DAQ 1000 Tonko Ljubicic, Mike LeVine, Bob Scheetz, John Hammond, Danny Padrazo, Fred Bieser, Jeff Landgraf

Current TPC Electronics Basics 5184 FEEs – Front End Electronics 5184 FEEs – Front End Electronics Analog shaping, tail suppression, ADC. No event buffering. Analog shaping, tail suppression, ADC. No event buffering. 144 RDOs – Readout Boards 144 RDOs – Readout Boards Located on TPC, multiplexes 36 FEE’s to a single fiber. Located on TPC, multiplexes 36 FEE’s to a single fiber. 144 Receiver Boards 144 Receiver Boards Located in VME crates in the DAQ room. Located in VME crates in the DAQ room. Pedestal subtraction, zero suppression, gain corrections, T0 corrections, 2-d cluster finding. Pedestal subtraction, zero suppression, gain corrections, T0 corrections, 2-d cluster finding. Sector Brokers / Event Builders / RCF network Sector Brokers / Event Builders / RCF network Full 10 bit, 512 time-bin, channel data is transferred to the receiver boards for every event.  100 Hz maximum rate 10ms dead time for each event (1% dead / hz taken) 10ms dead time for each event (1% dead / hz taken)

Summary DAQ 1000 is a project to replace the TPC FEE’s, RDO’s, and DAQ with a system capable of 1000hz (Au-Au, central) DAQ 1000 is a project to replace the TPC FEE’s, RDO’s, and DAQ with a system capable of 1000hz (Au-Au, central) Based on ALICE’s Altro/Pasa chips, as well as their DDL links. Based on ALICE’s Altro/Pasa chips, as well as their DDL links.

ALTRO / PASA Chip Order After long delays the chip purchase contract is in place. After long delays the chip purchase contract is in place. Expect delivery by beginning of February Expect delivery by beginning of February We have 120 Altro/Pasa pairs at BNL as an advance from the big order. 72 are required to outfit the entire 36 FEEs needed for a single RDO. We have 120 Altro/Pasa pairs at BNL as an advance from the big order. 72 are required to outfit the entire 36 FEEs needed for a single RDO.

FEE ALTRO/PASA pairs perform pulse shaping, ADC, zero suppression, pedestal subtraction, gain corrections, and tail subtraction on the FEE, before transferring data to DAQ. ALTRO/PASA pairs perform pulse shaping, ADC, zero suppression, pedestal subtraction, gain corrections, and tail subtraction on the FEE, before transferring data to DAQ.  Huge data rate increase even though link speed is comparable  Multi-Event Buffering on ALTRO  Zero dead time as long as throughput remains less than max rate. This allows us to increase the min-bias rate modestly (x 2-5) while rare triggers sample full luminosity. ALTRO/PASA pairs perform pulse shaping, ADC, zero suppression, pedestal subtraction, gain corrections, and tail subtraction on the FEE, before transferring data to DAQ. ALTRO/PASA pairs perform pulse shaping, ADC, zero suppression, pedestal subtraction, gain corrections, and tail subtraction on the FEE, before transferring data to DAQ.  Huge data rate increase even though link speed is comparable  Multi-Event Buffering on ALTRO  Zero dead time as long as throughput remains less than max rate. This allows us to increase the min-bias rate modestly (x 2-5) while rare triggers sample full luminosity.

FEE Prototypes Total of 4 prototype versions so far. Total of 4 prototype versions so far. Noise problems in the first prototype fixed. Noise problems in the first prototype fixed. Currently preparing to fabricate 50 production boards for use in the 2007 run. Currently preparing to fabricate 50 production boards for use in the 2007 run.

