The MicroBooNE LArTPC Sarah Lockwitz, FNAL 2013 DPF August 15, 2013 MicroBooNE is a LAr TPC • A liquid argon (LAr) time-projection chamber (TPC) NuMI Beam Wilson Hall • It will be placed in the Booster Neutrino beam at Fermilab Booster • It has both physics and R&D goals: Booster Neutrino Beam • Physics: High-statistics measurements of ν’s on Ar Tevatron • Investigate MiniBooNE’s low- energy excess • R&D: Gain experience building & operating a LArTPC Main Injector • Will put a near featured efforts DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 2 MicroBooNE is a LAr TPC • A liquid argon (LAr) time-projection chamber (TPC) NuMI Beam Wilson Hall • It will be placed in the Booster Neutrino beam at Fermilab Booster • It has both physics and R&D goals: Booster Neutrino Beam • Physics: High-statistics measurements of ν’s on Ar B. Carls talk will Tevatron • Investigate MiniBooNE’sfocus on this low- energy excess • R&D: Gain experience building & operating a LArTPC Main Injector • Will put a near featured efforts DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 2 MicroBooNE is a LArTPC DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 3 MicroBooNE is a LArTPC • LArTPCs have great imaging potential DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 3 MicroBooNE is a LArTPC • LArTPCs have great imaging potential • MINOS event display: DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 3 MicroBooNE is a LArTPC • LArTPCs have great imaging potential • MINOS event display: νe Interaction • MiniBooNE event display: DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 3 MicroBooNE is a LArTPC • LArTPCs have great imaging potential • MINOS event display: νe Interaction • MiniBooNE event display: • T2K event display: http://t2k-experiment.org From T2K, From DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 3 MicroBooNE is a LArTPC 200 300 400 500 600 700 • LArTPCs have great imaging 2200 potential 2000 1800 1600 • MINOS event display: 1400 νe Interaction 1200 300 350 400 450 500 550 600 650 • MiniBooNE event display: 2200 2000 • T2K event display: 1800 1600 1400 2200 • MicroBooNE: 2000 1800 http://t2k-experiment.org 1600 1400 500 600 700 800 900 1000 40 - T2K, From e [2.0 GeV/c] + Ar e [1.3 GeV/c] + p [0.7 GeV/c] + p [0.9 GeV/c] + X2000000101 + X2000000101 1 LArSoft 0.8 q [ADC] Run: 1/0 0.6 Event: 4 0.4 Monte Carlo UTC Thu Jan 1, 1970 0.2 00:00:0.020000000 0 0 500 1000 1500 2000 2500 3000 t [ticks] DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 3 Liquid Argon Work at Fermilab Materials/ Electronics Test LAPD Multikiloton Stand LAr detector 2008 2014 LBNE • Cryostat – 150’’ ID x 40 ft long x 7/16’’ 100% 100% R&D thick; weighs about 70,000 lbs – Full Vacuum – 30 psig Physics – About 35,000 gal. Liquid Argon – Insulated by 16’’ Closed Cell Spray Heat load calcs performed by Glenn Morgan on Polyurethane 2007 – Supported2010 by 2 High Density (12- ????? 15 pcf) Polyurethane Saddles – Ribbed design Cryostat at DZero MicroBooNE ArgoNeuT (also LArIAT & 35T) DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 4 Liquid Argon Work at FermilabICARUS Pioneering LAr in Europe Materials/ 2001, 2010 Electronics Test LAPD Multikiloton Stand LAr detector 2008 2014 LBNE • Cryostat – 150’’ ID x 40 ft long x 7/16’’ 100% 100% R&D thick; weighs about 70,000 lbs – Full Vacuum – 30 psig Physics – About 35,000 gal. Liquid Argon – Insulated by 16’’ Closed Cell Spray Heat load calcs performed by Glenn Morgan on Polyurethane 2007 – Supported2010 by 2 High Density (12- ????? 15 pcf) Polyurethane Saddles – Ribbed design Cryostat at DZero MicroBooNE ArgoNeuT (also LArIAT & 35T) DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 4 Outline • Reminder of how a TPC works • Why argon? • Design and construction efforts • Frame (+ Cathode & Anode readout) • PMTs • Cryostat & Cryosystem • Status and outlook DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 5 A Time-Projection Chamber Works by... Anode Wire Planes U V Y PMT DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 6 A Time-Projection Chamber Works by... • Energy loss by charged particles → Ionization & excitation of Ar Anode Wire Planes U V Y PMT DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 6 A Time-Projection Chamber Works by... • Energy loss by charged particles → Ionization & excitation of Ar + Anode Wire Planes • Prompt light emission by Ar2* starts clock U V Y PMT t0 DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 6 A Time-Projection Chamber Works by... • Energy loss by charged particles → Ionization & excitation of Ar + Anode Wire Planes • Prompt light emission by Ar2* starts clock U V Y • Electrons drift to the anode (Ar+ ions to the cathode) PMT t0 DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 6 A