IPAC2017 - List of Authors (Eshraqi, M.)

Paper	Title	Page
MOPIK040	Value Engineering of an Accelerator Design During Construction	592
	E. Bargalló, M. Eshraqi, M. Lindroos, S. Molloy, D.C. Plostinar, A. Sunesson ESS, Lund, Sweden F. Gerigk CERN, Geneva, Switzerland
	Value engineering is an important part of the process of designing and realising large-scale installations such as high power accelerators. This typically occurs during the later part of the design stage of the system, however such exercises may also be requested by funding bodies at later stages in order to manage project contingency. Naturally, the later this is done, the more challenging it becomes. In this paper we report on a recently concluded Value Engineering effort at the European Spallation Source. The challenges presented by the initiation of such an exercise during the construction phase are discussed. In addition, we present and discuss the various options that we examined, and indicate the philosophy and figures of merit used to narrow down these options. The final conclusion will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK040
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MOPVA091	Investigation of HOM Frequency Shifts Induced by Mechanical Tolerances	1071
	S. Pirani, M. Eshraqi, M. Lindroos ESS, Lund, Sweden A. Bosotti, J.F. Chen, P. Michelato, C. Pagani, R. Paparella, D. Sertore INFN/LASA, Segrate (MI), Italy T.P.Å. Åkesson Lund University, Department of Physics, Lund, Sweden
	We present Higher Order Mode (HOM) studies on ESS Medium-Beta cavity of INFN-LASA design, including both simulation and measurement results. Mechanical tolerances of the fabrication process might shift HOMs frequencies toward harmonics of the bunch frequency. Both simulation and measurements at room and cryogenic temperature show that INFN LASA cavity is fully compatible with ESS requirements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA091
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TUPVA131	Beam Commissioning Planning Updates for the ESS Linac	2407
	D.C. Plostinar, M. Eshraqi, R. Miyamoto, M. Muñoz ESS, Lund, Sweden
	The European Spallation Source (ESS) is a flagship research facility currently under construction in Lund, Sweden. It is driven by a 2 GeV linac, accelerating a 62.5 mA proton beam at a 4% duty cycle. With an average beam power of 5 MW, when completed the ESS linac will become the world's most powerful. In this paper we summarise the latest beam commissioning plans from the ion source to the target, highlighting the individual phases, the beam dynamics challenges as well as the scheduling strategy.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA131
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THPVA020	Distribution and Extreme Loss Analysis in the ESS Linac: A Statistical Perspective	4458
	A.L. Pedersen Lund Institute of Technology (LTH), Lund University, Lund, Sweden D. Anevski Lund University, Lund, Sweden M. Eshraqi, R. Miyamoto ESS, Lund, Sweden
	The report takes a statistical approach in the study of distribution evolution of the proton beam within the ESS linac and reports a new technique of pinpointing the non-linear space-charge effect of the propagating proton beam. By using the test statistic from the nonparametric Kolmogorov-Smirnov test the author visualises the change in the normalised distributions by looking at the supremum distance between the cumulative distribution functions in comparison, and the propagation of the deviation throughout the ESS linac. This approach identifies changes in the distribution which may cause losses in the linac and highlights the parts where the space-charge has big impact on the beam distribution. Also, an Extreme Value Theory approach is adopted in order to quantify the effects of the non linear forces affecting the proton beam distribution.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA020
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THPVA065	Working Concept of 12.5 kW Tuning Dump at ESS	4591
	Y. Lee, M. Eshraqi, S. Ghatnekar Nilsson, Y.I. Levinsen, R. Miyamoto, S. Molloy, M. Möller, A. Olsson, T.J. Shea, C.A. Thomas, M. Wilborgsson ESS, Lund, Sweden F. Sordo ESS Bilbao, Zamudio, Spain
	The linac system at the European Spallation Source (ESS) will deliver 2~GeV protons at 5~MW beam power. The accelerated protons from the linac will be transported to the rotating tungsten target by two bending magnets. A tuning beam dump will be provided at the end of the linac, downstream of the first bending magnet. This tuning dump shall be able to handle at least 12.5 kW of beam power. In this paper, we present the working concept of the tuning dump. The impact of the proton beam induced material damage on the operational loads and service lifetime of the tuning dump is analysed. A number of particle transport and finite-element simulations are performed for the tuning beam modes.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA065
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Paper

