undulator cavity bpm design and status
DESCRIPTION
Undulator Cavity BPM Design and Status. X-Band Cavity BPM Overview. Cavity BPM system design Current status for prototype testing Planning for first article and production. LTU and Undulator BPM System Specification. In-Tunnel Electronics Block Diagram. X-Band Cavity BPM Design. - PowerPoint PPT PresentationTRANSCRIPT
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
Undulator Cavity BPM Design and Status
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
X-Band Cavity BPM Overview
Cavity BPM system design
Current status for prototype testing
Planning for first article and production
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
LTU and Undulator BPM System Specification
Parameter Specification Limit
Condition
Resolution < 1m 0.2 – 1.0 nC
+/- 1 mm range
Offset Stability < +/- 1m 1 hour
+/- 1 mm range
20.0 +/- 0.56 Celsius
Offset Stability < +/- 3m 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 dB PC Gun
0.2 – 1.0 nC
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 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]
January 31, 2006
X-Band Cavity BPM Design
SLAC selective coupling design utilized to reduce monopole mode
Solid Copper Body
WR-75 waveguide output
Waveguide transition brazed to body
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
Prototype Cavity BPM Specification
Parameter Specification Limit
Condition
TM110 Frequency
Dipole Cavity
11.364 GHz 20.0 +/- 0.56 Celsius
Loaded Q factor
Dipole Cavity
3000
+/- 200
20.0 +/- 0.56 Celsius
Power Output TM110
Dipole Cavity
-10 dBm 20.0 +/- 0.56 Celsius
1nC, 1mm offset, 200fs BL
X/Y Cross Talk
Dipole Cavity
< -20 dB +/- 1 mm range
20.0 +/- 0.56 Celsius
TM011 Frequency
Monopole Cavity
11.364 GHz 20.0 +/- 0.56 Celsius
Loaded Q factor
Monopole Cavity
3000
+/- 200
20.0 +/- 0.56 Celsius
Power Output TM011
Monopole Cavity
-10 dBm 20.0 +/- 0.56 Celsius
1nC, +/-1mm offset range, 200fs BL
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 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]
January 31, 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]
January 31, 2006
Cold Test Prototype
Non-vacuum cold test prototype
Removable end caps
Accelerates test fixture development and cold test procedures
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
Vacuum Window Prototype Cold Test
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]
January 31, 2006
Waveguide Transitions Prototype Cold Test
Transitions E plane from 3 mm to 9.53 mm (standard WR-75)
Waveguide transition brazed to body
Insertion Loss < 0.2 dB
Return loss -20dB
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
Before Soldering Transitions and Windows
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
X-Band Cavity BPM Cold Test
Waveguide and windows soldered together
Unit is vacuum tight except for removable end caps
First data looks encouraging
Dipole Cavity Horizontal Scan
-80.0
-70.0
-60.0
-50.0
-40.0
-30.0
-20.0
-10.0
0.0
-1000 -800 -600 -400 -200 0 200 400 600 800 1000
Position (Microns)
Ou
tpu
t (d
B)
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
Monopole and Dipole Wideband Sweep
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
Dipole Cavity Design
Electrical Parameters
Predicted Measured
Frequency 11.364 GHz 11.345 GHz
Voltage Output 2.77 mV/nC/µm TBD
Q loaded 2838 400
Beta coupling 0.334 TBD
X/Y coupling -20 dB -35 dB
Temperature Drift 168 KHz/C TBD
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
Monopole Cavity Design
Electrical Parameters
Predicted Measured
Frequency 11.364 GHz 11.427 GHz
Voltage Output 6.2 V/nC TBD
Q loaded 2645 444
Beta coupling 0.096 TBD
R/Q normalized shunt impedance
36.5 ohms TBD
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
Surface Finish Test
End caps and cavity finish received 32 finish (1 um)
Polishing Monopole cavity end cap to approx 0.1 um
Q improved from 444 to 682
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
In-Tunnel Receiver Block Diagram
Dx
Dy
SUM
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
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 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]
January 31, 2006
Miteq X-Band Low Noise Receiver
Existing product line
WR 75 Waveguide Interface
Low Noise Figure (2.7 dB)
Budgetary price for (3 channels) $6500.00
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 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]
January 31, 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]
January 31, 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 to start June 06
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 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]
January 31, 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]
January 31, 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]
January 31, 2006
Phase I Schedule Milestones
Design and develop prototype Cavity BPM Prototype non vacuum
Jan 06
Build single Cavity BPMFeb 06
Cold TestFeb 06
Install cavity BPM into ITS and TestFeb 06
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
Phase II Schedule Milestones
Refine design and develop First Article Cavity BPM and support hardware
March 06
Build 3 Cavity BPMsMarch 06
Cold TestMay 06
Install 3 cavity BPMs into APS PAR/Booster bypass line or LEUTL and Test
June 06
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
Phase II Testing Objectives
First Article Prototypes evaluatedTest three BPM separated by fixed distance
to determine single-shot Complete test matrix
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 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]
January 31, 2006
BPM Mounting
BPM connects directly to the girder.
Mechanical adjustment stage used for alignment
BPM and Quad can be adjusted into position independent of one another
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
Production Phase
Production of 2 BPMs for LTU 04/07Production of 6 BPMs for undulator 04/07Production of 8 BPMs for undulator 06/07Production of 3 BPMs for LTU 06/07Production of 8 BPMs for undulator 08/07Production of 3 BPMs for LTU 08/07Production of 11 BPMs for undulator 10/07Spares 12/07
Bob Lill
Undulator Systems – BPM Diagnostics [email protected]
January 31, 2006
Summary
X-Band Cavity BPM development ongoingBrass body prototype (non-vacuum)
ITS prototype (vacuum)
Receiver Prototype ready for ITS installationParts are assembled and tested
Waveguide components received
Data AcquisitionSLAC providing constructive communications and collaboration