Instrumentation & Measurement Magazine 24-9 - 36

of RSG down to 1.9 K. The
performance testing of FBG
sensors is done thanks to a
mirror instrumentation of
the short model LTS magnet's
coils, as shown in Fig.
2a. Optical and electrical
strain gauges are bonded
in both azimuthal T and
longitudinal Z directions.
Fig. 2b shows the external
compensator used for RSG
measurements.
Agreement Study
between Electrical
and Optical Sensors
LTS magnets should satisfy
strict performance
requirements that are measured
during cold testing
in the SM18 facility [7],
CERN's test facility for superconducting
magnets
and radio-frequency cavities
[8]. Short models of
LTS magnets, with a magnetic
length of 1.2 m, are
immerged in a vertical
test cryostat where they
can be tested in liquid Helium
from 1.8 K to 4.5 K
[9]. Once the magnets are
in the test benches and at
1.9 K, the magnets were
powered up to an ultimate
current level [10]. The
agreement study was performed
on different short
models of LTS equipped
with both electrical and
optical sensors. The RSG
were measured with the
QuantumX MX1615 module
provided by HBK®.
The QuantumX CX27 gateway
module was used to
enable time synchronization
between the MX1615
module and the FS22DI
optical interrogator. Fig. 3
shows the azimuthal strain
measurements obtained
during one powering test
at 1.9 K. For each powering
test and each coil, linear
36
Fig. 4. Optical fiber feedthrough schematic and picture of the different parts.
Fig. 5. Experimental set-up to evaluate the optical signal transmission with the optical feedthrough at 4 K.
IEEE Instrumentation & Measurement Magazine
December 2021

Instrumentation & Measurement Magazine 24-9

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