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Kudos to Cynthia and Yuki for putting the giant X-Y beam mapping frame together in around 1.5 days.
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Our test assembly outside here on campus.
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X and Y position readout courtesy of 10-turn pots.
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PIN modulated Gunn source mounts in 2 orientations.
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Getting BICEP cryostat outside was easy, getting it onto the lab stand again was hard.
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We need a better version of this for the service stand at Pole!
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Measuring the sky temp--finished with the LN2.
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Saturday night: using Chao-lin's 45 degree mirror for beam mapping across the parking lot.
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180 feet away, the source.
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Cynthia's prototype thermal source. Version 2 is already in the works...
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Darren's steady aim...
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...trying to find the moon, which that evening, July 31st, was full: a blue moon!
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There it is.
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And there again.
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Kiwon's time constant measurements while we set the X-Y stage up on the roof.
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Other uses for the lift stand...
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Beam mapping starts, already late.
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BICEP viewed from up-range.
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Yuki manning the X-Y stage.
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Doing a 5 minute X-Y raster.
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By dawn's early light, still taking data.
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Cynthia needs sleep.
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Yuki needs sleep.
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John needs sleep.
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The source: 100 GHz Gunn, 0-30dB attenuator, PIN switch, WR-10 to .094" circular aperture.
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Looking down on BICEP.
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One more raster...
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Tuesday, R5's end: the 80-100 GHz Gunn, rotating in the near field. Interesting structure.