# Threshold Scan Results

Threshold scan results have been analyzed with an automated software. Results shown in this web page have been obtained with the following procedure:

• The right half of the spectrum is fitted with an exponential: here ((png) and (eps)) are some sample fits (16 channels of 1 M5R4 FEB)
• The parameters are used to extract the slope (m) and intercept (q) values of the linearized distribution.
• m and q are used to compute (a) the x at which we have y = 0 (x_large) and (b) the x at which the rate is equal to 25 MHz (x_small).
• The differences btw (a) and (b) are computed as follows: diff = sqrt(a) - sqrt (b)
• Diff is converted in mV using the relation: mV = r.u.*2.35
• Diff_mv is then converted in fC by using the sensitivity: Diff_fC = Diff_mV/sensitivity. The values used for sensitivity are shown in table 1.
Table 1. Sensitivities used for the study
M1M2M3M4M5
RegionSensitivity (mV)RegionSensitivity (mV)RegionSensitivity (mV)RegionSensitivity (mV)RegionSensitivity (mV)
M1R1-M2R1 C; M2R1 W10; 15M3R1 C; M3R1W10; 14M4R115M5R115
M1R216M2R2 C; M2R2 W11; 14M3R2 C; M3R2 W11; 14M4R210.2M5R210
M1R310M2R311.7M3R311.5M4R310.1M5R39.6
M1R410.8M2R410M3R410M4R48.3M5R47                       ### Scatter plots                       Alessio Sarti