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G.V.Karpov, A.S.Medvedko, E.I.Shubin (Budker Institute of Nuclear Physics, Novosibirsk, Rus- sia)

Precise magnetometers on base of pulsed NMR technologies

A series of precise magnetometers on base of pulsed Nuclear Magnetic Resonance (NMR) tech- niques has been developed in BINP. In the range of 0.025÷13 T error of homogeneous magnetic fields measurements not exceeds (1÷2) ppm, resolution is better than 0.1 ppm. The magnetome- ters provide automatic search of NMR signal and tracking of the magnetic field. One type of the magnetometers is able to work with aluminum or copper powder as working substances of NMR probes. These probes can be used for measurements of magnetic fields at liquid helium tempera- ture. A special NMR probe with very small sensitive volume (about 1 mm3) has been designed to measure of fields with the gradient up to 150 G/cm. At present NMR magnetometers devel- oped and fabricated in BINP work successfully in some scientific centers in Russia and abroad. The features of the magnetometer's electronics design and more interesting examples of magne- tometer's application in charged particle storage rings are presented.

Dr. Gennady Viktorovich Karpov: karpovg@inp.nsk.su

V.G.Barkova, A.V.Kiselev, V.J.Chudaev (Budker Institute of Nuclear Physics, Novosibirsk, Russia)

Beam Energy Spread Measurement at the VEPP-4M Electron-positron Col- lider

The article presents rated data for analysis of efficiency of concrete shielding against slant pene- tration of bremsstrahlung of 5.0 MeV electrons with due account of the angle-energy distribu- tions of radiation from targets. Initial angle-energy distributions for aluminum, iron and tungsten targets have been obtained by direct Monte-Carlo simulation of interactions with the help of the program SCIN_PC. Then the value of air kerma was computed analytically and kerma attenua- tion by concrete shielding was estimated with application of available reference information. Kerma values at checkpoints behind the concrete shielding of the existing bench, which is in- tended mainly for electron accelerators of smaller energy, have been estimated. Bench operating restrictions for adjustment works with the ILU-10 accelerator have been formulated

Dr. Alexander Kiselev: A.V.Kiselev@inp.nsk.su

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