Design of an ultra-high vacuum chamber for acceptance tests for ALBA Synchrotron

The present project is dedicated to the design of a HV/UHV movable chamber for the synchrotron ALBA, conceived for testing components used at this facility.The vacuum requirement of the chamber operation and its geometry constrainall the stages of the design. Starting from a given setof technical specifications,a conceptual design of the chamber was carried out using the NXdesign software.The materialof the chamber walls, portsand vacuum system components will be selected. Regarding the vacuum system, a calculation of the pumping time required forachieving HV is carried out. The HV and UHV steady stateswere studied using the MolFlow+ code. Results obtained in these simulations give pressure profiles inside the chamber for a number of ion pumps that allows to select the most optimal one. The project also includesthe validation of the mechanical model created in NX software by comparing it to the model obtained by the ALBA group by means of the finite elementanalysi

Design of an ultra-high vacuum chamber for acceptance tests for ALBA Synchrotron

The present project is dedicated to the design of a HV/UHV movable chamber for the synchrotron ALBA, conceived for testing components used at this facility.The vacuum requirement of the chamber operation and its geometry constrainall the stages of the design. Starting from a given setof technical specifications,a conceptual design of the chamber was carried out using the NXdesign software.The materialof the chamber walls, portsand vacuum system components will be selected. Regarding the vacuum system, a calculation of the pumping time required forachieving HV is carried out. The HV and UHV steady stateswere studied using the MolFlow+ code. Results obtained in these simulations give pressure profiles inside the chamber for a number of ion pumps that allows to select the most optimal one. The project also includesthe validation of the mechanical model created in NX software by comparing it to the model obtained by the ALBA group by means of the finite elementanalysi

HL-LHC Beam Gas Fluorescence Studies for Transverse Profile Measurement

In a gas jet monitor, a supersonic gas curtain is injected into the beam pipe and interacts with the charged particle beam. The monitor exploits fluorescence induced by beam-gas interactions, thus providing a minimally invasive transverse profile measurement. Such a monitor is being developed as part of the High Luminosity LHC upgrade at CERN. As a preliminary study, the fluorescence cross section of relevant gases must be measured for protons at 450 GeV and 6.8 TeV (i.e. the LHC injection and flat top energies). In these measurements, neon, or alternatively nitrogen gas, will be injected into the LHC vacuum pipe by a regulated gas valve to create an extended pressure bump. This work presents the optical detection system that was installed in 2022 in the LHC to measure luminescence cross-section and horizontal beam profile. Preliminary measurements of background light and first signals are presented in this paper

Design of a Prototype Gas Jet Profile Monitor for Installation Into the Large Hadron Collider at CERN

The Beam-Gas Curtain or BGC is the baseline instrument for monitoring the concentricity of the LHC proton beam with a hollow electron beam for the hollow e-lens (HEL) beam halo suppression device which is part of the High-Luminosity LHC upgrade. The proof-of-principles experiments of this gas-jet monitor have now been developed into a prototype instrument which has been built for integration into the LHC ring and is now under phased installation for operation in the upcoming LHC run. This paper describes the challenges overcome to produce a gas-jet fluorescence monitor for the ultra-high vacuum accelerator environment. It also presents preliminary results from the installation of the instrument at CERN