slac_er

4 ms·

1. 1.▲
   by slac_er 6y ago

   It ia a single camera with multiple CCD detectors on a common focal plane behind a shutter. It is not a single CCD on a common focal plane. Should there be such a 3.2GP sensor, the noise would be abysmal, silicon would be huge, pixels tiny,
2. 2.▲
   by slac_er 6y ago

   one image (sensor) at a time. We have multiple types of image processing we will do, some of which happens immediately and some of which happens several months later.
3. 3.▲
   by slac_er 6y ago

   A flat image was taken for bias subtraction and the debris shows up twice because the projector had moved slightly between images, so the image processing ended up subtracting where it didn’t need to and missing the original artifact.
4. 4.▲
   by slac_er 6y ago

   Those are cosmic rays
5. 5.▲
   by slac_er 6y ago

   None of the debris is on the sensors. There is some small amount of dust on a window, and it shows up twice as much due due to image processing performing bias subtraction. The sensors are in a cryostat, and the effective size you of what y