The Warm Iron Geometry of the ?Average? RHIC Dipole Page: 4 of 7
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Fitting the average cold mass fiducial data
The second part of constructing the average iron geometry concerns the cold
mass fiducials, M1, M5, M6 and M10. In principle, these fiducials are 5.0 inches
in from the iron ends, and 4.8 inches radially displaced. In practice, and as
listed in Table 1, the optimum values for these parameters are slightly different.
These values were obtained by matching the "qaf" data recorded -by the
survey group for every dipole. These data will soon be available in the "quality"
table of the "survbase" Sybase database. After the data have been averaged over
all available DRG dipoles , their locations are symmetrised . This enables
the four model fiducial locations to be described by the two offsets recorded in
Table 1, instead of the eight parameters that would be necessary if each fiducial
was allowed to float independently.
A similar "average and symmetrise" procedure is followed for the tangential
beam tube offsets at each end. Note that the beam tubes are not allowed any
nominal radial offset.
Object x [inches] y [inches]
M1 fiducial 0.000 0.000
M5 fiducial 0.000 372.529
M6 fiducial -9.607 -0.163
M10 fiducial -9.607 372.692
Lead end beam tube -4.472 392.166
Non lead end beam tube -4.472 -19.637
Table 2: Location of the averaged and symmetrised cold mass fiducials, and the
beam tubes, according to the average dipole model. In the local "mancat" frame
the x-axis points radially inwards, while the y-axis points clockwise (looking
Table 2 lists the model locations of fiducials and beam tubes, in the local
"mancat" frame that is used by the surveyors to record the "qaf" or "quality"
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S., Peggs; Tepikian, S.; Trbojevic, D. & Wei, J. The Warm Iron Geometry of the ?Average? RHIC Dipole, report, July 1, 1995; United States. (https://digital.library.unt.edu/ark:/67531/metadc868164/m1/4/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.