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Status and Design Issues of the ILC LCTPC R&D Program

This talk outlines the current status of the International Linear Collider (ILC) and the design issues faced by the Large TPC (LCTPC). It discusses the next steps in the R&D program, including working with small prototypes (SP) and building the large prototype (LP).

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Status and Design Issues of the ILC LCTPC R&D Program

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  1. Status of the ILC, issues for the LCTPC design and their feedback to the R&D program • OUTLINE of TALK • Overview ILC • LCTPC Design Issues in the DODs • Next steps: • More work with Small Prototypes (SP) • Build the Large Prototype (LP) • LCTPC  R&D plans Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  2. LDC/GLD/4th Concepts or A TPC for a Linear Collider Detector Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  3. Formal organization begun at LCWS 05 at Stanford in March 2005 when Barry became director of the GDE The Global Design Effort ACFA’07 Beijing: RDR(+cost), DCR Technically Driven Schedule Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  4. Aug 2004: Technology decision: COLD superconducting à la TESLA chosen International Linear Collider • Baseline: • 200 GeV < √s < 500 GeV • Integrated luminosity ~ 500 fb-1 in 4 years • 80 % e- beam polarisation • Upgrade to 1TeV, L = 1 ab-1 in 3 years • 2 interaction regions • Concurrent running with the LHC from 2015 Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  5. Physics Overview @ Snowmass’05 by Peter Zerwas Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  6. Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  7. Goal: to revisit the Higgs… e.g.with precision measurements of the Higgs Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  8. Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  9. The value of precision measurements… Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  10. Polarization Multipole expansion Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  11. Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  12. Where are we with the Higgs? CERN Courier, Nov 2005 Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  13. Why do we think these indirect, precision meas. are telling us anything??? CERN Courier, Nov 2005 : Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  14. Symmetry between FermionsBosons (Matter) (Force carriers) SUperSYmmetry ...now we have doubled the particle spectrum... Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  15. without Supersymmetry with Supersymmetry 1 TeV Energy in GeV Supersymmetry ... BUT solves several SM problems: • Link to gravity • lightest SUSY particle stable  Dark matter candidate • Solves fine tuning problems • Predicts light Higgs • Unification of forces Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  16. From my talk at the Arlington LC Workshop January 2003: Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  17. Need highest luminosity Precision for 1 ab-1 : Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  18. 10-3 Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  19. ILC 2018 2019 2021 2024 +y 2027 +y 25 Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  20. Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  21. HISTORY 1992:First discussions on detectors in Garmisch-Partenkirschen (LC92).Silicon? Gas? 1996-1997:TESLA Conceptual Design Report. Large wire TPC, 0.7Mchan. 1/2001:TESLA Technical Design Report. Micropattern (GEM, Micromegas) as a baseline, 1.5Mchan. 5/2001:Kick-off of Detector R&D 11/2001:DESY PRC proposal. for TPC R&D (European & North American teams) 2002:UCLC/LCRD proposals 2004: After ITRP, WWS R&D panel Europe Chris Damerell (Rutherford Lab. UK) Jean-Claude Brient (Ecole Polytechnique, France) Wolfgang Lohmann (DESY-Zeuthen, Germany) Asia HongJoo Kim (Korean National U.) Tohru Takeshita (Shinsu U., Japan) Yasuhiro Sugimoto (KEK, Japan) North America Dean Karlen (U Victoria, CAN) Ray Frey (U. of Oregon, USA) Harry Weerts (Fermilab, USA) GOAL To design and build an ultra-high performance Time Projection Chamber …as central tracker for the ILC detector, where excellent vertex, momentum and jet-energy precision are required Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  22. LCTPC/LP Groups (19Sept06) Americas Carleton Montreal Victoria Cornell Indiana LBNL Purdue (observer) Asia Tsinghua CDC: Hiroshima KEK Kinki U Saga Kogakuin Tokyo UA&T U Tokyo U Tsukuba Minadano SU-IIT Europe LAL Orsay IPN Orsay CEA Saclay Aachen Bonn DESY U Hamburg Freiburg MPI-Munich TU Munich (observer) Rostock Siegen NIKHEF Novosibirsk Lund CERN Other groups MIT MIT (LCRD) Temple/Wayne State (UCLC) Yale Karlsruhe UMM Krakow Bucharest Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  23. Large Detector Concept example 3x10-5 Particle Flow .30 (N.B. below are TDR dimensions, which have changed for latest LDC iteration) -5 Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  24. LDC HCal ECal TPC GLD Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  25. Physics determines detector design • momentum: d(1/p) ~ 10-4/GeV(TPC only) ~ 0.6x10-4/GeV(w/vertex) (1/10xLEP) e+e-gZHgllX goal: dMmm <0.1x GZ  dMHdominated by beamstrahlung • tracking efficiency: 99% (overall) excellent and robust tracking efficiency by combining vertex detector and TPC, each with excellent tracking efficiency Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  26. Gaseous Tracking R&D Dan Peterson, Cornell Are TPC’s Good for Tracking? • ZH events • Standalone TPC reconstruction (LD design) Answer: Yes. Next questions: what about resolution, ion feedback, track separation resolution, neutron backgrounds? Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  27. Motivation/Goals • Continuous tracking throughout large volume • ~98% tracking efficiency in presence of backgrounds • Timing to 2 ns together with inner silicon layer • Minimum of X_0 inside Ecal (<3% barrel, <30% endcaps) • σ_pt ~ 100μm (rφ) and ~ 500μm (rz) @ 3,4T for right gas if diffusion limited • 2-track resolution <2mm (rφ) and <5-10mm (rz) • dE/dx resolution <5% • Full precision/efficiency at 30 x estimated backgrounds Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  28. R&D program • gain experience with MPGD-TPCs, compare with wires • study charge transfer properties, minimize ion feedback • measure performance with different B fields and gases • find ways to achieve the desired precision • investigate Si-readout techniques • start electronics design for 1-2 million pads • study design of thin field cage • study design thin endplate: mechanics, electronics, cooling • devise methods for robust performance in high backgrounds • pursue software and simulation developments Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  29. R&D Planning • 1) Demonstration phase • Continue work with small prototypes on mapping out parameter space, understanding resolution, etc, to prove feasibility of an MPGD TPC. For CMOS-based pixel TPC ideas this will include proof-of-principle tests. • 2) Consolidation phase • Build and operate the Large Prototype (LP), Ø ~ 80cm, drift ~ 60cm, with EUDET infrastructure as basis, to test manufacturing techniques for MPGD endplates, fieldcage and electronics. LP design is starting  building and testing will take another ~ 3-4 years. • 3) Design phase • During phase 2, the decision as to which endplate technology to use for the LC TPC would be taken and final design started. Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  30. What have we been doing in Phase 1 ? Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  31. Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  32. S1 Gas-Amplification Systems: Wires & MPGDs GEM: Two copper foils separated by kapton, multiplication takes place in holes, uses 2 or 3 stages Micromegas: micromesh sustained by 50μm pillars, multiplication between anode and mesh, one stage P~140 μm D~60 μm S1/S2 ~ Eamplif / Edrift Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning S2

