vc feb 2010slide 1 emr construction status o general design o electronics o cosmics test...
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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
VC Feb 2010 Slide 2
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
VC Feb 2010 Slide 4
VC Feb 2010 Slide 5
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
VC Feb 2010 Slide 6
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
VC Feb 2010 Slide 7
2 X-YSilicon strip
detectors10x10 cm2
TriggerScintillator10x10 cm2
2 EMRLayers
The first EMR The first EMR ModuleModule
VC Feb 2010 Slide 8
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
VC Feb 2010 Slide 9
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)
VC Feb 2010 Slide 10
Neighbor channels on the fiber mask
Spatial Correlation Spatial Correlation
VC Feb 2010 Slide 11
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
VC Feb 2010 Slide 12
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
VC Feb 2010 Slide 13
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
VC Feb 2010 Slide 14
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
VC Feb 2010 Slide 15
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
VC Feb 2010 Slide 16
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