Transcript RF BPM Status and Schedule

Undulator Cavity BPM
Status
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
Design Review Outline
BPM System Design Overview
Cavity Design
Electronics and ADC
Current status for phase II testing
First article and production
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
LTU and Undulator BPM System Specification
Parameter
Specification
Limit
Condition
Resolution
< 1m
0.2 – 1.0 nC
+/- 1 mm range
Offset Stability
< +/- 1m
1 hour
+/- 1 mm range
20.0 +/- 0.56 Celsius
Offset Stability
< +/- 3m
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
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
In-Tunnel Receiver 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
April 16, 2007
Undulator Cavity BPM System Status
LO Ampl
Power
Distribution
and Control
15 Volts/
control I/O
Bob Lill
[email protected]
40 MHz IF
signals
To
ADC
Design Development
ITS Test Unit
First Article Design
Cold Test Unit
April 16, 2007
Undulator Cavity BPM System Status
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
April 16, 2007
Undulator Cavity BPM System 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
April 16, 2007
Undulator Cavity BPM System Status
Tuning
Pins
Bob Lill
[email protected]
Prototype BPMs for 3-BPM test
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
Polished and re-surfaced
All 4 bodies need
rework
Argonne surface
laboratory provided
polishing and
measurements of
critical surfaces (0.1
micron rms)
1st unit brazed Altair
Inc.
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
Preliminary Cold Test
Test fixtures designed
and built for
preliminary tuning
before brazing
Critical tuning
experience gained
Encouraging cold test
results after
rework/tuning
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
Cold Test Before Brazing (11.384 GHz Goal)
Serial #
R/01
01
Position
11.359 11.381
Cavity
Freq. GHz)
Reference 11.367 11.382
Cavity
Freq. GHz)
April 16, 2007
Undulator Cavity BPM System Status
02
03
11.377
11.381
11.385
11.407
Bob Lill
[email protected]
X-Band Receiver Development
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
X-Band Receiver Packaging Design
Receiver enclosure 12.5
wide by 15 deep by 2.5
thick (inches) with integral
heat sink
Houses input filters local
oscillator and downconverter
3-WR75 Inputs, 3-type “N”
outputs, LO ref. input Type
“N”, power and control
cable
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
X-Band Receiver Chassis
4 receivers chassis
built and tested
High/Low gain feature
(28/0dB) to extend
dynamic range
Integrated self-test
Multi-mode operation
with phase locked LO
April 16, 2007
Undulator Cavity BPM System Status
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 EMI chassis
design
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
Receiver Test Fixture Development
Test fixture developed
for bench testing
Multi-mode operation
with phase locked local
oscillator or free-run
test capabilities
Test fixture inspected
before operated
April 16, 2007
Undulator Cavity BPM System Status
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
50 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
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
Dynamic Range Testing
Power Sweep RF 11.384 GHz
119 MHz Phase Locked
28.2 dB conversion gain
DC Output 40 MHz (dBm)
40
20
0
-120
-100
-80
-60
-40
-20
0
-20
-40
-60
-80
-100
X-Band Power (dBm)
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
System Response Frequency Sweep
Frequency Response
40
20
Conversion Gain (dB)
0
-20 8
-40
9
10
11
12
13
14
15
Measured Recv.
-60
-80
-100
-120
-140
Measured
System
-160
Frequency (GHz)
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
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
April 16, 2007
Undulator Cavity BPM System 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
April 16, 2007
Undulator Cavity BPM System 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
April 16, 2007
Undulator Cavity BPM System 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
April 16, 2007
Undulator Cavity BPM System 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
April 16, 2007
Undulator Cavity BPM System Status
Hor.
Ref.
Vert.
Bob Lill
[email protected]
Waveforms acquired with sampling scope and
processed via Epics
April 16, 2007
Undulator Cavity BPM System 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
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
In-Tunnel Progress
2-axis translation stage
installed and tested
Stages provide submicron controllable
horizontal and vertical
motion
Multiple experiments
planned to verify
operation
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
LEUTL 3 BPM Test Readiness
Mid-May Testing
Scheduled
PC gun beam 325 MeV
to dump
33 Hor. and 23 Vert.
micron normalized
emittance
Compressed beam
less than 1 ps
April 16, 2007
Undulator Cavity BPM System 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
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
Stability Testing
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
PAD Dynamic Range
PAD #2
35000
ADC (counts)
30000
25000
Ch 0
20000
ch 1
15000
ch 2
10000
ch 3
5000
0
0
0.05
0.1
0.15
0.2
0.25
0.3
Voltage Input
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
System Layout and Planning
Beam
X-band receiver LRU
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
BPM SUT Hardware
Cavity BPM mounted
for SUT testing
Receiver mounting
hardware prototyped
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
Production Schedule
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
Production Phase
Production of 2 BPMs for LTU 07/07
Production of 6 BPMs for undulator 07/07
Production of 10 BPMs for undulator 09/07
Production of 11 BPMs for undulator 11/07
Production of 7 BPMs for undulator 01/08
Spares 4 BPMs 01/08
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]
Summary
X-Band Cavity BPM Development Ongoing
4 Cavity BPM machined
1st unit waiting brazed
3 other units are being brazed
3-BPM test planned for mid-May
Receiver Prototype Development
3-BPM test prototype design incorporates high/low gain, self-test
and final packaging
First 4 Prototypes assembled with good results
Data Acquisition and Test
Collaborating with SLAC to use the same ADC as SLAC LINAC
BPM upgrade
Testing is on going at this time with promising results
April 16, 2007
Undulator Cavity BPM System Status
Bob Lill
[email protected]