Bob Lill Undulator Systems – BPM [email protected] April 20, 2006 Undulator Cavity BPM...
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Transcript of Bob Lill Undulator Systems – BPM [email protected] April 20, 2006 Undulator Cavity BPM...
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
Undulator Cavity BPM Status and Plans
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
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 Diagnostics [email protected]
April 20, 2006
Vacuum Window Prototype
Utilized standard CPI WR-75 windowSilver plated Kovar/Glass vacuum sealWindow cost $100 vs. $ 218 for Kaman coax feed thruInsertion Loss < 0.2 dBReturn loss -20dB
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
Prototypes Bolted end caps Brazed end caps
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
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
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
Monopole and Dipole Wideband Sweep Bolted End Caps
Monopole Cavity Dipole Cavity antenna offset 2 mm
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
Dipole Wideband Sweep Brazed End Caps
Antenna Centered (null) Antenna Offset 0.5 mm
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
Dipole Cavity Data Parameter
(500 micron offset)
Predicted Value Measured prototype # 1
Bolted end caps
Measured prototype # 2
Brazed end capsFrequency (TM010) 8.262 GHz 8.271 GHz 8.243 GHz
Coupling (TM010) -53 dB -69 dB -62 dB
Frequency (TM110) 11.364 GHz 11.344 GHz 11.357 GHz
Coupling (TM110) -32 dB -28 dB -24 dB
Q (loaded) (TM110) 2704 2086 2391
Isolation X/Y (TM110) -26 dB -33 dB -23 dB
Isolation monopole to dipole cavity
< -80 dB < -85 dB < -89 dB
Frequency (TM020) 15.825 GHz 15.767 GHz 15.785 GHz
Coupling (TM020) -78 dB -64 dB -50 dB
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
2.54 micron step movements of antenna
Antenna Scan IF45 MHz Pin 14 dBm CW
0
10
20
30
40
50
60
70
-60 -40 -20 0 20 40 60
Position (microns)
Ou
tpu
t (m
V)
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
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
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
In-Tunnel Electronics Block Diagram
Attenuator/bandpassfilter
X-Band Cavity BPM
Dx
Dy
SUM
Attenuator/bandpass
filter
Magic Tee
Attenuator/bandpass
filter
Magic Tee
Low Noise Ampl
Power Limiter
Lowpass Filter
Amplifier
Low Noise Ampl
Power Limiter
Lowpass Filter
Amplifier
Low Noise Ampl
Power Limiter
Lowpass Filter
Amplifier
LO Ampl
Beam Synchronized local oscillator
IN-TUNNEL ELECTRONICS
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
Prototype Receiver Specification
Parameter Specification Limit
Condition
RF Frequency 11.364 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
1nC, 1mm offset, 200fs BL
LO Power Range +10 dBm Max. Provide LO for 3 down converters
IF Frequency 60 MHz Min. 20.0 +/- 0.56 Celsius
Noise Figure Dx and DY 2.7 dB Max. 20.0 +/- 0.56 Celsius
Noise Figure Intensity (reference) 4.0 dB Max. 20.0 +/- 0.56 Celsius
LO to RF Isolation 40 dB Min. 20.0 +/- 0.56 Celsius
LO to IF Isolation 45 dB Min. 20.0 +/- 0.56 Celsius
Output Power +14 dBm 1 dB compression
Conversion Gain 25 dB typical 20.0 +/- 0.56 Celsius
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
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 40-80 MHZ
Ready for ITS Installation
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
Prototype Receiver Data
0
50
100
1stQtr
3rdQtr
East
West
North
Power Sweep LO 8 dBm RF 11.364 GHz
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
-100 -80 -60 -40 -20 0
X-Band Power (dBm)
DC
Ou
tpu
t 60 M
Hz (
dB
m)
s/n 118994
27.5 dB
diff
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
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
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
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 Diagnostics [email protected]
April 20, 2006
BPM System Test Approach
Phase I
Injector Test Stand ITSInstall 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 Diagnostics [email protected]
April 20, 2006
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
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
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 Diagnostics [email protected]
April 20, 2006
Phase I Schedule Milestones
Design and develop prototype Cavity BPM Prototype non vacuum Cavity BPM complete
Build single Cavity BPMDelivered April 17, 2006
Cold Test and install cavity BPM into ITSApril 06
ITS TestingMay 06
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
Phase II Schedule Milestones
Refine design and develop First Article Cavity BPM and support hardware
June 06
Build 3 Cavity BPMsAugust 06
Cold TestSeptember 06
Install 3 cavity BPMs into APS PAR/Booster bypass line or LEUTL and Test
October 06
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
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 Diagnostics [email protected]
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 Diagnostics [email protected]
April 20, 2006
Production Phase
Production of 2 BPMs for LTU 04/07Production of 4 BPMs for undulator 04/07Production of 10 BPMs for undulator 06/07Production of 10 BPMs for undulator 08/07Production of 10 BPMs for undulator 10/07Spares 12/07
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
April 20, 2006
Summary
X-Band Cavity BPM development ongoingBolt-together prototype (non-vacuum) complete
ITS prototype (vacuum) preparing for ITS test
Receiver Prototype ready for ITS installationParts are assembled and tested
Waveguide components received
Data Acquisition and TestSLAC providing constructive communications and collaboration