A5091672054- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Physics of Superconductivity and Magnetism
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Superconductivity in MgB2 and Alloys
- Gyrotron and Vacuum Electronics Research
- HVDC Systems and Fault Protection
- Electromagnetic Scattering and Analysis
- High voltage insulation and dielectric phenomena
- Crystal Structures and Properties
- Advanced Thermoelectric Materials and Devices
- Solid-state spectroscopy and crystallography
- Spacecraft and Cryogenic Technologies
- Cancer-related molecular mechanisms research
- Advanced Measurement and Detection Methods
- Bone and Joint Diseases
- Semiconductor Quantum Structures and Devices
- Advanced Condensed Matter Physics
- Particle Detector Development and Performance
- RNA regulation and disease
- Engineering Applied Research
- Remote Sensing and LiDAR Applications
- Radiation Effects in Electronics
Lawrence Berkeley National Laboratory
2014-2023
Fermi National Accelerator Laboratory
2016-2023
Brookhaven National Laboratory
2023
Charles Humbert 8
2023
Tianjin Hi-Tech Superconducting Electronic Technology (China)
2020
Tianjin University of Technology and Education
2015
Jilin University
2010-2013
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
2010-2013
Fusion Academy
2009
Showa Corporation
2009
The High Luminosity (HiLumi) Large Hadron Collider (LHC) project has, as the main objective, to increase LHC peak luminosity by a factor five and integrated ten. This goal will be achieved mainly with new interaction region layout, which allow stronger focusing of colliding beams. target reduce beam size in points two, requires doubling aperture low- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...
Repetitive, low-intensity loading from normal daily activities can generate fatigue damage in trabecular bone, a potential cause of spontaneous fractures the hip and spine. Finite element models bone (Guo et al., 1994) suggest that both creep slow crack growth contribute to failure. In an effort characterize these mechanisms experimentally, we conducted tests on 85 waisted specimens obtained 76 bovine proximal tibiae. All applied stresses were normalized by previously measured specimen...
The high luminosity LHC (HL-LHC) project is aimed at studying and implementing the necessary changes in to increase its by a factor of five. Among magnets that will be upgraded are 16 superconducting low-β quadrupoles placed around two interaction regions (ATLAS CMS experiments). In current baseline scenario, these quadrupole have generate gradient 140 T/m coil aperture 150 mm. resulting conductor peak field more than 12 T require use Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Canted–Cosine–Theta (CCT) magnet is an accelerator that superposes fields of nested and tilted solenoids are oppositely canted. The current distribution any canted layer generates a pure harmonic field as well solenoid can be cancelled with similar but layer. concept places windings within mandrel's ribs spars simultaneously intercept guide Lorentz forces each turn to prevent stress accumulation. With respect other designs, the need for pre-stress in this reduced by order magnitude making it...
Sub-scale coils are being manufactured and tested at Lawrence Berkeley National Laboratory in order to develop wind-and-react Bi 2 Sr CaCu O x (Bi-2212) magnet technology for future graded accelerator use. Previous Bi-2212 showed significant leakage of the conductors' core constituents environment, which can occur during partial melt reaction around 890°C pure oxygen. The main origin observed is intrinsic wires, issue therefore addressed wire manufacturing level. We report on further...
Among the components to be upgraded in LHC interaction regions for HiLumi-LHC projects are inner triplet (or low-β) quadrupole magnets, denoted as Q1, Q2a, Q2b, and Q3. The new called MQXF, based on Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn superconducting magnet technology operate at a gradient of 132.6 T/m, with conductor peak field 11.4 T. Q1 Q3 composed magnets (called MQXFA) fabricated by U.S. Accelerator Upgrade Project...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> We report on the progress in our R&D program, targeted to develop technology for application of <formula formulatype="inline"><tex>${\rm Bi}_{2}{\rm Sr}_{2}{\rm CaCu}_{2}{\rm O}_{x}$</tex></formula> (Bi-2212) accelerator magnets. The program uses subscale coils, wound from insulated cables, study suitable materials, heat treatment homogeneity, stability, and effects magnetic field thermal...
NbTi accelerator dipoles are limited to magnetic fields (H) of about 10 T, due an intrinsic upper critical field (H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c2</sub> ) limitation 14 T. To surpass this restriction, prototype Nb xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn magnets being developed which have reached 16 We show that dipole technology is practically 17 18 T insufficient high pinning, and intrinsically 20 22 H...
In support of the Large Hadron Collider luminosity upgrade, a large bore (120 mm) Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn quadrupole with 15 T peak coil field is being developed within framework US LHC Accelerator Research Program (LARP). The 2-layer design mm wide cable aimed at pre-stress control, alignment and quality while exploring magnet performance limits in terms gradient, forces stresses. addition, HQ will...
In the framework of Hi-Lumi LHC Project, CERN and U.S. LARP are jointly developing MQXF, a 150-mm aperture high-field Nb3Sn quadrupole for upgrade inner triplet low-beta interaction regions. The magnet is supported by shell-based structure, providing preload means bladder-key technology differential thermal contraction various components. Two short models have been produced using same cross section currently considered final magnet. structures were preliminarily tested replacing...
