Pixel Circuit Flushing (Loop Backs)

Updates

February 6, 2008 This page has been established in order to allow documentation of the pixel loop back work. Ideally, an entry will be recorded for every shift that a loop back is run, in addition to plots and tables that may shown important QA data.

February 14, 2008 C side is complete, as of last night.

February 26, 2008 All loop backs complete as of midnight, with exception of circuit 5, which is still in need of cable work. Circuit 75 has shown extremely low power, going under 10% before equilibrating.

February 28, 2008 Circuit 75 is being reinstrumented with a flow meter and inlet and outlet pressure sensors. We will run All of octant C7, including circuit 75, today.

Loopback Mapping

Updated: 27 February, 2008, by Jerome


Mapping File: Please update as needed and repost, but be sure to modify the date updated above, and your initials. Thanks!

Shifts

Tuesday, February 5th, 2008 - C6

Summary This evening 5 loopbacks in quadrant C6 were operated: 48,59,62,64,65. Although a cart is currently connected to C5, as well, there is one loop that currently causes plant shutdown due to overtemperature (loop 60) and one loop with a bad interlock TC (loop 49) so it was decided not to run C5 until these can be fixed.

Monday, February 11th, 2008 - C3, C4

Summary The octants C3 and C4 were run today from about 11:00 to 15:30. Only one anomalous circuit was observed, which corresponded to heater 01/29, which had been observed to have anomalous power in both previous quadrants. However, power in this heater (loop 23) was observed to reach values as high as 85% (versus a previous maximum of ~65%), and the development of this power took hours. In addition, two "problems" were initially encountered with the thermocouples on this circuit. First, on the previous friday, the interlock sensor on circuit 23 was observed to be non-functional. Examination of the sensor on monday turned up nothing and the sensor was functioning. Then, on monday morning, the fluid sensor on circuit 43 was found to be non-responsive. Jiggling the connector on this circuit "cured" this problem, as well, and running commenced for the rest of the day.

Wednesday, February 13th, 2008 - C1, C2

Summary The octants C1 and C2 were run today from about 16:50 to 20:50. Octant 2 was seen to have significantly higher power than Octant 1, in general, with the hottest heater in O2 at 75% and the lowest in O1 at about 22%.

-- NealHartman - 06 Feb 2008