200 (3500 +/- 200) / Celsius Power Output TM010 Monopole Cavity -10 dBm20.0 +/ Celsius 1nC, +/-1mm offset range, 200fs BL

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Dipole Cavity Design Beam pipe radius = 5 mm Cavity radius = mm ( mm) Cavity gap = 3 mm Distance beam axis to bottom of wg = 9.5 mm (10.5 mm) Waveguide= x 3 mm

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Monopole Cavity Design Beam pipe radius = 5 mm Cavity radius = mm ( mm) Cavity gap = 2 mm (3 mm) Coupling Slot = 2 x 4 mm (2.5 x 4 mm) Tangent to surface of cavity opening to bottom of waveguide=1.734 mm (3.75 mm) Waveguide= x 3 mm

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 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 Tuning Pins

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Design Development Cold Test Unit ITS Test Unit First Article Design

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Receiver Design Changes Packaged 3 channel receiver High/Low gain feature (28/0dB) to extend dynamic range. Add a simple CW tone self-test feature

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Receiver Packaging Design Receiver enclosure 12.5 wide by 11 deep by 2.5 thick (inches) with radiation shield cover Houses input filters local oscillator and down- converter 3-WR75 Inputs, 3-type “N” outputs, LO ref. input Type “N”, power and control cable

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 SLAC ADC Development The PAD (Phase and Amplitude Detector) being considered for Cavity BPM ADC Linear Technologies LTC bit digitizer chip specified to run up to 130MHz

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Phase II Data Acquisition Design Approach Instrument three BPMs with SLAC Built 16- bit, 130 MSPS digitizers (PAD) Epics driver available Synchronize ADC clock with 119 MHz Digitize horizontal, vertical position and Intensity 0 to 1 volt range Digital down convert 40 MHz IF decaying exponentials

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Phase II Testing Objectives 3 BPM Test Test three BPM separated by fixed distance to determine single-shot Evaluate First Article Prototypes Complete test matrix to prove compliance to specification

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 System Layout and Planning X-band receiver LRU Beam

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Production Phase Production of 2 BPMs for LTU 04/07 Production of 6 BPMs for undulator 04/07 Production of 9 BPMs for undulator 06/07 Production of 9 BPMs for undulator 08/07 Production of 10 BPMs for undulator 10/07 Spares 12/07

Bob Lill Undulator Systems – Cavity BPM October 12, 2006 Summary X-Band Cavity BPM development ongoing Bolt-together prototype (non-vacuum) complete ITS prototype testing ongoing 3 BPM test prototype design enhancements ongoing Receiver Prototype Development First Prototype installed in ITS with good results 3 BPM test prototype design incorporates high/low gain, self-test and final packaging Data Acquisition and Test Collaborating with SLAC to use the same ADC as SLAC LINAC BPM upgrade