The new Beam Halo Monitor for the CMS experiment at the LHC


Autoria(s): Tosi, Nicolo
Contribuinte(s)

Navarria, Francesco Luigi

Data(s)

26/02/2015

Resumo

In the context of increasing beam energy and luminosity of the LHC accelerator at CERN, it will be important to accurately measure the Machine Induced Background. A new monitoring system will be installed in the CMS cavern for measuring the beam background at high radius. This detector, called the Beam Halo Monitor, will provide an online, bunch-by-bunch measurement of background induced by beam halo interactions, separately for each beam. The detector is composed of synthetic quartz Cherenkov radiators, coupled to fast UV sensitive photomultiplier tubes. The directional and fast response of the system allows the discrimination of the background particles from the dominant flux in the cavern induced by pp collision debris, produced within the 25 ns bunch spacing. The readout electronics of this detector will make use of many components developed for the upgrade of the CMS Hadron Calorimeter electronics, with a dedicated firmware and readout adapted to the beam monitoring requirements. The PMT signal will be digitized by a charge integrating ASIC, providing both the signal rise time and the charge integrated over one bunch crossing. The backend electronics will record bunch-by-bunch histograms, which will be published to CMS and the LHC using the newly designed CMS beam instrumentation specific DAQ. A calibration and monitoring system has been designed to generate triggered pulses of UV light to monitor the efficiency of the system. The experimental results validating the design of the detector, the calibration system and the electronics will be presented.

Formato

application/pdf

Identificador

http://amsdottorato.unibo.it/6767/1/Tosi_Nicolo_tesi.pdf

urn:nbn:it:unibo-13832

Tosi, Nicolo (2015) The new Beam Halo Monitor for the CMS experiment at the LHC, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Fisica <http://amsdottorato.unibo.it/view/dottorati/DOT244/>, 27 Ciclo. DOI 10.6092/unibo/amsdottorato/6767.

Idioma(s)

en

Publicador

Alma Mater Studiorum - Università di Bologna

Relação

http://amsdottorato.unibo.it/6767/

Direitos

info:eu-repo/semantics/openAccess

Palavras-Chave #FIS/04 Fisica nucleare e subnucleare
Tipo

Tesi di dottorato

NonPeerReviewed