MEDSI2018 - List of Keywords (dipole)

Paper	Title	Other Keywords	Page
TUPH01	Installation and Alignment of SESAME Storage Ring	storage-ring, alignment, vacuum, MMI	20
	T.H. Abu-Hanieh SESAME, Allan, Jordan
	SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East) is the first international 3rd generation synchrotron light source in the Middle East region. This paper presents the method used for installing the Storage ring girders, magnets, vacuum chambers, straight sections, and how the alignment was done. The Installation have been done in a short time with few staff. It was hard and difficult, but went great. A substantial progress has been made in the design, construction and installation of the SESAME Mechanical Systems. All Storage Ring accelerator systems are ready and commissioned.
	Poster TUPH01 [2.697 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH01
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TUPH08	Aluminium and Bimetallic Vacuum Chambers for the New ESRF Storage Ring (EBS)	vacuum, SRF, storage-ring, radiation	36
	F. Cianciosi, P.M. Brumund, L. Goirand ESRF, Grenoble, France
	The ESRF is proceeding with the design and procurement of its new low emittance storage ring EBS (Extremely Brilliant Source project). This completely new storage ring requires a new vacuum system including UHV chambers with complex shape and strict geometrical and dimensional tolerances. In order to meet these requirements we decided to build about half of the chambers in aluminum alloy machined from the bulk, the only technology permitting to respect the requirements. The result are 128 chambers, 2.5m long, built in alloy 2219 with Conflat flanges custom made from the chamber supplier by explosion bonding. The production phase is nearly finished, the produced chambers satisfy completely the expectations. A second generation of experimental aluminum chambers was designed as a substitution of some steel ones in order to solve same geometrical difficulties. These chambers are very complex as they have steel-aluminum junctions in the body in order to accommodate bellows and beam position monitor buttons. The delivery of the first prototype of this type of chamber is previewed for June 2018.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH08
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TUPH13	Mechanical Design Challenges Building a Prototype 8-Pole Corrector Magnet	quadrupole, vacuum, alignment, octupole	50
	F.A. DePaola, R. Faussete, S.K. Sharma, C.J. Spataro BNL, Upton, Long Island, New York, USA A.K. Jain, M.S. Jaski ANL, Argonne, Illinois, USA
	An innovative design was developed for an 8-pole corrector magnet for the APS upgrade program. This is a combined function magnet consisting of horizontal and vertical correctors as well as a skew quadrupole. This paper describes technical challenges presented by both the magnetic design and the interface constraints for the magnet. A prototype magnet was built, and extensive testing on the magnet confirmed that all magnetic and mechanical requirements were achieved. Improvements were identified during the manufacturing and testing of the prototype magnet. The final design of the magnet which has incorporated these improvements is discussed in the paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH13
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TUPH17	Design Considerations Associated with the Replacement of a Sextupole Magnet by a Short Wiggler in a Cell of the Diamond Storage Ring Lattice	wiggler, storage-ring, sextupole, photon	63
	N.P. Hammond, I.P.S. Martin DLS, Oxfordshire, United Kingdom
	Now that all of the original straight sections in the Diamond storage ring are occupied, novel ways of converting bending magnet beamline locations into insertion device beamlines have been considered. Recently one cell of the 24 cells was reconfigured in to a Double-Double Bend Achromat (DDBA) to provide a new location for an Undulator and enable a formerly designated bending magnet beamline to become an Insertion Device Beamline. Extending this concept for the new Dual Imaging and Diffraction (DIAD) Beamline proved to have a strong impact on lifetime and injection efficiency, so instead it was decided to remove a Sextupole magnet in one cell and substitute it with a short fixed gap Wiggler. The accelerator physics, mechanical and electrical design aspects associated with the change are described. Mechanical Engineering solutions for the Diamond DDBA Project, J Kay, MEDSI 2014
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH17
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TUPH24	Front End of Dual Imaging and Diffraction Beamline at Diamond Light Source	wiggler, radiation, storage-ring, optics	81
	X. Liu, R.K. Grant, N.P. Hammond, R.K. Rawcliffe DLS, Oxfordshire, United Kingdom
	The Dual Imaging and Diffraction (DIAD) beamline X-ray source is a ten pole mini wiggler. By locating the mini wiggler in place of an existing sextupole magnet, the DIAD beamline is built at a bending magnet beamline position in Diamond. To accommodate the unusual beam trajectory, a new front end was designed for the DIAD beamline. The particular designs and specifications including an improved front end slits design, as well as the synchrotron and dipole ray tracing of the front end are presented in this paper. The development process of delivering the front end - the project challenges, approach and activities are also described along with the technical challenges.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH24
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TUPH28	Calculation of Orbit Distortions for the APS Upgrade Due to Girder Resonances	ground-motion, factory, resonance, quadrupole	95
	J. Nudell, Z. Liu, C.A. Preissner, V. Sajaev ANL, Argonne, Illinois, USA
	Maintaining sub-micron-scale beam stability for the APS-U Multibend Achromat Lattice places strict requirements on the magnet support system. Historically, magnet vibration requirements have been based on physics simulations which make broad generalizations and assumptions regarding the magnet motion. Magnet support systems have been notoriously difficult to analyze with FEA techniques and as a consequence, these analyses have been underutilized in predicting accelerator performance. The APS has developed a procedure for accurate modeling of magnet support systems. The girder mode shapes are extracted from these analyses and exported to accelerator simulation code elegant to calculate the static beam amplification factor for each mode shape. These amplification factors, along with knowledge of damping coefficients and the character of the tunnel floor motion, may then be used to predict the effect of girder resonances on beam stability and validate the magnet support designs.
	Poster TUPH28 [0.848 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH28
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TUPH32	Overview of Sesame Water Cooling System Design & Operation	operation, booster, cavity, storage-ring	108
