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Abstract
| The future high luminosity upgrade of the Large
Hadron Collider (LHC) at CERN will include 20 4.2-m-long Nb$_3$Sn
high gradient quadrupole magnets, which will be components of
the triplets for two LHC insertion regions. In order to test these
and four preproduction models, the vertical superconducting magnet test facility of the Superconducting Magnet Division (SMD) at
Brookhaven National Laboratory (BNL) has been upgraded to perform testing in superfluid He at 1.9 K and 1 bar, the operational
condition at the LHC. This has involved extensive modification
of the 4.5 K cryogenics plant, including piping, compressors, and
other upgraded components; a new vertical test cryostat, which
can accept larger diameter magnets; a modernized power supply
system upgraded with IGBT switches and fast shutoff capability,
and that can supply 24 kA to test high field Nb$_3$Sn magnets; and
completely new data acquisition, signal analysis, and control software and hardware, allowing for fast, high precision, large volume
data collection. This paper reports on the design, assembly, and
commissioning of this upgraded test facility, and presents results
of the first magnet test performed. |