Efficiency vs. Accidentals based on MIMOSA5 Results, 0.35 AMS

A cut on the seed pixel at signal/noise of 5 includes essentially all of the min-I signal ref [1]. This is with a pixel noise of 21 e-rms. This measurement was made at 0 deg C to reduce the shot noise. For MIMOSTAR 0.35 AMS we expect similar performance at room temperature because of the much shorter integration time with a 4 ms frame rate.

The accidental fraction for the seed pixel discriminator set as 5 s noise is:

The expected number of seed pixels above threshold for the 640 X 640 pixel, MIMOSTAR based on 0.35 micron AMS technology is:

per CDS frame

Achieving this will require mapping and removal of hot pixels.

References:

Grzegorz Deptuch, "Monolithic CMOS Pixel Detectors in Particle and Nuclear Physics", PIXEL2002 - International Workshop on Semiconductor Pixel Detectors for Particles and X-rays, Carmel Mission CA, USA, September 9-12,2002 p. 10. fig. Seed Pixel Signal/Noise

C:\Documents and Settings\Howard Wieman\My Documents\aps project\deptuch LEPSI IReS\pix2002_deptuch.pdf