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The 96 Channel FED Tester

AOH 0. AOH 1. AOH 2. AOH 3. AOH 4. AOH 5. AOH 6. AOH 7. The 96 Channel FED Tester. 9U VME card. EXT. Switch (16 x 16) In 0-> Out 0 In 1-> Out 1, 2 etc. FPGA. DAC. Fibre Connectors. DAC. Switch (16 x 16) In 0-> Out 6, 9 In 1-> Out 5 etc. DAC. Switch Control.

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The 96 Channel FED Tester

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  1. AOH 0 AOH 1 AOH 2 AOH 3 AOH 4 AOH 5 AOH 6 AOH 7 The 96 Channel FED Tester 9U VME card EXT Switch (16 x 16) In 0-> Out 0 In 1-> Out 1, 2 etc..... FPGA DAC Fibre Connectors DAC Switch (16 x 16) In 0-> Out 6, 9 In 1-> Out 5 etc..... DAC Switch Control AOH I2C Control Temp I2C Control Clk & Trigger FED Meeting @ IC: Greg Iles

  2. Status • Schematics finished (almost) and design in layout. • Forced into a 2 FPGA solution by lack of I/O • Some minor additions to the schematics needed (e.g import power supply designed by Osman Zorba). • AOH (Optical Hybrid) temperature control system tested • Stable to +/- 0.1 °C. • Can absorb +/- 3 °C changes in lab temperature. • VHDL written to perform PID algorithm in FPGA (untested) • Some potentially long lead time components purchased. FED Meeting @ IC: Greg Iles

  3. Artwork Fibre reels Analogue Optical Hybrid (AOH) 8-way MU connectors DACs Clk & Control (e.g. L1A) Cross-point switches FED Meeting @ IC: Greg Iles

  4. Why temperature control system Laser output drifts by 1 MIP/°C FED input range = 13 MIPs. APV requires 8+1 MIPs. Hence temperature fluctuations < +/- 2°C. Ideally < +/- 1°C. Temperature Control System Combined DAC/ADC controlled via I2C Temp sensor Brass & perspex provide support and control heat flow Fibre cables AOH Heating resistor FED Meeting @ IC: Greg Iles

  5. Temperature Control Performance Temperature stable to 0.2°C (peak to peak) System can at present only respond to +/- 3°C changes Masking tape securing system fails Results from James Leaver FED Meeting @ IC: Greg Iles

  6. MU-MU fibre connectors only rated to 500 connections. Signal slowly attenuated Both sides of connector damaged re-splice AOHs purchase new cables Alternative is to add extra cables & connections between FED and FED tester, which can be replaced when they degrade. Cabling nightmare ? Outstanding Issues FED Tester FED FED Tester FED FED Meeting @ IC: Greg Iles

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