Ring BPM Electronics Craig Dawson

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Ring BPM ElectronicsCraig Dawson
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Outline

• Schedule
• March 2003 Design Review
• Requirements
• Status

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BPM Schedule

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

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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 Wims
  LabVIEW template. The final choice of processing
  techniques will be made as hardware testing
  progresses

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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

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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.

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Ring BPM Signal Conditioning Amplification
RF/BASE-BAND BOARD
BASE-BAND BOARD
LP
IN
10dB
0dB
HP
x
0dB
Protected amp
BW10MHz
BW10MHz
CAL
10dB
ANTI-ALIAS FILTER
MIX
CAL enable
X
ADC
LO 400MHz
LO enable
20 to 50 dB Gain Range
Base-band -20dB to 20dB Gain Range
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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.

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Board layout
Calibrator Interface (not used on BPM)
5V Regulators
Filters
BPM Front End
Event Link Input
RTDL Input
Trigger Input
Rsvd. Output
Altera JTAG port
Power Connector
Connector for RF Board
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No Signal, Gain set to 20dB
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2.5MHz, 20mV Sine input, 20dB
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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.

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Remaining Material Costs