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100 tons of LAr (Liquid Argon) Detectors T2K (Tokai 2 Kamiokande) (2km from accelerator)

R&D for liquid Argon TPC detectors for Neutrino and astroparticle experiments. F ~ 70 m. X00km. 295km. 2km. 100 ktons Liquid Argon TPC (Time Projection Chamber) for Astro particle Physics T2K second phase CP violation? LAGUNA: proton decay. 100 tons of LAr (Liquid Argon)

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100 tons of LAr (Liquid Argon) Detectors T2K (Tokai 2 Kamiokande) (2km from accelerator)

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  1. R&D for liquid Argon TPC detectors for Neutrino and astroparticle experiments F ~ 70 m X00km 295km 2km 100 ktons Liquid Argon TPC (Time Projection Chamber) for Astro particle Physics T2K second phase CP violation? LAGUNA: proton decay 100 tons of LAr (Liquid Argon) Detectors T2K (Tokai 2 Kamiokande) (2km from accelerator) 2020 ? T2K phase II, LAGUNA, 100 Ktons LAr, 100 000 channels or more

  2. Electronic choices due to the detector principle ne QE • Detection with a system of wires of primary ionization drifted in ultra-pure LAr by induction or collection, at minimum ~ 18000 electrons per channel • No charge amplification at the level of the detector  low noise preamp • 400 ns sampling to reconstruct the drift time and the amount of charge • 3D image reconstruction with several planes of wires + drift time • Multichannel 3fC to 120fC (0.5μs pulse) pre-amplifier • 1000 e- ENC with 250pF Detector capacitance • Able to work in LAr vapours @ -150°C with very few power dissipation

  3. Test setup in Liquid Nitrogen N2 @ 77K Qin Vin Vout Qnoise en Vnoise en Cinj CD Cpa(A+1) externalshaper Pre-Amplifier Detector H -A CD 250pF Cpa Rpa τ= [20ns - 1s] -A • 8100μ/0.35μ input transistor T1.4 supplied by 10 mA • In-between phase margin compensation Equivalence without Rpa

  4. Inside PATOP test chip 350Ω : compensation resistance 5pF : compensation capacitance 1/81 pattern of the input trans. Half of the cascode trans.

  5. Two Test chip versions • TOPEST expected for mid-july 2008 • PATOP received in October 2007 AMS 0.35µ PA shaper buffer biasing circuit

  6. Test setup in Liquid Nitrogen N2 @ 77K

  7. Typical 3fC input charge signal externalshaper Pre-Amplifier H -A CD 250pF Cpa Rpa τ= [5ns - 1s] ,q=1.6 10-19 Vnoise Vpeak

  8. Performances for various temperatures externalshaper Qin Vin Vout Qnoise en Vnoise H en Cinj CD Cpa(A+1) τ= [5ns - 1s] -A Shaping time [5ns-1000ns] Vpeak Vnoise ENC 2MΩ 20MΩ - Ambient ~30°C - Vapour~ -110°C - LN2 : 77K

  9. Powered with 3V battery supply Vpeak Vnoise ENC No more noise (sdev) increasing for 20MΩ channel, its shows a lack of power supply decoupling. - Ambient ~30°C - LN2 : 77K

  10. Noise performance in temperature • The noise target that we expect is 1000 e-, considering an input capacitance of 250pF • Due to decoupling weakness, the ENC is not as low as expected. • Theoretical vs. Experimental • ENC table for various temperature with or without shaper for 2MΩ and 20MΩ channels

  11. Resistance for various temperature Measured Using a QuadTech 7600 RLC meter Rpolyhc 2MΩ ambiant to -196°C Rpoly2 350Ω ambiant to -196°C

  12. Threshold voltage NMOS Wtot=199.8μ, L=0.7μ, ngate=9 PMOS Wtot=100μ, L=0.35μ, ngate=10 Vth

  13. members • LAr R&D electronics IPNL for T2K and Astroparticle Physics : • D. Autiero, E. Bechetoille, B.Carlus, S. Gardien, C.Girerd, J. Marteau, H.Mathez • In collaboration with ETHZ and Bern groups Thank you !

  14. Appendix

  15. SMD Capacitances mounted on PCB Power supply Decoupling : 10μF X5R oxyde Substitute detector capacitance : 250pF COG oxyde +30°C; -110°C; -194 +30°C -194

  16. Quadtech RLC measures of SMD tested in LN2

  17. Dynamic measures Measures last ⋍ 2 minutes PMOS test from 0 to 3.3 => starts with high current • NMOS test from 0 to 3.3 • starts with small currents • Progressive warming

  18. ENC as a function of Cdet ENC = 620.4 + 7.5 * Cdet; 20M_30_0uENC = 510.4 + 6.2 * Cdet; 20M_-100_0uENC = 438.6 + 6.9 * Cdet; 20M_-200_0u ENC = 257.1 + 7.2 * Cdet; 20M_30_1uENC = 255.5 + 5.1 * Cdet; 20M_-100_1uENC = 252.1 + 5.1 * Cdet; 20M_-200_1u ENC = 262.0 + 14.8 * Cdet; 2M_30_0uENC = 513.2 + 8.3 * Cdet; 2M_-100_0uENC = 512.8 + 9.1 * Cdet; 2M_-200_0u ENC = 426.1 + 5.0 * Cdet; 2M_30_1uENC = 318.2 + 3.9 * Cdet; 2M_-100_1uENC = 248.2 + 4.4 * Cdet; 2M_-200_1u

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