Transcript RF BPM Status and Testing

LCLS Cavity BPM
Status and Testing
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
In-Tunnel Electronics Block Diagram
IN-TUNNEL
ELECTRONICS
Low Gain
Bypass
X-Band Cavity BPM
Vertical
Reference
cavity
Attenuator/
bandpass
filter
Dipole
cavity
Ib
Horizontal
Attenuator/
bandpass
filter
Power
Limiter
Low Noise Ampl
Attenuator/
bandpass
filter
Vertical
Lowpass
Filter
Horizontal
Lowpass
Filter
Reference
IF Amplifier
Low Gain
Bypass
Power
Limiter
Low Noise Ampl
IF Amplifier
Low Gain
Bypass
Termination
Reference
Lowpass
Filter
Power
Limiter
Low Noise Ampl
IF Amplifier
Phase Locked
Local oscillator
11.424 GHz
Local Oscillator
119 MHz Beam
Synchronized
Reference
October 30, 2007
FAC meeting Cavity BPM
LO Ampl
Power
Distribution
and Control
15 Volts/
control I/O
Bob Lill
[email protected]
40 MHz IF
signals
To
ADC
Cavity BPM Development
R&D phase completed
Testing phase II completed
Entering production phase
Cold Test
1st Generation
October 30, 2007
FAC meeting Cavity BPM
ITS Test
2nd Generation
3-BPM Test
First Article
Bob Lill
[email protected]
X-Band Cavity BPM Development
Five X-Band Cavity
BPM built and tested
Two qualified vendors
for machined parts
Brazing procedure
optimized to preserve
tune
Tuning and testing
procedures generated
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
BPM Simulations
Cavity BPMs simulated in Microwave Studio,
HFSS and Mafia
Test data indicates good agreement between
simulated model and measured BPMs
Port
1
Port
4
YPort
Port
2
Mono
pole
mode
XPort
Vertical
dipole
mode
Port
3
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Prototype BPMs for 3-BPM test
4 BPMs built and tested to support 3-BPM testing
Design and technology mature
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Cold Test After Brazing
and Tuning
Serial #
Dipole
Freq. (GHz)
Dipole
Loaded Q
Monopole
Freq. (GHz)
Monopole
Loaded Q
Design Goal
11.384
3550
11.384
3695
R/0
11.384
3310
11.384
3437
001
11.374
3250
11.382
3372
002
11.376
3500
11.383
3436
003
11.377
3371
11.400
3200
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
New End Cap
End-cap design
mechanically strengthen
Can retune once flange is
installed
Tuning pins are protected
against accidental
mistuning
New end-cap designed
and tested
Vacuum flange test
prototype pending
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Cavity BPM Production Status
Cavity BPM machining contracts placed with
parts expected 11/27/07
Two vendors will provide a single machined
First Article BPM for evaluation
Vacuum window first lot delivery 11/12/07
Vendor for brazing BPM pending contract
award
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Receiver Electronics Development
R&D phase complete
Test fixtures developed
Entering production phase
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Receiver Development
X-Band down-converter
developed from existing
Miteq product
Modified to meet LCLS
requirements
3 channel receiver with
common LO
4 first article packaged
receivers delivered and
presently being tested
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Prototype Receiver Specification
Parameter
Specification
Limit
Condition
RF Frequency
11.384 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
40 MHz Min.
20.0 +/- 0.56 Celsius
Noise Figure Dx and DY
3.2 dB Max.
20.0 +/- 0.56 Celsius
Noise Figure Intensity (reference)
4.0 dB Max.
20.0 +/- 0.56 Celsius
Output Power
+14 dBm
1 dB compression
Conversion Gain
28 dB typical
20.0 +/- 0.56 Celsius
Low Gain Mode Conversion Gain
0 dB typical
Extends range by 24 dB
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
X-Band Receiver Chassis
Line Replaceable Unit
(LRU) design
Local status interface
indicators for power,
operational mode, gain
range, self-test
Integral heat sink and
EMI chassis design
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Receiver Production Status
Drawings updated and
released
Specifications generated
on receiver, local
oscillation and filters
Vendor selection same
as 3-BPM first article
Presently quoting
production quantities
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Comprehensive BPM Test Program
Non-Vacuum Single BPM cold test unit complete 04/06
(Phase I) test in APS Injector Test Stand complete 09/06
(Phase II) 3-BPM test in APS LEUTL
Completed test matrix to prove compliance to specification
Production phase started
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
3-BPM Test at APS LEUTL
2-axis translation stage
installed and tested
provide sub-micron
controllable horizontal
and vertical motion
Multiple experiments
conducted to verify
operation
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Test Parameters
Beam Energy – 400 MeV
Beam Charge/pulse – 0.2 to 0.5 nC
Beam Repetition Rate – 6 Hz
Beam Pulse Width – 2 ps FWTM (uncompressed)
Diagnostics:
LEUTL current monitor
Flags upstream and downstream of test setup
Quad doublet focusing/steering upstream of test setup
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
4 mm Wide Scan Data without
removing beam motion 0.2 nC
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Single-Shot Resolution Test Procedure
Use calibration to get a list
of horizontal and vertical
positions for each BPM
Can do Model Independent
Analysis (MIA) or Least
Squares Analysis (LSA)
Predict position at middle
bpm (BPM 2) using
horizontal and vertical
positions at BPMs 1 and 3.
