Bob Lill Undulator Systems – Cavity BPM [email protected] October 12, 2006 Undulator Cavity...

Bob Lill

Undulator Systems – Cavity BPM Status [email protected]

October 12, 2006

Undulator Cavity BPM Status

Bob Lill


October 12, 2006

Design Review Outline

BPM System Design OverviewCavity DesignElectronics and ADCCurrent status for phase I prototype testingPlanning phase II prototype testFirst article and production

Bob Lill


October 12, 2006

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


October 12, 2006

BPM System Overview Block Diagram

X-Band Cavity BPM

Horizontal

Attenuator/bandpass

filterLow Noise Ampl

Power Limiter

Lowpass Filter

Amplifier

Low Noise Ampl

Power Limiter

Lowpass Filter

Amplifier

Low Noise Ampl

Power Limiter

Lowpass Filter

Amplifier

LO Ampl

119 MHz Beam Synchronized

Reference

IN-TUNNEL ELECTRONICS

Reference cavity

Dipole cavity

To ADC

Attenuator/bandpass

filter

Attenuator/bandpass

filter

Termination

Vertical

Reference

Phase Locked Local oscillator

15 Volts/control I/O

2856 MHz Local Oscillator

Power Distribution and Control

Bob Lill


October 12, 2006

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


October 12, 2006

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

Bob Lill


October 12, 2006

Before and After Brazing (ITS Prototype)

Bob Lill


October 12, 2006

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


October 12, 2006

Baseline Design for Phase I PrototypeMiteq 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

Bob Lill


October 12, 2006

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

Bob Lill


October 12, 2006

In-Tunnel Receiver Block Diagram

Dx

Dy

SUM

Low Noise Ampl

Power Limiter

Lowpass Filter

Amplifier

Low Noise Ampl

Power Limiter

Lowpass Filter

Amplifier

Low Noise Ampl

Power Limiter

Lowpass Filter

Amplifier

LO Ampl

Beam Synchronized local oscillator

Bob Lill


October 12, 2006

Prototype X-Band Low Noise Receivers

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/1m0

50

100

1stQtr

3rdQtr

East

West

North

Power Sweep LO 8 dBm RF 11.364 GHz

-80

-70

-60

-50

-40

-30

-20

-10

0

10

20

30

-100 -80 -60 -40 -20 0

X-Band Power (dBm)

DC

Ou

tpu

t 60 M

Hz (

dB

m)

s/n 118994

27.5 dB

diff

Bob Lill


October 12, 2006

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


October 12, 2006

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


October 12, 2006

(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


October 12, 2006

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 shut-down

Ref.

Hor.

Vert.

Bob Lill


October 12, 2006

ITS Data Processing Development

ITS Scan Hor vs Vert 0.33 nC

0

50

100

150

200

250

300

350

-1500 -1000 -500 0 500 1000 1500

Posistion (microns)

Vo

ut

(mV

)

Hor

Vert

Bob Lill


October 12, 2006

Waveforms acquired with sampling scope and processed via Epics

Bob Lill


October 12, 2006

Normalized waveforms 0.05 nC charge

Bob Lill


October 12, 2006

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 1.22 mV/um/nC

Bob Lill


October 12, 2006

(Phase II) 3 BPM Test Schedule Milestones

Refine design and develop First Article Cavity BPM and support hardware

August 06

Start 3 BPMsOctober 06

First unit with accelerated delivery October 06

Install 3 cavity BPMs into APS LEUTL and TestDecember 06

Bob Lill


October 12, 2006

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

Bob Lill


October 12, 2006

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

Bob Lill


October 12, 2006

Monopole Cavity DesignBeam 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

Bob Lill


October 12, 2006

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


October 12, 2006

Design Development

Cold Test UnitITS Test Unit

First Article Design

Bob Lill


October 12, 2006

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

Bob Lill


October 12, 2006

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 down-converter

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

Bob Lill


October 12, 2006

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


October 12, 2006

Phase II Data Acquisition Design Approach

Instrument three BPMs with SLAC Built 16-bit, 130 MSPS digitizers (PAD)

Epics driver availableSynchronize ADC clock with 119 MHz

Digitize horizontal, vertical position and Intensity 0 to 1 volt range

Digital down convert 40 MHz IF decaying exponentials

Bob Lill


October 12, 2006

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


October 12, 2006

System Layout and Planning

X-band receiver LRU

Beam

Bob Lill


October 12, 2006

Production Phase

Production of 2 BPMs for LTU 04/07

Production of 6 BPMs for undulator 04/07




Spares 12/07

Bob Lill


October 12, 2006

Summary

X-Band Cavity BPM development ongoingBolt-together prototype (non-vacuum) completeITS prototype testing ongoing3 BPM test prototype design enhancements ongoing

Receiver Prototype DevelopmentFirst Prototype installed in ITS with good results3 BPM test prototype design incorporates high/low gain, self-test and final packaging

Data Acquisition and TestCollaborating with SLAC to use the same ADC as SLAC LINAC BPM upgrade

Bob Lill Undulator Systems – Cavity BPM [email protected] October 12, 2006 Undulator Cavity...

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