Design of the new proton synchrotron booster absorber scraper (PSBAS) in the framework of the large hadron collider injection upgrade (LIU) project

L Teofili,N Chritin,T Rijoff,J Briz,M Migliorati,L Lamas,T Polzin,M Calviani,J Esala,S Gilardoni,J Maestre

doi:10.1088/1742-6596/1067/8/082027

Abstract

The Large Hadron Collider (LHC) Injector Upgrade (LIU) Project at CERN calls for increasing beam intensity for the LHC accelerator chain. Some machine components will not survive the new beam characteristics and need to be rebuilt for the new challenging scenario. This is particularly true for beam intercepting devices (BIDs) such as dumps, collimators, and absorber/scrapers, which are directly exposed to beam impacts. In this context, this work summarizes conceptual design studies on the new Proton Synchrotron Booster (PSB) Absorber/Scraper (PSBAS), a device aimed at cleaning the beam halo at the very early stage of the PSB acceleration. This paper outlines the steps performed to fulfill the component design requirements. It discusses thermo-mechanical effects as a consequence of the beam-matter collisions, simulated with the FLUKA Monte Carlo code and ANSYS® finite element software; and the impedance minimization study performed to prevent beam instabilities and to reduce RF-heating on the device.

Highlights

The beam cleaning system is essential for the entire CERN accelerator chain
This paper presents the conceptual design of its upgrade: the PSBAS
We summarized the main features of the PSBAS conceptual design and we assessed its quality in the HL-Large Hadron Collider (LHC) framework

Summary

INTRODUCTION

The beam cleaning system (collimation and scraping) is essential for the entire CERN accelerator chain. With the increase in beam intensity foreseen by the HLLHC [2] device impedance has become a key design parameter It needs to be minimized for the beam frequency spectrum range in order to avoid beam instabilities or excessive RF-Heating of the component [7, 8]. Detail 1 and 3, there are copper wire spirals inserted on grooves realized on the replacement vacuum chamber and on the movable mask housing They provide a path for the image currents (an electron current that moves in the device wall with the beam) and limit the detrimental effects of the trapped electromagnetic resonant modes in the gaps

Fix Mask

THERMOMECHANICAL STUDIES

Findings

CONCLUSION