We measured vertical and horizontal ion beam positions. Unfortunately, the horizontal scraper positions can not be manipulated
by the "Device Control" software. Robert Boywitt has supported us a lot to get the drives moving by using the expert software on
a local control PC, which can only be remotely accessed from beapc032 with the usual experiment account "atplaser". In the first
try we were only able to determine the vertical positions of a beam which was not the 229Th (positions were measured already on
Sunday, 03.04.)
|
Scraper | ion beam position (outer->inner) | |
GECEDS2VU | -1.3(2) mm | |
GECEDS1VU | -0.7(2) mm | |
|
Finally, we got 229Th (Wednesday, 06.04.) and were able to measure the ion beam positions. Those are
summarized in the following table. The first values are those were the scraping begins, hence representing the
edge of the ion beam. The second values represent the central positions of the ion beam.
|
Scraper | ion beam position (outer->inner) | ion beam position (inner->outer)
| |
GECEDS2VU | -1.6(2) mm / -1.3(2) mm | | |
GECEDS2HA | -13.8(2) mm / -13.4(2) mm | -4.0(2) mm / -4.6(2) mm | |
GECEDS1VU | -1(4) mm / -0.9(2) mm | | |
GECEDS1HA | -18.1(2) mm / -17.6(2) mm | -7.7(2) mm / -8.2(2) mm | |
|
Schreenshots taken at scraper positions are given in Entry 142 |