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An energetic charged particle beam introduced to an rf cavity
excites a wakefield therein. This wakefield can be decomposed into
a series of higher order modes and multipoles, which for
sufficiently small beam offsets are dominated by the dipole
component. This work focuses on using these dipole modes to detect
the beam position in third harmonic superconducting S-band cavities
for light source applications. A rigorous examination of several
means of analysing the beam position based on signals radiated to
higher order modes ports is presented. Experimental results
indicate a position resolution, based on this technique, of 20
microns over a complete module of 4 cavities. Methods are also
indicated for improving the resolution and for applying this method
to other cavity configurations. This work is distinguished by its
clarity and potential for application to several other
international facilities. The material is presented in a didactic
style and is recommended both for students new to the field, and
for scientists well-versed in the field of rf diagnostics.
An energetic charged particle beam introduced to an rf cavity
excites a wakefield therein. This wakefield can be decomposed into
a series of higher order modes and multipoles, which for
sufficiently small beam offsets are dominated by the dipole
component. This work focuses on using these dipole modes to detect
the beam position in third harmonic superconducting S-band cavities
for light source applications. A rigorous examination of several
means of analysing the beam position based on signals radiated to
higher order modes ports is presented. Experimental results
indicate a position resolution, based on this technique, of 20
microns over a complete module of 4 cavities. Methods are also
indicated for improving the resolution and for applying this method
to other cavity configurations. This work is distinguished by its
clarity and potential for application to several other
international facilities. The material is presented in a didactic
style and is recommended both for students new to the field, and
for scientists well-versed in the field of rf diagnostics.
An der andauernden Konstruierung von Familienformen und der
Modellierung von Geschlechterrollen und familiaren
Beziehungsmustern sowie der Wechselbeziehung von Ehe, Sexualitat
und Familie ist die deutsche Literatur nach 1945 in erheblichem
Masse beteiligt. Diese Arbeit zielt auf den Wandel des
Familienbildes in der deutschen Literatur nach 1945 und greift
verschiedene literarische Werke auf. Die wichtigen Ansatze der
Familiensoziologie, Gender Studies, Sexualwissenschaft und
Erziehungswissenschaft stellen nach ihrer jeweils eigenen
Definition von Familie und der jeweils eigenen Perspektive auf
Familiengeschichte unterschiedliche Fragen an die Familie und deren
Wandel. Von diesen Standpunkten ausgehend stellt die Untersuchung
die These auf, dass das patriarchalische Familienbild in der
deutschen Literatur nach 1945 ins Wanken gerat und sich ein
offeneres Familienbild auspragt. Trotz der Wandlung des
Familienbildes kann von funktionaler Ausdifferenzierung und
Deinstitutionalisierung der Familie keine Rede sein. Stattdessen
sind ein Funktionswandel von Familien und eine Gestaltung neuer
Familienformen zu beobachten.
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