A stretch wire magnetometer is a versatile instrument and
can be treated as the primary standard of magnetic qualification of
accelerator magnets. Bhabha Atomic Research Centre has developed a
Stretch wire magnetic measurement system to cater to the
requirements of magnetic measurements on accelerator magnets. This
bench also includes a vibrating wire system. The scheme used in this
instrument for measurements of magnetic flux ensures drift
compensations after each scan. This feature along with post-signal
processing gives an accuracy of homogeneity measurements comparable
to that of a rotating coil magnetometer. Unlike conventional stretch
wire systems, wire moves in the r-z plane (along r-axis) at
different azimuthal angles. This provides the opportunity for drift
compensation at each scan. This has immensely enhanced the
measurement accuracy of non-homogeneity of integral fields to less
than 3 units. The same is cross-verified with a rotating coil
system. The comparison between rotating coil and stretch wire is
presented. The Paper gives the step-wise procedure for the
measurement of key performance indicators of an accelerator
magnet. This paper brings out salient features of the system along
with design and calibration results.
The fluxgate magnetometer principle of second harmonic detection is applied for designing a DC Current Transformer (DCCT) based magnetic sensor for accurate measurement of beam currents in proton accelerators .This paper presents the most suitable magnetic material which can be used as the core. It also gives the geometrical model of the magnetic sensor with exact values for its height, outer radius, inner radius and the number of turns in the sensor winding. The magnitude of the AC excitation current along with its frequency is also mentioned. The sensor voltages and the second harmonic components obtained for different values of DC beam currents have been analyzed for a variety of magnetic core materials. A highly linear sensor characteristics with sensitivity in the order of 3V/A is obtained with the usage of Vitrovac 6025 Z as the core material for the modeled sensor.
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