1. M. Dracos LNGS, 03 August 2006 1 Target Tracker

2. M. Dracos LNGS, 03 August 2006 2 Rate tests SM1 Sensor (1,3,4) no signal Plane 6 absent Sensor (1,2,7) no signal Sensor (1,2,12)ch60 171 light leak low count Sensor (3,1,12) no signal Sensor (1,0,16)ch1 107 light leak Sensor (1,2,16)ch64 304 masked (light leak) Sensor (3,0,16)ch1 308 masked (light leak) Sensor (3,2,16)ch64 295 masked (light leak) Sensor (1,0,18)ch1 134 light leak Sensor (1,3,20)ch64 226 masked (light leak) Sensor (3,2,22)ch64 173 masked (light leak) Sensor (1,0,23)ch1 3045 masked (light leak) Sensor (3,0,23)ch1- 32 strange noise Sensor (3,3,25) no signal Sensor (1,1,27)ch1 1653 masked (light leak) Sensor (3,1,27)ch1 3733 masked (light leak) Sensor (1,3,28)ch64 849 masked (light leak) Sensor (3,1,28)ch1 251 masked (light leak) Sensor (3,3,28)ch64 123 light leak Sensor (1,2,29)ch1 328 masked (light leak) Sensor (1,0,30)ch1 235 masked (light leak) 1 TT wall absent 4 sensors absent 1 problematic chip or flat cable (32 ch.) "electronic" problem on ½ sensor Real light leaks: 5 ch. Masked ch.:12 (>200 Hz)

3. M. Dracos LNGS, 03 August 2006 3 Rate tests SM2 2 TT wall absent 13 sensors absent 2 problematic chips or flat cables (32 ch.) Real light leaks: 2 ch. Masked ch.:4 (>200 Hz) Sensor (3,0,1) no signal Sensor (0,0,4) no signal Sensor (1,3,4) no signal Sensor (1,3,11) low count Sensor (2,3,12) absent Plane 13 absent Sensor (1,2,14) no signal Sensor (3,2,14) no signal Sensor (3,1,17)ch1 125 light leak Sensor (1,1,18) absent Sensor (1,0,20)ch1 288 masked (light leak) Sensor (3,0,21) no signal Sensor (1,2,23)ch64 2138 masked (light leak) Sensor (3,2,23)ch64 1359 masked (light leak) Sensor (1,0,24)ch44 510 masked (light leak) wrong correction factor Sensor (1,2,26) no signal Sensor (3,1,26) no signal Sensor (1,0,27) no signal Sensor (3,1,27)ch4 106 light leak low count Sensor (0,1,28) no signal Sensor (1,0,28) no signal Sensor (1,2,28)ch1 126 light leak Sensor (2,1,28) low count Plane 29 absent

4. M. Dracos LNGS, 03 August 2006 4 Light pulsers SM1 13 l.i. absent 4 LED's or cables disconnected? 1 cable disconnected? Sensor (0,0,1) pulse generator? Sensor (3,3,2) pulse generator? Sensor (0,0,3) pulse generator? Sensor (0,1,3) pulse generator? Sensor (0,2,3) pulse generator? Sensor (3,3,5) pulse generator? Sensor (2,1,8) one LED does not work Sensor (3,3,9) one LED does not work Sensor (0,1,11) one LED does not work Sensor (1,2,12) check the cable connections Sensor (3,1,12) pulse generator? Sensor (3,2,15) pulse generator? Sensor (3,1,21) pulse generator? Sensor (3,2,25) one LED does not work? Sensor (3,3,25) pulse generator? Sensor (3,0,27) pulse generator? Sensor (3,1,27) pulse generator? Sensor (3,3,28) pulse generator?

5. M. Dracos LNGS, 03 August 2006 5 Light pulsers SM2 8 l.i. absent 3 LED's or cables disconnected? 2 cables disconnected? Sensor (1,1,2) one LED does not work Sensor (0,0,4) pulse generator? Sensor (1,3,4) pulse generator absent/broken Sensor (0,1,5) onle LED does not work Sensor (3,0,10) only LED does not work Sensor (1,3,11) check the cable connections Sensor (1,1,16) pulse generator absent/broken Sensor (1,1,19) pulse generator absent/broken Sensor (3,1,26) pulse generator absent Sensor (1,0,27) pulse generator absent/broken Sensor (3,1,27) check the cable connections Sensor (1,0,28) pulse generator absent/broken Sensor (0,1,28) pulse generator?

6. M. Dracos LNGS, 03 August 2006 6 To do by TT group Replace the front-end cards where chip problems Investigate about "missing" light injectors magnetic field tests (ON/OFF) but after: ~all sensors present ~all light injectors working properly all PMT numbers and correction factors checked

7. M. Dracos LNGS, 03 August 2006 7 TT running modes TT "Functions" pedestals rate/channel (few minutes): output: channel distribution light injectors: pulsing on one side and reading on the same side pulsing on one side and reading on the other side radioactivity (during long shutdowns): left/right correlations in order to remove DC cosmic rays (during long shutdowns) x/y correlations (how many, ideally 1 x/y correlation and read all TT walls) normal data taking mode clear document under preparation in order all TT shifters to be able to run all modes without "experts" around"

8. M. Dracos LNGS, 03 August 2006 8 For this year (after discussion with DAQ group) Threshold= 1 p.e (nominal value=0.3 p.e) Mask all channels with rate>200 Hz, go lower if DAQ still gets stuck (PMT spec. <300 Hz/channel for DC) For a common run with other detectors next week, TT is running since this morning in the following conditions: all channels with rate > 200 Hz masked, thresholds at 2 p.e, 2 x-y correlations (à la "Jacques"), every day stop and restart by hand the DAQ (Loic will do that, agreement with Artem) to re-activate possibly deactivated sensors and avoid problems with data-base.

9. M. Dracos LNGS, 03 August 2006 9 Rate tests versus threshold 1 p.e 2 p.e mean values for both SM ch.# 11.0 Hz(2 p.e)/18.5 Hz(1 p.e)

10. M. Dracos LNGS, 03 August 2006 10 Super-covers and scotch problems? same pieces of scotch used after intervention to glue back the super- covers!!! nothing written in the TT logbook about these interventions! once more, nobody is allowed to make any intervention on TT without reporting in the logbook.