D. W. Cheng
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View article: First results of AUP Nb3Sn quadrupole horizontal tests
First results of AUP Nb3Sn quadrupole horizontal tests Open
The Large Hadron Collider will soon undergo an upgrade to increase its luminosity by a factor of ~10. A crucial part of this upgrade will be replacement of the NbTi final focus magnets with Nb3Sn magnets that achieve a ~50% increase in the…
View article: Analysis of the MQXFA Low Beta Quadrupoles for HL-LHC after 50% magnet assembly complete +
Analysis of the MQXFA Low Beta Quadrupoles for HL-LHC after 50% magnet assembly complete + Open
The US HL-LHC Accelerator Upgrade Project (AUP) is fabricating the MQXFA magnets to be used in the Q1 and Q3 Inner Triplet elements of the High Luminosity LHC (HL-LHC). This is the first production of Nb3Sn magnets for a particle accelerat…
View article: Challenges and Lessons Learned From Fabrication, Testing, and Analysis of Eight MQXFA Low Beta Quadrupole Magnets for HL-LHC
Challenges and Lessons Learned From Fabrication, Testing, and Analysis of Eight MQXFA Low Beta Quadrupole Magnets for HL-LHC Open
By the end of October 2022, the US HL-LHC Accelerator Upgrade Project (AUP) had completed fabrication of ten MQXFA magnets and tested eight of them. The MQXFA magnets are the low-beta quadrupole magnets to be used in the Q1 and Q3 Inner Tr…
View article: Analysis of the mechanical performance of the 4.2 m long MQXFA magnets for the Hi-Lumi LHC Upgrade
Analysis of the mechanical performance of the 4.2 m long MQXFA magnets for the Hi-Lumi LHC Upgrade Open
Under the U.S. High Luminosity LHC Accelerator Upgrade Project (HL-LHC AUP), the 150 mm bore, high-field Nb3Sn low-\b{eta} MQXFA quadrupole magnets are being fabricated, assembled and tested, in the context of the CERN Hi-Luminosity LHC (H…
View article: Analysis of the Mechanical Performance of the 4.2-m-Long MQXFA Magnets for the Hi-Lumi LHC Upgrade
Analysis of the Mechanical Performance of the 4.2-m-Long MQXFA Magnets for the Hi-Lumi LHC Upgrade Open
Under the U.S. High Luminosity LHC Accelerator Upgrade Project (HL-LHC AUP), the 150 mm bore, high-field Nb3Sn low-{eta}_MQXFA quadrupole magnets are being fabricated, assembled and tested, in the context of the CERN Hi-Luminosity LHC (HL-…
View article: The Challenges and Solutions of Meeting the Assembly Specifications for the 4.5 m Long MQXFA Magnets for the Hi-Luminosity LHC
The Challenges and Solutions of Meeting the Assembly Specifications for the 4.5 m Long MQXFA Magnets for the Hi-Luminosity LHC Open
The U.S. High-Luminosity LHC Accelerator Upgrade Project (HL-LHC AUP) has, in the recent years, developed assembly specifications for the 4.5 m long MQXFA magnets, which are 150 mm aperture high-field Nb3Sn low-β quadrupole magnets that ar…
View article: Optimizing the use of pressurized bladders for the assembly of HL-LHC MQXFB magnets
Optimizing the use of pressurized bladders for the assembly of HL-LHC MQXFB magnets Open
The use of pressurized bladders for stress control of superconducting magnets was firstly proposed at Lawrence Berkeley National Laboratory in the early 2000s. Since then, the so-called ‘bladders and keys’ procedure has become one of the r…
View article: Applied Metrology for the Assembly of the Nb<sub>3</sub>Sn MQXFA Quadrupole Magnets for the HL-LHC AUP
Applied Metrology for the Assembly of the Nb<sub>3</sub>Sn MQXFA Quadrupole Magnets for the HL-LHC AUP Open
The US HL-LHC Accelerator Upgrade Project (AUP) is building Nb3Sn quadrupole magnets, called MQXFA, with plans to install 16 of them in the HL-LHC Interaction Regions. Variability in coil size must be dealt with at the assembly level, whic…
View article: Status and Challenges of the Interaction Region Magnets for HL-LHC
Status and Challenges of the Interaction Region Magnets for HL-LHC Open
About one hundred magnets of six different types shall be installed in the High Luminosity LHC (HL-LHC) in the years 2026-2028 at CERN. The magnets design, construction and test are based on CERN collaborations with institutes and industri…
View article: MQXFA Series Magnet Production Specification: US HL-LHC Accelerator Upgrade Project
MQXFA Series Magnet Production Specification: US HL-LHC Accelerator Upgrade Project Open
