Argonne National Laboratory is managed by The University of Chicago for the U.S. Department of Energy

Design ReviewSR BPM Upgrade

Tony Pietryla

December 2, 2005

2

Prototype System Block Diagram

Receiver Interface– Buffer Position and Intensity signals– Receive control signals for receiver

Two 14-bit ADCs Stratix II FPGA

Watkins-Johnson Receiver

Filter Comparator

TOTI

BO

BI

DxDyS

Stratix FPGA

14bit ADC

14bit ADC

D/S

Coldfire Embedded

IOC

EPICS Readbacks

Fiber Transmitter

SFeedback

Prototype Monopulse BPM Data Acquisition

P0

44MHz

D/S and S are Differential

Signals

Receiver Interface

Control Signals

New components are shown in blue

3

Prototype Data Acquisition Chassis

Coldfire IOC

Stratix II FPGA

2 Channel

ADC

4

Prototype Receiver Interface

Backplane

Receiver Interface

Receiver Housing/Heatsin

k

Receiver

5

Lab Test Setup

Tests performed with:

1. CW signal from generator, Dx & Dy terminated on receiver, or

2. 100Hz tone applied to ADC inputs

Power Divider

Watkins-Johnson Receiver

Filter Comparator

TOTI

BOBI

DxDyS

14bit ADC

14bit ADC

D/S

Coldfire Embedded

IOC

EPICS Readbacks

Fiber Transmitter

SFeedback

Prototype Monopulse BPM Data Acquisition

Signal Generator

Stratix FPGA

P0

44MHz

D/S and S are Differential

Signals

Receiver Interface

Control Signals

New components are shown in blue

6

SRS DS360 Function Generator

100Hz Input directly into the ADC

Lab Measurement – Calibration Data

Scope Measurement: 2.82mV

Measured Output: 2.96mV

Scope Measurement: 14.35mV

Measured Output: 14.74mV

7

Lab Noise Measurement – RMS Motion 1Hz – 1kHz

CW input using filter comparator and WJ receiver

Both delta inputs on receiver were terminated

60Hz signal approximately 85nm rms.

8

Lab Noise Measurement – RMS Motion 200kHz – 44MHz

CW input using filter comparator and WJ receiver

Both delta inputs on receiver were terminated

9

Lab Measurement – Long Term Drift

CW input using filter comparator and WJ receiver

Both delta inputs on receiver were terminated

Result: 0.91m pk-pk per 0.2 °C

4.10 m pk-pk

0.9 °C pk-pk

10

Sector 38 (A:P3) Test Setup

The four button signals are combined then split to eliminate beam motion prior to the filter comparator

Power Divider

Watkins-Johnson Receiver

Filter Comparator

TOTIBOBI

DxDyS

Stratix FPGA

14bit ADC

14bit ADC

D/S

Coldfire Embedded

IOC

EPICS Readbacks

Fiber Transmitter

SFeedback

Prototype Monopulse BPM Data Acquisition

Power Divider

P0

44MHz

D/S and S are Differential

Signals

Receiver Interface

Control Signals

New components are shown in blue

11

Beam Based Calibration

All resolution numbers and graphs were converted to m using a calculated value of 14.28 m/mV

Experiments were performed to determine the calibration of the prototype unit by changing a corrector and measuring the response

Measured response of S35A:P3, S37A:P3 and prototype connected to S38A:P3 buttons

Took average of S35A:P3 and S37A:P3 responses and applied to S38A:P3

14-bit ADC resolution = 122.07V/count

Result:

– Horizontal = 15.3 m/mV

– Vertical = 17.5 m/mV

12

Single Bunch Fill Pattern – 1Hz to 1kHz

5mA stored beam

Back-to-back splitters

5 samples per bunch

13

24 Bunch Fill Pattern – 1Hz to 1kHz

102mA stored beam

Back-to-back splitters

4 samples per bunch

14

324 Bunch Fill Pattern – 1Hz to 1kHz

102mA stored beam

Back-to-back splitters

All samples used

15

Long Term Drift – 24 Bunch Fill Pattern

Back-to-back splitters

4 samples per bunch

Result: 0.93m pk-pk per 0.2 °C

4.65m pk-pk

1 °C pk-pk

16

Tcl/Tk Application for Manipulating Control Bits

4 sample

s

Data portion of waveform

Data portion of waveform

17

Original BPM Specification

Parameter

Original

Specification

New

Specification Goal Condition

First Turn, Single Bunch

Resolution / Accuracy

< 200μm / 500μm rms < 100μm / 250μm rms Single Shot

Stored Beam, Single Bunch

Resolution / Accuracy

< 25μm / 200μm rms < 1μm / 50μm rms 0.1 Hz BW

Stored Beam1

Resolution / Accuracy

< 25μm / 200μm rms < 250nm / 50μm rms 0.1 Hz BW

Dynamic Range, Position ± 20 mm Minimum ± 10 mm Minimum Standard Chamber

Dynamic Range, Intensity

Single Bunch 0.1-10 ma

40dB 40dB 200 μm deviation

Long Term Stability3 ± 30μm rms ± 1μm rms 24 Hour ± 0.2 °C

1 24 Bunch or greater

2 Stored Beam, Single or Multiple Bunches

3 24 hours, ± 0.2 Celsius

18

BPM Upgrade Specification and Compliance Table

Parameter Specification Goal Condition Compliance

First Turn, Single Bunch

Resolution / Accuracy

< 100μm / 250μm rms Single Shot 127nm rms

Stored Beam, Single Bunch

Resolution / Accuracy

< 1μm / 50μm rms 0.1 Hz BW 20nm rms

Stored Beam1

Resolution / Accuracy

< 250nm / 50μm rms 0.1 Hz BW 10nm rms

Real Time Feedback1

Resolution

< 500nm rms

< 2μm rms

1-30 Hz BW

1-200 Hz BW

1-1000 Hz BW

30nm rms

70nm rms

100nm rms

Bunch-Bunch Oscilloscope mode2

Resolution / Accuracy

< 15μm rms / 50μm rms 10 MHz BW 9.2μm rms

Dynamic Range, Position ± 10 mm Minimum Standard Chamber TBD

Dynamic Range, Intensity

Single Bunch 0.1-10 ma

40dB 200 μm deviation TBD

Long Term Stability3 ± 1μm rms 24 Hour ± 0.2 °C 0.93μm pk-pk per 0.2 °C

1 24 Bunch or greater

2 Stored Beam, Single or Multiple Bunches

3 24 hours, ± 0.2 Celsius