Title

Page

Value Engineering of an Accelerator Design During Construction

592

E. Bargalló, M. Eshraqi, M. Lindroos, S. Molloy, D.C. Plostinar, A. Sunesson
ESS, Lund, Sweden
F. Gerigk
CERN, Geneva, Switzerland

Value engineering is an important part of the process of designing and realising large-scale installations such as high power accelerators. This typically occurs during the later part of the design stage of the system, however such exercises may also be requested by funding bodies at later stages in order to manage project contingency. Naturally, the later this is done, the more challenging it becomes. In this paper we report on a recently concluded Value Engineering effort at the European Spallation Source. The challenges presented by the initiation of such an exercise during the construction phase are discussed. In addition, we present and discuss the various options that we examined, and indicate the philosophy and figures of merit used to narrow down these options. The final conclusion will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK040

Export •

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

MOPVA091

Investigation of HOM Frequency Shifts Induced by Mechanical Tolerances

1071

S. Pirani, M. Eshraqi, M. Lindroos
ESS, Lund, Sweden
A. Bosotti, J.F. Chen, P. Michelato, C. Pagani, R. Paparella, D. Sertore
INFN/LASA, Segrate (MI), Italy
T.P.Å. Åkesson
Lund University, Department of Physics, Lund, Sweden

We present Higher Order Mode (HOM) studies on ESS Medium-Beta cavity of INFN-LASA design, including both simulation and measurement results. Mechanical tolerances of the fabrication process might shift HOMs frequencies toward harmonics of the bunch frequency. Both simulation and measurements at room and cryogenic temperature show that INFN LASA cavity is fully compatible with ESS requirements.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA091

Export •

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

TUPVA131

Beam Commissioning Planning Updates for the ESS Linac

2407

D.C. Plostinar, M. Eshraqi, R. Miyamoto, M. Muñoz
ESS, Lund, Sweden

The European Spallation Source (ESS) is a flagship research facility currently under construction in Lund, Sweden. It is driven by a 2 GeV linac, accelerating a 62.5 mA proton beam at a 4% duty cycle. With an average beam power of 5 MW, when completed the ESS linac will become the world's most powerful. In this paper we summarise the latest beam commissioning plans from the ion source to the target, highlighting the individual phases, the beam dynamics challenges as well as the scheduling strategy.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA131

Export •

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

THPVA020

Distribution and Extreme Loss Analysis in the ESS Linac: A Statistical Perspective

4458

A.L. Pedersen
Lund Institute of Technology (LTH), Lund University, Lund, Sweden
D. Anevski
Lund University, Lund, Sweden
M. Eshraqi, R. Miyamoto
ESS, Lund, Sweden

The report takes a statistical approach in the study of distribution evolution of the proton beam within the ESS linac and reports a new technique of pinpointing the non-linear space-charge effect of the propagating proton beam. By using the test statistic from the nonparametric Kolmogorov-Smirnov test the author visualises the change in the normalised distributions by looking at the supremum distance between the cumulative distribution functions in comparison, and the propagation of the deviation throughout the ESS linac. This approach identifies changes in the distribution which may cause losses in the linac and highlights the parts where the space-charge has big impact on the beam distribution. Also, an Extreme Value Theory approach is adopted in order to quantify the effects of the non linear forces affecting the proton beam distribution.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA020

Export •

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

THPVA065

Working Concept of 12.5 kW Tuning Dump at ESS

4591

Y. Lee, M. Eshraqi, S. Ghatnekar Nilsson, Y.I. Levinsen, R. Miyamoto, S. Molloy, M. Möller, A. Olsson, T.J. Shea, C.A. Thomas, M. Wilborgsson
ESS, Lund, Sweden
F. Sordo
ESS Bilbao, Zamudio, Spain

The linac system at the European Spallation Source (ESS) will deliver 2~GeV protons at 5~MW beam power. The accelerated protons from the linac will be transported to the rotating tungsten target by two bending magnets. A tuning beam dump will be provided at the end of the linac, downstream of the first bending magnet. This tuning dump shall be able to handle at least 12.5 kW of beam power. In this paper, we present the working concept of the tuning dump. The impact of the proton beam induced material damage on the operational loads and service lifetime of the tuning dump is analysed. A number of particle transport and finite-element simulations are performed for the tuning beam modes.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA065

Export •

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