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Performance of parabolic and diffusive OTR screens at the CLIC Test Facility 3
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
CERN, European Organization for Nuclear Research, Geneva, Switzerland.
CERN, European Organization for Nuclear Research, Geneva, Schweiz.
CERN, European Organization for Nuclear Research, Geneva, Switzerland.
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2011 (English)In: Proceedings of DIPAC2011, Hamburg, Germany, 2011, 413-415 p.Conference paper, Published paper (Other academic)
Abstract [en]

At the CLIC Test Facility 3, OTR screens are commonly used in beam imaging systems for energy and energy spread characterization in dedicated spectrometer lines. In these lines the horizontal beam size is typically of the order of one centimeter. Already in 2005 a limitation was observed resulting from a strong dependence of the intensity of the light captured by the camera, on the positionon the screen (vignetting). The severity of this effect increases with the electron energy, as the aperture of the optical system is finite and the OTR photons are emitted in asmall cone of 1/γ angle. To mitigate this effect, different shapes and surface polishing of the screens were investigated. Parabolic and diffusive OTR radiators were tested in several spectrometer lines all along the CTF3 complex.The results are presented in this paper.

Place, publisher, year, edition, pages
2011. 413-415 p.
National Category
Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:uu:diva-197569OAI: oai:DiVA.org:uu-197569DiVA: diva2:613435
Conference
DIPAC 2011, Hamburg, Germany
Available from: 2013-03-27 Created: 2013-03-27 Last updated: 2013-08-30
In thesis
1. Emittance and Energy Diagnostics for Electron Beams with Large Momentum Spread
Open this publication in new window or tab >>Emittance and Energy Diagnostics for Electron Beams with Large Momentum Spread
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Following the discovery of the Higgs-like boson at the Large Hadron Collider, there is demand for precision measurements on recent findings. The Compact Linear Collider, CLIC, is a candidate for a future linear electron-positron collider for such precision measurements. In CLIC, the beams will be brought to collisions in the multi-TeV regime through high gradient acceleration with high frequency RF power. A high intensity electron beam, the so-called drive beam, will serve as the power source for the main beam, as the drive beam is decelerated in special structures, from which power is extracted and transfered to the main beam. When the drive beam is decelerated the beam quality deteriorates and the momentum spread increases, which makes the beam transport challenging. Dedicated diagnostics to monitor the momentum profile along each bunch train and transverse profile diagnostics will be needed to guarantee the reliability of the decelerator and consequently the power source of the main beam acceleration.

A test facility, CTF3, has been constructed at CERN to validate key technical aspects of the CLIC concept. The beam quality in the decelerator will be investigated in the test beam line, TBL, where several power extraction structures reduce the drive beam energy by up to 55%. At the same time, the single-bunch rms energy spread grows from the initial value of 1% to almost 6%. To monitor the parameters of such a beam is challenging but crucial for the optimization of the beamline. In this thesis we report on progress made on adapting generally used methods for beam profile measurements to the demanding conditions of a wide momentum profile. Two detector technologies are used for measuring transverse profile and momentum profile and we discuss the performance of these instruments, in the view of the large momentum spread and with the outlook towards equivalent beam profile monitors in the CLIC decelerator.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2013. 79 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1036
Keyword
beam instrumentation, particle beam diagnostic, emittance, particle collider, particle accelerator
National Category
Subatomic Physics
Research subject
High Energy Physics
Identifiers
urn:nbn:se:uu:diva-198080 (URN)978-91-554-8646-4 (ISBN)
Public defence
2013-05-24, Sal 2001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Funder
EU, FP7, Seventh Framework Programme, PITN-GA-2008-215080-DITANET
Available from: 2013-05-03 Created: 2013-04-08 Last updated: 2013-08-30

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