The purpose of this document is to define the specifications for the structure fabrication and assembly of MQXFA series magnets to be used by the US High-Luminosity LHC Accelerator Upgrade Project (AUP). Magnets fabricated according to the…
View article: MQXFA Final Design Report
MQXFA Final Design Report Open
The MQXFA Quadrupole magnets will be installed in High Luminosity LHC to form the Q1 and Q3 inner triplet optical elements in front of the interaction points 1 (ATLAS) and 5 (CMS). A pair of MQXFA units is assembled in a stainless steel he…
View article: Field Quality of the 4.5-m-Long MQXFA Pre-Series Magnets for the HL-LHC Upgrade as Observed During Magnet Assembly
Field Quality of the 4.5-m-Long MQXFA Pre-Series Magnets for the HL-LHC Upgrade as Observed During Magnet Assembly Open
The U.S. High-Luminosity LHC Accelerator Upgrade Project (HL-LHC AUP) is developing MQXFA magnets, a series of 4.5 m long 150 mm aperture high-field Nb$_3$Sn quadrupole magnets for the HL-LHC upgrade at CERN. Five pre-series magnets, MQXFA…
View article: Assembly and Pre-Loading Specifications for the Series Production of the Nb<sub>3</sub>Sn MQXFA Quadrupole Magnets for the HL-LHC
Assembly and Pre-Loading Specifications for the Series Production of the Nb<sub>3</sub>Sn MQXFA Quadrupole Magnets for the HL-LHC Open
The High Luminosity LHC (HL-LHC) Project is planning to install 16 cold-masses made with Nb3Sn quadrupole magnets in the LHC Interaction Regions to significantly increase its luminosity. Half of these cold masses are fabricated at BNL, FNA…
View article: Optimization and test of a 120mm LARP Nb3Sn quadrupole coil using magnetic mirror structure
Optimization and test of a 120mm LARP Nb3Sn quadrupole coil using magnetic mirror structure Open
The US-LARP collaboration is developing a new generation of large-aperture high-field quadrupoles based on Nb{sub 3}Sn superconductor for the LHC upgrades. The development and implementation of this new technology involves the fabrication …
View article: Test Results of the First Pre-Series Quadrupole Magnets for the LHC Hi-Lumi Upgrade
Test Results of the First Pre-Series Quadrupole Magnets for the LHC Hi-Lumi Upgrade Open
The future high luminosity (Hi-Lumi) upgrade of the Large Hadron Collider (LHC) at CERN will include eight (plus two spares) 10.2 m-long Cryo-assemblies which will be components of the triplets for two LHC insertion regions. Each cold mass…
View article: Mechanical Comparison of Short Models of Nb<sub>3</sub> Sn Low-β Quadrupole for the Hi-Lumi LHC
Mechanical Comparison of Short Models of Nb<sub>3</sub> Sn Low-β Quadrupole for the Hi-Lumi LHC Open
MQXF is the Nb3 Sn Low-β quadrupole magnet that the HL-LHC project is planning to install in the LHC interaction regions in 2026 to increase the LHC integrated luminosity. Furthermore, the magnet will be fabricated in two different lengths…
View article: Lessons Learned From the Prototypes of the MQXFA Low-Beta Quadrupoles for HL-LHC and Status of Production in the US
Lessons Learned From the Prototypes of the MQXFA Low-Beta Quadrupoles for HL-LHC and Status of Production in the US Open
With the successful test of the first two pre-series magnets the US HL-LHC Accelerator Upgrade Project has started production of the MQXFA magnets to be used in Q1/Q3 inner triplet elements of the HL-LHC. This good start comes after the te…
View article: Magnetic Field Measurements of First Pre-series Full-Length 4.2 m Quadrupole MQXFA03 Using PCB Rotating Coils for the Hi-Lumi LHC Project
Magnetic Field Measurements of First Pre-series Full-Length 4.2 m Quadrupole MQXFA03 Using PCB Rotating Coils for the Hi-Lumi LHC Project Open
The U.S. Hi-Lumi LHC Accelerator Upgrade Project (AUP) and CERN have joined efforts to develop high field quadrupoles for the Hi-Lumi LHC upgrade. The US national laboratories in the AUP project will deliver 10 magnets and each cryostat ha…
View article: Erratum to “The HL-LHC Low-β Quadrupole Magnet MQXF: From Short Models to Long Prototypes” [Aug 19 Art. no. 4001309]
Erratum to “The HL-LHC Low-β Quadrupole Magnet MQXF: From Short Models to Long Prototypes” [Aug 19 Art. no. 4001309] Open
Presents corrections to author information for the above named paper.