  33. Pixel TPC Development Freiburg Nikhef Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  34. Examples of Prototype TPCs Carleton, Aachen, Cornell/Purdue,Desy(n.s.) for B=0or1T studies Saclay, Victoria, Desy (fit in 2-5T magnets) Karlsruhe, MPI/Asia, Aachen built test TPCs for magnets (not shown), other groups built small special-study chambers Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  35. Facilities Saclay 2T magnet, cosmics Desy 5T magnet, cosmics, laser Cern test-beam (not shown) EUDET Kek 1.2T, 4GeV hadr.test-beam Desy 1T, 6GeV e- test-beam Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  36. TPC R&D summary to date • Now 4 years of MPGD experience gathered • Gas properties rather well understood • Limit of resolution being understood • Resistive foil charge-spreading demonstrated • CMOS RO demonstrated • Work starting for the Large Prototype Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  37. Phase 2 • Basic Idea: LP should be a prototype for the LC TPC design and test as many of the issues as possible (like, e.g., TPC90 @ Aleph). This will take at least 2 iterations, we call them LP1 and LP2. • The Eudet infrastructure gives us a starting basis for the LP work • The general LCTPC/LP R&D issues and been divided up into workpackages (WP) more later… Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  38. Performance • Momentum precision needed for overall tracking? • Momentum precision needed for the TPC? • Good dE/dx resolution, Vº detection • Requirements for • 2-track resolution (in rφ and z)? • track-gamma separation (in rφ and z)? • Tolerance on the maximum endplate thickness? • Tracking configuration • Calorimeter diameter • TPC • Other tracking detectors • TPC OD/ID/length Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  39. LCTPC resolution in the DODs Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  40. Physics determines detector design • Momentum resolution: d(1/p) ~ ????? e+e-gZHgllX  couplings, dMH? • Redo study at s = 220 GeV and using vertex constraint! BIG ISSUE! Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  41. Prototype ResultsPoint resolution, Gem --Three examples of σ_pt measured for Gems and 2x6mm^2 pads. --First, in Desy chamber (triple Gem), resolution using “triplet method”. --Second, in Victoria chamber (double Gem), unbiased method used: track fit twice, with and without padrow in question, σ determined for each case; geometric mean of the two σ’s gives the correct result. --See next page… B=4T Gas:P5 30cm Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  42. ACFA8--July2005 Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  43. Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  44. Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  45. Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  46. Performance • Momentum precision needed for the TPC • What is the best we can do? Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  47. Keisuke Fujii, PRC report Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  48. Momentum resolution needed… “Club sandwich” possible in GLD because of large size. We will study performance & feasibility of this option in case the momentum precision is required. Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  49. LC TPC Endcaps Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

  50. GLD GLD Akira Sugiyama Ron Settles MPI-Munich TUM Dec 2006 -- ILC, LCTPC Design Issues: R&D Planning

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