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HV Supply and Preamplifier Noise in Pure He: New Print Gas Regulation, DC Tightness, and He-C2H6 Ratio

This project aims to optimize the HV supply and preamplifier noise in pure He gas by implementing a new print with improved gas regulation, DC tightness, and He-C2H6 ratio. It also focuses on protecting the system, calibrating the DC channels, and optimizing the ramping capabilities. Additionally, the project involves improving the noise behavior, evaluating the performance of different components, and enhancing the overall stability and reproducibility of the system.

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HV Supply and Preamplifier Noise in Pure He: New Print Gas Regulation, DC Tightness, and He-C2H6 Ratio

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  1. MEG DC • HV supply preamplifier noise and DRS Input attenuation • protection in pure Henew print • gas regulation, DC tightness, He-C2H6 ratio • N bag • Calibration • schedule DC_status,Je

  2. Capacitors +DC charge loading Recovery, isolators polarizing time HV supply < 100 V oscillations  OK 8 x 2 channels for dec-run Tests Noise – filter Optimize ramping DC_status

  3. s of 400 first DRS channels [mV] Anode number preamplifier noise and DRS Input attenuation For physical big pulse Ratio e+/big pulse const For « edge » big pulse At least rate increas with HV sqrt([6 V on]2 - [6 V off]2) DC_status

  4. DC Current-slit behavior OK Noise important Max current at 1700 V : ~5 mA May be 1780 necessary (first run 2000 V : 60 mA) DC_status

  5. Noise • Much larger than in lab • Much larger than first measurement in PE5 • Fast contribution (see Matthias) already found in HV supply as used in December 2007 run • « slow » component { 1-2 ms) needs more work DC_status

  6. protection in pure He Capacitors, edges, resistance in pure He (< 2% impurities) Imbed elements in Araldit, stable homogenous no temperature effect < 65 0 Threebond white and grey , needs humidity temperature effects already at 55 0 Edges better with next print DC_status

  7. new print Increase distance Carbon frame to HV lines,not to suffer from Threebond „bad“ isolator properties  3 layers with wenn possible HV line in the middle layer Near wing frame, protection longer DC_status

  8. Pressure sensors S1 S2 DC‘s Flux out Flux in Dp/(Flux in+ Flux out) [Pa/(cc/min)] [Pa] [Pa] gas regulation and DC tightness Dpf Dp manifold Consistency Dp/(Flux in+ Flux out) constant Dpf << Dp (S1+S2)/2 DC_status

  9. 12 min Ln Dp 8 DC connected to manifolds Stabilize at or Ok if not (not consistent with viscosity air-He) Flux out (with Flux in = 50 cc/min) (S1+S2)/2 DC‘s Tightness 4 good 2 not so good 2 bad DC_status

  10. C2H6 If diffusion 1/180 negligible If leak ½ .36 cc/min He .09 p/min 16DC,.5 atm  .72 cc/min 40 cc/min  2 % Diffusion of He through Mylar 12 mm 1/2 atm 16x1450 cm2 4.6 cc/min DC_status

  11. He-C2H6 Ratio dependence 1850 V 43% He, 50% He, 55.6% He .79 1.03 1.3  < 2 % stability, reproducibility DC_status

  12. Sensor of He fraction in He-C2H6 mixture • Gas system in Lab • Understand and calibrate system perfectly • Calibration of He content sensor orbetter suited sensor DC_status

  13. 4 • Cable duct  radius – 2 to 3 mm • Modify shape of C – supports  2.5 mm • adapt new manifold to 1) DC_status

  14. Calibration methods • lab aquarium ( DRS + cables for 2 DC) • Mn54 triggered ( 5.9 keV,835 keV photo peak) • Sr90 triggered (< 2 MeV b) • Cosmic m triggered • Lab support ( DRS + cables for 2 DC) (check all channels correctly connected and correlated anode up, anode down, cathodes) • Mn54 triggered (for the temporarily outer DC) • Sr90 not triggered • Cosmic m (triggered ? , complicated) • COBRA (not closed)(check all channels correctly connected and correlatedanode up, anode down, cathodes) • Sr90 not triggered • Cosmic m triggered DC NaI DC DC_status

  15. Tokio Scintillators Cosmic m COBRA Xe NaI DC DC_status

  16. Schedule beginning 2007 „N bag“ DC_status

  17. New anodes  largest time consumer (production rate known) Adapt to N bag conditions, New manifolds in optimized position New hood and cathode frame : Andrei and Nicolai  mostly done Replace anodes on DC04 t0 DC11, construct 8(10) new DC LV+HV cable labeling + mount: Test in aquarium with gas regulation, mount and test on support of modified and new DC Transport, and insert of support with 16 DC and TC+N bag in COBRA Test cabling in COBRA DC_status

  18. DC_status

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