Time-Projection Chamber Works by... • Energy loss by charged particles → Ionization & excitation of Ar + Anode Wire Planes • Prompt light emission by Ar2* starts clock U V Y • Electrons drift to the anode (Ar+ ions to the cathode) PMT t0 DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 6 A Time-Projection Chamber Works by... • Energy loss by charged particles → Ionization & excitation of Ar + Anode Wire Planes • Prompt light emission by Ar2* starts clock U V Y • Electrons drift to the anode (Ar+ ions to the cathode) • Moving electrons induce currents on wires t0 DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 6 A Time-Projection Chamber Works by... • Energy loss by charged particles → Ionization & excitation of Ar + Anode Wire Planes • Prompt light emission by Ar2* starts clock U V Y • Electrons drift to the anode (Ar+ ions to the cathode) • Moving electrons induce currents on wires t0 DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 6 A Time-Projection Chamber Works by... • Energy loss by charged particles → Ionization & excitation of Ar + Anode Wire Planes • Prompt light emission by Ar2* starts clock U V Y V • Electrons drift to the anode (Ar+ ions to the cathode) • Moving electrons induce currents on wires Y • Tracks are reconstructed from wire signals: • Two dimensions from wires t0 • Drift distance is found from knowing t0 & vd → Time projection! DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 6 MicroBooNE is a LAr TPC — Why LAr? • We need to drift electrons from ionization to sense wires → closed shell • Scintillation light gives us t0 • Need good dielectric properties for HV stability (needed for E field) • Noble elements are a good choice for this: MIP DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 7 MicroBooNE is a LAr TPC — Why LAr? • We need to drift electrons from ionization to sense wires → closed shell • Scintillation light gives us t0 • Need good dielectric properties for HV stability (needed for E field) • Noble elements are a good choice for this: MIP From M. Soderberg From DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 7 MicroBooNE is a LAr TPC — Why LAr? • We need to drift electrons from ionization to sense wires → closed shell • Scintillation light gives us t0 • Need good dielectric properties for HV stability (needed for E field) • Noble elements are a good choice for this: Dense MIP From M. Soderberg From DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 7 MicroBooNE is a LAr TPC — Why LAr? • We need to drift electrons from ionization to sense wires → closed shell • Scintillation light gives us t0 • Need good dielectric properties for HV stability (needed for E field) • Noble elements are a good choice for this: Can be cooled by LN2 MIP From M. Soderberg From DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 7 MicroBooNE is a LAr TPC — Why LAr? • We need to drift electrons from ionization to sense wires → closed shell • Scintillation light gives us t0 • Need good dielectric properties for HV stability (needed for E field) • Noble elements are a good choice for this: ~$10/L ~$2/L ~$3000/L ~$500/L ~$700/L MIP From M. Soderberg From DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 7 Design and Construction: TPC Frame DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 8 Design and Construction: TPC Frame • The TPC frame is a box 2.33 m x 2.56 m x 10.37 m (height, drift width, length) DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 8 Design and Construction: TPC Frame • The TPC frame is a box 2.33 m x 2.56 m x 10.37 m (height, drift width, length) • ~86 T active volume -- Largest LArTPC in America From Wikipedia DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 8 Design and Construction: TPC Frame • The TPC frame is a box 2.33 m x 2.56 m x 10.37 m (height, drift width, length) • ~86 T active volume -- Largest LArTPC in America • We need pure Ar so we use tested materials in the construction • The electric field cage is made from stainless steel tubes • Held parallel by G10 braces From Wikipedia DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 8 Design and Construction: TPC Frame • The TPC frame is a box 2.33 m x 2.56 m x 10.37 m (height, drift width, length) • ~86 T active volume -- Largest LArTPC in America • We need pure Ar so we use tested materials in the construction • The electric field cage is made from stainless steel tubes • Held parallel by G10 braces • We then step down the voltage between each tube to create a uniform electric field From Wikipedia DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 8 Cathode Plane 2.56 m Drift DPF: MicroBooNE TPC S. Lockwitz August 15, 2013 9 Cathode Plane • The cathode plane is made of nine stainless steel sheets: 2.56 m Drift DPF: MicroBooNE TPC S.