1. Xe-TMA update ANDRÉ CORTEZ Laboratory of Instrumentation and Experimental Particle Physics (LIP-Coimbra) Physics Department University of Coimbra Coimbra, Portugal RD51 Collaboration – Mini-week CERN, 7-9 December 2015

2. Outline  Xenon  TMA  TMA absorption of Xenon Scintillation  Xe-TMA experimental results RD51 Collaboration – Mini-week

3. Ion Mobility Measurement at LIP Coimbra E/N=20 Td 7,992 Torr V GEM =16 V E/N=20 Td 7,992 Torr V GEM =16 V K 01 ~ 0,637 cm 2 V -1 s -1 Xe 2 + P. Neves, C.A. N. Conde and L.M.N Távora RD51 Collaboration – Mini-week Experimental Results: Xe

4. E/N=35 Td 1,004 Torr V GEM =36 V E/N=35 Td 1,004 Torr V GEM =36 V Not in Steady State Regime The reduced mobility has a strong dependence of the field for pressures above 3 Torr It’s not possible to observed any peak in pure TMA for pressures above 3 torr or for low voltages in the GEM E/N=35 Td 2,992 Torr V GEM =36 V E/N=35 Td 2,992 Torr V GEM =36 V Ion Mobility Measurement at LIP Coimbra K 0 =0.567±0,013 cm 2 V -1 s -1 Ionization Potential 7,8 – 9,4 eV RD51 Collaboration – Mini-week Experimental Results: TMA

5. Xenon Flash Lamp Absortion 170 nm TMA CsI Photocathode Fluorescent Excitation ≈ 235 nm Low quantum efficiency for 235 nm Ion Mobility Measurement at LIP Coimbra RD51 Collaboration – Mini-week Experimental Results: TMA

6. TMA absorption of Xe scintillation PMT Gas Chamber Xe Lamp G1 – Scintillation field grid G1 Xe/TMA Experimental Apparatus Filter Wavelength-Shifting Property of TMA See Nakajima paper [arXiv:1511.02257v1] RD51 Collaboration – Mini-week

7. TMA absorption of Xe scintillation PMT Xe Lamp G1 – Scintillation field grid G1 Xe/TMA Experimental Apparatus Filter Transmittance of the filter used EO U-330 UV – bandpass filter TMA Absorbs Xe Scintillation; Does not re-emit light; Transmission depends on the amount of TMA and not in the relative abundance; No signal observed for TMA pressure of 3 Torr. RD51 Collaboration – Mini-week

8. Experimental Results: Xe- TMA RD51 Collaboration – Mini-week

9. Ion Mobility Measurement at LIP Coimbra Interesting results There is an increase in reduced mobility K 0 (Preliminary Results) There is an increase in reduced mobility K 0 (Preliminary Results) Discharges For the same fields does not occur for pure TMA or pure Xe. Seems to have a dependence with the relative amounts of TMA in the mixture. Discharges For the same fields does not occur for pure TMA or pure Xe. Seems to have a dependence with the relative amounts of TMA in the mixture. The results obtained for TMA will be presented in NEXT- Experiment Collaboration Meeting in 6th and 7th of November RD51 Collaboration – Mini-week Experimental Results: Xe-TMA

10. Thank you! RD51 Collaboration – Mini-week