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Point sur les mesures environnementales

Study quantifies pressure, temperature, and other variables' impact on gain variation for detection efficiency. Experimental setup includes Bulk Micromegas chamber, gas flow control, and data analysis for gain measurements and spectra. Results show significant correlations between pressure, temperature, and gas mixture on gain and amplification gap. Linear relationships observed for gas percentage and temperature variations on gain. Predictions and measurements support the study's objectives.

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Point sur les mesures environnementales

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  1. Point sur les mesures environnementales M. Chefdeville Reunion 31/03/09

  2. Objectifs de l’etude • Quantifier l’impact de divers variables sur le gain • Pression • Temperature • Tension de mesh • Flux de gaz • Gap d’amplification • Concentration du mélange gazeux • Mesureou simulation/calcul • Au final • Variation de gain -> variation d’efficacite de detection η • Modele simple: MIP traversantperpendiculairement • Integration numerique: η(G) sur un damier Gas MIP

  3. Mesuresenvironnementales • Banc experimental • Bulk Micromegas 128 μm Chambre 6x16 cm2 • 2 DebitmetresmassiquesAr & CO2 + 3 rotametres + 3 chambres + 3 bulleurs Flux de gazd’environ 1 l/h sur 3 chambres • Lecture de la mesh ORTEC preamp + ampli + ADC + CENTAURE 2.199 +/- 0.026 ADU/fC • Analyse de donnees • Record 55Fe pulses Reconstruct spectra offline • Fit triple gaussian function 6 free parameters

  4. Resume des mesures Pressure (mbar) & time Peak (ADU) & time (days) Temperature (degC) & time Peak P-corrected & time

  5. Pic du fer et pression Distribution de la temperature • Scatter plot de la position du pic et de la pressiona temperature constante • Depend de la plage de T • Plus petite barred’erreur entre 24.8-24.9 degC ΔG/G ~ p1.ΔP/P2 ~ 0.6%/mbar G = exp(p0+p1/P)

  6. Pic du fer et temperature • Scatter plot de la position du piccorrigee pour les variations de pression et de la temperature • Selectionneuneimportante variation de temperature Peak P-corrected & time Temperature (degC) & time

  7. Pic du fer et temperature • Scatter plot de la position du piccorrigee pour les variations de pression et de la temperature • Selectionneuneimportante variation de temperature G = exp(p0+p1.T) (! Linear fit on plot) ΔG/G ~ p1.ΔT ~ 1%/degC

  8. Pic du fer et melange • Gain diminue avec le % de CO2 • Mesures OK • Seulement 3 melangesdifferents • Simulation du gain avec MAGBOLTZ • Importantes differences certainsprocessusd’ionisation ne sont pas implementes • Cependant variations relatives OK G = exp(p0+p1.f) (! Linear fit on plot) ΔG/G ~ p1.Δf ~ 10%/1%CO2

  9. Gain et gap d’amplification • A faible champ electrique (<100 kV/cm), le coefficient de Townsend varielineairement avec le champ • G = exp(α.g) = exp((A+B.E)g) = exp(C+A.g) E = V/g • ΔG/G = A.Δg • Pente des courbes de gain: • G(V) = exp(a+bV) • Mesure de a et donc de A • Predictions: ΔG/G = -11.5% Δg [Δg] = μm

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