Status of the PANDA TPC simulation software
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1 Status of the PANDA TPC simulation software Felix Böhmer Physik Department E18 Technische Universität München PANDA collaboration GSI March 2, 2009 Felix Böhmer (TUM E18) TPC software status March / 23
2 Overview Update on TPC momentum resolution studies Review of data from December New results Comparison to short TPC chamber (120cm) Current problems Energy loss studies for GEANT3 standard and GEANT3 ALICE Comparison of energy loss models Problems Conclusion Felix Böhmer (TUM E18) TPC software status March / 23
3 Remember December... Preliminary results shown at PANDA collaboration meeting in December: Felix Böhmer (TUM E18) TPC software status March / 23
4 Since then Increased statistics by factor 5 Fixed minor bugs in the reconstruction Studied and tuned ALICE MC parameters Data features: ALICE MC model (more to come) 5000 pion tracks (FairBoxGenerator) for each bin at fixed momentum, fixed scattering angle, azimuth free Full digitization: Clusterizing (ALICE!), diffusion, pad response, electronics Reconstruction using genfit (track finding based on MC truth, GEANE track representation, Kalman Fitter) TPC hits only! Felix Böhmer (TUM E18) TPC software status March / 23
5 Results 1: Long chamber (150cm) Felix Böhmer (TUM E18) TPC software status March / 23
6 Results 1: Methodology acquire momentum from successful fit fit distribution with gaussian and extract sigma Felix Böhmer (TUM E18) TPC software status March / 23
7 Results 2: Short chamber (120cm) Felix Böhmer (TUM E18) TPC software status March / 23
8 Results 3: Direct comparison Conclusion: We lose 5-10 degrees of good momentum resolution Felix Böhmer (TUM E18) TPC software status March / 23
9 Problem 1: Reconstruction broken for some bins Some bins had been masked out so far... Reason: Reconstruction problems Some bins in the momentum resolution are too low Felix Böhmer (TUM E18) TPC software status March / 23
10 Problem 1: Reconstruction broken for some bins Some bins had been masked out so far... Reason: Reconstruction problems Some bins in the momentum resolution are too low Felix Böhmer (TUM E18) TPC software status March / 23
11 Problem 1: Reconstruction broken for some bins Issue is reproducible for certain angles (already seen in old data from December) Speculation: Track initialized with MC truth Idea: Covariance matrix for one Kalman steps gets too small rest of the hits wil not be taken into account Connection to geometry (110 deg) unclear Under investigation Felix Böhmer (TUM E18) TPC software status March / 23
12 Problem 2: Behaviour at high momenta Another issue: higher momenta Fluctuations around the true momentum resolution grow bigger Reason: Statistics need more tracks for smoother distributions and better fits Felix Böhmer (TUM E18) TPC software status March / 23
13 Conclusion & Outlook momentum resolution Presented momentum resolution for full simulation based on TPC hits only from ALICE MC data Resolution better than 3% for 1 GeV momentum Cutting the chamber to 120cm length removes 5-10 deg of effective angle with good resolution There are still problems with the reconstruction: Strange behaviour for certain (momentum,angle) combinations Occasional crashes, e.g. GEANE producing floating point exceptions High momenta require more statistics Outlook Next step: Simulation with long setup & 3 GEM stations and short setup & 4 GEM stations Felix Böhmer (TUM E18) TPC software status March / 23
14 Why ALICE MC? GEANT3 standard: Create MC hits only when crossing boundaries between different media or when reaching a certain energy loss threshold Soft energy loss from tables + Landau-Vavilov straggling Problems MC hits have nothing to do with the real physical hits Unsatisfactory cluster distribution method for a TPC This method also may produce unphysical depletion / accumulation of clusters around the MC hits GEANT3 standard produces some features that are not understood, e.g. de/dx distribution Felix Böhmer (TUM E18) TPC software status March / 23
15 How does ALICE MC work? GEANT3 ALICE: Sample next steplength L from from pdf f (x) = 1 λ exp( x λ ) L = λln(r) (λ: mean free path, r: random number [0,1]) Force GEANT to make a step there λ(p) ( de dx ) 1 from normalized Bethe-Bloch parameterization Energy loss directly obtained from a tuned Rutherford cross section [ B. Lasiuk, NIM A409, ] Felix Böhmer (TUM E18) TPC software status March / 23
16 Energy loss in G3 and G3 ALICE GEANT3 standard shows a strange second bump (for STRA=0) in the energy loss distribution: Felix Böhmer (TUM E18) TPC software status March / 23
17 Conclusion GEANT3 in standard configuration not optimal for a gas detector MC point creation unphysical Energy loss distribution unclear ALICE configuration much more transparent: Physical cluster distribution, no clustering by hand Simple and transparent energy loss model (LOSS=5, see gfluct.f in the geant package) Performance: Slower, but acceptable G3 ALICE will be the default for the TPC simulations Thank you for your attention! Felix Böhmer (TUM E18) TPC software status March / 23
18 Backup slide: TPC geometry Felix Böhmer (TUM E18) TPC software status March / 23
19 Backup slide: GEANT4 energy loss Felix Böhmer (TUM E18) TPC software status March / 23
20 Backup slide: GEANT3 standard TPC hits Felix Böhmer (TUM E18) TPC software status March / 23
21 Backup slide: GEANT3 ALICE TPC hits Felix Böhmer (TUM E18) TPC software status March / 23
22 Backup slide: GEANT4 standard TPC hits Felix Böhmer (TUM E18) TPC software status March / 23
23 Backup slide: G3 ALICE configuration Set max. number of G3 steps to very high value: geant3->setmaxnstep( ); Set energy LOSS energy model to unofficial value 5 (see gfluct.f): gmc->setprocess("loss",5); Calculate steplengths etc. in the FairDetector class Adapt clusterization Delta electrons: Just as you like, set DCUTE DCUTM CUTELE Felix Böhmer (TUM E18) TPC software status March / 23
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