A5105462677- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Superconducting Materials and Applications
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Neutrino Physics Research
- Spacecraft and Cryogenic Technologies
- Particle accelerators and beam dynamics
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Refrigeration and Air Conditioning Technologies
- Heat Transfer and Optimization
- Advanced Thermodynamic Systems and Engines
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Thermal properties of materials
- Superconductivity in MgB2 and Alloys
- Astrophysics and Cosmic Phenomena
- Atomic and Molecular Physics
- Heat Transfer and Boiling Studies
- Planetary Science and Exploration
- Physics of Superconductivity and Magnetism
- Distributed and Parallel Computing Systems
- Adhesion, Friction, and Surface Interactions
European Organization for Nuclear Research
2014-2024
Yale University
2011-2012
University of Bergen
2012
General Electric (Israel)
1965
A 10 kilo-tonne dual-phase liquid argon TPC is one of the detector options considered for Deep Underground Neutrino Experiment (DUNE). The technology relies on amplification ionisation charge in ultra-pure vapour and offers several advantages compared to traditional single-phase TPCs. 4.2 tonne prototype, largest its kind, with an active volume \three has been constructed operated at CERN. In this paper we describe detail experimental setup components as well report operation experience. We...
Compact high-effectiveness Counter Flow Heat EXchangers (CFHEX) are crucial components of recuperative coolers, such as Joule-Thomson and Turbo-Brayton coolers remote cooling systems realised by a convective loop. This paper presents design analysis cryocooler-based system that extends the capabilities two-stage cryocooler. Increased heat exchange between high- low-pressure channels is established adding copper mesh material. A compact effective mesh-based CFHEX covering 4.5-290 K...
The construction and the assembly of two end-caps ATLAS liquid argon electromagnetic calorimeter as well their test qualification programs are described. work described here started at beginning 2001 lasted for approximately three years. results tests performed before installation in LHC pit given. detectors now installed cavern, full being commissioned. complete coverage is powered with high voltage readout.
A new collaboration is being formed to develop a multi-kiloton Long-Baseline neutrino experiment that will be located at the Surf Underground Research Facility (SURF) in Lead, SD. In present design, detector inside cryostats filled with 68,400 ton of ultrapure liquid argon (less than 100 parts per trillion oxygen equivalent contamination). To qualify membrane technology for future very large-scale and underground implementations, strong prototyping effort ongoing: several smaller detectors...
In the framework of luminosity upgrade LHC, high-field magnets are under development. Magnetic flux densities up to 13 T require use Nb3Sn superconducting coils. Quench protection becomes challenging due high stored energy density and low stabilizer fraction. The thermal conductivity diffusivity combination insulating layers based cables an important thermodynamic input parameter for quench systems superfluid helium cooling studies. A two-stage cryocooler test stand is used measure...
Abstract In the refrigeration technologies available for 2 W - 5 cooling power range at 4.5 K, innovative designs intermediate options are proposed between large-scale cryogenic plants and small-scale commercially cryocoolers. This paper presents a number of remote solutions, which use high-effectiveness mesh-based counterflow heat exchangers (CFHEX) to support aforementioned domain. Additionally, is aimed be provided in remote, distributed non-disturbing manner (i.e. reduced mechanical...
CERN operates and maintains the world largest cryogenic infrastructure ranging from ageing installations feeding detectors, test facilities general services, to state-of-the-art system serving flagship LHC machine complex. After several years of exploitation a wide range in particular following last two major shutdown maintain consolidate machine, we have analysed reviewed maintenance activities implement an efficient reliable installations. We report results, statistics lessons learned on...
Oscillating Superleak Transducers (OSTs) can be used to localize quenches of superconducting radio-frequency cavities. Local hot spots at the cavity surface initiate temperature waves in surrounding superfluid helium that acts as cooling fluid typical temperatures range 1.6 K 2 K. The wave is characterised by properties such second sound velocity. For high heat load densities velocities greater than standard literature values are observed. This fast propagation has been verified dedicated...
Compact effective Counter Flow Heat EXchangers (CFHEX) are critical components of almost all thermodynamic cycles, e.g. cryocooler-based remote cooling circuits that can enable a large number high technology cryogenic applications. It is essential for such applications these CFHEXs match the overall performance system. This paper presents test setup, experimental results and analysis novel mesh-based CFHEX in 50 K–290 K temperature 1 bar–5 bar pressure ranges. The measurements compared to...
