MEDSI2016 - Table of Session: WEBA (Core Technology Updates)

Paper	Title	Page
WEBA01	Nostradamus and the Synchrotron Engineer: Key Aspects of Predicting Accelerator Structural Response	272
	C.A. Preissner, H. Cease, J.T. Collins, Z. Liu, J. Nudell ANL, Argonne, Illinois, USA B.N. Jensen MAX IV Laboratory, Lund University, Lund, Sweden
	Funding: Argonne is managed by UChicago Argonne, LLC, for the U.S. Department of Energy under contract DE-AC02-06CH11357. MBA designs are placing stringent mechanical tolerances on the magnet support systems. At the APS-U the mag-net-to-magnet vibration tolerances are about 10 nm . Timelines, installation requirements, and budgets constrain the resources available for prototyping and physical testing. Reliance on FEA to predict dynamic response is para-mount in insuring the tolerances are met. However, obtaining accurate results from a magnet support structure FEA is not as simple as analysing the CAD model of the structure. The 16th century author Nostradamus published a collection of prophecies that since his time, have been held up as predictions of various world events. While it is attractive to think his collection of short poems can be used to foretell the future, in reality it is only the vagueness and absence of any dates that make them easy to apply in a posthoc basis. Arguably, a similar statement can be made about the use of FEA in predicting accelerator support response. In this presentation the important contributors to FEA dynamic modelling will be discussed along with techniques that can be used to generate necessary data for models that can accurately predict response. APS-Upgrade, Functional Requirements Document, Advanced Photon Source, Argonne, IL, USA, APSU1695659, May 2016.
	Slides WEBA01 [14.136 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEBA01
About •	paper received ※ 10 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017
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WEBA02	Minimization of Mechanical Constraint Effects of Eutectic GaIn as Thermal Interface
	L. Zhang, D. Cocco, J.H. James, N.M. Kelez, D.S. Morton SLAC, Menlo Park, California, USA
	Eutectic Gallium-Indium (eGaIn: 75% Gallium + 25 Indium) is widely used as the thermal interface in water-cooled X-ray optics. The thermal contact resistance of the eGaIn can be smaller than 0.1 mm2. K/W. The LCLS-II KB mirrors will be water cooled, and mostly dynamically bendable. The requirement on the bending accuracy can be expressed as residual slope error after the subtraction of the ideal ellipsoidal shape. This residual slope error should be smaller than 0.1rad, which is at least 4 orders of magnitude smaller than the mirror bent slope. Therefore, the mechanical constraint force from the eGaIn interface should be at least 4, and mostly 5 orders of magnitude smaller than the bending forces with the bending arm length comparable to the mirror length. But what is the mechanical constraint force of the eGaIn interface? What are the mechanical properties of the eGaIn in terms of Youngs or shear modulus. How should this eGaIn interface optimized, for instance the thickness of this interface? In this paper, we will present experimental studies conducted at SLAC to answer these questions, and propose a solution to minimize the constraint forces of the eGaIn.
	Slides WEBA02 [6.677 MB]
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WEBA03	Recent Progress on the Design of High-Heat-Load Components	277
	S.K. Sharma, C. Amundsen, F.A. DePaola, F.C. Lincoln, J.L. Tuozzolo BNL, Upton, Long Island, New York, USA
	A new design was recently proposed for the high power masks and slits of the front-ends at the 2014 MEDSI Conference. The main features of the new design are integrated knife edges in high conductivity copper alloys, interception of the photon beam only on horizontal surfaces, replacing Glidcop® with readily available CuCrZr, and thermal optimization with internal fins. Numerous components based on this design have been built for NSLS-II front-ends and some of the design features have been incorporated into other high-heat-load components such as beamline masks and crotch absorbers. In this paper we describe recent progress at NSLS-II in further advancing this design approach by FE analysis, fabrication and testing.
	Slides WEBA03 [4.523 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEBA03
About •	paper received ※ 09 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017
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WEBA04	A Discussion on Utilization of Heat Pipes and Vapour Chamber Technology as a Primary Device for Heat Extraction from Photon Absorber Surfaces	280
	K.J. Suthar, P.K. Den Hartog, A.M. Lurie ANL, Argonne, Illinois, USA
	Funding: This research used resources of the APS, a U.S. Department of Energy Office of Science User Facility operated by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. The basic problem for photon absorbers in a particle accelerator is to remove a large quantity of heat from a small space. Heat pipes and vapor chambers excel at precisely this so it is natural to consider them for the application. However, even though this technology has been proven to be an excellent thermal management solution for cooling everything from laptops to satellite shields in space, they have yet to be adopted for use in particle accelerators. The use of heat pipes and vapor chambers are thermal transport devices which work on the principle of capillary-force-driven two-phase flow. These devices are highly customizable and offer very high effective thermal conductivities (5,000-200, 000 W/m/K) depending on many factors including size, shape, and orientation. This paper discusses feasibility of the use of heat pipes and vapor chambers as the primary heat transport devices in particle accelerator photon absorbers. We discuss their limitations and advantages via careful consideration of analysis and simulation results assuming properties described in the literature and manufacturer specifications.
	Slides WEBA04 [3.263 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEBA04
About •	paper received ※ 10 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Nostradamus and the Synchrotron Engineer: Key Aspects of Predicting Accelerator Structural Response

