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High Pressure Electroluminescent TPC studies @ CIEMAT/IFAE

High Pressure Electroluminescent TPC studies @ CIEMAT/IFAE. Roberto Santorelli On behalf of I. Gil- Botella , E. Calvo , S. Jimenez Cabre , C. Palomares , A. Verdugo (CIEMAT-MADRID)

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High Pressure Electroluminescent TPC studies @ CIEMAT/IFAE

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  1. High Pressure Electroluminescent TPCstudies @ CIEMAT/IFAE Roberto Santorelli On behalf of I. Gil-Botella, E. Calvo, S. Jimenez Cabre, C. Palomares, A. Verdugo (CIEMAT-MADRID) O. Ballester, A. Garica-Soto, J. Illa, A. Lostao-Viñolas, T.Lux, F. Sanchez (IFAE-Barcelona) Advances in Neutrino Technology 2013, May 9-12 Lake Tahoe

  2. General concept • Electroluminescence (EL) detectors have a wide range of applications • Several gas TPCs (both Ar and Xe researches) have been developed in a joint R&D activity by CIEMAT (Madrid) and IFAE (Barcelona) • (Ar and Xe scintillation studies…) • Main research line: medium size (110x200 mm) High-PressureGas Xe TPC with 25 APDs • Combined energy resolution and tracking studies R.Santorelli - ANT 2013, May 12 Lake Tahoe

  3. Example I: simple setup for QE studies (GXe) 241Am R.Santorelli - ANT 2013, May 12 Lake Tahoe

  4. EL signal R.Santorelli - ANT 2013, May 12 Lake Tahoe

  5. Example II: small EL-TPC for spectroscopy studies (GAr) UV1 VIS1 VIS2 VUV1 UV2 UV IR VIS VUV R.Santorelli - ANT 2013, May 12 Lake Tahoe

  6. EPL, 91 (2010) 62002 GAr LAr R.Santorelli - ANT 2013, May 12 Lake Tahoe

  7. EL signals Va=1.5 kV , Vk=0 Va=2.5 kV , Vk=0 Va=3.0 kV , Vk=0 Va=3.0 kV , Vk=3.0 kV R.Santorelli - ANT 2013, May 12 Lake Tahoe

  8. Main R&D activity • Excellent performances of the gas TPCs in respect of energy resolution have been proved • Limited knowledge about their tracking capabilities on larger scale • Study of an APD readout for EL detectors • Goal: Good energy resolution and investigation of possible tracking capabilities at the same time R.Santorelli - ANT 2013, May 12 Lake Tahoe

  9. Experimental Setup HP TPC (30 cm long, 30 diameter) HV power supplies (20 and 35 kV) Preamp, ADC, APD power supply Cosmic ray trigger Xenon recovery system Getter PMT power supply Vacuum pump system R.Santorelli - ANT 2013, May 12 Lake Tahoe

  10. “CIFA” chamber 7 mm 110 mm 200 mm R.Santorelli - ANT 2013, May 12 Lake Tahoe

  11. R.Santorelli - ANT 2013, May 12 Lake Tahoe

  12. Readout array • Array of 5x5 S8664-SPL APDs from Hamamatsu (5x5 mm2) powered independently • Pitch 15 mm • 2 PMTs for t0 measurements • 3 custom made preamp/shaper boards • V1740 CAEN ADC for digitization • DAQ based on Midas R.Santorelli - ANT 2013, May 12 Lake Tahoe

  13. Previous Studies • Small HP chamber with 5 APDs • All APDs at the same voltage • Allowed to develop readout electronics • Excellent energy resolution achieved xenon (8.2 ± 0.1)% FWHM J.Phys.Conf.Ser.309, pp. 012008.2011 R.Santorelli - ANT 2013, May 12 Lake Tahoe

  14. Vertex Distribution • Am-241 X-ray source (installed at the center of the cathode) • Pressure: 2 bar • Drift field: 200 V/cm/bar • EL field: 4.5 kV/cm/bar • Likelihood fit using light profile model for energy and position reconstruction R.Santorelli - ANT 2013, May 12 Lake Tahoe

  15. First Results: Energy Resolution 13.9+17.8+20.8 keV Maximum signal in one of the 9 APDs in the center Signal summed over 24 APDs No correction yet for drift/diffusion, attachment…etc  Room for improvement 26.4+30 keV 8.7 FWHM @ 59.5 keV 59.5 keV A.U. R.Santorelli - ANT 2013, May 12 Lake Tahoe

  16. First Results: Energy Resolution 8.2 FWHM @ 59.5 keV A.U. Maximum signal in the central APD R.Santorelli - ANT 2013, May 12 Lake Tahoe

  17. INTERCALIBRATION • Problems: • APDs gain very sensitive to the temperature and the voltage. • The set up makes challenging to calibrate the APDs one by one. • Solution: • Intercalibration based on the positionsimmetry • Key point  Use symmetry in light deposition around the maximum: • It quantify the difference of energy between APDi and APDj when the maximum signal is in the one between them. • 59.5 keVX-ray peak of 241Am used. R.Santorelli - ANT 2013, May 12 Lake Tahoe

  18. For events where the energy deposition in the middle APD is maximum, Aij should be 0 (assuming a symmetric EL shower). • Due to different APD gains this Aij≠0. • Correct these Ei and Ej using a calibration factor to avoid this problem. where After calibration: • This αij should tend to one and A’ij to zero after calibration is done. R.Santorelli - ANT 2013, May 12 Lake Tahoe

  19. Assymetry before calibration: Assymetry after calibration: A’ij tends to zero. Behavior of some of the alpha coeficients during calibration steps: Clear tendency of α to 1 R.Santorelli - ANT 2013, May 12 Lake Tahoe

  20. INTERCALIBRATION: Preliminary results 242Am spectrum (when the energy deposition is maximum in one of the 9 central APDs): No calibration: Calibration (1st iteration): Calibration (2nd iteration): RE=13.12% RE=9.35% RE=9.04% The intercalibration process improves the resolution as we expected. R.Santorelli - ANT 2013, May 12 Lake Tahoe

  21. First Results: Parameter Scan R.Santorelli - ANT 2013, May 12 Lake Tahoe

  22. First Results: Tracking • Cosmic rays trigger • Very primitive cluster finder R.Santorelli - ANT 2013, May 12 Lake Tahoe

  23. First Results: T0 • Possible to vary drift distance • t between external trigger and signal arrival allows to estimate drift velocity • vd= ~0.17 cm/us (theory: 0.1 cm/us) • Probably N2 impurity • Clear peak in both PMTs at t≈0 Sum of all waveforms over all events PMT UP PMT DOWN • Peak in the sum of all APDs •  Can we see this on event by event basis??? Sum APDs t [s] R.Santorelli - ANT 2013, May 12 Lake Tahoe

  24. Summary and Outlook • Different EL-TPCs built in collaboration between CIEMAT and IFAE • EL-TPC with 25 APDs for high pressure XE-gas studies in operation • Energy resolution 8.2% @ 60 keV (room for improvements) • Preliminary track reconstruction proved • Study for t0 detection on going R.Santorelli - ANT 2013, May 12 Lake Tahoe

  25. CIEMAT LAr lab • 450 liters liquid nitrogen dewar. • 2 cryostats of 70 liters each, high vacuum graded, for liquid argon. • Turbomolecular pump for high vacuum.

  26. Vis2 Vis1 UV2 UV1 Pe/25 R.Santorelli - ANT 2013, May 12 Lake Tahoe

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