MEDSI2020 - List of Keywords (cavity)

Paper	Title	Other Keywords	Page
TUOA02	Conceptual Design of the Cavity Mechanical System for Cavity-Based X-Ray Free Electron Laser	FEL, vacuum, laser, electron	103
	D. Shu, J.W.J. Anton, L. Assoufid, W.G. Jansma, S.P. Kearney, K.-J. Kim, R.R. Lindberg, S.T. Mashrafi, X. Shi, Yu. Shvyd’ko, W.F. Toter, M. White ANL, Lemont, Illinois, USA H. Bassan, F.-J. Decker, G.L. Gassner, Z. Huang, G. Marcus, H.-D. Nuhn, T.-F. Tan, D. Zhu SLAC, Menlo Park, California, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract DE-AC02-06CH1 1357 (ANL) and DE-AC02-76SF00515 (SLAC). The concept behind the cavity-based X-ray FELs (CBXFELs) such as the X-ray free-electron laser oscillator (XFELO)* and the X-ray regenerative amplifier free-electron laser (XRAFEL)** is to form an X-ray cavity with a set of narrow bandwidth diamond Bragg crystals. Storing and recirculating the output of an amplifier in an X- ray cavity so that the X-ray pulse can interact with following fresh electron bunches over many passes enables the development of full temporal coherence. One of the key challenges to forming the X-ray cavity is the precision of the cavity mechanical system design and construction. In this paper, we present conceptual design of the cavity mechanical system that is currently under development for use in a proof-of-principle cavity-based X-ray free electron laser experiment at the LCLS-II at SLAC. Kwang-Je Kim et al., TUPRB096, Proceedings of IPAC2019 *Gabe Marcus et al., TUD04, Proceedings of IPAC2019
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUOA02
About •	paper received ※ 02 August 2021 paper accepted ※ 05 October 2021 issue date ※ 30 October 2021
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TUPB12	Assessment of the Corrosion of Copper Components in the Water Cooling System of ALBA Synchrotron Light Source; Presentation of a Proposal to Mitigate the Corrosion Rate of Copper	operation, radio-frequency, controls, quadrupole	171
	M. Quispe, E. Ayas, J.J. Casas, C. Colldelram, Ll. Fuentes, J.C. Giraldo, J. Iglesias, M. Pont ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain J. Buxadera, M. Punset Technical University of Catalonia, The Biomaterials, Biomechanics and Tissue Engineering, Barcelona, Spain
	This paper presents the most recent results on the corrosion of copper components in ALBA water cooling system. The studies have been carried out using a variety of techniques: Scanning Electron Microscopy (SEM), Energy-Dispersive X-Ray Spectroscopy (EDS) and X-Ray Diffraction (XRD). Representative samples of the Accelerator Facility were examined: Storage Ring Absorbers, Front End Masks, Radio Frequency Cavity Pipes, Experimental Line Mask, Radio Frequency Plant Pipes at Service Area and Booster Quadrupole. The studies show the presence of intergranular, pitting and generalized corrosion. The presence of copper oxide is confirmed, as well as other elements such as Aluminum, Carbon, Sulfur, Silver, Calcium, Silicon, Titanium and Iron in some regions of the samples. Likewise, other elements from circulating water such as Potassium and Chlorine have also been detected. The depth of pitting corrosion is less than 119.4 um for the samples studied, after 10 years of operation. To minimize the corrosion problem, an upgrade of the ALBA cooling system is under study. The objective is to reduce the current corrosion rate by a conservative factor of 5. This change is possible by modifying the characteristics of the cooling water, reducing the dissolved oxygen content to values below 10 ppb and increasing the pH above 7.5. Technical aspects of this upgrade are discussed in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPB12
About •	paper received ※ 23 July 2021 paper accepted ※ 16 October 2021 issue date ※ 09 November 2021
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WEPA08	Investigating of EBW Process Weldment Connections Stresses in ILSF 100 MHz Cavity by Simufact. Welding Software	electron, software, vacuum, simulation	239
	V. Moradi ILSF, Tehran, Iran A. Adamian, N.B. Arab PPRC, Tehran, Iran
	The cavity is one of the main components of all accelerators, which is used to increase the energy level of charged particles (electrons, protons, etc.). The cavities increase the energy level of the charged particle by providing a suitable electric field to accelerate the charged particle. Here, information about electron beam welding analysis in 100 MHz cavities of ILSF design will be explained. According to studies performed in most accelerators in the world, connections in cavities are made by various methods such as explosive welding, brazing, electron beam welding, etc. Many articles on large cavities state that the connection of the side doors must be done by the electron beam welding process. However, in the present paper, the three-dimensional model of the cavity is imported into Simufact. Welding software after simplification and mesh process was done, and then the heat source of electron beam welding and other welding factors such as beam power, Gaussian distribution, etc. are applied in the software. The purpose of this study is the number of residual stresses during the EBW process in the 100 MHz cavity of ILSF.
	Poster WEPA08 [2.344 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-WEPA08
About •	paper received ※ 21 July 2021 paper accepted ※ 19 October 2021 issue date ※ 02 November 2021
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WEPA13	Design of a High-Precision Lifting System for the HL-LHC Heavy Components in the Interaction Region	alignment, interface, radiation, interaction-region	255
	F. Micolon, M. Sosin CERN, Meyrin, Switzerland
	Given the high radiation level and the tight alignment tolerances, the HL-LHC interaction region components are designed to be realigned remotely using motorized supporting jacks, as human interventions in these zones must be limited to the strict minimum. A position adjustment system will allow a vertical and horizontal displacement of each jack support by at least ±2.5 mm with a resolution of less than 10 µm. The weight of the supported elements, up to 170 kN and transverse loads reaching 30 kN, will have to be remotely moved by means of mechanical actuators. The system will be exposed to a cumulated radiation dose of up to 2 MGy during the 15 years of lifetime. To comply with these requirements, an extensive de-sign effort has been initiated at CERN to study the possible system layouts. This includes the prototyping of various solutions, studying subsystems through dedicated test setups and using simulations to obtain a clear under-standing of the mechanical principles at play. This paper reports on the work undertaken to design the high-precision lifting system, the various mechanical analysis carried out, and their main outcome. It reviews the proposed solutions and their expected alignment performance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-WEPA13
About •	paper received ※ 15 July 2021 paper accepted ※ 19 October 2021 issue date ※ 30 October 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

