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High Precision RF Measurement for ESS Cavity Parameters

Jönsson, Philip LU (2015) EITM01 20141
Department of Electrical and Information Technology
Abstract
In this thesis an investigation of how inaccuracies in measurements affects the field in the cavities used in the accelerator of the European Spallation Source (ESS). New ways to calculate the dynamic detuning and the quality factor of the cavities will also be investigated. This is done by setting up a simulation model in Simulink where the cavities are described by a differential equation. This model includes both the new and old analysis methods. It is found that different inaccuracies have very different effects on the cavity. Inaccuracies in quality factor and R/Q value affect the cavity control the most.

The new calculation method for the dynamic detuning is found to be better since it can show the dynamic detuning both during and... (More)
In this thesis an investigation of how inaccuracies in measurements affects the field in the cavities used in the accelerator of the European Spallation Source (ESS). New ways to calculate the dynamic detuning and the quality factor of the cavities will also be investigated. This is done by setting up a simulation model in Simulink where the cavities are described by a differential equation. This model includes both the new and old analysis methods. It is found that different inaccuracies have very different effects on the cavity. Inaccuracies in quality factor and R/Q value affect the cavity control the most.

The new calculation method for the dynamic detuning is found to be better since it can show the dynamic detuning both during and after the RF pulse and it is less dependent on inaccuracies. For QL the old measurement method is better since inaccuracies have less impact on it than on the new measurement method. (Less)
Popular Abstract (Swedish)
European Spallation Source, ESS, är ett multinationellt forskningscentrum där man, med hjälp av elektriska fält, accelererar protoner upp till nästan ljusets hastighet och sedan låter dem kollidera med en bit volfram. Acceleratorn består av så kallade kaviteter och syftet med examensarbetet är att undersöka hur olika faktorer påverkar mätningar av kaviteternas parametrar och i sin tur hur styrningen påverkas. Nya mätmetoder kommer också att undersökas.
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author
Jönsson, Philip LU
supervisor
organization
course
EITM01 20141
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Accelerator, Cavity, RF, Measurments, ESS
report number
LU/LTH-EIT 2015-425
language
English
id
5048194
date added to LUP
2015-02-17 14:00:28
date last changed
2015-02-17 14:00:28
@misc{5048194,
  abstract     = {In this thesis an investigation of how inaccuracies in measurements affects the field in the cavities used in the accelerator of the European Spallation Source (ESS). New ways to calculate the dynamic detuning and the quality factor of the cavities will also be investigated. This is done by setting up a simulation model in Simulink where the cavities are described by a differential equation. This model includes both the new and old analysis methods. It is found that different inaccuracies have very different effects on the cavity. Inaccuracies in quality factor and R/Q value affect the cavity control the most.

The new calculation method for the dynamic detuning is found to be better since it can show the dynamic detuning both during and after the RF pulse and it is less dependent on inaccuracies. For QL the old measurement method is better since inaccuracies have less impact on it than on the new measurement method.},
  author       = {Jönsson, Philip},
  keyword      = {Accelerator,Cavity,RF,Measurments,ESS},
  language     = {eng},
  note         = {Student Paper},
  title        = {High Precision RF Measurement for ESS Cavity Parameters},
  year         = {2015},
}