5 T SUPERCONDUCTING DIPOLE MAGNET
Shinji MITSUNOBU, Yasuo AJIMA, Kenji HOSOYAMA, Junichi KISHIROYoshiharu KOBAYASHI, Yukinori SAKAKIBARA, Akio TERASHIMAAkira YAMAMOTO, Toshio HONGO and Hiromi HIRABAYASHIKEK, National Laboratory for High Energy Physics
Abstract
In this report, the recent developemnt of 5 T superconductin g accelerator
magnets for ,the TRISTAN proton ring .is described. Three 1 m test dipole magnets have been constracted. The training was obviousely reduced with application of higher prestress at the clamping.
Introduction
For the second phase program of the TRISTAN project, the installati~n ofa superconductin g proton ring of several handreds GeV is being proposed 1 toperform a colliding beam experiment between electron and proton. A couple of
5 T NbTi/Cu dipoles have been)co~st5ucted to study the production procedureand operational performance. 2 • 3 ' 4
1 m model magnet
Using the same production procedure of two 1m model magnets, 3 ) thethird 1 m model magnet has been constructed. The coil was wound in double
shells using Rutherfored type compacted strand cable, which is the NbTi keystoned flat cable containing 27 strands of 0.71 mm in diameter. The cable wasinsulated with Kapton and small amount of Epoxy resin. The insulations offour layer of 25 ]1 Kapton and two layer of 50 Jl thick Kapton with gap wereenough to insulate turn to turn under the pressure of 13 kg/mm 2 • Advantage touse Kapton insulation other than glass tape insulation was pointed out below.
i) The coil was more tightly wound especially at the coil end part.
ii) The th~ckness of insul~tion was controlled easily and accurately.
iii) The thickness of insulation was reduced small amount and extra two turns
were added for the each half coil of the third.magnet.
The results of the magent training experiment are protted.in Fig. 1.
The training was obiously reduced with application of higher prestress at
the clamping:and of higher tension to wind a coil tightly using the Kapton insulated cablg.
Full size dipole magnet
Based o;ii;. experience in this series of 1 m long .TRISTAN test. dipole, now
we are devel6ping a 5 m 5 T full size dipole magnet. The aim of this development is to c'onfirm the specification and parfomance of a practical accelerator
magnet. Table 1 shows the principal parameters of the .full size dipole magnet. Already we wound the double shell·· cpils of this magnet. The full size
dipole magneti: will be assembled and iri.stalled in a horizontal cryostat with inseveral montJl.s.
Refe,rences P
1) Y. Kimur~; "TRISTAN", Invited Paper at Kith International Conference on
High Eneigy Accelerators, CERN, July 7-ll, 1980. .
2) H. Hirab~yashi; IEEE Trans. MAG...:17, 728 (1981).
3) S. Mitsui:!.obu, K. Hosoyama, A•. Yamamoto, J. Kishiro, T. Kohriki, T. Kubo,H. Hirab,;ayashi andY. Kimura; IEEE Trans. NS-28, 3266 .(1981).
4) K. Hosoyama, et al.; "A NbTi superconductin g Magnet installed in a pressurized)heliu m II Cooling both" to be published ~n J .J .A.P. (1982).

-313-

Table 1
Parameters of TRISTAN Full Scale Dipole Magnet (SD-FA-3100)
Coil Inner Diameter
Warm Bore Diameter
Coil Length
Magnetic Length
Coil Weight
Total Weight
Central Field
Current at 5 T
Stored EnergyInductance
Bursting ForceFig. 1

140 mm
90 mm5100 mm4820 mm
2 Ton
9.5 Ton
5 T
4870 A
1.6 MJ
135 mH220 Ton/m

TRISTAN test dipole training curve.

6I!:;,.
!:;,./::,.

-5t::,./::,.!:;,.00
000u00!:;,.
!:;,.

00([)

I0

oo00!:;,.
!:;,.

4o#l Magnet
0#2 Magnet
t::,.#3 Magnet

00000000 003oo 0000oo_l_l

1020
Number of Quench-314-30