TUOA02

Conceptual Design of the Cavity Mechanical System for Cavity-Based X-Ray Free Electron Laser

FEL, vacuum, laser, electron

103

D. Shu, J.W.J. Anton, L. Assoufid, W.G. Jansma, S.P. Kearney, K.-J. Kim, R.R. Lindberg, S.T. Mashrafi, X. Shi, Yu. Shvyd’ko, W.F. Toter, M. White
ANL, Lemont, Illinois, USA
H. Bassan, F.-J. Decker, G.L. Gassner, Z. Huang, G. Marcus, H.-D. Nuhn, T.-F. Tan, D. Zhu
SLAC, Menlo Park, California, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract DE-AC02-06CH1 1357 (ANL) and DE-AC02-76SF00515 (SLAC).
The concept behind the cavity-based X-ray FELs (CBXFELs) such as the X-ray free-electron laser oscillator (XFELO)* and the X-ray regenerative amplifier free-electron laser (XRAFEL)** is to form an X-ray cavity with a set of narrow bandwidth diamond Bragg crystals. Storing and recirculating the output of an amplifier in an X- ray cavity so that the X-ray pulse can interact with following fresh electron bunches over many passes enables the development of full temporal coherence. One of the key challenges to forming the X-ray cavity is the precision of the cavity mechanical system design and construction. In this paper, we present conceptual design of the cavity mechanical system that is currently under development for use in a proof-of-principle cavity-based X-ray free electron laser experiment at the LCLS-II at SLAC.
*Kwang-Je Kim et al., TUPRB096, Proceedings of IPAC2019
**Gabe Marcus et al., TUD04, Proceedings of IPAC2019

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUOA02

About •

paper received ※ 02 August 2021 paper accepted ※ 05 October 2021 issue date ※ 30 October 2021

Export •

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

TUPB12

Assessment of the Corrosion of Copper Components in the Water Cooling System of ALBA Synchrotron Light Source; Presentation of a Proposal to Mitigate the Corrosion Rate of Copper

operation, radio-frequency, controls, quadrupole

171

M. Quispe, E. Ayas, J.J. Casas, C. Colldelram, Ll. Fuentes, J.C. Giraldo, J. Iglesias, M. Pont
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
J. Buxadera, M. Punset
Technical University of Catalonia, The Biomaterials, Biomechanics and Tissue Engineering, Barcelona, Spain

