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2012/04/23

1155 Filled LN2 cold trap.
1315 Start condensing mixture through nitrogen cold trap 1.
1515 Start circulating mixture. Switch to tower thermometer.
1808 Temp ~80mK. Start taking PSD data.
2345 Finish taking data.

Charge Noise PSDs

Figure 1: DCRC32 attached to Flexible Side Coax; DCRC33 attached to Vacuum Side Coax.
Figure 2: DCRC33 attached to Flexible Side Coax; DCRC32 attached to Vacuum Side Coax.
Figure 3: DCRC32 attached to both side coaxes.
Figure 4: DCRC33 attached to both side coaxes.

Speaker

  • Speaker was mounted on fridge frame
  • 10Vpp square wave fed into speaker at 5, 10, 20, 50, and 100kHz
Figure 5: Top and Side views of speaker mounted to fridge frame.
topviewofspeakermount.jpg sideviewofspeakermount.jpg