IBIC2019 - List of Authors (Eshraqi, M.)

Paper	Title	Page
WEPP032	Beam Based Alignment of Elements and Source at the ESS Low Energy Beam Transport Line	600
	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
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPP033	Position Based Phase Scan	605
	N. Milas, M. Eshraqi, Y. Levinsen, R. Miyamoto, D.C. Plostinar ESS, Lund, Sweden Y. Liu KEK/JAEA, Ibaraki-Ken, Japan
	Knowledge of the longitudinal beam parameters is important for understanding beam dynamics in linacs. As well as with transverse optics, the settings for the RF cavities have to be established and phase and amplitude seen by the beam must be determined in order to guarantee a stable motion in the longitudinal plane. This work presents an extension of the most widely used phase scan method, relying on time-of-flight, using only transverse positions measured at a few selected BPMs downstream of the cavity being scanned. In principle, the method can be applied both to normal conducting and SC. The suggested method is fast and relatively simple and is capable to provide the values for the cavity transverse misalignment (offsets and tilts) at the same time. It can be a useful part of the initial longitudinal beam tuning.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP033
About •	paper received ※ 04 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Beam Based Alignment of Elements and Source at the ESS Low Energy Beam Transport Line

600

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

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPP033

Position Based Phase Scan

605

N. Milas, M. Eshraqi, Y. Levinsen, R. Miyamoto, D.C. Plostinar
ESS, Lund, Sweden
Y. Liu
KEK/JAEA, Ibaraki-Ken, Japan

Knowledge of the longitudinal beam parameters is important for understanding beam dynamics in linacs. As well as with transverse optics, the settings for the RF cavities have to be established and phase and amplitude seen by the beam must be determined in order to guarantee a stable motion in the longitudinal plane. This work presents an extension of the most widely used phase scan method, relying on time-of-flight, using only transverse positions measured at a few selected BPMs downstream of the cavity being scanned. In principle, the method can be applied both to normal conducting and SC. The suggested method is fast and relatively simple and is capable to provide the values for the cavity transverse misalignment (offsets and tilts) at the same time. It can be a useful part of the initial longitudinal beam tuning.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP033

About •

paper received ※ 04 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)