1. R. Ball September 27 th 2012

2.  Criteria Re-use existing readout systems where possible High density Build inexpensive adapters to existing systems Save funds for detector work  Multi-channel candidate is from the ATLAS MDT High density Proven usage in ATLAS detector at CERN Data acquisition to computer files readily available Existing analysis programs Overview 9/27/2012 2

3.  Mezzanine cards 24 input channels each Amplifier/Shaper/Discriminator for signals from detector TDC (AMT-3) to digitize signal timing and amplitude LVDS signaling for output data transmission  Chamber Service Module (CSM-4) Attaches to as many as 18 Mezzanine cards Serial to Parallel conversion of input LVDS signals. Suppression of empty data cycles Time-division multiplexing of 16-bit output data via fiber  Data Acquisition Computers Windows PC for direct control of hardware Linux WS for assembly of fiber data into disk files  Statistics accumulated for data integrity assurance Components 9/27/2012 3

4. Readout Electronics on an ATLAS MDT Chamber 9/27/2012 4

5.  Least time count is 0.78ns  80MHz internal and serial output clock to CSM  50MHz 16-bit data stream from CSM to computers  1kHz sustained trigger rate to computer  Input signal amplitude ~150mV Relevant Mezzanine/CSM Data 9/27/2012 5

6.  Mezzanine cards are designed to plug into ATLAS “Hedgehog” cards.  The HH cards, in turn, plug into the chamber ends  The PPS test detectors come in several varieties “Standard” panels with 0.1” pitch card edges Our own detectors with TBD connections Two connectors chosen, depending on the situation  Standardized on Tyco, 40-pin connectors, 1658012-1  And on Samtec TFML-120-02-S-D  Ultimately adapted to same Tyco connector  Build PPS Hedgehog card Adapt Tyco connector to Mezzanine connectors Provide resistive attenuation network to match signal size Required Adapter PCBs 9/27/2012 6

7. PPS Hedgehog Card 9/27/2012 7

8.  All panels must provide appropriately sized signals to the Mezzanine cards  Pickoff cards (eg, Pikov-4) for work in air Provide resistive attenuation network Provide the Tyco connectors  Prototype panels High density cabling connected via Samtec connector Intermediate adapter cards from Samtec to Tyco Designed to work in vacuum if necessary More Adapter PCBs 9/27/2012 8

9. Pikov-4 and Pikov-3 Cards 9/27/2012 9

10.  HEP Experiment quality electronics have been assembled for PPS development work  Minimal expenditures to adapt the hardware for our use.  Highly flexible adapter cards allow examination of a wide variety of situations and resultant signal sizes without adverse impact on the data quality. Summary 9/27/2012 10