Dec 2005Jean-Sébastien GraulichSlide 1 Improving MuCal Design o Why we need an improved design o Improvement Principle o Quick Simulation, Analysis & Results.

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Presentation transcript:

Dec 2005Jean-Sébastien GraulichSlide 1 Improving MuCal Design o Why we need an improved design o Improvement Principle o Quick Simulation, Analysis & Results o Pros & Cons

Dec 2005Jean-Sébastien GraulichSlide 2 Why an improved design  CKOV2 funding is uncertain  EmCal mu+/e+ is not straightforward Using many parameters with Complicate (Neural Net) Analysis Stability vs MICE configuration ? Systematics ? Separation Requires P and TOF measurement -> How do we do in Stage I ? (No P measurement !) Precise Energy Measurement -> ADC Problem  EmCal (Kloe) design is optimized for higher energy muons 200 MeV/c muons are stopped in the middle Inhomogeneous material -> spread in muon range -> spread in visible energy

Dec 2005Jean-Sébastien GraulichSlide 3 Improvement Principle  Start with a rather thin high Z material layer Stop primary positrons and convert them into gammas and soft e+/e-  Several layers of plastic scintillators (low Z) Large Muon range -> long tracks with large energy deposit/layer Soft e+/e- -> scattered hits with small energy deposit Nearly Transparent to gammas (low Z)  Problem with low energy muons (<120 MeV/c) They stop in the first (high Z) layer Maybe TOF can help e+e+e+e+ µ+µ+µ+µ+

Dec 2005Jean-Sébastien GraulichSlide 4 Quick Simulation  First layer (Converter) = 1 Kloe layer (4 cm thick, 8 cm wide)  11 Layers of scintillator, 2 cm thick, 8 cm wide (15 slabs/layer)  A passive plastic layer has been introduced : bad idea ! This kills the muon detection efficiency below 150 MeV/c Mu Efficiency is estimated only above this threshold  Many thanks to Rikard 162 MeV/c Muon Kloe 4 cm Passive 6 cm

Dec 2005Jean-Sébastien GraulichSlide 5 Simulated Beam  Using an old Turtle beam (small divergence) Same as Rikard used 3 month ago  Small number of positrons 256 e +, only 199 reach MuCal in a 20 ns time window µ+ over 150 MeV/c

Dec 2005Jean-Sébastien GraulichSlide 6 Low thr: 200 keV High thr: 2.5 MeV Quick Analysis  No realistic digitization yet Using True Visible Energy with 10% resolution  No charge measurement: Only two level discriminator: low/high signal No clustering, signal sharing ignored. - Muons - Positrons

Dec 2005Jean-Sébastien GraulichSlide 7 Quick Analysis  Looking at Track Length Counting only high level hits Taking the maximum length of continuous track X,Y Segmentation not used, the highest hit in the layer is taken  Looking at low level hits Just count the layers where there is a low level hit and no high level hit Again X,Y Segmentation not used  Rem: X,Y Segmentation is used only for digitization, not for analysis Muons have long tracks and no low level hits e + have short tracks and many low level hits

Dec 2005Jean-Sébastien GraulichSlide 8 Quick results  This can be reduced to one single parameter Continuous intense track length index = High level track length divided by the number of sparse low level hits Cut at 1

Dec 2005Jean-Sébastien GraulichSlide 9 Results Summary  Muon efficiency (over 150 MeV/c): 99.7 %  Positron rejection efficiency (all energies): 98.4 %  Purity of the muon sample: %  Main Losses: mu decay either in flight or in the time window (20 ns)

Dec 2005Jean-Sébastien GraulichSlide 10 Background study  Main background: Coincidence with muon decay Either the one just arriving or a previous one Main effect: The continuity of the track is affected; a muon is misidentified as a positron Small bias (decay in flight probability slightly depends on the momentum) Higher order effect: The decay product piles up with a positron, producing a fake track. Highly suppressed by geometric factor if segmentation is used in the calculation of the track length  Case studied: A muon piles up with its own decay product Studied by increasing the time window at the digitization level: 20 ns -> 100 ns  Results: Mu Efficiency drops to 97 %

Dec 2005Jean-Sébastien GraulichSlide 11 Pros and Cons  Easy mu/e separation 1 parameter with physics signification  No need for CKOV2  Simple, “cheap” technology  No need for good energy resolution  Similar design can do mu/pi separation in Stage I (ask Rikard)  Allow triggering on high P muons (in phase w RF)  Need more Pmts  Who can build it?  Need help to find more cons…