# Presentation: 177391

## Ring BPM ElectronicsCraig Dawson

- BNL Diagnostic Meeting

- Feb. 5-6, 2004

## Outline

- Schedule
- March 2003 Design Review
- Requirements
- Status

- BNL Diagnostic Meeting

- Feb. 5-6, 2004

## BPM Schedule

- Electronics for the RTBT & Ring on site starting April 2004
- Majority of Pickups complete

| PUE | Required units | Machined parts | Completed units  | Delivered units |
| --- | --- | --- | --- | --- |
| 21 cm ring | 28 | 100% | 33 | 32
(complete) |
| 26 cm ring | 8 | 100%
 | 10 | 9
(complete) |
| 30 cm ring | 8 | 100% | 10 | 8
(complete) |
| 12 cm 
HEBT | 31 | 100%
 | 34 | 34
(complete) |
| 21 cm 
HEBT /RTBT | 19 | 100%
 | 21 | 17 |
| 36 cm 
RTBT | 2 | 100%
 | 3 | 0 |

- BNL Diagnostic Meeting

- Feb. 5-6, 2004

## 2003 DAC Review Concerns 

- Proceed at highest priority.
- The problems with the BCM prevented this from being the highest priority but significant progress has been made.
- Too big to fit on PCI card.
-  A PCI card with the majority of the base band circuitry is currently in test. The protected amplifier is on the RF board.
- Little was presented on details of cabling, patch panels etc.
- Cabling requirements including heliax, patch panels and jumpers were established at BNL some time ago. Oak Ridge Diagnostics has decided not to use patch panels and has selected LMR195 jumpers for each end of the heliax. No bulkhead connectors will be used in the tunnel.
- The presentation on software processing of signals still offered suggestions and options, focus should be on making design decisions rather than to offer suggestions and possibilities.
- The software is being developed utilizing Wim’s LabVIEW template. The final choice of processing techniques will be made as hardware testing progresses

- BNL Diagnostic Meeting

- Feb. 5-6, 2004

## BPM Ring - RTBT Requirements

- Intensity	 5e10 to 2e14 Protons
- Range	 +/- 100 mm
- Accuracy	 1% of half aperture
- Resolution	 0.5%/1% of half aperture averaged/turn-turn
- Data Structure turn-by-turn (except during gain switching)
- dual plane PUE at each quad

- BNL Diagnostic Meeting

- Feb. 5-6, 2004

## Ring BPM Electronics Design Issues

- Particles diffuse into a single bunch after a few turns.  There is little base-band energy in the first turn.
- BPM PUE is an open stripline and has little sensitivity at base-band, higher sensitivity at RF.
- Dynamic range on the order of 60dB required.
- Calibration must deal with the dynamic range of the machine.
- A dual path approach has been applied to address these issues.

- BNL Diagnostic Meeting

- Feb. 5-6, 2004

## Ring BPM Signal Conditioning & Amplification

***Ring BPM Signal Conditioning & Amplification***

- +10dB

- +10dB

- +0dB

- ADC

- ANTI-ALIAS
- FILTER

- +0dB

- LP

- HP

- X

- IN

- MIX

- RF/BASE-BAND
-  BOARD

- BASE-BAND
-  BOARD

- Protected
- amp

- CAL

- CAL
-  enable

- BW=10MHz

- BW=10MHz

- +20 to +50 dB Gain Range

- Base-band :  -20dB to +20dB Gain Range

- LO
- 400MHz

- LO enable

- x

- BNL Diagnostic Meeting

- Feb. 5-6, 2004

## Status

- AFE electronics from the second stage amplifiers to the digitizers has been incorporated onto the PCI card.
- RF, calibration and first base band amplifier stage is located on a daughter card.
- Board testing is underway.
- The majority of parts have been procured for the base band  board.

- BNL Diagnostic Meeting

- Feb. 5-6, 2004

## Board layout

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- <date/time>

*Board layout*

- Event Link Input

- RTDL Input

- Trigger Input

- Rsvd. Output

- Altera JTAG port

- Calibrator Interface
- (not used on BPM)

- BPM Front End

- Filters

- Connector for RF Board

- Power Connector

- +5V Regulators

## No Signal, Gain set to 20dB

- BNL Diagnostic Meeting

- Feb. 5-6, 2004

## 2.5MHz, 20mV Sine input, 20dB 

- BNL Diagnostic Meeting

- Feb. 5-6, 2004

## Remaining Tasks

- Verify that the AFE meets requirements for gain, s/n,
- 	filter characteristics, channel matching, cross talk, switching etc.
- Test with simulated BPM signals and with RF board.
- Make circuit modifications if needed to optimize performance when the PCI card is modified for optical RTDL and Event Link input.
- Finalize software.
- Build / test the off board power supply.
- Assemble systems, Test, Supply Documentation as agreed with Oak Ridge staff.
- Ensure that the Oak Ridge staff is familiar with the setup and operation of the system.

- BNL Diagnostic Meeting

- Feb. 5-6, 2004

## Remaining Material Costs

- BNL Diagnostic Meeting

- Feb. 5-6, 2004