	M.M. Al Shehab SESAME, Allan, Jordan M. Quispe ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	Funding: IAEA SESAME started operation in January 2017. In order to receive heat deposited in various synchrotron devices during operation, a low-conductivity water cooling system was installed. Within this paper the design, construction and operation of the water cooling system will be discussed, Both Hydraulic and Thermal Behavior of the system will be analyzed and discussed with numerical simulation means as well as real operation pressure and temperature data for the purpose of a better understanding of the cooling system
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH32
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TUPH33	Vibration Measurement & Simulation of Magnet & Girder in SESAME	experiment, software, quadrupole, controls	111
	M.M. Al Shehab SESAME, Amman, Jordan
	Funding: IAEA SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East) started operation in January 2017. During the design phase several FEA studies were performed to optimize the girder and the magnet design taking into account all the constraints such as the tight spacing between magnets, the vacuum chamber installation interactions with the magnets. In this paper the experimental and Numerical modal analysis are presented as well as the result comparison between the experimental and simulation work.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH33
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TUPH38	Preliminary Design of the Magnets of HALS	quadrupole, HOM, sextupole, multipole	129
	B. Zhang, Z.L. Ren, X.Q. Wang, Y. Wang, H. Xu USTC/NSRL, Hefei, Anhui, People's Republic of China
	The Hefei Advanced Light Source (HALS) is a future soft X-ray diffraction-limited storage ring at National Synchrotron Radiation Laboratory (NSRL) of China. This project aims to improve the brilliance and coherence of the X-ray beams and to decrease the horizontal emittance. The lattice of the HALS ring relies on magnets with demanding specifications, including combined function dipole-quadrupoles (DQs) with high gradients, dipoles with longitudinal gradients (DLs), high gradient quadrupoles and sextupoles. All these magnets have been designed using POSSION and Radia. Preliminary design of them are presented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH38
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WEPH02	Thermomechanical Analysis of SESAME High-Heat-Load Front Ends Components	wiggler, simulation, radiation, synchrotron	202
	M.A. Al-Najdawi SESAME, Allan, Jordan
	New front end beamline components at SESAME* are designed to handle the high heat load produced by the insertion devices. A mini gap wiggler will be installed for the Material science Beamline and the front end will receive 5.0 kW of total power and 7.74 kW/mrad2 of peak power density. The power produced by the insertion device was simulated using SynRad+, this software is using Monte Carlo simulation to simulate the synchrotron radiation from either an insertion device or any magnet source, the surface power density distribution generated by this software mapped directly to an FEA software to conduct a coupled thermo-mechanical analsys. The design, modeling, power source simulation and FEA analysis of the fixed mask, shutter and filter for the material science Beamline front end will be presented in this paper Synchrotron-light for Experimental Science and Applications in the Middle East
	Poster WEPH02 [0.939 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH02
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WEPH23	FEA Simulations of the Aluminium Vacuum Chamber for LOREA Insertion Device at ALBA Synchrotron Light Source	radiation, vacuum, distributed, alignment	255
	M. Quispe, A.A. Gevorgyan ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	For LOREA, the new beamline at ALBA, the Insertion Device Apple-II helical out-vacuum undulator requires the installation of a suitable narrow-gap aluminium chamber. The chamber design is based on the standard ALBA aluminium chamber which has an internal elliptical cross section, where NEG coating is deposited and bending magnet (BM) radiation from the upstream dipole is dissipated on the chamber walls. For the standard chamber the upstream distributed absorber cannot protect the entire chamber from direct BM radiation because there is a limitation for its design: the beam impedance of the machine. Based on new studies of collective effects it has been concluded that it's possible to implement modifications on the upstream distributed absorber and protect the chamber from lateral collision of BM radiation keeping the beam impedance of the machine inside of a safe range. In spite of that still there is a contribution of the tails of BM radiation. In this paper we describe the behavior of the new aluminium vacuum chamber for different thermal load conditions using water and air for refrigeration. Also we present the design of the modified OFHC upstream distributed absorber.
	Poster WEPH23 [0.609 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH23
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WEPH24	Design of an Integrated Crotch Absorber for ALBA Synchrotron Light Source	radiation, photon, vacuum, undulator	258
	M. Quispe, J. Campmany, A.A. Gevorgyan, J. Marcos ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	This paper presents the design of an Integrated Crotch Absorber for the new beamline LOREA (Low-Energy Ultra-High-Resolution Angular Photoemission for Complex Materials at ALBA). The LOREA Insertion Device (ID) consists of an Apple II undulator with a period of 125 mm. For the current ALBA dipole chamber the ID vertical polarized light hits the upper and lower walls because of the very narrow vertical aperture between the cooling channels. To solve this problem some modifications must be implemented both in the dipole chamber and in the crotch absorber located inside of the dipole. The new crotch absorber, named Integrated Crotch Absorber, must absorb a significant part of the ID vertical polarized light in order to avoid radiation impinging at the post dipole chamber. The geometry of the Integrated Crotch Absorber is a combination of the conventional crotch and the distributed absorber done at PSI for ANKA. The design has been optimized taking into account the standard thermo-mechanical design criteria as well as the reflective effects of the ID radiation from the opening towards the walls of the dipole chamber.
	Poster WEPH24 [1.046 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH24
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WEPH32	DESIGN OF A LAYERED HIGH PRECISION MAGNET GIRDER	collimation, synchrotron, radiation, synchrotron-radiation	277
	G.Y. Wang, L. Kang, J.B. Yu, J.S. Zhang IHEP, Beijing, People's Republic of China J.X. Chen CSNS, Guangdong Province, People's Republic of China
	In order to adjust the collimation of the light source magnet, a layered magnet girder is developed, which can adjust the six degrees of freedom accurately and reduce the mutual influence of the adjustment process between the various layers of the girder. The precision of the collimation is up to 5 microns.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH32
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

