Design Concepts for the LArIAT Punch-Through Veto - LArTPC DocDB
Design Concepts for the LArIAT Punch-Through Veto - LArTPC DocDB
Design Concepts for the LArIAT Punch-Through Veto - LArTPC DocDB
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Problems Faced in <strong>Veto</strong> <strong>Design</strong>●●Cosmic rays will also be detected by <strong>the</strong>scintillators potentially excluding usable eventsParticles exiting <strong>the</strong> TPC may scatter at wideangles and go undetected by a veto with asmall active area07/11/2013 Andrew Olivier 4
Available PaddlesPMTBSU CDF LongPaddleFishtail07/11/2013 Andrew Olivier 5
CDF Long Paddles● Dimensions: 16.7 x 148.3 cm2●Noisy PMTs●●Tests have been per<strong>for</strong>med which concludethat <strong>the</strong>se scintillators have significantlymore noise than is expected <strong>for</strong> fishtailpaddles (~ 60%)Run on about 13 V which is much lower than<strong>the</strong> supply voltage needed <strong>for</strong> Fishtails07/11/2013 Andrew Olivier 6
Efficiency and Noise MeasurementsIn CoincidenceTestedInCoincidence07/11/2013 Andrew Olivier 7
Efficiency and Noise Definitions●% Efficiency = (5-fold coincidence) / (4-foldcoincidence) * 100● % Noise = (Single – (3-fold)) / single * 100123-fold = ((1 and 2) or (5 and6)) and test345607/11/2013 Andrew Olivier 8
Data on CDF Long Paddles●Examples of scintillator paddle measurementsPercnet EfficiencyPercent Noise to Signal100.080.060.040.020.01000.0600 650 700 750 800 850 90080604020BSU 263 EfficiencyVoltage in mVBSU 263 Noise Versus Voltage0600 650 700 750 800 850 900Voltage in mV07/11/2013 Andrew Olivier 9
Fishtail Paddles● Dimensions: 30.96 x 99.54 cm2●Expected to be less noisy●●Tests have not yet been per<strong>for</strong>medRun on higher voltage (~ -1000V)07/11/2013 Andrew Olivier 10
<strong>Concepts</strong> <strong>for</strong> <strong>Veto</strong> PaddleArrangements●●●●Active area must be small to minimize detection ofparticles not related to events in TPCActive area must include most particles scattered atlarge angles from TPC●TPC dimensions are taken to be 40 cm x 47 cm x 90 cmMust provide accurate in<strong>for</strong>mation about whenparticles leave <strong>the</strong> TPCPaddles should be configured like Venetian blinds toavoid dead areas between scintillator paddles07/11/2013 Andrew Olivier 11
Original Concept : 4 Parallel FishtailPaddles●●Active Area: 124.0 cm x 90.5 cmIn one layer, so no coincidence readings can betaken.07/11/2013 Andrew Olivier 12
Concept 3: 4 Fishtail Paddles●●Active Area: 62.0 cm x 62.0 cmIn two layers primarily to provide best match toarea of TPC, but also allow <strong>for</strong> coincidencemeasurements to improve results07/11/2013 Andrew Olivier 14
Venetian Blind Configuration●Since <strong>the</strong> paddles' sides are not perfectlysmooth, <strong>the</strong>y should be staggered to avoidinactive areas between scintillators.07/11/2013 Andrew Olivier 15
Future Work and Conclusions●●●●Fishtail paddles must be tested to compareefficiencies and noise percentages with CDFpaddlesMust decide on size of active area of vetoPossibly modify dimensions of scintillators usedto better fit needed active areaAssemble and test veto once design has beendetermined07/11/2013 Andrew Olivier 16
Change language