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Gas - CERN (European Council for Nuclear Research)

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Last Updated: 03 July 2022

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Production of Radioactive Molecular Ions in Radiofrequency Quadrupole Gas-Reaction Cells

Here we suggest that RFQ gas-reaction cells be used to produce RM from radioactive ion beams by room temperature RIB-gas chemical reactions at eV energies. Two options are available: using an ion response cell used as a RFQ ion guide and reaction cell used as an 'on-line ion source' u2019, and using the ARIEL RFQ cooler-buncher. RFQ gas-cells are a safe and effective way to produce RM from chemical reactants that are not intended to be used in ISOL standards.

Source link: https://cds.cern.ch/record/2813078/files/document.pdf


The HL-LHC Beam Gas Vertex Monitor - Simulations for Design Optimisation and Performance Study

The Beam Gas Vertex instrument is a non-invasive transverse beam profile monitor built as part of the LHC's High Luminosity Upgrade. A gas detector and a forward tracking device are the key components of the BGV monitor. This contribution details the status of the simulation studies being conducted to determine the effect of design parameters on the instrument's success and identify gas target and tracker requirements.

Source link: https://cds.cern.ch/record/2813067/files/document.pdf


Dynamic Pressure in the LHC: Detection of Ions Induced by Ionization of Residual Gas by the Proton Beam and by the Electron-Cloud

A critical component of designing results and high visibility in high-energy particle colliders is Ultra-High Vacuum. Consequently, the knowledge of the dynamic pressure evolution during accelerator operation is vital to provide solutions to pressure rises caused by several factors contributing to beam instability, which have caused pressure rises. This work aims to investigate some key phenomena that create LHC dynamic pressure, such as electrons and ions reacting with the beam screens' copper surface.

Source link: https://cds.cern.ch/record/2811650/files/document.pdf


DYVACS (DYnamic VACuum Simulation) Code: Gas Density Profiles in Presence of Electron Cloud in the LHC

Reliable gas density profiles in particle accelerators are a critical step in order to optimize beam pipes and vacuum system design. We therefore recommend upgrade of this code by releasing electron cloud maps** to determine the electron density and electron ionization of gas by electrons, leading to an increase in induced desorption. The pressure evolution calculated with DYVACS reproduces with great precision the experimental pressure measured in the LHC's VPS beam pipes sector*** from the proton beam injection to the stable beam period.

Source link: https://cds.cern.ch/record/2811647/files/document.pdf

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions