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ILC-TPC Grand Prototype et R&D bulk résistif

ILC-TPC Grand Prototype et R&D bulk résistif. P. Colas. Tests en faisceau au Japon (suite et fin) Test anode resistive à DESY à B=5T Nouvelles de LC-TPC Grand prototype Projet (ANR?) RESIST Vieillissement DHCAL CSTS SPP 29 juin EUDET TimePix, Ingrid, etc… (David).

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ILC-TPC Grand Prototype et R&D bulk résistif

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  1. ILC-TPC Grand Prototype et R&D bulk résistif P. Colas P. Colas - R&D ILC-TPC

  2. Tests en faisceau au Japon (suite et fin) • Test anode resistive à DESY à B=5T • Nouvelles de LC-TPC • Grand prototype • Projet (ANR?) RESIST • Vieillissement • DHCAL • CSTS SPP 29 juin • EUDET TimePix, Ingrid, etc… (David) P. Colas - R&D ILC-TPC

  3. Laboratoire d’Actions Intégrées FJPPL France-Japon • Kinki U. • Y. Kato • T. Yazu • K. Hiramatsu • Hiroshima U. • T. Takahashi • Tokyo TUAT • M. Bitou • (M. Habu) • (K. Nakamura) • O. Nitoh • H. Ohta • K. Sakai • Kogakuin • T. Watanabe • JAPON • KEK/IPNS • K. Fujii • M. Kobayashi • H. Kuroiwa • T. Matsuda • R. Yonamine • Saga • A. Aoza • (H. Fujishima) • T. Higashi • A. Ishikawa • A. Sugiyama • H. Tsuji • FRANCE • CEA/Dapnia Saclay • (D. Burke) • M. Chefdeville • P. Colas • A. Giganon • I. Giomataris • M. Riallot • F. Sénée • S. Turnbull • CNRS/IN2P3 Orsay • V. Lepeltier (LAL) • Ph. Rosier (IPN) • T. Zerguerras (IPN) P. Colas - R&D ILC-TPC

  4. Tests en faisceaux en juin et octobre 2005, tests cosmiques en 2006, participation au MPGD workshop à Saga et au FJPPL en 2007 Réunion endplate large prototype Paris septembre2006 P. Colas - R&D ILC-TPC

  5. Analyse du test en faisceau de juin2005 Avril-mai 2006 : 2 méthodes / programmes indépendants P. Colas - R&D ILC-TPC

  6. Mesure de résolution à B=0.5 et 1T P. Colas - R&D ILC-TPC

  7. P. Colas - R&D ILC-TPC

  8. Taking the finite pad width into account, K. Fujii derived a fully analytic formula for the resolution P. Colas - R&D ILC-TPC

  9. Scaling 1/√12 (use dimensionless quantities scaled by the pad width w) The resolution dependence on z has two regimes: At large z the asymptotic behaviour follows the diffusion limit At low z the effect of finite pad size dominates. For typical values of Neff, the optimal resolution is about 10% of the pad size. 1/√(12.Neff) P. Colas - R&D ILC-TPC

  10. Achievements KEK test beam Micromegas with resistive foil With charge spreading, the resolution was measured to be 50 microns at low z (and at all z for large enough B field) P. Colas - R&D ILC-TPC

  11. Extrapolation à la TPC de l’ILC Conclusion: même avec un pas de 1mm, Micromegas avec des pads standard would ne permettrait pas d’atteindre le but de 130 mm de résolution. Cependant avec une feuille résisitive et des pads de 2.3 mm, ce but est largement atteint (courbe rouge). P. Colas - R&D ILC-TPC

  12. LC-TPC Montage de la collaboration. Collaboration board, Technical board. Memorandum of Agreement en cours de rédaction Infrastructure procurée par EUDET (Aimant PCMAG de KEK, Electronique ALTRO (PASA modifié sans shaping)). Dan Peterson a reçu un bulk fabriqué à Saclay (A. Giganon, S. Aune) et présenté les résultats à LCWS07 à DESY. P. Colas - R&D ILC-TPC

  13. Large Prototype panels D. Peterson, Cornell f = 80cm Franck Senée, Marc Riallot Panneaux prêts fin 2007, tests cosmiques à partir de janvier 2008, faisceau été 2008. Electronique AFTER? Techno: Bulk résistif Trigger : SiPM Saga GEM prototype panel (3700 channels) P. Colas - R&D ILC-TPC

  14. The ideal enplate (dreams…) Electronics side Detector side Credit-card-like integrated electronics Resistive bulk Optical link 1000 l.p.i. Nanocrystalline copper mesh, or gold mesh Low-mass cooling Res. foil grounding on the side Each yellow item is a R&D topic P. Colas - R&D ILC-TPC

  15. P. Colas - R&D ILC-TPC

  16. The Carleton chamber Carleton-Saclay Micromegas endplate with resistive anode. 128 pads (126 2mmx6mm in 7 rows plus 2 large trigger pads) Drift length: 15.7 cm ALEPH preamps + 200 MHz digitizers P. Colas - R&D ILC-TPC

  17. A point charge being deposited at t=0, r=0, the charge density at (r,t) is a solution of the 2D telegraph equation. Only one parameter, RC (time per unit surface), links spread in space with time. R~1 MW/□ and C~1pF per pad area matches µs signal duration. (r) Q (r,t) integral over pads mm ns P. Colas - R&D ILC-TPC

  18. Reminder of past results • Demonstration with GEM + C-loaded kapton in a X-ray collimated source (M.S.Dixit et.al., Nucl. Instrum. Methods A518 (2004) 721) • Demonstration with Micromegas + C-loaded kapton in a X-ray collimated source (unpublished) • Cosmic-ray test with GEM + C-loaded kapton (K. Boudjemline et.al., to appear in NIM) • Cosmic-ray test with Micromegas + AlSi cermet (A. Bellerive et al., in Proc. of LCWS 2005, Stanford) • Beam test and cosmic-ray test in B=1T at KEK, October 2005 P. Colas - R&D ILC-TPC

  19. The 5T cosmic-ray test at DESY 4 weeks of data taking (thanks to DESY and T. Behnke et al.) Used 2 gas mixtures: Ar+5% isobutane (easy gas, for reference) Ar+3% CF4+2% isobutane (so-called T2K gas, good trade-off for safety, velocity, large wt ) Most data taken at 5 T (highest field) and 0.5 T (low enough field to check the effect of diffusion) Note: same foil used since more than a year. Still works perfectly. Was ~2 weeks at T=55°C in the magnet: no damage P. Colas - R&D ILC-TPC

  20. The gain is independent of the magnetic field until 5T within 0.5% P. Colas - R&D ILC-TPC

  21. Analysis: Curved track fit P>2 GeV f < 0.05 Ar+5% isobutane B=5 T • Resolution = 50 µ independent of the drift distance P. Colas - R&D ILC-TPC

  22. Resolution = 50 µ independent of the drift distance ‘T2K gas’ P. Colas - R&D ILC-TPC

  23. Average residual vs x position Before bias correction After bias correction ±20 m P. Colas - R&D ILC-TPC

  24. Gain = 2300 Gain = 4700 • B=0.5 T • Resolution at 0 distance ~50 µ even at low gain Neff=28.8±2.2 Neff=25.2±2.1 At 4 T with this gas, the point resol° is better than 80 µm at z=2m Even higher B fields possible : new concept? P. Colas - R&D ILC-TPC

  25. Résisitif • Arrivée de Stephen Turnbull en Septembre • Travail sur MC, tests T2K au CERN • ANR RESIST: 12 personnes+1 postdoc+ST • Tests en labo: bulk résistif, mesures de résistivité, uniformité, etc… • Tests en faisceau ou cosmique au CERN et/ou TRIUMF ou Fermilab P. Colas - R&D ILC-TPC

  26. CONCLUSION • Bonne compréhension des gaz, de la résolution • Démonstration de l’efficacité de la feuille résistive : 50 microns partout • Confiance pour le vieillissement des bulks sous gaz pour T2K. Néanmoins à confirmer par des études longues et systématiques • Démarrage du Large Prototype • Nécessité de développer le bulk résistif P. Colas - R&D ILC-TPC

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