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Noise PSDs at various TES states

DIB1 DIB2 DIB3
pA pB pC pD pA pB pC pD pA pB pC pD
Data taken on 2015 Oct 08
DIB1 and DIB3: Rev C.1, total output gain = 16, front-end gain = 5
DIB2: Rev C, total output gain = 15, front-end gain = 2
0 charge bias

DCRCs stacked


DCRCs spread out

Comments:

  • There was rather prominent ~250 Hz noise during these tests (typically we avoid this pattern when taking data).
  • In all cases the spread-out arrangement improves low frequency noise (including the peak)
  • In most cases the stacked arrangement worsens the mid-frequency noise
  • DIB1 was more affected by stacking (compared to side-by-side) than the other two DIBs
  • Stacking had a weaker effect in these tests than on the September 24 tests. In the previous case the DCRCs were separated only by a couple of pieces of paper; in the current case they were separated by pads of paper.