1,922 research outputs found
Experimental results and analysis from the 11 T Nb3Sn DS dipole
FNAL and CERN are developing a 5.5-m-long twin-aperture Nb3Sn dipole suitable
for installation in the LHC. A 2-m-long single-aperture demonstrator dipole
with 60 mm bore, a nominal field of 11 T at the LHC nominal current of 11.85 kA
and 20% margin has been developed and tested. This paper presents the results
of quench protection analysis and protection heater study for the Nb3Sn
demonstrator dipole. Extrapolations of the results for long magnet and
operation in LHC are also presented.Comment: 10 pages, Contribution to WAMSDO 2013: Workshop on Accelerator
Magnet, Superconductor, Design and Optimization; 15 - 16 Jan 2013, CERN,
Geneva, Switzerlan
A New Scintillator Tile/Fiber Preshower Detector for the CDF Central Calorimeter
A detector designed to measure early particle showers has been installed in
front of the central CDF calorimeter at the Tevatron. This new preshower
detector is based on scintillator tiles coupled to wavelength-shifting fibers
read out by multi-anode photomultipliers and has a total of 3,072 readout
channels. The replacement of the old gas detector was required due to an
expected increase in instantaneous luminosity of the Tevatron collider in the
next few years. Calorimeter coverage, jet energy resolution, and electron and
photon identification are among the expected improvements. The final detector
design, together with the R&D studies that led to the choice of scintillator
and fiber, mechanical assembly, and quality control are presented. The detector
was installed in the fall 2004 Tevatron shutdown and started collecting
colliding beam data by the end of the same year. First measurements indicate a
light yield of 12 photoelectrons/MIP, a more than two-fold increase over the
design goals.Comment: 5 pages, 10 figures (changes are minor; this is the final version
published in IEEE-Trans.Nucl.Sci.
Quench Performance of the First Pre-series AUP Cryo-assembly
The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) at CERN
will include eight cryo-assemblies that are expected to be fabricated and
delivered to CERN by the US HL-LHC Accelerator Upgrade Project (AUP) as part of
the U.S. contributions to the HL-LHC. These cryostat assemblies are the
quadrupole magnetic components of the HL-LHC Q1 and Q3 inner triplet optical
elements in front of the two interaction points. Each cryo-assembly consists of
two 4.2 m long Nb3Sn quadrupole magnets with aperture 150 mm and operating
gradient 132.6 T/m. The first pre-series cryo-assembly has been fabricated and
successfully tested at the horizontal test facility at Fermi National
Accelerator Laboratory. In this manuscript we report the quench test results of
the LQXFA/B-01 cryo-assembly. The primary objective of the horizontal test is
full cryo-assembly qualification and validation of the performance
requirements.Comment: MT28 International Conference on Magnet Technology, Accepted Versio
A Quench Detection and Monitoring System for Superconducting Magnets at Fermilab
A quench detection system was developed for protecting and monitoring the
superconducting solenoids for the Muon-to-Electron Conversion Experiment (Mu2e)
at Fermilab. The quench system was designed for a high level of dependability
and long-term continuous operation. It is based on three tiers: Tier-I,
FPGA-based Digital Quench Detection (DQD); Tier-II, Analog Quench Detection
(AQD); and Tier-3, the quench controls and data management system. The Tier-I
and Tier-II are completely independent and fully redundant systems. The Tier-3
system is based on National Instruments (NI) C-RIO and provides the user
interface for quench controls and data management. It is independent from Tiers
I & II. The DQD provides both quench detection and quench characterization
(monitoring) capability. Both DQD and AQD have built-in high voltage isolation
and user programmable gains and attenuations. The DQD and AQD also includes
user configured current dependent thresholding and validation times.
A 1st article of the three-tier system was fully implemented on the new
Fermilab magnet test stand for the HL-LHC Accelerator Up-grade Project (AUP).
It successfully provided quench protection and monitoring (QPM) for a cold
superconducting bus test in November 2020. The Mu2e quench detection design has
since been implemented for production testing of the AUP magnets. A detailed
description of the system along with results from the AUP superconducting bus
test will be presented
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