LCLS Cavity BPM Status and Testing

Bob Lill

FAC meeting Cavity BPM [email protected]

October 30, 2007

LCLS Cavity BPM Status and Testing

Bob Lill


October 30, 2007

In-Tunnel Electronics Block Diagram

X-Band Cavity BPM

Horizontal

Attenuator/bandpass

filterLow Noise Ampl

Power Limiter

Lowpass Filter

IF Amplifier

Low Noise Ampl

Power Limiter

Low Noise Ampl

Power Limiter

LO Ampl

119 MHz Beam Synchronized

Reference

IN-TUNNEL ELECTRONICS

Ib

Reference cavity

Dipole cavity

40 MHz IF signals

To ADC

Attenuator/bandpass

filter

Attenuator/bandpass

filter

Termination

Vertical

Reference

Phase Locked Local oscillator

15 Volts/control I/O

11.424 GHz Local Oscillator

Power Distribution and Control

Vertical

Horizontal

Reference

Low Gain Bypass

Low Gain Bypass

Low Gain Bypass

Lowpass Filter

IF Amplifier

Lowpass Filter

IF Amplifier

Bob Lill


October 30, 2007

Cavity BPM Development

R&D phase completed

Testing phase II completed

Entering production phase Cold Test

1st GenerationITS Test

2nd Generation

3-BPM TestFirst Article

Bob Lill


October 30, 2007

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

Bob Lill


October 30, 2007

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

Port 2

Port 3

X-Port

Y-Port

Vertical dipole mode

Monopole mode

Bob Lill


October 30, 2007

Prototype BPMs for 3-BPM test

4 BPMs built and tested to support 3-BPM testing

Design and technology mature

Bob Lill


October 30, 2007

Cold Test After Brazing and Tuning

Serial # Dipole Freq. (GHz)

DipoleLoaded Q

MonopoleFreq. (GHz)

MonopoleLoaded 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

Bob Lill


October 30, 2007

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

Bob Lill


October 30, 2007

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

Bob Lill


October 30, 2007

Receiver Electronics Development

R&D phase complete

Test fixtures developed

Entering production phase

Bob Lill


October 30, 2007

Receiver Development

X-Band down-converter developed from existing Miteq product Modified to meet LCLS requirements3 channel receiver with common LO4 first article packaged receivers delivered and presently being tested

Bob Lill


October 30, 2007

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

Bob Lill


October 30, 2007

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

Bob Lill


October 30, 2007

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

Bob Lill


October 30, 2007

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 specificationProduction phase started

Bob Lill


October 30, 2007

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

Bob Lill


October 30, 2007

Test Parameters

Beam Energy – 400 MeVBeam Charge/pulse – 0.2 to 0.5 nCBeam Repetition Rate – 6 HzBeam Pulse Width – 2 ps FWTM (uncompressed)Diagnostics:

LEUTL current monitorFlags upstream and downstream of test setup

Quad doublet focusing/steering upstream of test setup

Bob Lill


October 30, 2007

4 mm Wide Scan Data without removing beam motion 0.2 nC

Bob Lill


October 30, 2007

Single-Shot Resolution Test Procedure

Use calibration to get a list of horizontal and vertical positions for each BPMCan 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

Bob Lill


October 30, 2007

Histogram residuals for BPM 2

Courtesy Nick Sereno

Bob Lill


October 30, 2007

3-BPM Test Apparent Y resolution Y = 270 nm

Courtesy Steve Smith

Bob Lill


October 30, 2007

3-BPM Test Apparent X resolution x = 360 nm

Courtesy Steve Smith

Bob Lill


October 30, 2007

1 Hour Stability Measurement

Courtesy Nick Sereno

Bob Lill


October 30, 2007

Long Term Electronics Stability Testing

Bob Lill


October 30, 2007

LTU and Undulator BPM System Conformance Table

Parameter Specification Limit

Measured Data (09/27/07)

Resolution < 1m

0.2 – 1.0 nC

+/- 1 mm range

< 0.6 m

Offset Stability < +/- 1m

1 hour

20.0 +/- 0.56 Celsius

< +/- 1m

Offset Stability < +/- 3m

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

Bob Lill


October 30, 2007

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

Bob Lill


October 30, 2007

Undulator System Layout

X-band receiver LRU

Beam X-Band Cavity BPM

Horizontal

Attenuator/bandpass


Power Limiter

Lowpass Filter

IF Amplifier

Low Noise Ampl

Power Limiter

Low Noise Ampl

Power Limiter

LO Ampl


Reference


Ib

Reference cavity

Dipole cavity

40 MHz IF signals

To ADC

Attenuator/bandpass

filter

Attenuator/bandpass

filter

Termination

Vertical

Reference





Vertical

Horizontal

Reference

Low Gain Bypass

Low Gain Bypass

Low Gain Bypass

Lowpass Filter

IF Amplifier

Lowpass Filter

IF Amplifier

Bob Lill


October 30, 2007

Undulator System Layout

Bob Lill


October 30, 2007

LTU System Layout

X-Band Cavity BPM

Horizontal

Attenuator/bandpass


Power Limiter

Lowpass Filter

IF Amplifier

Low Noise Ampl

Power Limiter

Low Noise Ampl

Power Limiter

LO Ampl


Reference


Ib

Reference cavity

Dipole cavity

40 MHz IF signals

To ADC

Attenuator/bandpass

filter

Attenuator/bandpass

filter

Termination

Vertical

Reference





Vertical

Horizontal

Reference

Low Gain Bypass

Low Gain Bypass

Low Gain Bypass

Lowpass Filter

IF Amplifier

Lowpass Filter

IF Amplifier

Bob Lill


October 30, 2007

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

Bob Lill


October 30, 2007

Production Milestones

Production of 2 BPMs for LTU 01/08

Production of 6 BPMs for undulator 02/08




Spares 4 BPMs 05/08

40 sets of Electronics 07/08

Bob Lill


October 30, 2007

Summary

X-Band Cavity BPMDevelopment phase complete Production procurement in placeFirst machined production units expected in November

Receiver Electronics4 First article prototypes assembled and tested with good results3-BPM testing prototypes incorporate receiver, local oscillator and filter first article packagingProduction procurement ongoing

Test QualificationSuccessful collaborative effort testing and qualifying BPM system Qualified system with the same ADC (PAD) as SLAC LINAC BPM upgrade to minimize risk of integration

Bob Lill


October 30, 2007

Production Risks

New End Cap design

New tuning scheme

Window plating problem

Unexpected integration problem

Unexpected vendor problem

LCLS Cavity BPM Status and Testing

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