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Analog Front End Development for the Large Hadron Collider Interlock Beam Position Monitor Upgrade
KTH, School of Electrical Engineering and Computer Science (EECS).
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The interlock Beam Position Monitor (BPM) system in the Large Hadron Collider(LHC) is responsible for monitoring the particle beam position at the point of thebeam dump kicker magnets and is part of the machine protection system. Thecurrent interlock BPM system has some limitations and because of this, an upgradeproject has been initiated. This master thesis describes the development of theanalog front end electronics of this system, consisting mainly of two parts: A delayline based microwave filter and a high isolation and highly balanced power combinercircuit.The filter has been validated with real LHC beam measurements and is found towork as expected. More work however needs to be done to ensure the effect that thefilter itself has on the beam measurements as the filter could introduce some ringingeffects on the signal. The highly balanced high isolation power combiner has beentested through lab measurements and also shows promising results but long-termtests need to be conducted to ensure the reliability of the component as it will needto endure very high signal levels over long periods of time.

Abstract [sv]

Det system som mäter partikelstrålens position och ansvarar för att extraktion avdenna kan ske under säkra och pålitliga former i Large Hadron Collider (LHC) heterLHC interlock beam position monitor (BPM) och är en viktig del av LHC:s maskinskydd.Det nuvarande system som utför dessa mätningar har vissa begransningaroch till följd av detta har en uppgradering av systemet påbörjats. Detta examensarbetebeskriver utvecklingen av den elektronik som kommer att användas i systemetsanaloga signalkedja som består i huvudsak av ett filter samt en balanserad effektdelareför radiofrekvenser.Filtret har utvärderats genom verkliga mätningar av partikelstrålen och har konstateratsfungera som väntat. Mer arbete krävs dock för att bestämma påverkansom filtret självt har på positionsmätningarna då det introducerar en viss ringandeeffekt på signalerna. Den balanserade effektdelaren har testats i lab och visar ocksåpå lovande resultat men kräver tester över längre tid då denna komponent kommeratt behöva utstå höga signalnivåer under långa tidsperioder.

Place, publisher, year, edition, pages
2019. , p. 88
Series
TRITA-EECS-EX ; 2019:48
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-253207OAI: oai:DiVA.org:kth-253207DiVA, id: diva2:1324244
External cooperation
CERN
Educational program
Master of Science - Electrophysics
Supervisors
Examiners
Available from: 2019-06-13 Created: 2019-06-13 Last updated: 2019-06-13Bibliographically approved

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