Presentation is loading. Please wait.

Presentation is loading. Please wait.

Analysis of the First Cosmic Ray Data Collected with the Complete ALICE TPC Philippe GROS.

Published byGregory Patrick Modified over 8 years ago

Similar presentations

Presentation on theme: "Analysis of the First Cosmic Ray Data Collected with the Complete ALICE TPC Philippe GROS."— Presentation transcript:

1 Analysis of the First Cosmic Ray Data Collected with the Complete ALICE TPC Philippe GROS

2 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/20162 Structure QGP, ALICE and the TPC Irregularities in the Cluster Data Characteristics of Clusters in Tracks

3 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/20163 Hadronic Matter baryons : 3 different colours ex : proton, neutron mesons : colour + anti-colour ex : pions - 6 quarks : up, down, charm, strange, top and bottom (+ anti) - 3 colours : red, green and blue (+anti) Normal matter is color neutral : quarks are in groups of 2 or 3 quark gluon

4 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/20164 Quark Gluon Plasma Increase temperature (ALICE) Increase density (SPS) QG P Hadroni c Matter π p n p n Quarks

5 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/20165 QGP : Phase Diagram QGP Early Univers e RHIC LHC SPS AGS Neutron Star ρ C ~1fm -3 T C ~200MeV Hadron Gas ρ T usus

6 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/20166

7 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/20167 Heavy Ion Collisions The LHC ATLAS ALIC E LHCb CMS 27 km circumference - ATLAS, CMS, LHCb : rare events in p+p 14 TeV (Tevatron : 2 TeV) - ALICE : all collisions in Pb+Pb 5.5 TeV per nucleon pair (RHIC : 0.2 TeV per nucleon pair) near Genève, on French-Swiss border Lac Léman Franc e Switzerlan d

8 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/20168 The Alice Experiment MUON ARM L3 magnet CENTRAL BARREL

9 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/20169 The Alice Experiment TPC tracking, dE / dx

10 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201610 ALICE TPC 5 m 88 m 3 Ne-CO 2 (90-10) BergenBratislava CERNCopenhagen Darmstadt TUFrankfurt GSI DarmstadtHeidelberg KIP Heidelberg PIKrakow Lund The ALICE TPC Collaboration

11 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201611 Operating Principle Diffusio n e e Constant drift velocity 2.84 cm μs -1 => time ~ distance => 3D Readout time : ~100 μs

12 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201612 ReadOut Sectors OROC IROC 4x7.5 mm 2 6x10 mm 2 6x15 mm 2 Total >570 000 pads (electronic channels) 2 x 18 sectors 8x8 pads pad wire

13 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201613 Electronics : PASA Pad signal has a long tail due to slow drifting ions

14 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201614 Electronics : PASA Pad signal is amplified and shaped

15 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201615 Electronics : ALTRO ~digital oscilloscope Total data in one event : ~ 1 GByte

16 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201616 Electronics : ALTRO ~digital oscilloscope Total data in one event : ~ 1 GByte

17 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201617 Electronics : ALTRO ~digital oscilloscope Total data in one event : ~ 1 GByte

18 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201618 Electronics : ALTRO ~digital oscilloscope Total data in one event : ~ 1 GByte

19 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201619 Electronics : ALTRO ~digital oscilloscope Total data in one event : ~ 60 MB (1 MB for p+p)

20 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201620 Clusters - Position - Width - Max Charge - Total Charge - cells ? 1 cell maximum dimension 5x5

21 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201621 Result : 3D tracking Test with one cosmic muon trackSimulation of an event in ALICE

22 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201622 Cosmic Test Setting A07 A06 A05 A04 A03 A02 A01 A00 Trigger & - 2 sets of scintillators to trigger on cosmic rays - Only 2 ReadOut Chambers for each run - No Magnetic Field

23 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201623 Cosmic Rays Test Cluster Data Ideas of the analysis  Focus on a few high statistic runs  Cluster data before tracking  Look for all anomalies (noises...) and study them in detail  Clean up the data to study tracks Examples of Results  Noises : Edges, "Ringing noise”  Anomalies : Floating wires in OROC A04

24 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201624 Edge Noise Events with 30 000 clusters (when max 159 clusters per track) ! Clusters in a sectorSignal in individual pads gating pulse

25 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201625 Background Noise : efficient cut - Noise has high frequency, real signal is shaped => small time spread = noise => we remove clusters with σ z <0.035 Now significantly reduced by new grounding and electronics settings σZ2σZ2

26 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201626 "Ringing Noise" - Huge amount of clusters in a very localised area - localised in space AND IN TIME ! - periodic pulsations of about 1cm periodicity in time direction z(=time) in cm number of clusters

27 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201627 Explanation - Present on almost every IROC at same position (probably close to gating grid signal input) - Important enough to produce clusters only on a few - Periodicity coming from remaining 2.5 MHz edge noise Can be uploaded as non-flat pedestal