TUPH01

Installation and Alignment of SESAME Storage Ring

storage-ring, alignment, vacuum, MMI

20

T.H. Abu-Hanieh
SESAME, Allan, Jordan

SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East) is the first international 3rd generation synchrotron light source in the Middle East region. This paper presents the method used for installing the Storage ring girders, magnets, vacuum chambers, straight sections, and how the alignment was done. The Installation have been done in a short time with few staff. It was hard and difficult, but went great. A substantial progress has been made in the design, construction and installation of the SESAME Mechanical Systems. All Storage Ring accelerator systems are ready and commissioned.

Poster TUPH01 [2.697 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH01

Export •

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

TUPH08

Aluminium and Bimetallic Vacuum Chambers for the New ESRF Storage Ring (EBS)

vacuum, SRF, storage-ring, radiation

36

F. Cianciosi, P.M. Brumund, L. Goirand
ESRF, Grenoble, France

The ESRF is proceeding with the design and procurement of its new low emittance storage ring EBS (Extremely Brilliant Source project). This completely new storage ring requires a new vacuum system including UHV chambers with complex shape and strict geometrical and dimensional tolerances. In order to meet these requirements we decided to build about half of the chambers in aluminum alloy machined from the bulk, the only technology permitting to respect the requirements. The result are 128 chambers, 2.5m long, built in alloy 2219 with Conflat flanges custom made from the chamber supplier by explosion bonding. The production phase is nearly finished, the produced chambers satisfy completely the expectations. A second generation of experimental aluminum chambers was designed as a substitution of some steel ones in order to solve same geometrical difficulties. These chambers are very complex as they have steel-aluminum junctions in the body in order to accommodate bellows and beam position monitor buttons. The delivery of the first prototype of this type of chamber is previewed for June 2018.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH08

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

TUPH13

Mechanical Design Challenges Building a Prototype 8-Pole Corrector Magnet

quadrupole, vacuum, alignment, octupole

50

F.A. DePaola, R. Faussete, S.K. Sharma, C.J. Spataro
BNL, Upton, Long Island, New York, USA
A.K. Jain, M.S. Jaski
ANL, Argonne, Illinois, USA

An innovative design was developed for an 8-pole corrector magnet for the APS upgrade program. This is a combined function magnet consisting of horizontal and vertical correctors as well as a skew quadrupole. This paper describes technical challenges presented by both the magnetic design and the interface constraints for the magnet. A prototype magnet was built, and extensive testing on the magnet confirmed that all magnetic and mechanical requirements were achieved. Improvements were identified during the manufacturing and testing of the prototype magnet. The final design of the magnet which has incorporated these improvements is discussed in the paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH13

