Speaker
Description
The High Luminosity upgrade of the Large Hadron Col
lider (HL-LHC) project aims to increase the integrated lu
minosity by an order of magnitude over the LHC’s original
design specifications. To achieve this objective, strict control
of the alignment of the new Inner Triplet superconducting
magnets installed around the ATLAS and CMS interaction
points is essential. This is provided by the Full Remote
Alignment System (FRAS), a three-dimensional alignment
system providing micrometric measurements at one second
acquisition rate, designed specifically for the HL-LHC pro
ject.
In preparation for the required performance of the HL
LHC, the Inner Triplet String (IT String) Test test-stand has
been implemented. This test facility replicates the new in
ner triplet region of the HL-LHC, offering the opportunity
to test the combined performance of its critical compon
ents and to gain first operational experience. As part of
this, FRAS has been deployed and commissioned on the
IT String to position the six main cryoassemblies within a
±0.1 mm (1σ) cylindrical tolerance zone relative to their
nominal positions. This paper presents the operational ex
perience and performance of FRAS on the IT String, not
only in alignment mode but across different use cases such
as vacuum pumping, cooldown and powering tests during
the main hardware commissioning phase.