As part of the Large Hadron Collider (LHC) Luminosity upgrade program, U.S.-LHC Accelerator Research Program collaboration and CERN are working together to design build a 150-mm aperture Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn quadrupole for LHC interaction regions. A first series 1.5-m-long coils was fabricated assembled in short model. detailed visual inspection carried out investigate cable dimensional changes during...
The 1 m long Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn dipole magnet HD2, fabricated and tested at Lawrence Berkeley National Laboratory, represents a step towards the development of block-type accelerator quality magnets operating in range 13-15 T. design features two coil modules composed layers wound around titanium-alloy pole. layer pole includes round cutout to provide room for bore tube with clear aperture 36 mm. After...
Future upgrades to machines like the Large Hadron Collider (LHC) at CERN will push accelerator magnets beyond 10 T forcing replacement of NbTi superconductors with advanced such as Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn. In support LHC Phase-II upgrade, US Accelerator Research Program (LARP) is developing a large bore (120 mm) Sn Interaction Region (IR) quadrupole (HQ) capable reaching 15 its conductor limit and gradients...
In the past two years US LARP program carried out five tests on a quadrupole magnet aimed at high luminosity upgrade of Large Hadron Collider (HiLumi-LHC). The 1-meter long, 120 mm bore IR (HQ) with short sample gradient 219 T/m 1.9 K and conductor peak field 15 T is part LHC Accelerator Research Program (LARP). series tests, 4.4 K, reached maximum "short-sample" performance 86%. exposed several shortcomings that are now being addressed in & Development program. This paper summarizes test...
The U.S. LHC Accelerator Research Program (LARP) and CERN combined their efforts in developing Nb3Sn magnets for the high-luminosity upgrade. ultimate goal of this collaboration is to fabricate large aperture Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn quadrupoles interaction regions. These will replace present 70-mm-aperture NbTi quadrupole triplets expected increase peak luminosity up 5 × 10 <sup...
The development of Nb3Sn quadrupole magnets for the High-Luminosity LHC upgrade is a joint venture between US Accelerator Research Program (LARP) <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">*</sup> and CERN with goal fabricating large aperture quadrupoles interaction regions (IR). inner triplet (low-β) NbTi in IR will be replaced by stronger boosting program having 10-fold increase integrated luminosity after foreseen upgrades. Previously,...
During the development of MQXF, new Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn quadrupole to be used in large hadron collider (LHC) inner triplets for High Luminosity upgrade, three short models were tested: MQXFS1, MQXFS3, and MQXFS5. These differ use thin or thick laminations iron components, coil design, superconductive strands, rod restack process (RRP) powder tube (PIT). In MQXF azimuthal prestress is provided at room...
About one hundred magnets of six different types shall be installed in the High Luminosity LHC (HL-LHC) years 2026--2028 at CERN. The design, construction and test are based on CERN collaborations with institutes industrial partners USA, Spain, Italy, Japan China. Three correctors Nb–Ti technology feature conductor peak fields 2 to 4 T range: for all them protoype phase has been successfully completed. production is well advanced superferric correctors, starting canted cos theta nested...
We report on our progress in the development of technology for application Bi2Sr2CaCu2O8+x(Bi-2212) Wind-and-React accelerator magnets.A series superconducting subscale coils has been manufactured at LBNL and reacted wire manufacturer SWCC.Selected are impregnated tested self-field, even though exhibited leakage during partial melt heat treatment.Other have disassembled after reaction submitted to critical current (Ic) tests individual cable sections.We results carrying capacity...
In preparation for the high luminosity upgrade of Large Hadron Collider (LHC), LHC Accelerator Research Program (LARP) is developing a new generation large aperture high-field quadrupoles based on Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn technology. One meter long and 120 mm diameter HQ are currently produced as step toward eventual 150 mm. Tests first series coils revealed necessity further optimization coil design...
In preparation for the high luminosity upgrade of Large Hadron Collider, LHC Accelerator Research Program (LARP) in collaboration with CERN is pursuing development MQXF: a 150 mm aperture high-field Nb 3 Sn quadrupole magnet.The phase starts fabrication and test several short models (1.2 m magnetic length) will continue long prototypes.All them are mechanically supported using shell-based support structure, which has been extensively demonstrated on R&D within LARP.The first model MQXFS-AT...
In high field magnet applications, Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn coils undergo a heat treatment step after winding. During this stage, radially expand and longitudinally contract due to the phase change. order prevent residual strain from altering superconducting performances, tooling must provide adequate space for these dimensional changes. The aim of paper is understand behavior cable dimensions during...
With the successful test of first two pre-series magnets US HL-LHC Accelerator Upgrade Project has started production MQXFA to be used in Q1/Q3 inner triplet elements HL-LHC. This good start comes after prototypes with limited performance, and it demonstrates importance learning from past issues. Therefore, this paper we want share most important lessons learned so far, focusing on those which may more interesting for similar projects. We will also present status fabrication US.
Abstract The use of pressurized bladders for stress control superconducting magnets was firstly proposed at Lawrence Berkeley National Laboratory in the early 2000s. Since then, so-called ‘bladders and keys’ procedure has become one reference techniques assembly high-field accelerator demonstrators. Exploiting advantages this method is today critical importance Nb 3 Sn-based magnets, whose production requires preservation tight targets coils to limit effects strain sensitivity brittleness...