IBIC2020 - List of Authors (Donegani, E.M.)

Paper	Title	Page
WEPP07	The Insertable Beam Stop in the ESS SPK Section	114
	E.M. Donegani, T.J. Grandsaert, T.J. Shea, C.A. Thomas ESS, Lund, Sweden
	This paper deals with the Insertable Beam Stop (IBS) to be installed at the transition between the normal conducting and superconducting sections of the ESS linac. The IBS will be used to avoid beam losses in the cryogenic cavities during tuning and commissioning of the ESS linac. The IBS will stop protons in the energy range from 73 MeV to 92 MeV. The proton beam has a current up to 62.5 mA, and 50·10^-6 or 5E-6s long pulses at a rate of 1 or 14 Hz, respectively. Firstly, the IBS was designed in MCNPX/ANSYS to withstand thermal and structural stresses, while minimizing neutron production and limiting the deposited power in the cryogenic cavities below 0.2 W/m. Secondly, the prompt background and residual dose in the vicinity of the IBS were computed, as well as the activation of the IBS components themselves. Finally, a feasibility study was performed to determine if the IBS can be profitably used as a beam-profile monitoring device. The results will serve as input for calculations of the expected signal in beam loss monitors. Moreover, they will enable the design of the nearby shielding limiting the activation of surrounding structures and allowing maintenance works.
	Poster WEPP07 [0.772 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2020-WEPP07
About •	paper received ※ 01 September 2020 paper accepted ※ 14 September 2020 issue date ※ 30 October 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPP10	Proton-Induced SEY From Beam Interceptive Devices in the ESS Linac	117
	E.M. Donegani ESS, Lund, Sweden
	During the ESS linac commissioning, a wealth of beam-interceptive devices will be exposed to protons with nominal and non-nominal energies spanning from 75 keV to 2 GeV. Therefore, a database of proton-induced Secondary Emission Yield (SEY) values was prepared for the structural materials of insertable devices into the ESS linac. The database relies on calculations of stopping powers in MCNPX and the Sternglass theory applied to protons in the [1 keV, 2 GeV] energy range. Results are reported for 16 relevant materials to wire scanners, bunch shape monitors and target imaging systems, including: TZM, Ni, SiC and graphite of various densities. In the future, the results can be used also for determining the impact of secondaries on emittance or beam-current measurements with Emittance Monitor Units or Faraday cups of the ESS linac, respectively. Moreover, the database can be extended to critical structural materials of the ESS linac itself, in order to estimate the impact of secondary electrons on the overall beam quality.
	Poster WEPP10 [0.528 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2020-WEPP10
About •	paper received ※ 31 August 2020 paper accepted ※ 15 September 2020 issue date ※ 30 October 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

The Insertable Beam Stop in the ESS SPK Section

114

E.M. Donegani, T.J. Grandsaert, T.J. Shea, C.A. Thomas
ESS, Lund, Sweden

This paper deals with the Insertable Beam Stop (IBS) to be installed at the transition between the normal conducting and superconducting sections of the ESS linac. The IBS will be used to avoid beam losses in the cryogenic cavities during tuning and commissioning of the ESS linac. The IBS will stop protons in the energy range from 73 MeV to 92 MeV. The proton beam has a current up to 62.5 mA, and 50·10^-6 or 5E-6s long pulses at a rate of 1 or 14 Hz, respectively. Firstly, the IBS was designed in MCNPX/ANSYS to withstand thermal and structural stresses, while minimizing neutron production and limiting the deposited power in the cryogenic cavities below 0.2 W/m. Secondly, the prompt background and residual dose in the vicinity of the IBS were computed, as well as the activation of the IBS components themselves. Finally, a feasibility study was performed to determine if the IBS can be profitably used as a beam-profile monitoring device. The results will serve as input for calculations of the expected signal in beam loss monitors. Moreover, they will enable the design of the nearby shielding limiting the activation of surrounding structures and allowing maintenance works.

Poster WEPP07 [0.772 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2020-WEPP07

About •

paper received ※ 01 September 2020 paper accepted ※ 14 September 2020 issue date ※ 30 October 2020

Export •

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

WEPP10

Proton-Induced SEY From Beam Interceptive Devices in the ESS Linac

117

E.M. Donegani
ESS, Lund, Sweden

During the ESS linac commissioning, a wealth of beam-interceptive devices will be exposed to protons with nominal and non-nominal energies spanning from 75 keV to 2 GeV. Therefore, a database of proton-induced Secondary Emission Yield (SEY) values was prepared for the structural materials of insertable devices into the ESS linac. The database relies on calculations of stopping powers in MCNPX and the Sternglass theory applied to protons in the [1 keV, 2 GeV] energy range. Results are reported for 16 relevant materials to wire scanners, bunch shape monitors and target imaging systems, including: TZM, Ni, SiC and graphite of various densities. In the future, the results can be used also for determining the impact of secondaries on emittance or beam-current measurements with Emittance Monitor Units or Faraday cups of the ESS linac, respectively. Moreover, the database can be extended to critical structural materials of the ESS linac itself, in order to estimate the impact of secondary electrons on the overall beam quality.

Poster WEPP10 [0.528 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2020-WEPP10

About •

paper received ※ 31 August 2020 paper accepted ※ 15 September 2020 issue date ※ 30 October 2020

Export •

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