View article: Test Results of the First Two Full-Length Prototype Quadrupole Magnets for the LHC Hi-Lumi Upgrade
Test Results of the First Two Full-Length Prototype Quadrupole Magnets for the LHC Hi-Lumi Upgrade Open
The future high luminosity (Hi-Lumi) upgrade of the Large Hadron Collider (LHC) at CERN will include eight (plus two spares) 8.4 m-long cryostatted cold masses which will be components of the triplets for two LHC insertion regions. Each co…
View article: Preload Characterization of Short Models of MQXF the Nb<sub>3</sub>Sn Low-β Quadrupole for the Hi-Lumi LHC
Preload Characterization of Short Models of MQXF the Nb<sub>3</sub>Sn Low-β Quadrupole for the Hi-Lumi LHC Open
MQXF is the Nb3Sn Low-β Quadrupole magnet that the HL-LHC project is planning to install in the LHC interaction regions in 2026 as part of an upgrade to increase the LHC inte-grated luminosity by about a factor of ten. The magnet will be f…
View article: Fracture Failure Analysis for MQXFA Magnet Aluminum Shells
Fracture Failure Analysis for MQXFA Magnet Aluminum Shells Open
The High-Luminosity LHC Accelerator Upgrade Project (HL-LHC AUP) is approaching the production phase of the US-contributed Q1 and Q3 Interaction Region Quadrupoles (MQXFA). The structures for the MQXFA prototypes were design and inspected …
View article: Mechanical Performance of the First Two Prototype 4.5 m Long Nb<sub>3</sub>Sn Low-β Quadrupole Magnets for the Hi-Lumi LHC Upgrade
Mechanical Performance of the First Two Prototype 4.5 m Long Nb<sub>3</sub>Sn Low-β Quadrupole Magnets for the Hi-Lumi LHC Upgrade Open
The U.S. High-Luminosity LHC Accelerator Upgrade Project (HL-LHC AUP) team is collaborating with CERN in the design and fabrication of the first 4.5 m long MQXFA magnets, a 150 mm aperture high-field Nb3Sn quadrupole magnet that uses the a…
View article: Engineering Specification: MQXFA Magnet Interface Specification
Engineering Specification: MQXFA Magnet Interface Specification Open
This specification defines the mechanical and electrical interfaces of the MQXFA magnets, which are relevant for the incorporation of these elements into the LMQXFA cold mass assembly, and subsequently into the cryostat which completes the…
View article: Failure Assessments for MQXF Magnet Support Structure With a Graded Approach
Failure Assessments for MQXF Magnet Support Structure With a Graded Approach Open
The High-Luminosity Large Hadron Collider (HLLHC) upgrade requires new quadrupoles, MQXF, to replace the present LHC inner triplets. The MQXFA magnet is the first prototype that has a 150 mm aperture and uses Nb3Sn superconducting technolo…
View article: Summary of the Mechanical Performances of the 1.5 m Long Models of the Nb<inline-formula> <tex-math notation="LaTeX">$_{3}$</tex-math> </inline-formula>Sn Low-<inline-formula> <tex-math notation="LaTeX">$\beta$</tex-math> </inline-formula> Quadrupole MQXF
Summary of the Mechanical Performances of the 1.5 m Long Models of the NbSn Low- Quadrupole MQXF Open
The Nb3Sn quadrupole MQXF is being developed as a part of the large hadron collide (LHC) High Luminosity upgrade. The magnet design was tested on 1.5-m-long short models, sharing the same cross section with the full-length magnets. Various…
View article: Field Quality of HD3—A Nb<inline-formula> <tex-math notation="LaTeX">$_3$</tex-math> </inline-formula>Sn Dipole Magnet Based on Block Design
Field Quality of HD3—A NbSn Dipole Magnet Based on Block Design Open
HD3 is the latest magnet of a series of block-type Nb 3 Sn dipole model magnets developed by the Superconducting Magnet Program at Lawrence Berkeley National Laboratory. The magnet is 1 m long with a clear aperture of 43 mm. As a model mag…
View article: The HL-LHC Low-β Quadrupole Magnet MQXF: From Short Models to Long Prototypes
The HL-LHC Low-β Quadrupole Magnet MQXF: From Short Models to Long Prototypes Open
In order to reduce the beam size by a factor two in the inter-action points, and to increase the rate of collisions by a factorof five, the HL-LHC Project [1] is planning to install in the LHC Interaction Regions (IR) new inner triplet (or…
View article: Field Quality Measurement of a 4.2-m-Long Prototype Low-<inline-formula> <tex-math notation="LaTeX">$\beta$</tex-math> </inline-formula> Nb<inline-formula> <tex-math notation="LaTeX">$_3$</tex-math> </inline-formula>Sn Quadrupole Magnet During the Assembly Stage for the High-Luminosity LHC Accelerator Upgrade Project
Field Quality Measurement of a 4.2-m-Long Prototype Low- NbSn Quadrupole Magnet During the Assembly Stage for the High-Luminosity LHC Accelerator Upgrade Project Open
The U.S. High-Luminosity LHC Accelerator Upgrade Project, in collaboration with CERN, is developing NbSn quadrupole magnets (MQXFA) to be installed at the interaction region of the LHC. The project will deliver 20 MQXFA magnets in 10 cold …