4 FEE’s installed in TPC during 2005 Pedestal / Laser / Real Data Hits Demonstrated that we understand the operating modes of the ALTRO chip Pedestal subtractionPedestal subtraction Exponential Tail SubtractionExponential Tail Subtraction

RDO First prototype was a daughter card to be used with a Microtronics FPGA development board. First prototype was a daughter card to be used with a Microtronics FPGA development board. Second prototype now fabricated: full sized for insertion in TPC Second prototype now fabricated: full sized for insertion in TPC

Non-TPC upgrades A PCI network card to receive the standard STAR GLINK fiber protocol is being developed. A PCI network card to receive the standard STAR GLINK fiber protocol is being developed. The card makes use of the fact that the commercial DDL interconnect we are using incorporates the fiber interface in a separate daughter card, so only the daughter card needs to be adapted. The card makes use of the fact that the commercial DDL interconnect we are using incorporates the fiber interface in a separate daughter card, so only the daughter card needs to be adapted. The card makes it possible move existing detectors from custom VME boards to cheap/fast PC’s. The card makes it possible move existing detectors from custom VME boards to cheap/fast PC’s. BTOW, ETOW, BSMD, ESMD, SSD, TOF are good candidates. BTOW, ETOW, BSMD, ESMD, SSD, TOF are good candidates.

Other hardware RDO power supplies RDO power supplies Current supplies are +/- 8V Current supplies are +/- 8V RDO needs only 5V RDO needs only 5V It would be possible to reduce the heat load by replacing the power supplies for a cost of $70k. It would be possible to reduce the heat load by replacing the power supplies for a cost of $70k. Configuration / Slow controls Configuration / Slow controls DDL link is bi-directional, so configuration of FEE’s/RDO’s is performed through DAQ interface. DDL link is bi-directional, so configuration of FEE’s/RDO’s is performed through DAQ interface. Slow controls will still operate power supply switches. Slow controls will still operate power supply switches.

Event Building Plan to move to Gb ethernet network rather than myrinet. Plan to move to Gb ethernet network rather than myrinet. PC’s rather than VME custom receiver boards for lower cost / higher reliability / better performance / easier repair. PC’s rather than VME custom receiver boards for lower cost / higher reliability / better performance / easier repair. One sector per PC is the likely scenario (6 PCI cards). One sector per PC is the likely scenario (6 PCI cards). Push architecture which will have some repercussions on data format. (I will provide readers which should make this transparent to the offline code) Push architecture which will have some repercussions on data format. (I will provide readers which should make this transparent to the offline code)

Schedule 2007 Run – 1 RDO with full complement of 36 FEE’s installed by late November 2006 with existing manpower shutdown through end of 2008 Run – Exact schedule depends on 2007 run experience. 2 EEs, 4 techs 2 EEs, 4 techs PCB fab, assembly, inspection, 1 st level testing, and final testing and acceptance for boards Shutdown – 2 EEs, 4 techs Removal of existing TPC electronics, installation of new FEEs, RDOs, cabling, & modifications of power supplies 2009 Run – First full physics run with DAQ1000

Differences From Existing Electronics Digital tail suppression  we control parameters Digital tail suppression  we control parameters More simplistic zero suppression algorithm (Altro hit is adc>th for n time-bins, STAR ASIC has 2 sets of threshold/duration pairs) More simplistic zero suppression algorithm (Altro hit is adc>th for n time-bins, STAR ASIC has 2 sets of threshold/duration pairs) Out of hit data available (even if negative values after pedestal subtraction) Out of hit data available (even if negative values after pedestal subtraction) More complicated options for pedestal subtraction More complicated options for pedestal subtraction Moving average out-of-event baseline correction. Moving average out-of-event baseline correction. Moving average in-event pedestal correction Moving average in-event pedestal correction Digitization on Altro is constant into a circular buffer, so can potentially read out data previous to the gated grid opening &/or without the gated grid opening. (however still need a trigger) Digitization on Altro is constant into a circular buffer, so can potentially read out data previous to the gated grid opening &/or without the gated grid opening. (however still need a trigger)

Summary DAQ 1000 on schedule for full roll out in 2009 DAQ 1000 on schedule for full roll out in full RDO planned for full RDO planned for 2007