1M. Ellis - Tracker PC - 7th March 2007 VLPC Cassette Characterisation  Third application (as described in past tracker meeting and CM17) is now working.

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Presentation transcript:

1M. Ellis - Tracker PC - 7th March 2007 VLPC Cassette Characterisation  Third application (as described in past tracker meeting and CM17) is now working and has been used on the data taken from cassettes 105 and 112.  First look at cassette 105 data and compare set points determined by this application with those used at KEK.  Then look at unknown cassette 112.  Application attempts to categorise each channel as either: u Dead(no obvious light with the LED on) u Alive(good multi photon fit) u Break down(wide pedestal, no clear multi photon peaks)  The application determines for each MCM which voltage produces the maximum number of alive channels with the highest number of photons seen (i.e. maximum QE).  The gain is also returned for this optimum value.

2M. Ellis - Tracker PC - 7th March 2007 Cassette 105  Was used in KEK.  Set points were taken from D0 values and then modified while at KEK to attempt to optimise the performance for the cosmic ray data taking (lower rate).  This optimisation was done “by hand”, but serves as a resonable basis for comparison.  Following plots show results of application.  Three plots per MCM: 1. Shows the number of dead (red +), alive (green *) and broken down (blue o) channels as a function of the bias. 2. Shows the gain as a function of bias 3. Shows the number of photons as a function of bias.

3M. Ellis - Tracker PC - 7th March 2007 Cass 105 – MCM 1

4M. Ellis - Tracker PC - 7th March 2007 Cass 105 – MCM 2

5M. Ellis - Tracker PC - 7th March 2007 Cass 105 – MCM 3

6M. Ellis - Tracker PC - 7th March 2007 Cass 105 – MCM 4

7M. Ellis - Tracker PC - 7th March 2007 Cass 105 – MCM 5

8M. Ellis - Tracker PC - 7th March 2007 Cass 105 – MCM 6

9M. Ellis - Tracker PC - 7th March 2007 Cass 105 – MCM 7

10M. Ellis - Tracker PC - 7th March 2007 Cass 105 – MCM 8

11M. Ellis - Tracker PC - 7th March 2007 Cass 105 – Results AFE MCM Bias Alive Gain Num PE MCMKEK VCalib VGain# PE Voltages determined by application seem to be in reasonable agreement with values used in KEK run. Gains at these voltages are also similar. Mean number of PE is uniform ~ 10% over the cassette. No dead channels in cassette 105

12M. Ellis - Tracker PC - 7th March 2007 Cassette 112  New VLPCs with unknown performance.  No prior experience (D0 or MICE) so no idea of correct bias, number of dead or noisy channels, gain, QE, etc...  Application returned the following:  A few channels are apparantly dead.  Two MCMS have all channels good.  Worst MCM has 5 dead channels.  Overall: 495 out of 512 good channels

13M. Ellis - Tracker PC - 7th March 2007 Cass 112 – MCM 1

14M. Ellis - Tracker PC - 7th March 2007 Cass 112 – MCM 2

15M. Ellis - Tracker PC - 7th March 2007 Cass 112 – MCM 3

16M. Ellis - Tracker PC - 7th March 2007 Cass 112 – MCM 4

17M. Ellis - Tracker PC - 7th March 2007 Cass 112 – MCM 5

18M. Ellis - Tracker PC - 7th March 2007 Cass 112 – MCM 6

19M. Ellis - Tracker PC - 7th March 2007 Cass 112 – MCM 7

20M. Ellis - Tracker PC - 7th March 2007 Cass 112 – MCM 8

21M. Ellis - Tracker PC - 7th March 2007 Conclusions  When I get a chance I want to tidy up the third application so that it is a little more user friendly, then it will go into CVS.  I think the tools are working reasoanbly, although I suspect Alan and I need to spend some time together looking over the results to tweak a few things.  We can get going with the VLPC characterisation (still need to sort out cryo set points for 9.5K though).  It looks like Cassette 112 should be fine for QA work, but perhaps shouldn’t be used for a production cryostat.