Compact high-effectiveness counter-flow heat exchangers (CFHEX) are an essential building block of remote cooling systems and Reverse Turbo-Brayton coolers. This technology enables a wide variety on-ground space applications, including the infrared detectors, cryogenic chains quantum computers ultra-sensitive superconducting SQUID sensors. A mesh-based CFHEX design was previously proposed for such applications demonstrated great potential to meet high effectiveness compactness needs [1]....
Magneto-thermal instability may affect high critical current density Nb3Sn superconducting strands that can quench even though the transport is low compared to with important implications in design of next generation magnets.The initiated by a small perturbation energy which considerably lower than Minimum Quench Energy (MQE).At CERN, new experimental setup was developed measure smallest (Minimum Trigger Energy, MTE) able trigger magneto-thermal Nb 3 Sn-strands.The based on Q-switched laser...
The new AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) Experiment has the main goal to measure Earth's gravitational acceleration of antihydrogen atoms. Two high-homogeneity superconducting 1 T and 5 solenoids are placed on same axis provide magnetic field required for cylindrical Penning traps catch accumulate antiprotons delivered by Antiproton Decelerator CERN. have a free bore 250 mm 160 respectively overall system length is 3 m. equipped with set correction coils...
The helium cooled magnets of the LHC particle accelerator are installed in a confined space, formed by 27 km circumference 3.8 m diameter underground tunnel. vacuum enclosures superconducting protected lift plate against excessive overpressure created eventual leaks from magnet bath, or supply headers. A three-meter long no stay zone has been defined centered to these plates, based on earlier scale model studies, protect personnel consequences an opening such plate. More recently several...
An experimental setup is operational at the Central Cryogenics Laboratory of European Organization for Nuclear Research to measure cooling mechanisms superfluid <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> He (He II) from prepared Rutherford-type superconducting cable stacks a stagnant II bath. For novel magnets designed so-called high-luminosity large hadron collider upgrade, segment fully impregnated Nb <sub...
The motivation of the AEgIS experiment is to test universality free fall with antimatter. goal reach a relative uncertainty 1% for measurement earth's gravitational acceleration [Formula: see text] on an antihydrogen beam. High vertex position resolution required detector. An emulsion based detector can measure annihilation atoms 1-2 μm, which if realized in actual will enable less than 1000 atoms. Developments and achievements detectors are presented here.
The 27 km circumference LHC underground tunnel is a space in which the helium cooled magnets are installed. vacuum enclosures of superconducting protected by over-pressure safety relief devices that open whenever cold escapes either from magnet enclosure or supply headers, into this enclosure. A 3-m long no stay zone around these defined based on scale model studies, protecting personnel against burns asphyxia caused such release event. Recently, several simulation studies have been carried...
Cryogenic dry cooling solutions for Superconducting RF cavities allow synergies with modern cavity production methods based on vacuum coating and A15 SC layer deposition methods. A proof-of-concept cryogenic performance test stand will study relevant parameters of low-temperature loops respect to the a 1.3 GHz prototype cavity. The paper describes options concerning helium forced flow heat transfer at capillary surface plus conduction pathway consequent temperature distribution in itself....
The Short-Baseline Neutrino (SBN) physics program at Fermilab and Platform (NP) CERN are part of the international Program leading to development Long-Baseline Facility/Deep Underground Experiment (LBNF/DUNE) science project. SBN consisting three Liquid Argon Time Projection Chamber (LAr-TPC) detectors positioned along Booster Beam (BNB) includes an existing detector known as MicroBooNE (170-ton LAr-TPC) plus two new experiments SBN's Near Detector (SBND, ∼260 tons) Far (SBN-FD, ∼760 tons)....
A few hundred temperature sensors are used to monitor the behavior of gigantic ATLAS toroid superconducting magnet system during cool down and normal operation.In order guarantee good sensitivity measurements in range from liquid helium room temperature, two types positioned at same location: platinum resistance thermometers for 30-300 K carbon composition resistors (Allen-Bradley) 4-30 range.Both very well known use cryogenics they have performed satisfactorily 10 year operation.The...