Instrumentation & Measurement Magazine 24-9 - 45

Fig. 7. Measurement and simulation results for a 8.2 kA quench. (a) Expansion of the beam screen together with B. (b) Tilt of the tungsten alloy heat absorber in
together with B.
cantilevered in one side, and simply supported in the opposite.
For this reason, the readings of the sensors non-mechanically
connected to the structure are considered the worst-case
scenario for the spurious effect of the magnetic fields in the
sensors used for the actual measurements.
A selection of the results obtained during the campaign
is presented in Fig. 7. Specifically, the plots display the measurements
performed during a quench at 8.2 kA. A maximum
expansion of 0.1 mm in the monotonic phase can be observed
in Fig. 7a, which is in agreement with the magnetic measurement
and the simulations. Fig. 7b shows the tilt angle of the
tungsten alloy heat absorbers
measured by the probe
during the initial current
oscillations of CLIQ. i.e.,
up to 0.1 s at 8.2 kA. The
highest tilt angle is around
2° counter clockwise and it
occurs at around 5 ms. The
following tilts are less intense
as the B difference
between consecutive poles
decreases as well. There
is around a factor 2 difference
in comparison with
the simulations.
Fig. 8 compares the displacements
measured by
sensors not mechanically
connected to the beamscreen,
and mechanically
connected to the beamscreen
during a quench at
8.2 kA. While the probes
display a certain apparent
December 2021
displacement during the non-monotonic phase of the measurement,
the value of the spurious displacement measured remains
in all the cases under 10% of the displacement measured by the
rest of the sensors, not hindering the exploitation of the data.
Conclusion
The sensors presented in this paper have experimentally
proved to be a reliable tool for displacement measurements
at ultra-low temperatures in the presence of intense electromagnetic
fields. The simplicity of their design and functioning
principle make the process of tailoring this kind of sensor to
Fig. 8. Displacements measured by sensors not mechanically connected to the beam-screen (blue lines) and sensors
mechanically connected to the beam screen (yellow lines) at 8.2 kA together with B.
IEEE Instrumentation & Measurement Magazine
45

Instrumentation & Measurement Magazine 24-9

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