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View article: Dendrochronological study of wooden constructions unearthed from a subalpine peat bog from Maramureș Mts, Romania
Dendrochronological study of wooden constructions unearthed from a subalpine peat bog from Maramureș Mts, Romania Open
Two simple wooden constructions were found in a peat bog, called ‘Vinderel 3’, located in the Maramureș Mts. (Romania). They were constructed from spruce timber and a 67-year-long floating chronology, called MM8, was developed using the cr…
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: Test Stand Functional Requirements for Testing MQXFA Magnets and Q1/Q3 Cryostat Assemblies (Rev.3)
Test Stand Functional Requirements for Testing MQXFA Magnets and Q1/Q3 Cryostat Assemblies (Rev.3) Open
This document specifies test stand requirements for testing the High Luminosity LHC (HL-LHC, or HiLumi LHC) MQXFA magnets and LQXFA/B cryostat assemblies. Total of 12 (3 pre-series, 7 series production and 2 re-work) of these cryostat asse…
View article: AUP First Pre-Series Cryo-Assembly Design Production and Test Overview
AUP First Pre-Series Cryo-Assembly Design Production and Test Overview Open
New high field and large-aperture quadrupole magnets for the low-beta inner triplets (Q1, Q2, Q3) have been built and tested as part of the high-luminosity upgrade of the Large Hadron Collider (HL-LHC). These new quadrupole magnets are bas…
View article: Quench Performance of the First Pre-Series AUP Cryo-Assembly
Quench Performance of the First Pre-Series AUP Cryo-Assembly Open
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. co…
View article: Fermilab's Horizontal Test Stand Upgrade Overview and Commissioning
Fermilab's Horizontal Test Stand Upgrade Overview and Commissioning Open
Cryo-assemblies with the Nb3 Sn MQXFA low-beta quadrupoles for the High Luminosity LHC (HL-LHC) upgrade will be tested at Fermilab's magnet test facility. A total of 10 cryo-assemblies will be delivered to CERN within the US HL-LHC Acceler…
View article: Effect of CLIQ on Training of HL-LHC Quadrupole Magnets
Effect of CLIQ on Training of HL-LHC Quadrupole Magnets Open
The high-luminosity LHC upgrade requires stronger than LHC low-beta quadrupole magnets to reach the luminosity goals of the project. The project is well advanced and HL-LHC quadrupole magnets are currently being commissioned in US Labs (MQ…
View article: Magnetic Measurements and Alignment Results of LQXFA/B Cold Mass Assemblies at Fermilab
Magnetic Measurements and Alignment Results of LQXFA/B Cold Mass Assemblies at Fermilab Open
MQXFA production series quadrupole magnets are being built for the Hi-Lumi (HL) LHC upgrade by the US Accelerator Upgrade Project (US-HL-LHC AUP). These magnets are being placed in pairs, as a cold mass, within cryostats at Fermilab, and a…
View article: Magnetic Measurements and Alignment Results of LQXFA/B Cold Mass Assemblies at Fermilab
Magnetic Measurements and Alignment Results of LQXFA/B Cold Mass Assemblies at Fermilab Open
MQXFA production series quadrupole magnets are being built for the Hi-Lumi (HL) LHC upgrade by the U.S. Accelerator Upgrade Project (US-HL-LHC AUP). These magnets are being placed in pairs, as a cold mass, within cryostats at Fermilab, and…
View article: Fermilab’s horizontal test stand upgrade overview and commissioning
Fermilab’s horizontal test stand upgrade overview and commissioning Open
Cryo-assemblies with the low-beta Nb3Sn quadrupoles for the High Luminosity LHC (HL-LHC) upgrade will be tested at Fermilab’s magnet test facility. Total of 10 cryo-assemblies will be delivered to CERN within the US HL-LHC Accelerator Upgr…
View article: FNAL test facility
FNAL test facility Open
magnetic fields and wide range of temperatures. Complementary, this facility will be used to test high-field super-conducting magnet models and demonstrators, including hybrid magnets, produced by the US Magnet Development Program (MDP). T…
View article: Experience from the US contribution to HL-LHC: Nb3Sn focusing quadrupoles and SRF crab cavities
Experience from the US contribution to HL-LHC: Nb3Sn focusing quadrupoles and SRF crab cavities Open
The Interaction Regions (IR) of many colliders benefit from the application of leading-edge technologies to ensure the highest possible luminosity delivered to the experiments. Leading-edge low-beta focusing magnets and crab cavities to ha…
View article: Status of MQXFB quadrupole magnets for HL-LHC
Status of MQXFB quadrupole magnets for HL-LHC Open
The MQXFB magnets are superconducting quadrupoles with nominal peak field on the conductor of 11.3 T. With their magnetic length of 7.2 m, they stand as the longest Nb3Sn accelerator magnets designed and manufactured up to now. Together wi…
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: Effect of CLIQ on training of HL-LHC quadrupole magnets
Effect of CLIQ on training of HL-LHC quadrupole magnets Open
The high-luminosity LHC upgrade requires stronger than LHC low-beta magnets to reach the luminosity goals of the project. The project is well advanced and HL-LHC quadrupole magnets are currently being commissioned in US Labs (MQXFA magnets…
View article: C1Po2D-04: Cryogenic Testing of the First HL-LHC Q1/Q3 Cryo-Assembly at
C1Po2D-04: Cryogenic Testing of the First HL-LHC Q1/Q3 Cryo-Assembly at Open
In early 2023, Fermilab is conducting horizontal cryogenic testing of the first Q1/Q3 Cryo-Assembly for the high-luminosity LHC upgrade (HL-LHC). The Cryo-Assembly was installed on the upgraded Fermilab horizontal test stand previously use…
View article: Cryogenic testing of the first HL-LHC Q1/Q3 cryo-assembly at Fermilab
Cryogenic testing of the first HL-LHC Q1/Q3 cryo-assembly at Fermilab Open
In early 2023, Fermilab is conducting horizontal cryogenic testing of the first Q1/Q3 cryo-assembly for the high-luminosity LHC upgrade (HL-LHC). The cryo-assembly was installed on the upgraded Fermilab horizontal test stand previously use…
View article: Experience from the US Contribution to HL-LHC: Nb3Sn Focusing Quadrupoles and SRF Crab Cavities
Experience from the US Contribution to HL-LHC: Nb3Sn Focusing Quadrupoles and SRF Crab Cavities Open
The Poster reports the progress from the AUP Project for the construction of HL-LHC Nb3Sn Quadrupoles and SRF Crab Cavities.