28 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201628 Floating Wires on OROC A04 (1) Run 2643 : 1750 V on anode wires Event number pad direction (cm) row number Mean Total Charge in OROC4

29 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201629 Floating Wires on OROC A04 (2) Mean Total Charge Evolution in OROC4 Event number Row number

30 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201630 Probable explanation : floating anode wire Gate Anode (~1500V) Cathode (0 V) Row nRow n+1 Row n+2 Electrons trajectories ++

31 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201631 Probable explanation : floating anode wire Gate Anode (~1500V) Cathode (0 V) Row nRow n+1 Row n+2 Electrons trajectories + +

32 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201632 Probable explanation : floating anode wire Gate Anode (~1500V) Cathode (0 V) Row nRow n+1 Row n+2 Electrons trajectories

33 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201633 Clusters in Tracks Cluster Width vs Drift Length Cluster Width vs Track Angle Cluster Charge vs Drift Length

34 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201634 Cluster Width Without magnetic field σ 2 TOT = σ 2 geom + σ 2 diff + σ 2 angle = C 1 + C 2. L + C 3 tan 2 α Diffusion e e Constant drift velocity geometrygas characteristic

35 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201635 Angular Contribution track α pad effective width of the track

36 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201636 Cluster Width vs Drift Length effect of diffusion expectatio n time width

37 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201637 Cluster Width vs Drift Length Limit : uniform distribution 5 bins limit to the size of the cluster : optimised from 5 MHz sampling, measure at 10 MHz

38 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201638 Cluster Width vs Track Angle expectation s

39 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201639 Cluster Charge vs Drift Length exponential decrease : expected : 1% per m per ppmO 2 Fit : 5.3 % m -1 saturation effects => upper limit Satisfying result

40 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201640 Conclusion Corrections done :  new grounding, FEC replaced, software updated Some more tuning needs to be done  reconstruction Other details need more study  how does it behave, how to avoid irrelevant data Some problems in the data identified

41 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201641

42 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201642 Back-up slides

43 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201643 Hot spots after high freq. noise cut

44 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201644 Floating Pads : Clusters view

45 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201645 Floating Pads : Raw Data "Lucky" example : - 4 abnormal pads - signal looks "transferred" to the two extremities... => perhaps floating pads

46 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201646 Mapping Problem in IROCs

47 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201647 Mapping Problem in IROCs 1 pad

48 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201648 Mapping Problem in IROCs 1 track ?? ?

49 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201649 General View : noise measurement

50 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201650 Latest Improved Measurement Additionnal Grounding 4 groups of channels configured to access data memories with 90 0 phase shift

51 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201651 Random Noise Pads No visible pattern : random noise Track signal visible

52 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201652 High Multiplicity Events Shower : visible tracks, many clusters, higher energy Noise (?) : no tracks (strange clusters distribution) normal charge distribution. some cluster have a negative total charge (but no negative max charge) => software problem

53 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201653 Pad Response : clusters low angle tracks selection horizontal sectors (0&1) Single pads (mostly noise) The pad response and statistics induce a non uniform cluster distribution at the pad size scale 1 pad

54 Analysis of Cosmic Ray Data from ALICE TPC Philippe GROS 9/29/201654 Bias created by 2.5 Mhz Noise

Download ppt "Analysis of the First Cosmic Ray Data Collected with the Complete ALICE TPC Philippe GROS."

Similar presentations

Charm and beauty with ALICE at LHC

Charm and beauty with ALICE at LHC
CBM Calorimeter System CBM collaboration meeting, October 2008 I.Korolko(ITEP, Moscow)

CBM Calorimeter System CBM collaboration meeting, October 2008 I.Korolko(ITEP, Moscow)
Measurement of charmonia at mid-rapidity at RHIC-PHENIX  c  J/   e + e -  in p+p collisions at √s=200GeV Susumu Oda CNS, University of Tokyo For.

Measurement of charmonia at mid-rapidity at RHIC-PHENIX  c  J/   e + e -  in p+p collisions at √s=200GeV Susumu Oda CNS, University of Tokyo For.
Results from PHENIX on deuteron and anti- deuteron production in Au+Au collisions at RHIC Joakim Nystrand University of Bergen for the PHENIX Collaboration.

Results from PHENIX on deuteron and anti- deuteron production in Au+Au collisions at RHIC Joakim Nystrand University of Bergen for the PHENIX Collaboration.
Centauro and STrange Object Research (CASTOR) - A specialized detector system dedicated to the search for Centauros and Strangelets in the baryon dense,

Centauro and STrange Object Research (CASTOR) - A specialized detector system dedicated to the search for Centauros and Strangelets in the baryon dense,
Henrik Tydesjö May 5 2004 O UTLINE - The Quark Gluon Plasma - The Relativistic Heavy Ion Collider (RHIC) The PHENIX Experiment - QGP Signals Event-by-Event.

