List of T962 DAQ Components --------------------------------- Original Rev. 1-JUNE-2007 Current Rev. 4-JUNE-2007 The following is a list that I made of the components for the DAQ system for T962. I tried to make a short comment about each component to give folks some idea of what I was talking about. - The components in this list are for a system with the Bias Voltage distribution inside the cryostat. - I have assumed 480 channels. This will require 30 PreAmp Filter Cards (with 16 channels each) and 15 ADF-2 cards (with 32 channels each). Abbreviations: -------------- BVDC-? Bias Voltage Distribution Card 16 or 32 channel ? This is inside the cryostat and must not contaminate LAr. PFC-16 Preamplifier and Filter Card 16 channel The preamps are built right on the PFC-16 card. D-Zero hybrid preamps are not used. ATC ADF Transition Card a card from D-Zero the passive back of the backplane connector adaptor card for ADF-2 ADF-2 Analog Digital Filter - version 2 a card from D-Zero It is the ADC and circular buffer and VME readout card. SCLD Serial Command Link Distributor a card from D-Zero it generates the timing signals that synchronously run up to 4 crates of ADF-2 cards Feedthroughs: ------------- Detector Signal Feedthrough 17 pair (of which 16 signal-ground pairs are used) 0.1" x 0.1" 2x17 connector all pins in this feedthrough are at zero Volts wrt cryostat ground Wire Bias Voltage Feedthrough must hold off +- 500 Volts Commercial hermetic SHV connectors ? Cables: ------- TPC to BVDC just wires jumpers an inch or two long the BVDC should mount directly on the TPC detector wire frame BVDC to Signal Feedthrough twisted pair with 50 mil pitch flats for 0.1" x 0.1" mass termination connectors must not contaminate LAr Signal Feedthrough to PFC-16 standard 17 pair twist and flat with standard mass termination connectors 2x17 0.1" x 0.1" PFC-16 to ATC 36 conductor 3M Pleated Foil Cables how long ? i.e. what is the distance from cryostat to VME readout crate ? Bias Voltage Feedthrough to BVDC coax +- 500 Volt Preamp Power Cables - from the Preamp Power Supply to Shield Box Preamp Power Distribution Cable Assembly This assembly includes the fuses and filters for providing power to individual PFC-16 cards. Most of this cable assembly mounts between the outer and inner shield boxes. It may be easiest to make part of this a pcb. Cards: ------ BVDC-? A 16 or 32 channel card that is inside the cryostat. It provides: the final Bias Voltage filtering, the Bias Voltage distribution resistor network, and the DC blocking capacitors on the readout signal lines. It must not contaminate the LAr. It should mount very close to (e.g. directly on) the wire frames to minimize the connection length to the detector wires. It needs access to the very best stiff signal ground inside the cryostat (i.e. the bottom of the readout port shield tube). This card needs to be designed. Resistors and capacitors need to be found that work at LAr temperature and do not contaminate the LAr. The connections to this card are: 16(32) wire signals directly from the detector wires, very good signal ground connection, Wire Bias Voltage, connector(s) for 16(32) twisted pair readout cable(s) to the signal feedthrough. The pitch of the "channels" on this card must be 3mm or is it 5mm ? PFC-16 Preamplifier and Filter Card It will be 16 channels. The preamps are built right on the PFC-16 card. It does not need the, hard to modify for LArTPC work, D-Zero hybrid preamps. It needs to be designed. It is just a PMB-16 card from the Bo LArTPC with the Bias Voltage filtering and distribution and DC blocking capacitors and individual input signal connectors pulled off and the FET stage of the D-Zero preamp put on. It is smaller than a PMB-16 and not as tall. Other changes: use a 2x17 0.1" x 0.1" input connector, use only one output connector (i.e. only 32 channel feed to the ADF-2 will be possible), move the power connectors to the output connector side. ATC For 480 channels you need 15 ATC cards to feed the analog signals to the back of the VME crate backplane. This many spare ATC cards are available because a number of these cards were built with a defective a LVDS connector section that is not used in the LArTPC application. I saved these useless for D-Zero cards. ADF-2 There are a total of 20 spare ADF-2 cards. In the LArTPC application this card provides: the ADC, the 2048 stage circular buffer, and the VME readout functions. I must keep 8 spare ADF-2 cards at D-Zero to have a spare of each species of ADF-2 card ready to use if there is trouble with the running D-Zero system. The 8 species come from 4 different analog input ranges and in each range either the "maestro" type or "normal" type (this difference is just the installation of jumpers). There are 3 ADF-2 cards in the PAB Bo LArTPC system. They have talked about wanting an additional ADF-2 card to readout some more stuff, e.g. what trigger fired and other operating conditions. SCLD This is a card from Saclay with all MSU firmware on it. It controls the synchronous operation of up to 4 crates of ADF-2 cards. There are a total of 3 of these cards in existence. One is the running D-Zero system. One spare at D-Zero. The one "extra" SCLD card is in the PAB Bo LArTPC system. I do not even have one to run stuff at MSU any more. How to get around the problem of not having enough SCLD cards ? The SCLD card uses an SCL Receiver mezzanine card for which there are spares. Software and Firmware: ---------------------- DAQ-96 System Is this OK "as is" for T962 ? Do they want the Software MS/windows version or Linux version ? With going from 96 channels to 480 channels will it be fast enough for T962 ? It was explicitly not designed/written for speed. Have they seen it running ? ADF-2 Firmware Is something different needed for T962 than for PAB Bo LArTPC ? That is 2048 stage circular buffers, 198 nsec per step. Full readout i.e. no zero suppression. SCLD Firmware Is special SCLD firmware needed for T962 ? i.e. something different than what is used at DAB. Boxes, Crates, and Power Supplies: ---------------------------------- Outer Shield Box This starts life as a commercial steel NEMA box. It mounts right over the readout port. It provides the first layer of shielding and it provides mechanical support for parts inside of it. Inner Shield Box This is probably a fully custom made box. It mounts right onto the readout port and provides shielding for the PFC-16 cards and for the signal cables from the feedthrough to these cards. It provides the mechanical support and the major signal ground connection to the PFC-16 cards. Design challenges include how to mount the PFC-16 cards so that you can pull one out without unstacking the others, and how to provide cooling air and shielding. Preamp Cooling Mount this remote from the Preamp Box as in Air Blower PAB Bo LArTPC system ? Commercial blower with custom mounting and air ducts. Power Supply for PFC-16 cards -6V and +8V for the Preamps -5V and +5V for the Filters About 1/2 Watt per channel !! Made from commercial (linear ?) supplies. May need an input isolation transformer. VME Crate Wiener VME-64x 6U with Wiener +-5 Volt analog supplies instead of +-12 Volt VME supplies. About 10k $. First Stage Bias Voltage Filters These mount between the outer and inner shield boxes. This filters the Bias Voltage enough so that you dare let it into the cryostat. Two stages of RC. Over Voltage varistor protection. Isolated ground SHV input connectors. It includes 1/2 of the R for the final stage Bias Voltage filter which is inside the cryostat. Computer and VME Interface: --------------------------- DAQ Computer MS or Linux ? Bit-3 DAQ Computer pci to VME Crate optical interface about 4k$