272

C.A. Preissner, H. Cease, J.T. Collins, Z. Liu, J. Nudell
ANL, Argonne, Illinois, USA
B.N. Jensen
MAX IV Laboratory, Lund University, Lund, Sweden

Funding: Argonne is managed by UChicago Argonne, LLC, for the U.S. Department of Energy under contract DE-AC02-06CH11357.
MBA designs are placing stringent mechanical tolerances on the magnet support systems. At the APS-U the mag-net-to-magnet vibration tolerances are about 10 nm *. Timelines, installation requirements, and budgets constrain the resources available for prototyping and physical testing. Reliance on FEA to predict dynamic response is para-mount in insuring the tolerances are met. However, obtaining accurate results from a magnet support structure FEA is not as simple as analysing the CAD model of the structure. The 16th century author Nostradamus published a collection of prophecies that since his time, have been held up as predictions of various world events. While it is attractive to think his collection of short poems can be used to foretell the future, in reality it is only the vagueness and absence of any dates that make them easy to apply in a posthoc basis. Arguably, a similar statement can be made about the use of FEA in predicting accelerator support response. In this presentation the important contributors to FEA dynamic modelling will be discussed along with techniques that can be used to generate necessary data for models that can accurately predict response.
* APS-Upgrade, Functional Requirements Document, Advanced Photon Source, Argonne, IL, USA, APSU1695659, May 2016.

Slides WEBA01 [14.136 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEBA01

About •

paper received ※ 10 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017

Export •

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

WEBA02

Minimization of Mechanical Constraint Effects of Eutectic GaIn as Thermal Interface

L. Zhang, D. Cocco, J.H. James, N.M. Kelez, D.S. Morton
SLAC, Menlo Park, California, USA

Eutectic Gallium-Indium (eGaIn: 75% Gallium + 25 Indium) is widely used as the thermal interface in water-cooled X-ray optics. The thermal contact resistance of the eGaIn can be smaller than 0.1 mm2. K/W. The LCLS-II KB mirrors will be water cooled, and mostly dynamically bendable. The requirement on the bending accuracy can be expressed as residual slope error after the subtraction of the ideal ellipsoidal shape. This residual slope error should be smaller than 0.1rad, which is at least 4 orders of magnitude smaller than the mirror bent slope. Therefore, the mechanical constraint force from the eGaIn interface should be at least 4, and mostly 5 orders of magnitude smaller than the bending forces with the bending arm length comparable to the mirror length. But what is the mechanical constraint force of the eGaIn interface? What are the mechanical properties of the eGaIn in terms of Youngs or shear modulus. How should this eGaIn interface optimized, for instance the thickness of this interface? In this paper, we will present experimental studies conducted at SLAC to answer these questions, and propose a solution to minimize the constraint forces of the eGaIn.

Slides WEBA02 [6.677 MB]

Export •

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

WEBA03

Recent Progress on the Design of High-Heat-Load Components

277

S.K. Sharma, C. Amundsen, F.A. DePaola, F.C. Lincoln, J.L. Tuozzolo
BNL, Upton, Long Island, New York, USA

A new design was recently proposed for the high power masks and slits of the front-ends at the 2014 MEDSI Conference. The main features of the new design are integrated knife edges in high conductivity copper alloys, interception of the photon beam only on horizontal surfaces, replacing Glidcop® with readily available CuCrZr, and thermal optimization with internal fins. Numerous components based on this design have been built for NSLS-II front-ends and some of the design features have been incorporated into other high-heat-load components such as beamline masks and crotch absorbers. In this paper we describe recent progress at NSLS-II in further advancing this design approach by FE analysis, fabrication and testing.

Slides WEBA03 [4.523 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEBA03

About •

paper received ※ 09 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017

Export •

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

WEBA04

A Discussion on Utilization of Heat Pipes and Vapour Chamber Technology as a Primary Device for Heat Extraction from Photon Absorber Surfaces

280

K.J. Suthar, P.K. Den Hartog, A.M. Lurie
ANL, Argonne, Illinois, USA

Funding: This research used resources of the APS, a U.S. Department of Energy Office of Science User Facility operated by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
The basic problem for photon absorbers in a particle accelerator is to remove a large quantity of heat from a small space. Heat pipes and vapor chambers excel at precisely this so it is natural to consider them for the application. However, even though this technology has been proven to be an excellent thermal management solution for cooling everything from laptops to satellite shields in space, they have yet to be adopted for use in particle accelerators. The use of heat pipes and vapor chambers are thermal transport devices which work on the principle of capillary-force-driven two-phase flow. These devices are highly customizable and offer very high effective thermal conductivities (5,000-200, 000 W/m/K) depending on many factors including size, shape, and orientation. This paper discusses feasibility of the use of heat pipes and vapor chambers as the primary heat transport devices in particle accelerator photon absorbers. We discuss their limitations and advantages via careful consideration of analysis and simulation results assuming properties described in the literature and manufacturer specifications.

Slides WEBA04 [3.263 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEBA04

About •

paper received ※ 10 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017

Export •

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