1. Iranian Light Source Facility, IPM, P.O. Box 19395-5746, Tehran, Iran
5th International Particle Accelerator Conference (Dresden, Germany / June 15-20, 2014)
Design and Fabrication of the First Quadrupole Magnet for the ILSF Storage Ring
Saeidi, Farhad; Dehghani, Jafar; Moradi, Vahid; Shahveh, Abolfazl; Razazian, Mohammad; Fatehi, Samira;Ghasem, Hossein1,3; Rahighi, Javad; Pourimani, Reza 2
Iranian Light Source Facility, IPM, P.O. Box , Tehran, Iran
ABSTRACT
The Iranian Light Source Facility (ILSF) is a new 3 GeV third generation synchrotron light source which is consisted of several pre-accelerators and a storage ring with the beam current of 400 mA. Based on the main lattice candidate, the storage ring includes of 100 dipoles, 320 quadrupoles and 320 sextupole magnets. To develop fabrication procedures and techniques, a series of lattice magnets were fabricated in Iran with Iranian industries. In this article the first prototype quadrupole magnet fabrication process has been described.
3D simulations by RADIA code [3] to evaluate the multipoles along the beam trajectory has been done.
INTRODUCTION
There are three main magnet types, dipoles, quadrupoles and sextupole in charge of guiding a beam in all synchrotrons. Dipoles are fabricated to perform bending, though quadrupoles and sextupoles are for focusing and correct the chromaticity of the beam. From here knowing about the construction methods of these magnets through passing the road would a great point for every synchrotroon related industry. This is why after the successful fabrication and testing of the two first dipole prototype by ILSF [1], the detail design and construction of a prototype quadrupole magnet for the storage ring of the ILSF has been performed then.
3D simulation of the prototype quadrupole by RADIA.
For a 35 deg , 9mm deep cut on the edges of the poles, either effective length agrees with that from theory, or normalized integral field harmonics are reduced.
BASIC DESIGN
Using the two dimensional, magneto-static codes FEMM[1] and POISSON[2], a pole and yoke geometry was designed for the prototype quadrupole.
Normalized integral field harmonics for chamfered and un-chamfered Prototype quadrupole.
MECHANICAL DESIGN
1mm thick M A steel sheets were laser cut then to prepare the gap between laminations through the yoke to clamp the screws. All laminations were coated with electrical Insulating Varnish and then 20mm of tow end of each yoke is integrated with resin to make enough viscosity in the absence of the glue between laminations.
Stacking process was done under 50 bar uniform pressure applied by press machine and then clamped by tension bolts. The sheets were then put into the oven, once for 6 hours under the , and then for 4 hours with , to have the resin cured well.
Magnetic field lines of half of the quadrapole
The field quality within good field region and main parameters of the prototype quadrupole found through the simulation are presented .
Field quality
Quadrupole prototype mechanical design Quadrupole ready to be assembeled
Parameter
Units
Values
Pole tip Field-B0 T
0.54
Gradient-B'
T/m 18
Aperture radius mm 30
Good Field Region
±18
DB/B -
< 4×10-4
Mechanical Length
260
Total Amp-Turns Per Coil
A.t
97.5×68
Current density
A/m^2
4.1
Water Temperature Rise C 10
Cooling Water Speed
m/s
1.27
Voltage drop V 25
Pressure drop
bar
6.7
CONCLUSION
A quadrupole prototype was designed and fabricated for the first time in Iran by ILSF to improve the knowledge of magnets fabrication and pave the way for further investigations on more sophisticated multi pole magnets.
REFRENCES
[1]
[2] uspas.final.gov/PCprog
[3]
/Codes/ Radia/Radia
[4] Jack Tanabe, "Iron Dominated Electromagnets Design, Fabrication, Assembly and Measurements",SLAC-R-754, June 2005.
Main parameters
Acknowledgments: The authors wish to thank Prof. Helmut Wiedemann for his helpful discussions.