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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
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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
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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
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Digital Jumper Cable Readout Setup
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New Board Design (Tom Emory, ZDG)– Made at Fermilab
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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
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Kasi Godavarthi’s Work
• Laser Testing to Determine the Charge
Distribution in Adjacent Channels of Silicon
Detectors at FermiLab
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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.
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High Voltage Patch Panel - 4
Karthik Reddy
Louisiana Tech. University
LTU Site Report
Dick Greenwood
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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.
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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.
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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.
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Patch Panel 4
 One of the series patch panels or
connectivity points
 Distribute the services to pixel detector.
 Physically located
 US15 and
 USA15.
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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.
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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
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LTU HVPP4
Site Report
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Simulation Software(PSpice)
• PSpice
• Components
– LM359-Norton dual current input amplifier.
– HCNR 200- opto-isolator
– Resistors and capacitors
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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.
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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
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Future HVPP4
• Finalize present design
• Analog amplifiers can be replaced by
magnetic amplifiers
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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)
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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
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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?
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The Large Detector Concept (LDC)
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•
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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
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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)
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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
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ETD Development
• GEM Prototypes
21SEP06
• SLIC vs MOKKA
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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).
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The End
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Extra Slides
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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
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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
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