LTU Site Report Dick Greenwood LTU Site Report Dick Greenwood Louisiana Tech University SW-USA TRACKER WORKSHOP University of Oklahoma January 15, 2007

LTU Site Report

Dick Greenwood

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 DholeSowmya KandulaKasi Godivarthi

21SEP06 3LTU 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


Dick Greenwood

Digital Jumper CableHybrid - 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


Dick Greenwood

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


Dick Greenwood

Digital Jumper Cable Readout Setup


Dick Greenwood

New Board Design (Tom Emory, ZDG)– Made at Fermilab


Dick Greenwood

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


Dick Greenwood

Kasi Godavarthi’s Work

• Laser Testing to Determine the Charge Distribution in Adjacent Channels of Silicon Detectors at FermiLab


Dick Greenwood

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.

LTU Site Report

Dick Greenwood

High Voltage Patch Panel - 4

Karthik ReddyLouisiana Tech. University


Dick Greenwood


Dick Greenwood

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.


Dick Greenwood

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.

High Voltage System


Dick Greenwood

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.


Dick Greenwood

Patch Panel 4 One of the series patch panels or

connectivity points Distribute the services to pixel

detector. Physically located

US15 and USA15.


Dick Greenwood

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 current 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.

14NOV06 HVPP4 18LTU Site Report

Dick Greenwood

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


Dick Greenwood

Simulation Software(PSpice)• PSpice • Components

– LM359-Norton dual current input amplifier.

– HCNR 200- opto-isolator– Resistors and capacitors


Dick Greenwood


Dick Greenwood

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 other 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.


Dick Greenwood

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


Dick Greenwood

Future HVPP4• Finalize present design• Analog amplifiers can be replaced by

magnetic amplifiers

LTU Site Report

Dick Greenwood

ILC R&D Program at Louisiana Tech University

Lee Sawyer

SW-USA Tracker WorkshopNorman, OK15 Jan 2007


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)


Dick Greenwood

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() ≈ 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 – Tag low pT tracks

• Additional Concerns for Very Forward Region– High Backgrounds– Monitoring Ebeam, Polarization


Dick Greenwood

What Are the “Benchmarks” for Forward Instrumentation?

• For luminosity measurement, polar angle resolution for forward elements as important as as p/p– This should complemented by sufficient high

energy resolution and electron ID in forward section of ECAL and 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?


Dick Greenwood

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


Dick Greenwood

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)

Location of Region 1 Vertex Location of Region 1 Vertex DetectorDetector

Primary Collimator

GEM based Vertex Detector behind primary Collimator

Zoom InZoom In

5 mm Roahcell3 mm Argon

50 micron Copper

Focal Plane Detectors


Dick Greenwood

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


Dick Greenwood

ETD Development• GEM Prototypes • SLIC vs MOKKA


Dick Greenwood

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).


Dick Greenwood

The End


Dick Greenwood

Extra Slides


Dick Greenwood

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.


Dick Greenwood

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.

Documents

LTU Site Report Dick Greenwood LTU Site Report Dick Greenwood Louisiana Tech University SW-USA TRACKER WORKSHOP University of Oklahoma January 15, 2007