The luminosity monitoring system for the LHC: Modeling and test results

Ratti, A.; Beche, J.-F.; Byrd, J.; Chow, K.; Denes, P.; Doolittle, L.; Ghiorso, W.; Manfredi, P. F.; Monroy, M.; Plate, D.; Stezelberger, T.; Stiller, J. H.; Turko, B.; Turner, W.C.; Yaver, H.; Zimmermann, S.; Braving, E.; Drees, A.; Miyamoto, Ryoichi

doi:10.1109/nssmic.2009.5401747

Cited by 1 publication

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Each data point refers to a different copper absorber thickness. The results [32] show that the shower amplitude increases up to a 20-cm thickness of copper absorber before decreasing, in excellent agreement with the simulation.…”

Section: Shower Studies At the Spssupporting

confidence: 82%

The BRAN luminosity detectors for the LHC

Placidi

Ratti

Turner

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

View full text Add to dashboard Cite

A B S T R A C TThis paper describes the several phases which led, from the conceptual design, prototyping, construction and tests with beam, to the installation and operation of the BRAN (Beam RAte of Neutrals) relative luminosity monitors for the LHC. The detectors have been operating since 2009 to contribute, optimize and maintain the accelerator performance in the two high luminosity interaction regions (IR), the IR1 (ATLAS) and the IR5 (CMS). The devices are gas ionization chambers installed inside a neutral particle absorber 140 m away from the Interaction Points in IR1 and IR5 and monitor the energy deposited by electromagnetic showers produced by high-energy neutral particles from the collisions. The detectors have the capability to resolve the bunch-bybunch luminosity at the 40 MHz bunch rate, as well as to survive the extreme level of radiation during the nominal LHC operation. The devices have operated since the early commissioning phase of the accelerator over a broad range of luminosities reaching 1.4×10 34 cm −2 s −1 with a peak pileup of 45 events per bunch crossing. Even though the nominal design luminosity of the LHC has been exceeded, the BRAN is operating well.After describing how the BRAN can be used to monitor the luminosity of the collider, we discuss the technical choices that led to its construction and the different tests performed prior to the installation in two IRs of the LHC. Performance simulations are presented together with operational results obtained during p-p operations, including runs at 40 MHz bunch rate, Pb-Pb operations and p-Pb operations.

show abstract

Section: Shower Studies At the Spssupporting

confidence: 82%