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Setup df preset » History » Version 2

Anchi Cheng, 04/29/2020 06:17 PM

1 1 Anchi Cheng
h1. Setup df preset
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h2. Microscope setup for df preset
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1. Center the smallest C2 aperture you have.
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2. Center the beam and set in nanoprobe parallel illumication and eucentric focus in SA range imaging mode.
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3. Change spot size to larger number such as spot 10 and center this beam is needed through Direct Alignment reset Beam Shift.
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4. Change gun lens to get much weaker beam. For example from 3.3 to 7.1 reduces the beam current to 25%.  You probably won't be able to see the beam any more on the flucam.
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5. Push the diffraction button on the control panel to put this in diffraction mode.
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6. Select desired camera length
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7. Push the eucentric button on the control panel to focus the beam on the diffraction plane.
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8. Insert beam stop and center the diffraction beam behind it.
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h2. Camera setup for df preset
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dimension: 2048 x 2048
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binning: 2 x 2
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exposure time: 1000 ms (not used during movie collection, but used for DPreview node)
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h2. Cycle through hl and df presets a few times to allow it to settle on lens normalization before adjusting df preset diffraction shift again.  Repeat until satisfied.