Keyword: solenoid
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WECO04 Commissioning of the Non-invasive Profile Monitors for the ESS LEBT LEBT, emittance, MMI, alignment 487
 
  • C.A. Thomas, J. Etxeberria, S. Haghtalab, H. Kocevar, N. Milas, R. Miyamoto, T.J. Shea, R. Tarkeshian
    ESS, Lund, Sweden
 
  In the Low Energy Beam Transport (LEBT) of the European Spallation Source (ESS) Linac, a specific Non-invasive Profile Monitor (NPM) has been designed to primarily monitor beam position monitor with 100 µm accuracy, and in addition enable beam profile and size measurement. We present the first measurement results using NPM during the commissioning of the LEBT. The measurement results conclude the beam position as well as the angle of the beam. The performance of the measurement is discussed and compared to the required accuracy for the position measurement. In addition, the profile of the beam along the propagation axis is reported, as measured for part or the full pulse transported in the LEBT. The fidelity of the reported profile will be discussed as function of the system sensitivity and image signal to noise ratio.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WECO04  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEPP032 Beam Based Alignment of Elements and Source at the ESS Low Energy Beam Transport Line LEBT, simulation, ion-source, MMI 594
 
  • N. Milas, M. Eshraqi, B. Gålander, Y. Levinsen, R. Miyamoto, E. Nilsson, D.C. Plostinar
    ESS, Lund, Sweden
 
  The European Spallation Source (ESS), currently under construction in Lund, Sweden, will be the world’s most powerful linear accelerator driving a neutron spallation source, with an average power of 5 MW at 2.0 GeV. The first protons were accelerated at the ESS site during the commissioning of the ion source and low energy beam transport (LEBT), that started in September 2018 and ran until July 2019. Misalignments of the elements in the LEBT can have a strong impact on the final current transmission of the low energy part. In this paper, we present a way to isolate and measure tilts of the elements and the initial centroid divergence of the source. We also present initial test measurements for the ESS LEBT and discuss how to extend the method to other facilities.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP032  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEPP042 Measurement of the Second Moments of Transverse Beam Distribution with Solenoid Scan electron, emittance, experiment, focusing 638
 
  • I. Pinayev
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Measurement of the dependence of the beam size on profile monitor vs. strength of a focusing element is widely used for measurement of the beam parameters. Such measurements are mostly used for the separate planes and assumption that beam satisfied Gaussian distribution. In many linear accelerators the transverse beam dynamics is coupled between planes and distribution is far from the Gaussian. We developed measurement technique of the second moments of beam distribution which does not rely on any assumptions. The theory and experimental results are presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP042  
About • paper received ※ 03 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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