Run 11840, taken March 14 by Tingjun and Varuna, with one of the FEMBs pulsed, was very informative about which wires in the detector were read out by which electronics boards. There was a lot of pickup noise from an ongoing PMT test, which showed up primarily in U but also in V. The amount of pickup was strongly related to wire length. We could see patterns in the RMS as a function of LArSoft channel number that just weren't clear enough from the thermal noise data. We could see that a group of three FEMBs was rotated on the SE side (crate 3), and that the ordering of the channels on the top FEMBs was inverted. Shanshan confirmed that the mapping on the top was inverted, and two of the three swapped FEMBs were listed as swapped by Diana. After fixing the map, a lot of things start to make sense. A previously split blip in Run 10880 was put back together, the spacing between the comb Y wires now agrees with Nicola's spreadsheet, and the RMS vs. channel number is more smooth. This PR fixes separate issues that PR426 fixed -- these fixes would have been confused without the fixes of PR426.
Here's the RMS by channel on a log scale for run 11840, with the channel map as of PR426. All the electronics channel numbering is fine but we have problems with which wires the electronics are connected to. There are sawtooth patterns in half the U and V channels, and the three misplaced boards in East V are visible around channels 2500-3000
here's the split blip in V:
Here's the fixed RMS by channel plot:
Here's the fixed split blip, with LArSoft's confirmation of the prediction of the Y blip given U and V.
Run 11840, taken March 14 by Tingjun and Varuna, with one of the FEMBs pulsed, was very informative about which wires in the detector were read out by which electronics boards. There was a lot of pickup noise from an ongoing PMT test, which showed up primarily in U but also in V. The amount of pickup was strongly related to wire length. We could see patterns in the RMS as a function of LArSoft channel number that just weren't clear enough from the thermal noise data. We could see that a group of three FEMBs was rotated on the SE side (crate 3), and that the ordering of the channels on the top FEMBs was inverted. Shanshan confirmed that the mapping on the top was inverted, and two of the three swapped FEMBs were listed as swapped by Diana. After fixing the map, a lot of things start to make sense. A previously split blip in Run 10880 was put back together, the spacing between the comb Y wires now agrees with Nicola's spreadsheet, and the RMS vs. channel number is more smooth. This PR fixes separate issues that PR426 fixed -- these fixes would have been confused without the fixes of PR426.
Here's the RMS by channel on a log scale for run 11840, with the channel map as of PR426. All the electronics channel numbering is fine but we have problems with which wires the electronics are connected to. There are sawtooth patterns in half the U and V channels, and the three misplaced boards in East V are visible around channels 2500-3000
here's the split blip in V:
Here's the fixed RMS by channel plot:
Here's the fixed split blip, with LArSoft's confirmation of the prediction of the Y blip given U and V.