Download - Design Review SR BPM Upgrade

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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


Filter Comparator

TOTI

BOBI

DxDyS

14bit ADC

14bit ADC

D/S

Coldfire Embedded

IOC

EPICS Readbacks

Fiber Transmitter

SFeedback


Signal Generator

Stratix FPGA

P0

44MHz


Signals

Receiver Interface

Control Signals


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



9

Lab Measurement – Long Term Drift



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


Filter Comparator

TOTIBOBI

DxDyS

Stratix FPGA

14bit ADC

14bit ADC

D/S

Coldfire Embedded

IOC

EPICS Readbacks

Fiber Transmitter

SFeedback


Power Divider

P0

44MHz


Signals

Receiver Interface

Control Signals


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


4 samples per bunch

14

324 Bunch Fill Pattern – 1Hz to 1kHz

102mA stored beam


All samples used

15

Long Term Drift – 24 Bunch Fill Pattern


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


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

Stored Beam1


< 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


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

Stored Beam, Single Bunch


< 1μm / 50μm rms 0.1 Hz BW 20nm rms

Stored Beam1


< 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


< 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