Instrumentation & Measurement Magazine 24-9 - 44

Fig. 5. Distribution of forces and currents induced in the tungsten blocks during the oscillation of the non-monotonic phase in (left) and the monotonic phase in
(right).
points distributed along three different sections of the beam
screen, optical fibers to measure axial and transversal strains
on the outer surface of the cold bore, and three custom made
probes to integrate the previously described displacement sensors
in order to measure the expansion of the beam screen, the
tilt of the tungsten alloy heat absorber during the CLIQ phase
and the magnetic field.
Special probes were developed to measure the expansion
of the beam screen (single pin side) and the tilt of the tungsten
blocks (double pin side). In addition, pick-up coils were
mounted in the central probe to measure the magnetic field
and have further data to analyze the mechanical response of
the beam screen, as shown in Fig. 6. Two strain gauges to compensate
the signals of all the probes were installed on two
free-pin strips of the upper probe.
The structure of the probe is made of G-11 FR-5 glass fiber reinforced
plastic and is designed to be auto-equilibrated within
the beam screen by means of the displacement sensors whose
pins push against the inside of the beam screen or tungsten alloy
heat absorbers (Fig. 6). Eight sensors are mounted in the
probe: four for each side. The expansion of the beam screen is
measured by the side of the probe where there are single strips.
The tilt of the heat absorber is measured by the other side of the
probe where two strips are placed next to each other in its upper
and bottom side. Additionally, two identical displacement
sensors located in two perpendicular faces of the central probe
at 45° with respect to the poles of the magnet and non-mechanically
connected to the structure are included in the set-up in
order to ascertain the effect of the magnetic fields in the sensors.
This mechanical configuration is much less favorable
than the one for the rest of the sensors, as the sensors nonmechanically
connected to the structure are cantilevered,
while the sensors used for the determination of the expansion
of the beam-screen and the tilt of the tungsten sensors are
Fig. 6. (a) Probe with displacement sensors and pick-up coils. (b) Expansion and tilt measurement configuration.
44
IEEE Instrumentation & Measurement Magazine
December 2021

Instrumentation & Measurement Magazine 24-9

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