Bob Lill Undulator Systems – BPM April 20, 2006 Undulator Cavity BPM Status and Plans

Bob Lill Undulator Systems – BPM April 20, 2006 X-Band Cavity BPM Development Removable end cap prototype built and tested Cold test fixtures and measurement procedures generated ITS prototype unit received and presently being cold tested

Bob Lill Undulator Systems – BPM April 20, 2006 Vacuum Window Prototype 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

Bob Lill Undulator Systems – BPM April 20, 2006 Prototypes Bolted end capsBrazed end caps

Bob Lill Undulator Systems – BPM April 20, 2006 Dipole Cavity Design Beam pipe radius = 5 mm Cavity radius = mm Cavity gap = 3 mm Distance beam axis to bottom of wg = 9.5 mm Waveguide= x 3 mm

Bob Lill Undulator Systems – BPM April 20, 2006 Monopole and Dipole Wideband Sweep Bolted End Caps Monopole CavityDipole Cavity antenna offset 2 mm

Bob Lill Undulator Systems – BPM April 20, 2006 Dipole Wideband Sweep Brazed End Caps Antenna Centered (null) Antenna Offset 0.5 mm

Bob Lill Undulator Systems – BPM April 20, 2006 Dipole Cavity Data Parameter (500 micron offset) Predicted ValueMeasured prototype # 1 Bolted end caps Measured prototype # 2 Brazed end caps Frequency (TM010)8.262 GHz8.271 GHz8.243 GHz Coupling (TM010)-53 dB-69 dB-62 dB Frequency (TM110) GHz GHz GHz Coupling (TM110)-32 dB-28 dB-24 dB Q (loaded) (TM110) Isolation X/Y (TM110)-26 dB-33 dB-23 dB Isolation monopole to dipole cavity < -80 dB< -85 dB< -89 dB Frequency (TM020) GHz GHz GHz Coupling (TM020)-78 dB-64 dB-50 dB

Bob Lill Undulator Systems – BPM April 20, micron step movements of antenna

Bob Lill Undulator Systems – BPM April 20, 2006 Monopole Cavity Design Beam pipe radius = 5 mm Cavity radius = mm Cavity gap = 2 mm Coupling Slot = 4 x 2 mm Shortest distance from cavity opening to bottom of waveguide=1.734 mm Waveguide= x 3 mm

Bob Lill Undulator Systems – BPM April 20, 2006 In-Tunnel Electronics Block Diagram

Bob Lill Undulator Systems – BPM April 20, 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 – BPM April 20, 2006 Prototype X-Band Low Noise Receivers Conversion gain 27.5 dB Over 60 dB dynamic range Noise Figure 2.5 dB IF bandwidth MHZ Ready for ITS Installation

Bob Lill Undulator Systems – BPM April 20, 2006 Prototype Receiver Data

Bob Lill Undulator Systems – BPM April 20, 2006 Phase I Data Acquisition Design Approach Instrument three channel down converters with Struck SIS 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

Bob Lill Undulator Systems – BPM April 20, 2006 Lab Data Acquisition Development Cavity BPM and electronics tested using an impulse generator Optimization algorithm used to find best fit Comparing fits from 5 GHz sampling scope 100 MHz sampling 5 GHz sampling scope

Bob Lill Undulator Systems – BPM April 20, 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 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

Bob Lill Undulator Systems – BPM April 20, 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 – BPM April 20, 2006 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

Bob Lill Undulator Systems – BPM April 20, 2006 Phase I Schedule Milestones Design and develop prototype Cavity BPM Prototype non vacuum Cavity BPM complete Build single Cavity BPM Delivered April 17, 2006 Cold Test and install cavity BPM into ITS April 06 ITS Testing May 06

Bob Lill Undulator Systems – BPM April 20, 2006 Phase II Schedule Milestones Refine design and develop First Article Cavity BPM and support hardware June 06 Build 3 Cavity BPMs August 06 Cold Test September 06 Install 3 cavity BPMs into APS PAR/Booster bypass line or LEUTL and Test October 06

Bob Lill Undulator Systems – BPM April 20, 2006 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

Bob Lill Undulator Systems – BPM April 20, 2006 Design Enhancements for Manufacturing Tuning Pins to tweak frequency and isolation Strengthen end caps to reduce mechanical deflection Increase braze surface on end cap to body interface

Bob Lill Undulator Systems – BPM April 20, 2006 Production Phase Production of 2 BPMs for LTU 04/07 Production of 4 BPMs for undulator 04/07 Production of 10 BPMs for undulator 06/07 Production of 10 BPMs for undulator 08/07 Production of 10 BPMs for undulator 10/07 Spares 12/07

Bob Lill Undulator Systems – BPM April 20, 2006 Summary X-Band Cavity BPM development ongoing Bolt-together prototype (non-vacuum) complete ITS prototype (vacuum) preparing for ITS test Receiver Prototype ready for ITS installation Parts are assembled and tested Waveguide components received Data Acquisition and Test SLAC providing constructive communications and collaboration