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| Dielectronic recombination-assisted laser spectroscopy |
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Message ID: 35
Entry time: Wed May 11 01:09:07 2022
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| Author: |
Patrick, Sebastian, Volker, Guy |
| Category: |
Laser |
| Subject: |
Beam overlap |
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We overlapped the laser with the ion beam.
The ion beam positions are:
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device | move in dir. | scratch (mm) | gone (mm) | gone + 4.5 (mm) | x0 (mm)
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GECEDS1VU | up | -3.0 | -2.7 | 1.8 |
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GECEDS1HA | right | -21.9 | -20.9 | -16.4 | -4.7
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| left | -12.0 | -13.1 | |
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GECEDS2VU | up | -3.8 | -2.9 | 1.6 |
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GECEDS2HA | right | -19.2 | -18.4 | -13.9 | in [-0.1, 4.3]
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| left | -9.0 | -9.7 | |
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We used the "gone + 4.5" column where the scraper is in the middle of the ion beam to adjust the laser.
Picture 1: Final beam position.
Picture 2: Final MRC settings.
Note 1: By switching to the "real" bunching frequency, the laser went out of the stabilization. We restarted the MRC system and shifted the laser back into position with the piezo mirror, looking at the first screen (without amplifiers!).
After enabling everything again, the before found settings did not correspond to the correct beam position anymore, so we overlapped again.
Note 2: After the repositioning, the horizontal screw was at its limit and the beam stabilization failed. We moved the screw away from the limit while still hitting the screen and restarted the MRC system. The laser could then be stabilized again. |
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