CM26 March 2010 Slide 1

EMR StatusEMR Status

o Intro

o Construction

o Magnetic shielding

o Electronics

o Prototype Cosmics test

o Schedule

Jean-Sebastien Graulich, Geneva

EMR: Electron Muon EMR: Electron Muon RangerRanger

This report is about a team workThis report is about a team work Como/Trieste:

Michela Prest, Erik Vallazza, Daniela Lietti, Davide Bolognini

University of Geneva: Franck Cadoux, Florian Maschiotti, Laurent Nicola, Coralie Husi Pierre Bene, Stephane Debieux Havard Wisting, Kaspar Rothenfusser

Ghislain Grégoire

A lot happened, trying to summarizeA lot happened, trying to summarize Refer to previous presentations for more details

EMR talk at CM25 EMR Construction Status at VC128

http://mice.iit.edu/vc/vc128/vc128_cadoux_emrstatus.ppt

EMR Cosmic Tests at VC129 http://mice.iit.edu/vc/vc129/vc129_graulich_emrcosmics.ppt

EMR Installation talk at CM2 http://cm26.ucr.edu/wp-content/uploads/presentations/MICE_EMRMar10.pdf

CM26 March 2010 Slide 2

CM26 March 2010 Slide 3Daniela Lietti CM25

http://indico.cern.ch/getFile.py/access?contribId=28&sessionId=3&resId=0&materialId=slides&confId=69027

ConstructionConstruction

Main StepsMain Steps Cutting to length – done Gluing fibers (up to 20 per day) Layer Assembly Module Assembly

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IntegrationIntegration

Extremely compact assemblyExtremely compact assembly

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Outer Box Difficult access to PMT and Difficult access to PMT and electronics after Assemblyelectronics after Assembly

Just enough room for local Just enough room for local shieldingshielding

Heating of electronics (FPGA, HV Heating of electronics (FPGA, HV dividers, etc dividers, etc

FEB

Flex connector

The PMT is attached to the board

Shielding not shown

Magnetic Shielding Magnetic Shielding IssueIssue

Situation looked difficultSituation looked difficult Impossible to shield locally

CM26 March 2010 Slide 6

3D model from Ghislain (OPERA 3D)

EMR thickness

Plot Field vs PMT location

Magnetic Shielding Magnetic Shielding SolutionSolution

First: Global shieldFirst: Global shield 50 mm thick iron plate EMR is moved back (reduce acceptance)

Second: Local shield on PMTSecond: Local shield on PMT

CM26 March 2010 Slide 7

EMR PMT axis

CM26 March 2010 Slide 8Slide 8

Magnetic Shielding Magnetic Shielding SummarySummary

The problem was more serious than The problem was more serious than originally thoughtoriginally thought

We have now a satisfactory designWe have now a satisfactory design Large iron reflector between KL and EMR EMR is moved back by 50 mm Local shielding (1m) around each PMT

We had to stop detector productionWe had to stop detector production 2 months delay

The PMT-Fiber coupling had to be The PMT-Fiber coupling had to be modifiedmodified

We are ready to resume productionWe are ready to resume production

CM26 March 2010 Slide 9

ElectronicsElectronics

Each bar is read out on both side but with independent Each bar is read out on both side but with independent chainschains

Digital readoutDigital readout Each bar is connected to one pixel of a 64 channels MultiAnode PMT The PMT is connected to a Front End Board (FEB) where the signal is

amplified and discriminated The logic signal from the FEB is sampled by a Digitizer and Buffer Card

(DBC) The DBC stores the data for the entire duration of the spill The DBC is read out through a VME Controller card at the end of the spill

Analog readoutAnalog readout On the other side All the fibers from each are bunched together and coupled to a single 1”

PMT The output of the PMT is connected to one channel of a 500 MHz

sampling ADC (CAEN V1731) The data is buffered in the ADC and readout at the end of the spill

CM26 March 2010 Slide 10

CM26 March 2010 Slide 11

Electronics StatusElectronics Status

FEBFEB Designed and produced by Trieste/Como Based on existing FEB for another experiment (ASACUSA@CERN

AD) Recently modified and tested to use the MAROC

amplifier/discriminator chip (instead of Gamma Medica/Ideas VA64TAP)

Digitizer and Buffer CardDigitizer and Buffer Card Design in progress in Geneva

VME ControllerVME Controller Based on general purpose VME board provided by Trieste/Como

Clock and Trigger distributionClock and Trigger distribution Under discussion

Sampling ADCsSampling ADCs In hand in Geneva

CM26 March 2010 Slide 12

Cosmics TestCosmics Test One full module (2 layers) operational in GenevaOne full module (2 layers) operational in Geneva DAQ provided by Como/TriesteDAQ provided by Como/Trieste Many Thanks to Daniela Lietti and Davide Bolognini Many Thanks to Daniela Lietti and Davide Bolognini

CM26 March 2010 Slide 13

2 X-YSilicon strip

detectors10x10 cm2

TriggerScintillator10x10 cm2

2 EMRLayers

The first EMR The first EMR ModuleModule

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XY

Single anode PMTAll fibers bunched

FEB

Multi-anode PMTcoupled to FEB

Analysis – Analysis – Prerequisite Prerequisite

Using the prototype Front-End Board Using the prototype Front-End Board based on the VA64TAP chipbased on the VA64TAP chip

Need to scan the sampling time to determine our working point

CM26 March 2010 Slide 15

Trigger Time

Hold TimeSampling Time

Value

Signal after Shaping

EfficiencyEfficiency

Standard PMTEfficiency ~93 %

Green Enhanced PMTEfficiency ~98 %

Testing different configurationsTesting different configurations High Voltage scan With/Without Optical grease Standard/Green enhanced PMT

Two independent analysisTwo independent analysis Trieste/Como : Michela Prest and Davide Bolognini Geneva: Havard Wisting

Cross talkCross talk

Obvious cross talk between channelsObvious cross talk between channels Between anodes

Partially due to the PMT alignment Not only !

Between fibers ? Can improve fiber isolation…

CM26 March 2010 Slide 17

Cosmics test Cosmics test SummarySummary

Currently taking data at about 3 HzCurrently taking data at about 3 Hz Efficiency Measurement consistent with Efficiency Measurement consistent with

First prototype results: ~97.5 %First prototype results: ~97.5 % Cross talk is a serious issueCross talk is a serious issue Next StepsNext Steps

Integrate the single PMT readout in the DAQ Need to migrate from SBS Bit3 to CAEN VME-PCi

interface first Test with the first production module

1.2 mm fibers More precise PMT lodging

Define automatic test procedure for QA during production

CM26 March 2010 Slide 18

Project PlanProject Plan

Running full speed, we need 6 working days to Running full speed, we need 6 working days to produce 1 module (2 layers)produce 1 module (2 layers)

=> Production time: 7 months => Production time: 7 months EMR production should end in October 2010EMR production should end in October 2010 Digitalization and Buffer card design test and Digitalization and Buffer card design test and

productionproduction Estimated to 6 months

We are considering a partial delivery to RAL this We are considering a partial delivery to RAL this summer in order to have an early test of summer in order to have an early test of integration in the DAQintegration in the DAQ

We also depend on other experiment pressure on We also depend on other experiment pressure on our Engineer/Technician staffour Engineer/Technician staff

CM26 March 2010 Slide 19