Henrik Tydesjö May O UTLINE - The Quark Gluon Plasma - The Relativistic Heavy Ion Collider (RHIC) The PHENIX Experiment - QGP Signals Event-by-Event.
Henrik Tydesjö March 17 2003 O UTLINE - The Quark Gluon Plasma - The Relativistic Heavy Ion Collider (RHIC) - The PHENIX Experiment - Event-by-Event Net-Charge.

Henrik Tydesjö March O UTLINE - The Quark Gluon Plasma - The Relativistic Heavy Ion Collider (RHIC) - The PHENIX Experiment - Event-by-Event Net-Charge.
Proportional Counters

Proportional Counters
D. Peterson, “ILC Detector Work”, Cornell Group Meeting, 4-October-2005 1 ILC Detector Work This project is supported by the US National Science Foundation.

D. Peterson, “ILC Detector Work”, Cornell Group Meeting, 4-October ILC Detector Work This project is supported by the US National Science Foundation.
Christina Markert Physics Workshop UT Austin November 11 2006 1 Christina Markert The ‘Little Bang in the Laboratory’ – Accelorator Physics. Big Bang Quarks.

Christina Markert Physics Workshop UT Austin November Christina Markert The ‘Little Bang in the Laboratory’ – Accelorator Physics. Big Bang Quarks.
JSPS Research Fellow / University of Tsukuba T. Horaguchi Oct. 15 2009 for HAWAII2009 2009/10/15HAWAII 20091.

JSPS Research Fellow / University of Tsukuba T. Horaguchi Oct for HAWAII /10/15HAWAII
Carleton University A. Bellerive, K. Boudjemline, R. Carnegie, A. Kochermin, J. Miyamoto, E. Neuheimer, E. Rollin & K. Sachs University of Montreal J.-P.

Carleton University A. Bellerive, K. Boudjemline, R. Carnegie, A. Kochermin, J. Miyamoto, E. Neuheimer, E. Rollin & K. Sachs University of Montreal J.-P.
Linear Collider TPC R&D in Canada Bob Carnegie, Madhu Dixit, Dean Karlen, Steve Kennedy, Jean-Pierre Martin, Hans Mes, Ernie Neuheimer, Alasdair Rankin,

Linear Collider TPC R&D in Canada Bob Carnegie, Madhu Dixit, Dean Karlen, Steve Kennedy, Jean-Pierre Martin, Hans Mes, Ernie Neuheimer, Alasdair Rankin,
 Production at forward Rapidity in d+Au Collisions at 200 GeV The STAR Forward TPCs Lambda Reconstruction Lambda Spectra & Yields Centrality Dependence.

 Production at forward Rapidity in d+Au Collisions at 200 GeV The STAR Forward TPCs Lambda Reconstruction Lambda Spectra & Yields Centrality Dependence.
Czech Techn. Univ Prague, 05.12.2008C. Lippmann (CERN) 1 The ALICE Time Projection Chamber... the World's largest Time Projection Chamber.

Czech Techn. Univ Prague, C. Lippmann (CERN) 1 The ALICE Time Projection Chamber... the World's largest Time Projection Chamber.
Development of a Time Projection Chamber Using Gas Electron Multipliers (GEM-TPC) Susumu Oda, H. Hamagaki, K. Ozawa, M. Inuzuka, T. Sakaguchi, T. Isobe,

Development of a Time Projection Chamber Using Gas Electron Multipliers (GEM-TPC) Susumu Oda, H. Hamagaki, K. Ozawa, M. Inuzuka, T. Sakaguchi, T. Isobe,
QGP France 20-23 sept 2010Sanjoy Pal Performances of the tracking Chambers of the ALICE MUON Spectrometer 1.

QGP France sept 2010Sanjoy Pal Performances of the tracking Chambers of the ALICE MUON Spectrometer 1.
High p T - workshop in Jyväskylä - P. Christiansen (Lund) 27.3-2007 1/24 PID at high p T with the ALICE TPC The ALICE experiment –The ALICE TPC Motivation.

High p T - workshop in Jyväskylä - P. Christiansen (Lund) /24 PID at high p T with the ALICE TPC The ALICE experiment –The ALICE TPC Motivation.
June 22, 2009 P. Colas - Analysis meeting 1 D. Attié, P. Colas, M. Dixit, Yun-Ha Shin (Carleton and Saclay) Analysis of Micromegas Large Prototype data.

June 22, 2009 P. Colas - Analysis meeting 1 D. Attié, P. Colas, M. Dixit, Yun-Ha Shin (Carleton and Saclay) Analysis of Micromegas Large Prototype data.
TPC in Heavy Ion Experiments Jørgen A. Lien, Høgskolen i Bergen and Universitetet i Bergen, Norway for the ALICE Collaboration. Outlook: Presenting some.

TPC in Heavy Ion Experiments Jørgen A. Lien, Høgskolen i Bergen and Universitetet i Bergen, Norway for the ALICE Collaboration. Outlook: Presenting some.

Similar presentations

Ads by Google