RF BPM Status
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Transcript RF BPM Status
Undulator Cavity BPM
Status
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
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
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
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
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
BPM System Overview Block Diagram
IN-TUNNEL
ELECTRONICS
X-Band Cavity BPM
Vertical
Reference
cavity
Attenuator/
bandpass
filter
Dipole
cavity
Horizontal
Attenuator/
bandpass
filter
Power
Limiter
Lowpass
Filter
Low Noise Ampl
Power
Limiter
Amplifier
Lowpass
Filter
Low Noise Ampl
To
ADC
Amplifier
Termination
Reference
Attenuator/
bandpass
filter
Power
Limiter
Lowpass
Filter
Low Noise Ampl
Amplifier
Phase Locked
Local oscillator
2856 MHz Local
Oscillator
119 MHz Beam
Synchronized
Reference
October 12, 2006
Undulator Systems – Cavity BPM Status
LO Ampl
Power
Distribution
and Control
15 Volts/
control I/O
Bob Lill
[email protected]
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
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
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
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
Before and After Brazing
(ITS Prototype)
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
Prototype Cold Test
(Dipole cavity 500 micron offset)
Parameter
(500 µm offset)
Frequency TM010
Predicted
Measured
Prototype # 1
bolted end caps
Measured
Prototype # 2
brazed end caps
8.262 GHz
8.271 GHz
8.243 GHz
-53 dB
-69 dB
-62 dB
11.364 GHz
11.344 GHz
11.357 GHz
-32 dB
-28 dB
-24 dB
Q (loaded) TM110
2704
2086
2391
X/Y Isolation TM110
-26 dB
-33 dB
-23 dB
Dipole to Monopole
cavity Isolation
<-80 dB
<-85 dB
<-89 dB
15.825 GHz
15.767 GHz
15.785 GHz
-78 dB
-64 dB
-50 dB
Coupling TM010
Frequency TM110
Coupling TM110
Frequency TM020
Coupling TM020
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
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) $6500.00
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
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
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
In-Tunnel Receiver Block Diagram
Dx
Power
Limiter
Lowpass
Filter
Low Noise Ampl
SUM
Power
Limiter
Amplifier
Lowpass
Filter
Low Noise Ampl
Dy
Power
Limiter
Amplifier
Lowpass
Filter
Low Noise Ampl
Amplifier
Beam
Synchronized
local oscillator
LO Ampl
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
Prototype X-Band Low Noise Receivers
Power Sweep LO 8 dBm RF 11.364 GHz
100
30
20
10
DC Output 60 MHz (dBm)
Conversion gain 28 dB
Over 60 dB dynamic range
Noise Figure 2.5 dB
IF bandwidth 40-80 MHz
Receiver noise floor -88
dBm assuming 20 MHz IF
bandwidth
Cavity BPM Sensitivity:
-54 dBm/0.2nC/1m
-100
50
-80
0
-60
-40
-20
-20
Undulator Systems – Cavity BPM Status
0
East
West
North
s/n 118994
27.5 dB
-30
0
-40
1st
Qtr
3rd
Qtr
X-Band Pow er (dBm)
October 12, 2006
-10
Bob Lill
[email protected]
-50
-60
-70
-80
diff
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
October 12, 2006
Undulator Systems – Cavity BPM 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
[email protected]
Injector Test Stand (ITS) Beam Parameters
Charge- 1 nC singlebunch
Bunch length- ~ 3 - 4
ps FWHM for ps laser
Spot size on final
screen at 5.5 MeV
~ 0.75 mm rms, ps
laser
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
(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
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
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 shutdown
October 12, 2006
Undulator Systems – Cavity BPM Status
Hor.
Ref.
Vert.
Bob Lill
[email protected]
ITS Data Processing Development
ITS Scan Hor vs Vert 0.33 nC
350
300
Vout (mV)
250
200
Hor
Vert
150
100
50
0
-1500
-1000
-500
0
500
1000
1500
Posistion (microns)
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
Waveforms acquired with sampling scope and
processed via Epics
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
Normalized waveforms 0.05 nC charge
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
Dipole Cavity Preliminary Test Data
Parameter
Predicted Value
Cold Test Data
ITS Test Data
Frequency (TM110)
11.364 GHz
11.357 GHz
11.359 GHz
Q (loaded) (TM110)
2704
2391
2500
Isolation X/Y (TM110)
-26 dB
-23 dB
< -20 dB
Voltage Output
2.3 mV/um/nC
October 12, 2006
Undulator Systems – Cavity BPM Status
1.22 mV/um/nC
Bob Lill
[email protected]
(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
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
Prototype Phase II Cavity BPM Specification
Parameter
Specification
Limit (change)
Condition
TM110 Frequency
Dipole Cavity
11.364 GHz
(11.384 GHz)
20.0 +/- 0.56 Celsius
Loaded Q factor
Dipole Cavity
3000 +/- 200
(3500 +/- 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
(<-26 dB)
+/- 1 mm range
20.0 +/- 0.56 Celsius
TM010 Frequency
Monopole Cavity
11.364 GHz
(11.374 GHz)
20.0 +/- 0.56 Celsius
Loaded Q factor
Monopole Cavity
3000+/- 200
(3500 +/- 200)
20.0 +/- 0.56 Celsius
Power Output TM010
Monopole Cavity
-10 dBm
20.0 +/- 0.56 Celsius
1nC, +/-1mm offset range, 200fs BL
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
Dipole Cavity Design
Beam pipe radius = 5 mm
Cavity radius = 14.937
mm (14.888 mm)
Cavity gap = 3 mm
Distance beam axis to
bottom of wg = 9.5 mm
(10.5 mm)
Waveguide= 19.05 x 3 mm
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
Monopole Cavity Design
Beam pipe radius = 5 mm
Cavity radius = 11.738 mm
(11.477 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= 19.05 x 3 mm
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
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
October 12, 2006
Undulator Systems – Cavity BPM Status
Tuning Pins
Bob Lill
[email protected]
Design Development
ITS Test Unit
First Article Design
Cold Test Unit
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
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
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
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 downconverter
3-WR75 Inputs, 3-type “N”
outputs, LO ref. input Type
“N”, power and control
cable
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
SLAC ADC Development
The PAD (Phase and
Amplitude Detector)
being considered for
Cavity BPM ADC
Linear Technologies
LTC2208 16 bit
digitizer chip specified
to run up to 130MHz
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
Phase II Data Acquisition Design Approach
Instrument three BPMs with SLAC Built 16bit, 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
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
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
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
System Layout and Planning
Beam
X-band receiver LRU
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
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
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]
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
October 12, 2006
Undulator Systems – Cavity BPM Status
Bob Lill
[email protected]