Safety and Interest in Pure CH4 vs. Ne/CH4 Mixture at Queen's University Meeting

Explore the safety implications and scientific interest in comparing pure CH4 with a Ne/CH4 mixture at the 6th NEWS-G Collaboration Meeting held at Queen's University. The study delves into background rates, interactions between gases, mass ratios, event rates, signal-to-background ratios, and overall gains in signal-to-background ratio. It also discusses gas exposure, limitations in mixtures and pure forms, safety concerns, exhaust procedures, and calibration methods using 37Ar neutron recoil spectrum.

• Safety
• Research
• Gas Mixture
• Queens University
• Event Rates

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1. Pure CH4 vs Ne/CH4 mixture Interest Safety Gilles Gerbier Queen s University 6th NEWS-G Collaboration meeting 11-13thjune 2019 Grenoble

2. Background rate in mix and pure CH4

3. Interest Consider 2b of Ne/CH4 at 90/10 and 200mb of pure CH4 For same mass of H, avoid interactions on Neon => less background evts/ kg.d of H Input fromAlexis B about evt rate dru in both gas in evts/kg.d.keV voume sph Pressur e b Fraction CH4 0.06 1.00 mass Ne mass CH4 73.911521.38 0.00 164.25 164.25 mass total deltat t d 44.00 20.00 Rate back dru Nevts back/kev Back in ROI 0.1 keV Nevts signal 220.00 1.10 222.22 16.91 Ratio of S/B Exposure H kd.d Gas Ne/CH4 1149.76 CH4 mass H 18.481447.47 41.06 S/B 1.50 0.20 3.00 4.00 200.82 13.14 20.08 1.31 0.81 0.82 1149.76 15.44 Overall gain in S/B of 15 Ie back free limit in mix obtained after 44/20 = 2.2 days for 0.04 kg.d Ie back free limit in pure obtained after 20/1.31 = 15 days for 0.62 kg.d

5. Run in Saclay

6. CH4 safety issues

7. Exhaust First fill with N2 N2, 4765 l 4.4 % CH4 Pump 260 l + 884 l Second empty with input of N2 200 mb CH4 + 680 mb N2 23 % From 100 % to

8. Pros/cons Calibration 37Ar (Multiple fills ? ) Rely on neutron recoil spectrum (E0 of exponential) QF Do high quality data mean true answer ?