RHIC D0 INSERTION DIPOLE DESIGN ITERATIONS DURING PRODUCTION. Page: 1 of 3
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RHIC DO INSERTION DIPOLE DESIGN ITERATIONS DURING
J. Schmalzle, M. Anerella, G. Ganetis, A. Ghosh, R. Gupta, A. Jain, S. Kahn, G. Morgan,
J. Muratore, W. Sampson, P. Wanderer and E. Willen,
Brookhaven National Laboratory, Upton, New York 11973, USA
Iterations to the cross section of the Relativistic Heavy Ion
Collider (RHIC) DO Insertion Dipole magnets were made
during the production. This was included as part of the
production plan because no R&D or pre-production
magnets were built prior to the start of production. The
first magnet produced had the desired coil pre-stress and
low field harmonics in the body of the magnet and is
therefore being used in the RHIC Machine. On the first
eight magnets, iterations were carried out to minimize the
iron saturation and to compensate for the end harmonics.
This paper will discuss the details of the iterations made,
the obstacles encountered, and the results obtained. Also
included will be a brief summary of the magnet design and
There are twenty-four DO insertion dipole magnets
required in the RHIC machine. These magnets are being
built at BNL, with the production broken into two stages.
The first stage consisted of six magnets (four plus two
spares) required for the first sextant and the second stage
consists of the remaining magnets. The coil design uses 40
turns of 30 strand superconducting cable and 4 wedges.
The cold mass design is very closely based on the 8cm arc
dipole cold mass  adjusted for the increase in aperture.
A cross section of the cold mass is shown in Fig.1 and the
basic design parameters are as follows:
Number of turns per pole
Iron inner diameter
Iron outer diameter
The DO production plan called for cold mass
production to begin without the benefit of any R&D or pre-
* Work supported by the U.S. Department of Energy under
production magnets. Several features were therefore
incorporated into the design of these magnets that would allow
iterations to the cross section to be made during the course of
production in order to improve the field quality. Machined G-
10 shims were used at the pole and filled Kapton  caps were
used as spacers between the coil midplanes. Having various
sizes of these two parts in stock would allow changes to be
made without significantly interrupting production.
WARM-LIP ELECTRICAL BUS SLOT
' N BEAM TUBE
O / -STAINLESS
MID PLANE 0
I / STEEL
J - HELIUM PASSAGE
CONTAINMENT VESSEL LAMINATED 1OKE
Figure 1. Cross Section of RHIC DO Dipole Cold Mass.
The field harmonics are defined in the following relation:
By + iB, = 10-4B0 [bn+ian] ,
where Bx and By are the components of the field at (x,y) and B0
is the central field. a~ are the skew harmonics and b~ are the
normal. Ro is the normalization radius which is chosen to be
31mm in these magnets.
II. TEST ASSEMBLY
Past magnet building experience has shown that the first
magnet does not usually have the desired pre-stress and/or the
desired low field harmonics (b2 and b4). First article inspection
sample yoke lamination were used to collar a portion of the
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SCHMALZLE,J.; ANERELLA,M.; GANETIS,G.; GHOSH,A.; GUPTA,R.; JAIN,A. et al. RHIC D0 INSERTION DIPOLE DESIGN ITERATIONS DURING PRODUCTION., article, May 12, 1997; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc734872/m1/1/: accessed January 16, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.