Histogram the residuals for
BPM 2 and standard
deviation is the resolution
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Histogram residuals for BPM 2
Courtesy Nick Sereno
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
3-BPM Test
Apparent Y resolution sY = 270 nm
Courtesy Steve Smith
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
3-BPM Test
Apparent X resolution sx = 360 nm
Courtesy Steve Smith
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
1 Hour Stability Measurement
Courtesy Nick Sereno
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Long Term Electronics Stability Testing
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
LTU and Undulator BPM System
Conformance Table
Parameter
Specification
Limit
Measured Data
(09/27/07)
Resolution
< 1m
0.2 – 1.0 nC
+/- 1 mm range
< 0.6 m
Offset Stability
< +/- 1m
1 hour
20.0 +/- 0.56 Celsius
< +/- 1m
Offset Stability
< +/- 3m
24 hours
20.0 +/- 0.56 Celsius
<100 nm electronics test
20.0 +/- 0.56 Celsius
Gain Error
< +/- 10 %
+/- 1 mm range
< 10 %
+/- 1 mm range
Dynamic Range, Position
+/- 1 mm
> +/- 1 mm
Dynamic Range, Intensity
> 14 dB
> 14 dB
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
LCLS Three-BPM Test Conclusions
Resolution spec met
Long term drift spec for 1 hour spec met
Gain stability spec met
1 hour temperature stability spec met
24 hour temperature stability spec met
electronics with simulated beam
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Undulator System Layout
IN-TUNNEL
ELECTRONICS
Low Gain
Bypass
X-Band Cavity BPM
Vertical
Reference
cavity
Attenuator/
bandpass
filter
Dipole
cavity
Ib
Horizontal
Attenuator/
bandpass
filter
Power
Limiter
Low Noise Ampl
Attenuator/
bandpass
filter
Vertical
Lowpass
Filter
Horizontal
Lowpass
Filter
Reference
Beam
Low Gain
Bypass
Power
Limiter
Low Noise Ampl
IF Amplifier
Low Gain
Bypass
Termination
Reference
Lowpass
Filter
IF Amplifier
Power
Limiter
Low Noise Ampl
40 MHz IF
signals
To
ADC
IF Amplifier
Phase Locked
Local oscillator
11.424 GHz
Local Oscillator
LO Ampl
119 MHz Beam
Synchronized
Reference
Power
Distribution
and Control
15 Volts/
control I/O
X-band receiver LRU
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Undulator System Layout
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
LTU System Layout
IN-TUNNEL
ELECTRONICS
Low Gain
Bypass
X-Band Cavity BPM
Vertical
Reference
cavity
Attenuator/
bandpass
filter
Dipole
cavity
Ib
Horizontal
Attenuator/
bandpass
filter
Power
Limiter
Low Noise Ampl
Attenuator/
bandpass
filter
Vertical
Lowpass
Filter
Horizontal
Lowpass
Filter
Reference
Low Gain
Bypass
Power
Limiter
Low Noise Ampl
IF Amplifier
Low Gain
Bypass
Termination
Reference
Lowpass
Filter
IF Amplifier
Power
Limiter
Low Noise Ampl
40 MHz IF
signals
To
ADC
IF Amplifier
Phase Locked
Local oscillator
11.424 GHz
Local Oscillator
LO Ampl
119 MHz Beam
Synchronized
Reference
October 30, 2007
FAC meeting Cavity BPM
Power
Distribution
and Control
15 Volts/
control I/O
Bob Lill
[email protected]
Deliverables per BPM
1 Cavity BPM assembly
1 X-band receiver
3 Waveguides and 2 loads
with assembly hardware
1 Receiver mounting
hardware assembly
1 BPM mounting stage
Bellows and finger inserts
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Production Milestones
Production of 2 BPMs for LTU 01/08
Production of 6 BPMs for undulator 02/08
Production of 10 BPMs for undulator 03/08
Production of 11 BPMs for undulator 04/08
Production of 7 BPMs for undulator 05/08
Spares 4 BPMs 05/08
40 sets of Electronics 07/08
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Summary
X-Band Cavity BPM
Development phase complete
Production procurement in place
First machined production units expected in November
Receiver Electronics
4 First article prototypes assembled and tested with good results
3-BPM testing prototypes incorporate receiver, local oscillator and
filter first article packaging
Production procurement ongoing
Test Qualification
Successful collaborative effort testing and qualifying BPM system
Qualified system with the same ADC (PAD) as SLAC LINAC BPM
upgrade to minimize risk of integration
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]
Production Risks
New End Cap design
New tuning scheme
Window plating problem
Unexpected integration problem
Unexpected vendor problem
October 30, 2007
FAC meeting Cavity BPM
Bob Lill
[email protected]