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LTU Site Report Dick Greenwood Louisiana Tech University SW-USA TRACKER WORKSHOP University of Oklahoma January 15, 2007 LTU Site Report Dick Greenwood RunIIB Silicon Efforts at DØ With Andre Nomerotski, Marcel Demarteau, Ron Lipton Students: Moreshwar Dhole Sowmya Kandula Kasi Godivarthi LTU Site Report Dick Greenwood RunIIB Readout • One hybrid is an independent unit – Separate cable up to an accessible region • Same as in Run2A, proven to be successful during Run IIA commissioning – Minimizes readout time – Simpler testing and stave construction • Jumper Cable - Junction Card - Twisted Pair Cable – Adapter Card • New Adapter Card is active, implements necessary modifications • Junction Cards are located in an accessible area • Twisted Pair Cable is well suited for differential SVX4 readout 21SEP06 LTU Site Report Dick Greenwood 3 Digital Jumper Cable Hybrid - Jumper Cable - Junction Card - Twisted Pair Cable – Adapter Card – Designed by Kansas State – Same design for all layers – 10-12 different lengths, max length ~ 1 m – Kapton substrate, total thickness 250 um for L0-1, 330 um for L2-5 – HV on the same cable – AVX 50-pin connector on both sides – Layout reviewed and prototypes ordered in January 2002 – From Honeywell (Run2A low mass cables) – Back in March 2002 – Electrical, mechanical tests OK – Second vendor : Basic Electronics – Received 10 cables, tested OK 21SEP06 LTU Site Report Dick Greenwood 4 A Closer Look At the Digital Jumper Cables • • • • • • Low-Mass Flex-Circuit Striplines 11 Differential Signal Pairs 6 Single-Ended Signals 5 Sense Lines 2 Supply Voltages and Ground Returns Initial Task: Test Prototype 50 cm Digital Jumper Cables – Measure resistance – Check for cross-talk – Measure impedance 21SEP06 LTU Site Report Dick Greenwood 5 Digital Jumper Cable Readout Setup 21SEP06 LTU Site Report Dick Greenwood 6 New Board Design (Tom Emory, ZDG)– Made at Fermilab 21SEP06 LTU Site Report Dick Greenwood 7 Sowmya Kandula’s Work • Burn-in tests and the functionality tests of Layer 0 hybrids – crucial in ensuring the desired operation of the readout chain • Employed the new custom made SVX4 chips which were also tested – found to be very reliable and well-suited to the needs of the DØ experiment 21SEP06 LTU Site Report Dick Greenwood 8 Kasi Godavarthi’s Work • Laser Testing to Determine the Charge Distribution in Adjacent Channels of Silicon Detectors at FermiLab 21SEP06 LTU Site Report Dick Greenwood 9 Laser Testing •Final characterization of silicon detectors made by using the laser test system. •The laser was pulsed externally using a pulse generator. •EG&G 1064nm laser was used. •Light was transmitted via an 6.2um optical fiber. •Principle of operation. •Pulse height measurements are used to identify dead channels and also to determine various electrical characteristics of the detectors such as depletion voltage and leakage currents. •The total number of dead and noisy channels had to be less than 5% of the total channels in the detector. •The detector is placed on a table which can move both in horizontal and vertical directions. •The lens system is fixed to a system which can move in the vertical axis with a micrometer is attached. 21SEP06 LTU Site Report Dick Greenwood 10 High Voltage Patch Panel - 4 Karthik Reddy Louisiana Tech. University LTU Site Report Dick Greenwood 21SEP06 LTU Site Report Dick Greenwood 12 Introduction • HV and LV deliver power to – half staves – disk sectors related to PP4 which connect to each detector module individually • PP4 crates provide – current monitoring for single individual modules. 21SEP06 LTU Site Report Dick Greenwood 13 High Voltage System The simplest one A unique requirement of the HV distribution system is that the modularity, the number of detector modules supplied in parallel with same supply channel, be configurable from 6/7 modules per HV supply channel to 2 modules per channel. 21SEP06 LTU Site Report Dick Greenwood 14 High Voltage System HV supplies are present in US15 and USA15 Connect 6/7 modules to a single High voltage supply channel via HVPP4. HVPP4 also provides individual current measurements via ELMB. Uses I-Seg 16 channel system to drive the PP0 systems. 21SEP06 LTU Site Report Dick Greenwood 15 Patch Panel 4 One of the series patch panels or connectivity points Distribute the services to pixel detector. Physically located US15 and USA15. 21SEP06 LTU Site Report Dick Greenwood 16 Need for Current Monitoring • To isolate the detector. • Because we connect 6/7 modules for each High Voltage Line. It is necessary to monitor the curren in each module and also to know how much current is being drawn by a single module. • Also to monitor the current in each module after they are exposed to the radiation. 21SEP06 LTU Site Report Dick Greenwood 17 Electrical Requirements • Measurement Accuracy should be at least 5%. • Measurement range should be 0.4uA-4mA. • Measurements circuits must be interface to the ELMB ADC inputs. • Circuit design should withstand 700vDC. • Life of the circuit 14NOV06 LTU HVPP4 Site Report Dick Greenwood 18 Simulation Software(PSpice) • PSpice • Components – LM359-Norton dual current input amplifier. – HCNR 200- opto-isolator – Resistors and capacitors 21SEP06 LTU Site Report Dick Greenwood 19 21SEP06 LTU Site Report Dick Greenwood 20 Protection of detector • Design steps to protect the detector – Current tapped across the resistance is given as input for the two pins of LM359. – The output of this amplifier is given as input to the othe amplifier acting as voltage amplifier. – The sole purpose of this amplifier is to give the supply voltage to the optoisolator(HCNR200). – The light emitted by the LED in the opto-isolator is absorbed by the phototransistors. 