Modifications to TEAPOT for Studies of Local Decoupling in the RHIC Arcs Page: 1 of 5
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Modifications to TEAPOT for Studies of Local
Decoupling in the RHIC Arcs
L. Schachinger and R. Talman
April 2, 1996
Individual beam position monitors (BPM's) in the arcs of RHIC will be able to mea-
sure the beam position in one plane only. Those near a focusing quadrupole (QF) will
measure the position of the beam in the horizontal plane while those near a defocusing
quadrupole (QD) will measure the vertical position. This configuration gives suffi-
cient information for correcting the orbit in the arcs, but makes local decoupling less
straightforward than it might otherwise be.
Local decoupling requires a measurement of the beam position in both planes
at the same location. With BPM's constructed so that the beam position in only one
plane is available, strictly speaking, we cannot directly measure the coupling anywhere.
The purpose of this work was to create a TEAPOT environment in which one could
explore whether interpolating the beam position between alternate BPM's might yield
a position accurate enough to allow the local decoupling of the RHIC arcs.
We assume that the ability exists (in hardware) to kick the beam in both planes. The
procedure we use within TEAPOT is to track a particle with an initial kick in the hor-
izontal plane, and use the measurement of the horizontal beam position at the BPM's
which can measure the beam position in that plane (HBPM's) to interpolate the hor-
izontal position at the VBPM's. Since we have a direct measurement of the vertical
position at the VBPM's, we can use the interpolated horizontal position and the mea-
sured vertical position to calculate the coupling there. We then track a particle with
an initial vertical kick, and interpolate to get the vertical position at the HBPM's. By
using the in-plane amplitude to interpolate, we minimize the effect of coupling errors
on the interpolation.
The interpolation is done using the position of the tracked particle at BPM's that are
nearest neighbors to the BPM at which we are computing the interpolated coordinate.
For the case in which we are interpolating the horizontal coordinate at a VBPM using
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L., Scachinger & Talman, R. Modifications to TEAPOT for Studies of Local Decoupling in the RHIC Arcs, report, April 2, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc869416/m1/1/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.