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An observation of a transverse to longitudinal emittance exchange at the Fermilab A0 photoinjector
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Koeth, Timothy W.. An observation of a transverse to longitudinal emittance exchange at the Fermilab A0 photoinjector. Retrieved from https://doi.org/doi:10.7282/T33F4PVH

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TitleAn observation of a transverse to longitudinal emittance exchange at the Fermilab A0 photoinjector
NameKoeth, Timothy W. (author); Schnetzer, Stephen (chair); Joseph, Charles (internal member); Lukyanov, Sergei (internal member); Somalwar, Sunil (internal member); Edwards, Helen (outside member); Rutgers University; Graduate School - New Brunswick
Date Created
Other Date2009-05 (degree)
SubjectPhysics and Astronomy, Beam emittance (Nuclear physics)
Extentxiv, 165 p. : ill.
DescriptionAn experimental program to perform a proof of principle of transverse to longitudinal emittance exchange has been developed at the Fermilab A0 Photoinjector. A new beamline, including two magnetic dogleg channels and a TM110 deflecting mode radio frequency cavity, were constructed for the emittance exchange experiment.
The first priority was a measurement of the Emittance Exchange beamline transport matrix. The method of difference orbits was used to measure the transport matrix. Through varying individual beam input vector elements, such as input x, x', y, y', z, or momentum and measuring the changes in all of the beam output vector's elements, output x, x', y, y', z, and momentum the full 6X6 transport matrix was measured. The measured emittance exchange transport matrix was in overall good agreement with our calculated transport matrix.
A direct observation of an emittance exchange was performed by measuring the electron beam's characteristics before and after the emittance exchange beamline. Operating with a 14.3 MeV, 250 pC electron bunch, longitudinal input emittance of 21.1+/-1.5 mm.mrad was observed to be exchanged with output horizontal emittance of 20.8+/-2.00 mm.mrad. Diagnostic limitations in the longitudinal output emittance measurement did not account for an energy-time correlation, thus potentially returning values larger than the actual longitudinal emittance. The horizontal input emittance of 4.67+/-0.22 mm.mrad was observed to be exchanged with the longitudinal output emittance of 7.06+/-0.43 mm.mrad. The apparent longitudinal output emittance growth is consistent with calculated values in which the correlation term is neglected.
NotePh.D.
NoteIncludes bibliographical references (p. 160-164)
Noteby Timothy W. Koeth
Genretheses, ETD doctoral
Persistent URLhttps://doi.org/doi:10.7282/T33F4PVH
Languageeng
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameNjNbRU
RightsThe author owns the copyright to this work.
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