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Effect of large momentum spread on emittance measurements
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
2013 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 707, 114-119 p.Article in journal (Refereed) Published
Abstract [en]

We discuss the systematic errors in emittance measurements with quadrupole scans and four screens due to large momentum spread in the beam. This is particularly relevant in the drive beam complex of CLIC and the test beam line TBL in the CTF3 facility at CERN. We also discuss methods to adapt the model to correct for the systematic errors.

Place, publisher, year, edition, pages
2013. Vol. 707, 114-119 p.
Keyword [en]
Beam diagnostic, Chromatic effects, Quadrupole scans
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-197037DOI: 10.1016/j.nima.2012.12.114ISI: 000314956100016OAI: oai:DiVA.org:uu-197037DiVA: diva2:612007
Available from: 2013-03-19 Created: 2013-03-18 Last updated: 2017-12-06Bibliographically approved
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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Olvegård, MajaZiemann, Volker

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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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