February, 2004CMS Tracker Week1 Sensor Stability Measurements Objective: find simple method of observing sensor stability -> measure fluctuations in overall.

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Presentation transcript:

February, 2004CMS Tracker Week1 Sensor Stability Measurements Objective: find simple method of observing sensor stability -> measure fluctuations in overall leakage current Outline: setup and experimental method description results so far for 4 sensors (3 ST, 1 Hamamatsu) Mark Raymond, Imperial College

February, 2004CMS Tracker Week2 Experimental setup transimpedance circuit chosen to give ~ low impedance to guard ring, but could just use 100 k resistor to ground all room temp. (24 o C (+/- ~ 1)) (RH ~ 30 – 40 %) 100 k  => 100 mV /  A

February, 2004CMS Tracker Week3 Experimental Setup sensor op-amp circuit

February, 2004CMS Tracker Week4 scope setup Tektronix (TDS724D) operated in peak detect mode internal sampling (Gs/s) much faster than intervals between displayed samples displayed samples alternate between highest in one interval and lowest in next allows capture of fast transients over relatively long time period (few seconds) only red samples stored and displayed

February, 2004CMS Tracker Week5 4 sensors studied 1 st ST sensor type W7B (ID ) failed acceptance test - high leakage on one strip (and neighbours) (~ 10  A) 2 nd ST sensor type W7B (ID ) good sensor (I think), Ileak ~ V 3 rd ST sensor TOB (ID ) one leaky strip (~ 6  A) Hamamatsu type W4 (ID ) good sensor, Ileak ~ V

February, 2004CMS Tracker Week6 Measurements – 1 st ST sensor DC leakage measurement in close agreement with data provided (Vienna) take off at > 150V attributed to group of 3 strips only scope measurements show instability appearing for bias > 150 V, spiky transients and step changes 6.7  A DC current measurement clean => no significant noise contribution from measuring system DC leakage only

February, 2004CMS Tracker Week7 Measurements – DC + AC shows relative magnitudes of DC leakage and transient behaviour for all 4 sensors studied (instability not correlated with overall leakage current magnitudes)

February, 2004CMS Tracker Week8 AC only DC leakage subtracted – baselines offset

February, 2004CMS Tracker Week9 AC only instability characteristics different to 1 st ST sensor (no step changes) some evidence of instability but much better than first two

February, 2004CMS Tracker Week10 additional observations vacuum effects leakage current changes ~ randomly if vacuum to chuck turned on/off initially observed 50 Hz interference also traced to vacuum pressure variations these effects also observed on Hamamatsu sensor … not clear what’s going on here – leakage sensitive to stress?

February, 2004CMS Tracker Week11 Summary simple scope method used to monitor stability of overall sensor leakage current sensitivity at ~ few 10’s nA possible results for four sensors only – 3 ST and 1 Hamamatsu instability observable in 2 ST sensors (1 already rejected on overall leakage measurement) but instability characteristics not identical for these two probably worth looking at larger sample