CEA DSM Dapnia Sédi • Streamer theory Streamer theory • Protection Protection schemes schemes • Some ideas Some ideas Input Protection for Gas Detector Electronic Readout Frédéric Druillole Frédéric Druillole Thanks to :Alain Le Coguie, Xavier De La Broïse, Estelle Monmarthe Thanks to :Alain Le Coguie, Xavier De La Broïse, Estelle Monmarthe
12
Embed
CEA DSM Dapnia Sédi Streamer theory Streamer theory Protection schemes Protection schemes Some ideas Some ideas Input Protection for Gas Detector Electronic.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
CEA DSM Dapnia Sédi
• Streamer theoryStreamer theory• Protection schemesProtection schemes• Some ideasSome ideas
Input Protection for Gas Detector Electronic Readout
Frédéric DruilloleFrédéric DruilloleThanks to :Alain Le Coguie, Xavier De La Broïse, Estelle MonmartheThanks to :Alain Le Coguie, Xavier De La Broïse, Estelle Monmarthe
• Discharge probability : ~3.10-12 (104)• Performance degradation due to discharge• High Gain• Energy resolution ~18%FWHM• Spatial resolution <~60µm• High rate • Large scale
• Discharge probability : ~10-3 to 10-9 (104)• No Performance degradation due to discharge• High Gain• Detection efficiency ~100% •Energy resolution ~20%FWHM• Spatial resolution <~100µm• High rate, weak radiation length • Large scale
Im p u rity : d ie lec tr icE in c rea se s ,e lec tro n s in c rea se
Streamer : If the number of electron produced during the avalanche reach 107 ~108 Divergence of the avalanche goes to a streamer phenomenum.Impurities in the amplication zone could also amplify the Electric field and increase the number of electrons.
• Avalanche with a critical size• Creation of secondary electrons in the head of the streamer• Creation of a conducting channelCreation of a conducting channel• Could weld the grid on the pad (Permanent short Could weld the grid on the pad (Permanent short circuit)circuit)
1. Sparks protection2. Permanent short circuit protection3. High Voltage Components4. supplied diodes (additional noise)5. current injection risk (diode symetry)
1. Sparks protection2. No additional noise3. Unsupplied diode4. No current injection risk