Dose Calculation

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Dose (C/cm):

\frac{\#e}{1cm} \times 1.60 \cdot 10^{-19} C/e \times gas gain


  • Lamina 300 A: 
    3.6\cdot10^{11}\times1.6\cdot10^{-19}\times2\cdot10^{5} = 0.01~C/cm
  • Lamina 12 μm: 
    1.2\cdot10^{11}\times1.6\cdot10^{-19}\times2\cdot10^{5} = 0.004~C/cm
  • CMU mylar: 
    1.4\cdot10^{11}\times1.6\cdot10^{-19}\times2\cdot10^{5} = 0.004~C/cm
  • CMU kapton: 
    2.9\cdot10^{11}\times1.6\cdot10^{-19}\times2\cdot10^{5} = 0.009~C/cm


EM background: 40~kHz/strawor 267~Hz/cm

  • 1 year of running (= 1/3 year beam on target) = 1.1\cdot 10^{7}s \times 267 \frac{e}{s\cdot cm} \times 1.60\cdot10^{-19}C/e \times 2\cdot 10^{5} = 9.0 \cdot 10^{-5} C/cm
  • Irradiation dose = \geq44 years of running
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