English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Luminosity upgrade at the LHC collider using longitudinally flat bunches incombination with the large crossing angle (large Piwinski angle scheme) isbeing studied with renewed interest in recent years. By design, the totalbeam-beam tune shift at the LHC is less than 0.015 for two interaction pointstogether. But the 2010-11 3.5 TeV collider operation and dedicated studiesindicated that the beam-beam tune shift is >0.015 per interaction point. Inview of this development we have revisited the requirements for the LargePiwinski Angle scheme at the LHC. In this paper we present a new set ofparameters and luminosity calculations for the desired upgrade by investigating1) current performance of the LHC injectors, 2) e-cloud issues on nearly flatbunches and 3) realistic beam particle distributions from longitudinal beamdynamics simulations. We also make some remarks on the needed upgrades on theLHC injector accelerators.

LHC luminosity upgrade with large Piwinski angle scheme: a recent look