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Albert Einstein Center for Fundamental Physics

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Presentation on theme: "Albert Einstein Center for Fundamental Physics"— Presentation transcript:

1 Albert Einstein Center for Fundamental Physics
Laboratory for High Energy Physics University of Bern employees ARGONTUBE WG: Prof. A. Ereditato, Prof. S. Janos, PD Dr. I. Kreslo, PD Dr. M. Weber, Dr. S. Haug, Dr. C.-C. Hsu, Dr. T. Strauss, S. Delaquis, C. Rudolf von Rohr, M. Zeller Mechanical workshop support: R. Haenni, J.Cristen, F. Nyddeger, J-M. Vuilleumier Electronics lab: P. Lutz, C. Tognina IT support : Dr. G. Sciacca, L. Martinez

2 LAr TPC R&D at LHEP: Micro TPC: fiducial volume 3l Argon volume 4l
Dewar with the outer bath R&D on HV, new charge readout principles and techniques R&D on solid Argon TPC 30 kV coaxial vacuum-tight feed-through for operation at cryogenic temperatures. JINST 5 (2010) T11002.

3 LAr TPC R&D at LHEP: Small TPC: fiducial volume 200 cm3
Argon volume 40l GRNA radiography for Homeland security Applications : TPC with LAr+N Study of ionization signals in a liquid Argon TPC doped with Nitrogen. JINST 3 (2008) P10002 Ionization signals from electrons and alpha-particles in mixtures of liquid Argon and Nitrogen: Perspectives on protons for Gamma Resonant Nuclear Absorption applications. JINST 5 (2010) P10009

4 LAr TPC R&D at LHEP: Medium TPC: fiducial volume <10 l
Argon volume 60 l A Prototype liquid Argon Time Projection Chamber for the study of UV laser multi-photonic ionization. JINST 4 (2009) P07011 Measurement of the two-photon absorption cross-section of liquid argon with a time projection chamber. New J.Phys. 12 (2010)

5 LAr purity measurements with UV laser
CCD Camera Nd-YAG laser Photo diode Z Coordinate Z=t x Read-out plane t E1= 1 kV/cm 64 wires each plane t x Drift time

6 LAr TPC R&D at LHEP: ARGONTUBE: fiducial volume 200 l, total Argon volume 2000 l Key R&D issues: L= 5m charge drift O(ms) charge lifetime (measured with the laser) Liquid purification system with 300 l/h flux capability. Charge diffusion and its effect on spatial resolution 0.5 MV immersed distributed Greinacher HV generator

7 16h after recirculation start, HV=150kV
ARGONTUBE 1st RUN December 2011 16h after recirculation start, HV=150kV

8 ARGONTUBE summary or first run results
Purity better than 0.15 ppb for a lifetime ~ 2 ms achieved Tracks > 4 m long observed above noise level ~5000 cosmic events recorded – beautiful collection!

9

10 Possible contribution to MicroBooNe
UV Laser system for precise purity measurements Immersed distributed HV generator (Greinacher) Liquid recirculation/purification system 300l/h Design of cold electronics Calibration + Beam tests Our expectation: exploit our R&D results in a neutrino beam experiment People: Senior staff: Prof. A. Ereditato, PD Dr. M. Weber, PD Dr. I. Kreslo + 1 PostDoc + 1 PhD student – when required

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