Status Report For Threshold Scans. Shaper/Sampler Drop Trims As promised new and improved trimming techniques have been developed. As suggested, we will.

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Presentation transcript:

Status Report For Threshold Scans

Shaper/Sampler Drop Trims As promised new and improved trimming techniques have been developed. As suggested, we will focus on trims calculated according to drop-off point, calculated separately for shapers and samplers. Here, drop-off is defined as the highest threshold where the bin content is greater than half the maximum bin content recorded. Owen Miller19/05/2008

Performance of different trims in the Shapers Owen Miller19/05/ Untrimmed - Basic Mean Trim - Separate Shaper and Sampler Drop-off trim

Performance of different trims in the Samplers Owen Miller19/05/ Untrimmed - Basic Mean Trim - Separate Shaper and Sampler Drop-off trim

Correlation Between Pixel Stats This is essentially an attempt to find out whether or not individual pixel statistics from their threshold scans are consistently related. Specifically the statistics studied are: Mean threshold, peak threshold and 50% drop-off. Owen Miller19/05/2008

Mean Vs Drop-off Owen Miller19/05/2008 ShapersSamplers

Mean Vs Peak Owen Miller19/05/2008 ShapersSamplers

Trim Vs Shift This study is (hopefully) primarily a sanity check, ensuring that the alterations in pixel behaviour caused by applying a trim are both consistent and predictable. The following graphs are based on a comparison between trimmed and untrimmed runs, showing how much the position of the drop-off changes with the trim applied to the pixel. Owen Miller19/05/2008

Histogram Showing the effects of Applying a Trim Owen Miller19/05/2008

Fe55 runs Several sets of per-pixel threshold scan runs were performed with an Fe55 source next to the sensor. The following slides show the threshold scans of several pixels with and without the Fe55 source. Owen Miller19/05/2008

Sensor 13, Column 0, Row 0 Owen Miller19/05/2008 Fe55No Source

Sensor 13, column 118, row 47 Owen Miller19/05/2008 Fe55No Source

Pedestals & Noise The pedestal of a pixel is related to its mean threshold (on a threshold scan). The noise of a pixel is related to the sigma of its threshold scan. Owen Miller19/05/2008

RMS of Pixels in the Sensor Owen Miller19/05/2008

Means of Pixels in the Sensor Owen Miller19/05/2008

Maximums of Pixels in the Sensor Owen Miller19/05/2008

Variation in Pixel Behaviour for Different Quadrants Owen Miller19/05/ c1 - c2

From the graphs on the previous slide we can get the following statistics: –Shaper Capacitor Region 1: Mean=5.2±24.0 Sigma=12±1.95 –Shaper Capacitor Region 2: Mean=5.5±24.35 Sigma=14.74±2.1 Owen Miller19/05/2008 Fit Results for Sensor 16

Fitting Program Marcel has been working on fitting program to deal with the ‘flat-top’ threshold scan distributions seen in the shapers. The program attempts to fit a Gaussian distribution to an individual pixel threshold scan. So far the program produces reasonable results in 90% of cases. Owen Miller19/05/2008

Pixel Threshold Scan, data and fitted Gaussian Owen Miller19/05/2008

Reliability of fitting Owen Miller19/05/2008

Laser Runs We are in the process of starting a study of the sensor using the laser. The laser will cover an area approximately 10 pixels by 10 pixels, this beam size is achieved purely by shutter control (no defocusing). Owen Miller19/05/2008

Sensor 18, Column 55, Row 85 Owen Miller19/05/2008 LaserNo Laser

Sensor 18, Column 82, Row 96 Owen Miller19/05/2008 LaserNo Laser

Variation in Trim Values Applied Owen Miller19/05/2008

Variation In Drop-offs Owen Miller19/05/2008