VC Feb 2010 Slide 1

EMR Construction StatusEMR Construction Status

o General Design

o Electronics

o Cosmics test

Jean-Sebastien Graulich, Geneva

EMR General DesignEMR General Design

EMR: Electron Muon RangerEMR: Electron Muon Ranger EMR is needed to supplement KL for Downstream EMR is needed to supplement KL for Downstream

PID (PID (/e separation)/e separation) EMR is a ~1 tone Fully Active Scintillator EMR is a ~1 tone Fully Active Scintillator

Detector: Detector: 0.8x1x1 m3

highly segmented in x, y and z

In addition to PID, it’s able to measure the muon In addition to PID, it’s able to measure the muon momentum with a resolution of 2.5 MeV/cmomentum with a resolution of 2.5 MeV/c

much better than the spectrometer at low pT

For detailed description, refer to Frank’s talk at For detailed description, refer to Frank’s talk at last VClast VC

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VC Feb 2010 Slide 3Daniela Lietti CM25

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

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 then 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

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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

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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

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2 X-YSilicon strip

detectors10x10 cm2

TriggerScintillator10x10 cm2

2 EMRLayers

The first EMR The first EMR ModuleModule

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XY Single anode PMT

All fibers bunched

FEB

FEB(old design)

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

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Trigger Time

Hold TimeSampling Time

Value

Signal after Shaping

TrackingTracking Selecting single events in the Si-Array, the Selecting single events in the Si-Array, the

track are extrapolated to the EMR position track are extrapolated to the EMR position -> Residuals look OK Strong evidence for cross talk (for this prototype we use

of 2 x 0.8 mm fibers instead of a single 1.2 mm fiber)

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Neighbor channels on the fiber mask

Spatial Correlation Spatial Correlation

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PM1

PM0

Low value → bad coupling or problem with the ASIC channel?

Inversion of one of the two fibers of each channel

Efficiency Efficiency CalculationCalculation

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Extrapolate the tracks to the EMR planes

Identify the fiducial surface used for the computation of efficiency ( Limited by statistics)

Efficiency calculated with both single -and multi - cluster events

To define the cluster: cut on the PH

Two clusters are considered as separated if the two maxima are separated of at least 2 bars

Measured EfficiencyMeasured Efficiency

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PM0PM0

ACROSS THE BARSACROSS THE BARS

AVERAGE ALONG THE BARAVERAGE ALONG THE BAR

PM1PM1

Overall HomogeneityOverall Homogeneity

Analysis performed byAnalysis performed by

Michela Prest Michela Prest in Comoin Como

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There is a 2% difference in efficiency between the two planes. Under investigation. Probably due to crosstalk contribution (TBC)

These values do not change with hold time → intrinsic efficiency?

An independent analysis is being performed by Havard Wisting at Univ. of Geneva

Cosmics test Cosmics test SummarySummary

Currently taking data at about 3 HzCurrently taking data at about 3 Hz Preliminary average efficiency is 93.5 %Preliminary average efficiency is 93.5 % Next StepsNext Steps

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

interface first Refine Efficiency Measurement

Optical grease for better optical connection Green Enhanced MA-PMTs Test flex connectors needed for final assembly

Define test procedure for QA during production

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Project PlanProject Plan

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

=> Production time: 7 months => Production time: 7 months EMR production should end in September EMR production should end in September

20102010 Digitalization and Buffer card design test Digitalization and Buffer card design test

and productionand production Estimated to 6 months Current design doesn’t allow mounting electronics

after assembly -> New design under study

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

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