Bob Lill Undulator Cavity BPM System [email protected] April 16, 2007 Undulator Cavity BPM Status

Bob Lill

Undulator Cavity BPM System Status [email protected]

April 16, 2007

Undulator Cavity BPM Status

Bob Lill


April 16, 2007

Design Review Outline

BPM System Design Overview

Cavity Design

Electronics and ADC

Current status for phase II testing

First article and production

Bob Lill


April 16, 2007

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


April 16, 2007

In-Tunnel Receiver 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


April 16, 2007

Design Development

Cold Test UnitITS Test Unit

First Article Design

Bob Lill


April 16, 2007

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

Bob Lill


April 16, 2007

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

Tuning Pins

Bob Lill


April 16, 2007

Prototype BPMs for 3-BPM test

Bob Lill


April 16, 2007

Polished and re-surfaced

All 4 bodies need reworkArgonne surface laboratory provided polishing and measurements of critical surfaces (0.1 micron rms)1st unit brazed Altair Inc.

Bob Lill


April 16, 2007

Preliminary Cold Test

Test fixtures designed and built for preliminary tuning before brazing

Critical tuning experience gained

Encouraging cold test results after rework/tuning

Bob Lill


April 16, 2007

Cold Test Before Brazing (11.384 GHz Goal)

Serial # R/01 01 02 03

Position Cavity Freq. GHz)

11.359 11.381 11.377 11.381

Reference Cavity Freq. GHz)

11.367 11.382 11.385 11.407

Bob Lill


April 16, 2007

X-Band Receiver Development

Bob Lill


April 16, 2007

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 down-converter

3-WR75 Inputs, 3-type “N” outputs, LO ref. input Type “N”, power and control cable

Bob Lill


April 16, 2007

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

Bob Lill


April 16, 2007

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

Bob Lill


April 16, 2007

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

Bob Lill


April 16, 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 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

Bob Lill


April 16, 2007

Dynamic Range Testing

Power Sweep RF 11.384 GHz 119 MHz Phase Locked28.2 dB conversion gain

-100

-80

-60

-40

-20

0

20

40

-120 -100 -80 -60 -40 -20 0

X-Band Power (dBm)

DC

Ou

tpu

t 40

MH

z (d

Bm

)

Bob Lill


April 16, 2007

System Response Frequency Sweep

Frequency Response

-160

-140

-120

-100

-80

-60

-40

-20

0

20

40

8 9 10 11 12 13 14 15

Frequency (GHz)

Co

nve

rsio

n G

ain

(d

B)

Measured System

Measured Recv.

Bob Lill


April 16, 2007

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 two-axis translation stage

Phase II

LEUTL test with PC gunInstall three X-Band Cavities BPMs

Mount all 3 BPMs together on a two-axis translation stage

Bob Lill


April 16, 2007

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


April 16, 2007

(Phase I) ITS BPM Test Results

BPM setup on X/Y translation stageAligned 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 magnetsto reduce to 200 um rmsBeam stability limited to 50 m rms. Laser improvements ongoing

Bob Lill


April 16, 2007

Prototype Cold Test (Dipole cavity 500 micron offset)

Parameter(500 µm offset)

Predicted Measured Prototype # 1 bolted end caps

Measured Prototype # 2

brazed end caps

Frequency TM010 8.262 GHz 8.271 GHz 8.243 GHz

Coupling TM010 -53 dB -69 dB -62 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



Bob Lill


April 16, 2007

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

Ref.

Hor.

Vert.

Bob Lill


April 16, 2007

Waveforms acquired with sampling scope and processed via Epics

Bob Lill


April 16, 2007

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

Bob Lill


April 16, 2007

In-Tunnel Progress

2-axis translation stage installed and tested

Stages provide sub- micron controllable horizontal and vertical motion

Multiple experiments planned to verify operation

Bob Lill


April 16, 2007

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

Bob Lill


April 16, 2007

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

Bob Lill


April 16, 2007

Stability Testing

Bob Lill


April 16, 2007

PAD Dynamic Range

PAD #2

0

5000

10000

15000

20000

25000

30000

35000

0 0.05 0.1 0.15 0.2 0.25 0.3

Voltage Input

AD

C (

cou

nts

)

Ch 0

ch 1

ch 2

ch 3

Bob Lill


April 16, 2007

System Layout and Planning

X-band receiver LRU

Beam

Bob Lill


April 16, 2007

BPM SUT Hardware

Cavity BPM mounted for SUT testing

Receiver mounting hardware prototyped

Bob Lill


April 16, 2007

Production Schedule

Bob Lill


April 16, 2007

Production Phase

Production of 2 BPMs for LTU 07/07

Production of 6 BPMs for undulator 07/07




Spares 4 BPMs 01/08

Bob Lill


April 16, 2007

Summary

X-Band Cavity BPM Development Ongoing4 Cavity BPM machined1st unit waiting brazed3 other units are being brazed3-BPM test planned for mid-May

Receiver Prototype Development3-BPM test prototype design incorporates high/low gain, self-test and final packagingFirst 4 Prototypes assembled with good results

Data Acquisition and TestCollaborating with SLAC to use the same ADC as SLAC LINAC BPM upgradeTesting is on going at this time with promising results

Documents

Bob Lill Undulator Cavity BPM System [email protected] April 16, 2007 Undulator Cavity BPM Status