| Paper |
Title |
Page |
| MOPLT103 |
Radiation Resistant Magnetic Sensors for Accelerators
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773 |
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- I. Bolshakova, R. Holyaka
LPNU, Lviv
- S. Kulikov
JINR, Dubna, Moscow Region
- M. Kumada
NIRS, Chiba-shi
- C. Leroy
CERN, Geneva
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The technology of obtaining the radiation resistant magnetic sensors, which characteristics remain stable under the irradiation with high dose of fast neutrons was designed. Radiation resistant sensors are developed on the base of InSb. While irradiation with neutron flux of 1010 n*cm-2*c-1 with energies 0.1…13 MeV, with the thermal neutrons part in the general flux of 20% and intermediate fluxes of 25%, the main sensors’ characteristics, that is their sensitivity to the magnetic field, change no more than for 0.05% up to the fluence of 1*1015 n*cm-2 and no more than for 1% up to the fluence of 3*1016 n*cm-2. Radiation resistant sensors are used for development of magnetic field monitoring system with measuring channels accuracy of 0,01%, which have a function of temperature measurement with the accuracy of 0.1 С at the place of sensor location, moreover, it has self diagnostics and self correction functions. This system passed the long-term testing of continuous 3 months operation at the Neutron Physics Laboratory, JINR, Dubna at the IBR-2 neutron reactor.
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| WEPKF047 |
A Super Strong Adjustable Permanent Magnet for the Final Focus Quadrupole in a Linear Collider
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1708 |
| |
- T. Mihara, Y. Iwashita
Kyoto ICR, Uji, Kyoto
- E. Antokhin, M. Kumada
NIRS, Chiba-shi
- C.M. Spencer
SLAC, Menlo Park, California
- E. Sugiyama
NEOMAX Co., Ltd., Mishima-gun, Osaka
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A super strong magnet, which utilizes permanent magnet material and saturated iron, is considered as a candidate for the final focus quadrupole in a linear collider beamline. This modified Halbach magnet configuration can have a higher magnetic field gradient than a normal permanent magnet quadrupole (PMQ) or electromagnet. There are some issues to be solved if a PMQ is to be used as a final focus quadrupole: the variation of its strength with temperature and the need for the field strength to be deliberately changed. One can use special temperature compensation material to improve the temperature dependence with just a small decrease in field gradient compared to a magnet without temperature compensation. The required field variability can be obtained by slicing the magnet into pieces along the beamline direction and rotating these slices. Results of performance measurements on the PMQ with variable strength will be reported including the realization of the temperature compensation technique.
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