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TRD Pre-trigger System

TRD Pre-trigger System. Ken Oyama, Heidelberg Nov. 22, 2004 @ Lyon. Overview of the Pre-Trigger System. TRD pre-trigger (wakeup signal) is generated by pre-trigger shoebox from T0 and V0 detectors. Since timing is crucial, the special pre-trigger box (shoebox) is placed inside L3 magnet.

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TRD Pre-trigger System

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  1. TRD Pre-trigger System Ken Oyama, Heidelberg Nov. 22, 2004 @ Lyon

  2. Overview of the Pre-Trigger System • TRD pre-trigger (wakeup signal) is generated by pre-trigger shoebox from T0 and V0 detectors. • Since timing is crucial, the special pre-trigger box (shoebox) is placed inside L3 magnet. • The pre-trigger shoebox should have the functionalities: • generate pre-trigger coincidence signal of T0 detectors or V0 detectors with programmable thresholds on individual channel within. • get TTC optical signal and insert pre-trigger in it. • provide TTC optical signals to 18 TRD super-modules. • allowed latency from interaction to trigger arrival to MCM is only ~0.5 s.

  3. Major Design Change • We were planning to put TTCvi and so on inside magnet but: • We would need VME bus master for only TTCvi. • What we have to do in shoebox is to put pre-trigger into TTC stream line. • No other functionality of TTCvi is needed. • We can have TRD TTC outside magnet (same as other detectors). • TTCvi and TTCex is just too much for our purpose, and makes more latency. • And this need VME bus and VME bus master. • Another solution - without TTCvi and VME bus master. • 1. Receive optical signal from TTC outside magnet, and put it in FPGA. • 2. Put pre-trigger. • 3. Fan-out again.

  4. Arrangement As one of examples, we prepare 3 shoeboxes in A side and 4 shoeboxes in C side. Each shoebox has VME like geometry but smaller width (3 to 5 slots). There are two versions of shoeboxes (normal and DCS).

  5. Positions inner bar (7m) TRD RB24 RB26 SB+DCS SB SB SB SB SB SB T0 A T0 C

  6. Shoebox Geometries (I) Normal Shoebox for V0 d=210 mm Normal Shoebox for T0 coincidence w=170 mm d=210 mm preamp+disc. coincidence preamp+disc. h=270 mm w=110 mm preamp+disc. preamp+disc. preamp+disc. 6 ch. inputs 6 ch. H.G. outs 6 ch. L.G. outs h=270 mm preamp+disc. d : is 160 mm VME card depth + connector and backplane + case. w: is [20 mm VME card width + 10 mm margin (cooling)]  #of module + 20 mm case margin. h : is 235 mm VME card height + case margin Cabling needs additional space in the front (50 mm) and back (30 mm) of the Shoeboxes. Cooling water should be also considered.

  7. Shoebox Geometries (II) Shoebox with DCS/Opt.F.O. d=210 mm TTC F.O. 2 TTC F.O. 1 w=110 mm DCS h=270 mm TTC F.O. can be TTCex or TTCex. DCS module is a VME size board + KIP DCS on it. DCS module has also coincidence of PreTrigger-A and -C.

  8. Differential Differential Differential Differential Differential Differential disc disc disc disc disc disc Preamp+Discriminator Board Input Low Gain Out Conn. High Gain Out Pre-amp part design is almos fixed by T0 and V0 people. Is it possible to have input and outputs at the same side? disc. is 500 ps delay PECL discriminator outs are going coincidence logic module. (It can directly drive FPGA CMOS input). Can pre-amps be on the same PCB? Can power regulators be common? control 8 ch. DAC

  9. Coincidence Logic Board disc. out Conn. to PD DAC control CLK FPGA -delay -control -threshold HitPattern SCSN/JTAG TRIG in x4 only for side merger CLK out x 4 CLK from Main CTRL only for side merger PreTrig-A or -C

  10. Main Control Board DCS -delay -control -threshold TTC optical input Pre-Trigger to CTP Ethernet TTC ECL out to F.O. module SCSN/JTAG for side A SCSN/JTAG for side C CLK to side A merger PreTrig-A CLK to side C merger PreTrig-C

  11. Status • Conceptual design is almost fixed. • T0 group fixed pre-amp design. • Heidelberg started to design 6ch. pre-amp module. • Final version of DCS is ready to use.

  12. Questions to be Solved • Radiation tests: Nothing was tested except for DCS (includes TTCrx and Altera FPGA). • Fault tolerance: - System may have malfunctioning due to radiation, B field, and normal problems. - We can consider to have at least two DCS Shoeboxes and Optical stuff. Two optical fibers should go to each TRD super-module and merged inside, or shall we put optical driver inside TRD super-module? • Inductance free design? - T0 pre-amp design has L. Also all shoeboxes should not have any L with ferrite core. • How to supply power? (+ 5V and - 5V) - T0 or V0 rack has ground connection to shoebox via signal cable. • About Preamp design for T0 - Fixed version? - Any other online adjustment needed? (T0 pre-amp prototype has 3 variable R's). We have 2 ch. unused DAC channels, for example. - Power regulator can be common?

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