View article: Acceptance Criteria Part B: LMQXFA cold mass and cryo-assembly
Acceptance Criteria Part B: LMQXFA cold mass and cryo-assembly Open
This document specifies the acceptance criteria for the LMQXFA cold mass and cryoassembly. If all the requirements specified in this document are met, then the U.S. HL-LHC AUP LMQXFA and LQXFA deliverables will be accepted by Please note t…
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: Application of Distributed Fiber Optic Strain Sensors to LMQXFA Cold Mass Welding
Application of Distributed Fiber Optic Strain Sensors to LMQXFA Cold Mass Welding Open
to obtain a strain map over a wide area of a Nb3Sn magnet cold mass shell. Data were collected during welding of the first LMQXFA cold mass and the results confirm that the increase of the coil pole azimuthal pre-stress after welding do no…
View article: Commissioning, Performance, and Effect of the Quench Current-Boosting Device on a Dedicated Superconducting Magnet
Commissioning, Performance, and Effect of the Quench Current-Boosting Device on a Dedicated Superconducting Magnet Open
Superconducting magnet training is one of the accelerator related issues attracting attention due to significant operational costs and time budget associated to it. It is especially worrisome that magnets based on the “next-generation” Nb3…
View article: Application of Distributed Fiber Optic Strain Sensors to LMQXFA Cold Mass Welding
Application of Distributed Fiber Optic Strain Sensors to LMQXFA Cold Mass Welding Open
The future High Luminosity upgrade of the Large Hadron Collider (HL-LHC) at CERN will include the low-beta inner triplets (Q1, Q2a/b, Q3) for two LHC insertion regions. The Q1, Q3 components consist of eight 10 m-long LMQXFA cryo-assemblie…
View article: Fabrication of the Fermilab Pre-Series Cold Mass for the HL-LHC Accelerator Upgrade Project
Fabrication of the Fermilab Pre-Series Cold Mass for the HL-LHC Accelerator Upgrade Project Open
Fermilab is fabricating ten full length cold masses for the high-luminosity Large Hadron Collider Accelerator Upgrade Project (HL-LHC AUP). One practice assembly and one pre-series assembly have been completed. Here this paper summarizes t…
View article: Jet azimuthal decorrelation studies with the D0 detector
Jet azimuthal decorrelation studies with the D0 detector Open
Experimental results on the measurement of the azimuthal decorrelation between jets with pseudorapidity separation up to five units are presented. The data were taken at the Fermi National Accelerator Laboratory during the 1992-1993 collid…
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: Status of the MQXFB Nb<sub>3</sub>Sn Quadrupoles for the HL-LHC
Status of the MQXFB Nb<sub>3</sub>Sn Quadrupoles for the HL-LHC Open
The cold powering test of the first two prototypes of the MQXFB quadrupoles (MQXFBP1, now disassembled, and MQXFBP2), the Nb3Sn inner triplet magnets to be installed in the HL-LHC, has validated many features of the design, such as field q…
View article: MQXFA Magnet Handling & Shipping Requirements
MQXFA Magnet Handling & Shipping Requirements Open
This Technical note defines the MQXFA Magnet handling and shipping requirements for the US HL-LHC Accelerator Upgrade Project (AUP).
View article: Magnetic Measurements of HL-LHC AUP Cryo-Assemblies at Fermilab
Magnetic Measurements of HL-LHC AUP Cryo-Assemblies at Fermilab Open
LQXFA/B production series cryogenic assemblies are being built for the LHC upgrade by the HL-LHC Accelerator Upgrade Project (AUP). These contain a pair of MQXFA quadrupole magnets combined as a cold mass within a vacuum vessel, and are to…