21SEP06 LTU Site Report Dick Greenwood 21 Protection of detector • Steps continued.. – Opto-isolator has two outputs, one is given as feedback to the second stage amplifier – Other output is input to a buffer – Output of the buffers is then fed to ELMBs – Current sensed is transmitted to DCS via CAN 21SEP06 LTU Site Report Dick Greenwood 22 Future HVPP4 • Finalize present design • Analog amplifiers can be replaced by magnetic amplifiers 21SEP06 LTU Site Report Dick Greenwood 23 ILC R&D Program at Louisiana Tech University Lee Sawyer SW-USA Tracker Workshop Norman, OK 15 Jan 2007 LTU Site Report Dick Greenwood Detectors for the ILC • Currently there are “four” detector conceptual design collaborations – SiD: All silicon detector (Si tracking, W/Si calorimeters, …) Heavily U.S. – LDC: TPC as central tracker, with Si inner tracking, and W/Si EMCAL. Heavily European. – GLD: LDC with a Japanese accent. – 4th: Hauptman/Wigmans DREAM calorimeter with a detector concept (TPC, dual solenoids) wrapped around it. • In addition there are several international R&D collaborations (CALICE, LC-TPC, SILC) 21SEP06 LTU Site Report Dick Greenwood 25 Motivation for Forward Instrumentation • Luminosity Measurements – Measure differential Bhabha cross-section • May require greater angular coverage than trad. LUMCAL • Need > 0.1% luminosity determination at high energy • GigaZ running requires very precise (10-4) luminosity + beam energy determination – Other luminosity ideas? (WW, Z’s, …) • Hermiticity and Granularity – Important physics signatures require tracking up to cos(q) ≈ 0.99 • e+e- -> WW, other t-channel Standard Model processes. • Selectron searches • SUSY searches with small slepton-neutralino small mass differences – Tag electrons from gg – Tag low pT tracks • Additional Concerns for Very Forward Region – High Backgrounds – Monitoring Ebeam, Polarization 21SEP06 LTU Site Report Dick Greenwood 26 What Are the “Benchmarks” for Forward Instrumentation? • For luminosity measurement, polar angle resolution dq for forward elements as important as as dp/p – This should complemented by sufficient high energy resolution and electron ID in forward section of ECAL an LUMCAL • Energy Flow benchmark requires hermiticity and granularity – Final layout of far forward elements (LUMCAL, Bhabha counter, …) depends on machine interface. – How well can these different elements be incorporated into an energy flow algorithm? 21SEP06 LTU Site Report Dick Greenwood 27 The Large Detector Concept (LDC) • • • • TPC 5-lyr Pixel VTX det. Si strip inner det. Forward pixel & Si strip tracker • W/Si EM Cal • Fe-Scintillator or Fe-RPC HAD Cal. • 4 T solenoid w/ return yoke 21SEP06 LTU Site Report Dick Greenwood 28 ILC R&D at LA Tech • Primarily concentrating on the Endcap Tracking Detector (ETD) in LDC – Called FCH in the TELSA TDR • Forward Tracking Studies – Developing LDC geometry file for SLIC – Studying resolution requirements in the intermediate to forward angles. – Studying effect of the TPC endplate on tracking resolution at intermediate angles • Detector R&D – GEM chamber development with large foils – Compact GEM tracking chambers (thin material profile) – Collaboration between HEP and Nuclear groups at LA Tech (QWEAK experiment) 21SEP06 LTU Site Report Dick Greenwood 29 LA Tech on LDC • Took part in drafting current Detector Outline Document (DoD) – Co-Editor of Supplementary Tracking chapter – Includes some simulations results obtained at LA Tech • Simulation Wars: Two ways of generating detector simulations – SLAC: STDHEP input => SLIC GEANT interface => org.lcsim reconstruction – DESY: STDHEP input => MOKKA GEANT interface => MARLIN reconstruction – We have worked on geometry in both MOKKA and SLIC frameworks – Both branches use LCIO file format for output • E.g. Should be able to reconstruct SLIC output with MARLIN • We are testing this at LA Tech. • Detector R&D collaboration – Recently joined the LC-TPC collaboration • Common interest in gaseous detectors (GEMs, micro-megas) • Development of ETD cannot be independent of TPC endplate design 21SEP06 LTU Site Report Dick Greenwood 30 ETD Development • GEM Prototypes 21SEP06 • SLIC vs MOKKA LTU Site Report Dick Greenwood 31 Recent LCRD Proposal • Joint proposal with – – – – Oklahoma (Strauss), Indiana (van Kooten) and LA Tech (Sawyer, Greenwood, Wobisch; Wells) First step in a possible Forward Tracking R&D collaboration a la CALICE or LC-TPC. • Continuation of previously described work at LA Tech – Assistance from OK and IU in test beam, electronics development – Year 3 of 3-year renewal cycle. • Strong new effort from OK in forward tracking algorithms. • Collaboration in detailed forward studies, incl. low angle forward tracking (i.e. FTD). 21SEP06 LTU Site Report Dick Greenwood 32 The End 21SEP06 LTU Site Report Dick Greenwood 33 Extra Slides 21SEP06 LTU Site Report Dick Greenwood 34 A HV-PP4 is therefore not only capable of a current measurement of the HV-lines on a single module level (by the use of ELMBs), but it is also responsible for the correct mapping of the iseg HV channels to the detector modules. 16 HV-PP4 crates will be required for the experiment, each with up to 117 monitoring channels. 21SEP06 LTU Site Report Dick Greenwood 35 Current Monitoring The circuitry included in the HVPP4 design contributes to this protection system by sensing the current flowing through High voltage cables and making the reading available through ELMB to the DCS. 21SEP06 LTU Site Report Dick Greenwood 36