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Status and future plans for the CMS 10x10 GEM prototype

Status and future plans for the CMS 10x10 GEM prototype. Time Measurement CMS GEM 10X10 S curve. S-curve step function fit. S-curves without CP. Time Measurement CMS GEM 10X10. Ed = 2.9kV/cm Et1 = 3.7kV/cm Et2 = 3.7kV/cm Ei = 3.7kV/cm Vgem1 = 415V Vgem2 = 380V Vgem3 = 335V

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Status and future plans for the CMS 10x10 GEM prototype

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  1. Status and future plansfor the CMS 10x10 GEM prototype

  2. Time Measurement CMS GEM 10X10 S curve

  3. S-curve step function fit

  4. S-curves without CP

  5. Time Measurement CMS GEM 10X10 Ed = 2.9kV/cm Et1 = 3.7kV/cm Et2 = 3.7kV/cm Ei = 3.7kV/cm Vgem1 = 415V Vgem2 = 380V Vgem3 = 335V VFAT Threshold 80

  6. Time Measurement CMS GEM 10X10 Zoom image Ed = 2.9kV/cm Et1 = 3.7kV/cm Et2 = 3.7kV/cm Ei = 3.7kV/cm Vgem1 = 415V Vgem2 = 380V Vgem3 = 335V VFAT Threshold 80

  7. Time Measurement CMS GEM 10X10 Ed = 2.9kV/cm Et1 = 3.7kV/cm Et2 = 3.7kV/cm Ei = 3.7kV/cm Vgem1 = 415V Vgem2 = 380V Vgem3 = 335V VFAT Threshold 80 Time [ns]

  8. Time Measurement CMS GEM 10X10 Ed = 2.9kV/cm Et1 = 3.7kV/cm Et2 = 3.7kV/cm Ei = 3.7kV/cm Vgem1 = 415V Vgem2 = 380V Vgem3 = 335V VFAT Threshold 30

  9. To do • S-curve before each run? • Runs with very small threshold • Improve the efficiency • The LHCb Power supply cannot go more then 3.6kV/cm On the Ei and ET1, ET2. Ed max is 3.4kV

  10. Honeycomb GEMPictures

  11. Honeycomb GEMI/V plot Measured currents with one HV filter in the chain

  12. First Spectrum

  13. X-ray With the Smallest Collimator

  14. Honeycomb GEM discharge studies

  15. Honeycomb GEM discharge studies • The discharge went trough all GEMs. • Need to replace them with new ones. • Measure the HV currents of the “broken” ones

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