This paper presents the most recent results on the corrosion of copper components in ALBA water cooling system. The studies have been carried out using a variety of techniques: Scanning Electron Microscopy (SEM), Energy-Dispersive X-Ray Spectroscopy (EDS) and X-Ray Diffraction (XRD). Representative samples of the Accelerator Facility were examined: Storage Ring Absorbers, Front End Masks, Radio Frequency Cavity Pipes, Experimental Line Mask, Radio Frequency Plant Pipes at Service Area and Booster Quadrupole. The studies show the presence of intergranular, pitting and generalized corrosion. The presence of copper oxide is confirmed, as well as other elements such as Aluminum, Carbon, Sulfur, Silver, Calcium, Silicon, Titanium and Iron in some regions of the samples. Likewise, other elements from circulating water such as Potassium and Chlorine have also been detected. The depth of pitting corrosion is less than 119.4 um for the samples studied, after 10 years of operation. To minimize the corrosion problem, an upgrade of the ALBA cooling system is under study. The objective is to reduce the current corrosion rate by a conservative factor of 5. This change is possible by modifying the characteristics of the cooling water, reducing the dissolved oxygen content to values below 10 ppb and increasing the pH above 7.5. Technical aspects of this upgrade are discussed in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPB12

About •

paper received ※ 23 July 2021 paper accepted ※ 16 October 2021 issue date ※ 09 November 2021

Export •

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

WEPA08

Investigating of EBW Process Weldment Connections Stresses in ILSF 100 MHz Cavity by Simufact. Welding Software

electron, software, vacuum, simulation

239

V. Moradi
ILSF, Tehran, Iran
A. Adamian, N.B. Arab
PPRC, Tehran, Iran

The cavity is one of the main components of all accelerators, which is used to increase the energy level of charged particles (electrons, protons, etc.). The cavities increase the energy level of the charged particle by providing a suitable electric field to accelerate the charged particle. Here, information about electron beam welding analysis in 100 MHz cavities of ILSF design will be explained. According to studies performed in most accelerators in the world, connections in cavities are made by various methods such as explosive welding, brazing, electron beam welding, etc. Many articles on large cavities state that the connection of the side doors must be done by the electron beam welding process. However, in the present paper, the three-dimensional model of the cavity is imported into Simufact. Welding software after simplification and mesh process was done, and then the heat source of electron beam welding and other welding factors such as beam power, Gaussian distribution, etc. are applied in the software. The purpose of this study is the number of residual stresses during the EBW process in the 100 MHz cavity of ILSF.

Poster WEPA08 [2.344 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-WEPA08

About •

paper received ※ 21 July 2021 paper accepted ※ 19 October 2021 issue date ※ 02 November 2021

Export •

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

WEPA13

Design of a High-Precision Lifting System for the HL-LHC Heavy Components in the Interaction Region

alignment, interface, radiation, interaction-region

255

F. Micolon, M. Sosin
CERN, Meyrin, Switzerland

Given the high radiation level and the tight alignment tolerances, the HL-LHC interaction region components are designed to be realigned remotely using motorized supporting jacks, as human interventions in these zones must be limited to the strict minimum. A position adjustment system will allow a vertical and horizontal displacement of each jack support by at least ±2.5 mm with a resolution of less than 10 µm. The weight of the supported elements, up to 170 kN and transverse loads reaching 30 kN, will have to be remotely moved by means of mechanical actuators. The system will be exposed to a cumulated radiation dose of up to 2 MGy during the 15 years of lifetime. To comply with these requirements, an extensive de-sign effort has been initiated at CERN to study the possible system layouts. This includes the prototyping of various solutions, studying subsystems through dedicated test setups and using simulations to obtain a clear under-standing of the mechanical principles at play. This paper reports on the work undertaken to design the high-precision lifting system, the various mechanical analysis carried out, and their main outcome. It reviews the proposed solutions and their expected alignment performance.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-WEPA13

About •

paper received ※ 15 July 2021 paper accepted ※ 19 October 2021 issue date ※ 30 October 2021

Export •

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