Fixing the Closed Orbits in the Debuncher Page: 1 of 8
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Mike Halling
4/5/91
PBAR NotelffO-
Fixing the Closed Orbits in the Debuncher
Without a large number of new trims the best way to fix the
closed orbits in the debuncher is to move quads. There are some
obvious features in the vertical orbit, Figure 1, that look like
they are indeed orbit distortions. The horizontal orbit, Figure 2,
also has some systematic features that can be removed by moving a
small number of quads. It is likely that removing these orbit
distortions will help in improving the aperture. In addition, the
second order effects of such large offsets in the closed orbit,
like changes in phase advance due to the sextapoles, could improve
operations.
VERTICAL ORBIT
The vertical closed orbit can be improved greatly by moving
only four quads, one of which is motorized. Figure 3 shows the
changes necessary and the final closed orbit. Orbit distortions of
about 9 mm are reduced to about 4 mm. Figure 4 shows that by
moving a few more devices the orbit deviations can be improved by
another factor of two. I may be worth the extra effort to use the
orbit shown in Figure 4.
HORIZONTAL ORBIT
The horizontal closed orbit has two distinct features, a
large narrow bump near D3Q3 and a broad lump near D5QO. Figure 5
shows that the broad lump can be removed by moving two quads and
adjusting three trims. The rest of the closed orbit can be
smoothed out be moving three more quads and adjusting another trim,
as is shown in Figure 6.
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Halling, Mike. Fixing the Closed Orbits in the Debuncher, report, April 5, 1991; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1013106/m1/1/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.