1. 1 CPC2-CPR2 Assemblies Testing Status Charge Amplifiers –Attempts to make them work Best voltage single channel performance @ 2MHz Cluster finding first results Planning

2. 2 Charge Amps No success yet Spent hours with Steve and Peter on Thursday –Setup system so hits are clearly visible on voltage channel analogue output –Monitor charge channel analogue output –Some noise due ADC code conversion, can be removed. –Change in noise patterns with variation of the relative chip grounds, still no signals –Still some behaviour to be understood, some explained Keep thinking and trying –Only one channel of one device tested, statistics are low.

3. 3 Best Performance @ 2MHz Noise in e- stays similar until signal is half that of the edge. Gain dependant on position in the array, noise is amplified too. Slight reduction in noise when cluster finder clocks are off. (No plot sorry) ADC 240 ADC 197

4. 4 Cluster finder tests Its possible to test cluster finder! Although some channels always flag data for readout, multiplexer only visits them once each cycle. Its possible to “sneak” data through from good channels, if careful with occupancy. Junk data is hidden (due to garbled timestamp) Edge of chip Fe55 Peak Noise Peak

5. 5 Examples

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9. 9 Accumulated data

10. 10 Remove channel pedestals

11. 11 Plans One more week of testing with MB4.4s –Second assembly –Go fast as possible (commercial driver limited) –Sort out charge channels –Improve some results, lots of data! Make way for MB5.0 –Come back high speed testing when driver chip can be used