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Study of the Central Tracker for Huge Detector at the Linear Collider

Study of the Central Tracker for Huge Detector at the Linear Collider. The 7th ACFA Workshop on Physics & Detector at the Linear Collider 9-12 November 2004, Taipei, Taiwan. Takashi Watanabe Kogakuin University. Contents. Physics Requirements TPC study with MPI TPC (MWPC)

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Study of the Central Tracker for Huge Detector at the Linear Collider

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  1. Study of the Central Trackerfor Huge Detectorat the Linear Collider The 7th ACFA Workshop on Physics & Detector at the Linear Collider 9-12 November 2004, Taipei, Taiwan Takashi Watanabe Kogakuin University

  2. Contents • Physics Requirements • TPC study with MPI TPC (MWPC) • Beam test w/o Magnetic Field • Cosmic-ray test w/o Magnetic Field • GEM performance • Summary The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  3. Europe/Asia TPC collaboration • Europe • MPI • DESY • IPN Orsay • Asia • Chiba University • KEK • Kinki University • Kogakuin University • Mindanao State Univeristy • Saga University • Tokyo University of Agriculture and Technorogy • University of Tokyo • University of Tsukuba The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  4. Conclusions of Last workshop • Most of R&D questions in Proof of Principle phase have been answered affirmatively. This means that original R&D goals are basically achieved. • Next phase is engineering design, which requires a full scale prototype test. or • We will seek for other possibilities . (e.g. TPC) The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  5. Present Situation • ITRP recommends “Cold” Technology (August, 2004) • Basically, requirements for Huge detector from physics are almost same. G • Requirement for Main Tracker • Good recoil mass resolution • Good jet invariant mass resolution • Time stamping The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  6. Recoil Mass Resolution The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  7. Jet Invariant Mass Resolution • Good track-cluster matching sz@ 1mm • 2-track separation better than 2mm < 10% hit loss at inner most layer for 250GeV W’s B not mentioned in this talk The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  8. Time Stamping Capability The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  9. Present Situation • ITRP recommends “Cold” Technology (August, 2004) • Basically, requirements for Huge detector from physics are almost same. G • Requirement for Main Tracker • Good recoil mass resolution • Good jet invariant mass resolution • Time stamping The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  10. Position Resolution G TPC with micro pattern readout The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  11. TPC R&D item • MPGD sensor must provide better performance than wires do, • but… • We should define base line sensor for TPC using MWPC (for fallback option?) • 2mm spacing with 1mm gap to cathodes • ExB effect should be smaller • Localize induced charge distribution on pads • Dispersion of charge cloud strongly depends on B-fields & drift length Beam test with Magnetic field The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  12. JACCEE magnet (for BESS-II) • No Return Yoke • B = 1~1.2T • @ center The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  13. PS beam line @ KEK PS E391a experiment (KL →p0nn) Magnet excitation was limited only one time about 20m p2 line p-:0.6-4GeV/c p+ p East Counter Hall a few percent effect of magnetic field The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  14. p2 beam line TPC in JACCEE magnet Beam The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  15. wire charge 1mm pad MPI TPC • Detachable endplate • MWPC • MPGD (GEM, mMEGAS) • 2.00mm x 6.00mm readout pads • 32pads x 12 rows • 7padrows equipped • 2mm anode-wire spacing • Small wire angular (ExB) effect • Maximal drift length: 270mm • 1atm Ar:CH4:CO2 (93:5:2) TDR gas • Vdrift = 45mm/ms (Edrift=200V/cm) Field Cage (Vcathod=-6kV) The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  16. JACCEE magnet • No Return Yoke • B = 1~1.2T • @ center The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  17. Electronics • ALEPH based readout electronics • FASTBUS FADC: 80ns time slot • Pre-amplifier: 500ns shaping time The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  18. Typical Event p- B = 1T p = 4GeV/c f = -20deg The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  19. Pad Response Function B = 0T Along z every 10mm Normalized Qi 1 by Kijima 0 Xpad-Xtrack(mm) Slice on x axis obtain the mean fit them With Gaussian to get width The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  20. Parameterization of sPRF consistent by Kijima The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  21. sx as a function of drift distance by Ikematsu preliminary not calibrated not corrected Ne~25!? The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  22. sx as a function of drift distance • CD~0.1mm/sqrt{cm} @ B=3T (D.Karlen’s Cal.&Mes.) sx ~ 280mm @ 2000mm evenif sgeom=0mm • Do calibration and correction • Needs gas study • Study why Ne is small (charge screening?) The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  23. sz as a function of drift distance preliminary not calibrated not corrected • sz<800mm for all drift region by Ikematsu The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  24. Wire Angular (ExB) Eff. sx as a function of track-wire angle w/ B-field 1T by Ikematsu The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  25. Next Step • Cosmic-ray test at the KEK Cryogenic Center The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  26. Cosmic-ray test @ the KEK CC Superconducting magnet with return yoke The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  27. Next Step • Cosmic-ray test at the KEK Cryogenic Center • MWPC (now suspended because of DAQ problems) • 4 layers GEM (from December?) The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  28. GEM • bi-conical holes due to chemical etching( CERN, 3M ) • Copper electrodes • 5um thick • Kapton insulator • CNS@Tokyo univ. + Fuchigami Micro Co. • using Plasma etching -> straight holes • Need Comparison under realistic operation condition !! The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  29. CERN GEM & Fuchigami GEM Photos by microscope • CERN GEM • dark ring around hole shows Kapton insulator • Fuchigami GEM • straight hall The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  30. GEM readout The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  31. GEM beam test • Same time with MPI-TPC w/ MWPC • No Magnetic Field • P-10 gas Test Chamber The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  32. 23.5mm Setup Drift region • VG-G = 2kV/cm • VG-P = 3kV/cm 1.5mm 1.5mm 10MW 1mm GEM 10MW VGEM Readout pads (same with MPI-TPC) 10,30,50MW The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  33. PRF of GEM • Electrons from track (around center of pad) went to only one pad G • 2mm is too large? Pad Response Function Normarized Q xpad-xtrack by Sakamoto The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  34. Next Step • Cosmic-ray test at the KEK Cryogenic Center • MWPC (now suspended because of DAQ problems) • 4 layers GEM (from December?) • Beam test at the KEK-PS Counter Hall (April/May, 2005?) • 4 layers GEM • mMEGAS • Cosmic-ray test with new readout (summer 2005?) The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

  35. Summary • We joined the world TPC club and studied the basic line using MPI-TPC w/ MWPC. • We have a lot of study items for TPC w/ MPGD (but we have no enough time). • We are always waiting your comments and joining to our group. The 7th ACFA Workshop on Physics & Detector at the Linear Collider Takashi Watanabe (Kogakuin University)

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