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

TUPH17

Design Considerations Associated with the Replacement of a Sextupole Magnet by a Short Wiggler in a Cell of the Diamond Storage Ring Lattice

wiggler, storage-ring, sextupole, photon

63

N.P. Hammond, I.P.S. Martin
DLS, Oxfordshire, United Kingdom

Now that all of the original straight sections in the Diamond storage ring are occupied, novel ways of converting bending magnet beamline locations into insertion device beamlines have been considered. Recently one cell of the 24 cells was reconfigured in to a Double-Double Bend Achromat (DDBA) to provide a new location for an Undulator and enable a formerly designated bending magnet beamline to become an Insertion Device Beamline*. Extending this concept for the new Dual Imaging and Diffraction (DIAD) Beamline proved to have a strong impact on lifetime and injection efficiency, so instead it was decided to remove a Sextupole magnet in one cell and substitute it with a short fixed gap Wiggler. The accelerator physics, mechanical and electrical design aspects associated with the change are described.
* Mechanical Engineering solutions for the Diamond DDBA Project, J Kay, MEDSI 2014

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH17

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TUPH24

Front End of Dual Imaging and Diffraction Beamline at Diamond Light Source

wiggler, radiation, storage-ring, optics

81

X. Liu, R.K. Grant, N.P. Hammond, R.K. Rawcliffe
DLS, Oxfordshire, United Kingdom

The Dual Imaging and Diffraction (DIAD) beamline X-ray source is a ten pole mini wiggler. By locating the mini wiggler in place of an existing sextupole magnet, the DIAD beamline is built at a bending magnet beamline position in Diamond. To accommodate the unusual beam trajectory, a new front end was designed for the DIAD beamline. The particular designs and specifications including an improved front end slits design, as well as the synchrotron and dipole ray tracing of the front end are presented in this paper. The development process of delivering the front end - the project challenges, approach and activities are also described along with the technical challenges.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH24

Export •

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

TUPH28

Calculation of Orbit Distortions for the APS Upgrade Due to Girder Resonances

ground-motion, factory, resonance, quadrupole

95

J. Nudell, Z. Liu, C.A. Preissner, V. Sajaev
ANL, Argonne, Illinois, USA

Maintaining sub-micron-scale beam stability for the APS-U Multibend Achromat Lattice places strict requirements on the magnet support system. Historically, magnet vibration requirements have been based on physics simulations which make broad generalizations and assumptions regarding the magnet motion. Magnet support systems have been notoriously difficult to analyze with FEA techniques and as a consequence, these analyses have been underutilized in predicting accelerator performance. The APS has developed a procedure for accurate modeling of magnet support systems. The girder mode shapes are extracted from these analyses and exported to accelerator simulation code elegant to calculate the static beam amplification factor for each mode shape. These amplification factors, along with knowledge of damping coefficients and the character of the tunnel floor motion, may then be used to predict the effect of girder resonances on beam stability and validate the magnet support designs.

Poster TUPH28 [0.848 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH28

Export •

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

TUPH32

Overview of Sesame Water Cooling System Design & Operation

operation, booster, cavity, storage-ring

108

M.M. Al Shehab
SESAME, Allan, Jordan
M. Quispe
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

Funding: IAEA
SESAME started operation in January 2017. In order to receive heat deposited in various synchrotron devices during operation, a low-conductivity water cooling system was installed. Within this paper the design, construction and operation of the water cooling system will be discussed, Both Hydraulic and Thermal Behavior of the system will be analyzed and discussed with numerical simulation means as well as real operation pressure and temperature data for the purpose of a better understanding of the cooling system

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH32

Export •

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

TUPH33

Vibration Measurement & Simulation of Magnet & Girder in SESAME

experiment, software, quadrupole, controls

111

M.M. Al Shehab
SESAME, Amman, Jordan

Funding: IAEA
SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East) started operation in January 2017. During the design phase several FEA studies were performed to optimize the girder and the magnet design taking into account all the constraints such as the tight spacing between magnets, the vacuum chamber installation interactions with the magnets. In this paper the experimental and Numerical modal analysis are presented as well as the result comparison between the experimental and simulation work.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH33

Export •

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

TUPH38

Preliminary Design of the Magnets of HALS

quadrupole, HOM, sextupole, multipole

129

B. Zhang, Z.L. Ren, X.Q. Wang, Y. Wang, H. Xu
USTC/NSRL, Hefei, Anhui, People's Republic of China

The Hefei Advanced Light Source (HALS) is a future soft X-ray diffraction-limited storage ring at National Synchrotron Radiation Laboratory (NSRL) of China. This project aims to improve the brilliance and coherence of the X-ray beams and to decrease the horizontal emittance. The lattice of the HALS ring relies on magnets with demanding specifications, including combined function dipole-quadrupoles (DQs) with high gradients, dipoles with longitudinal gradients (DLs), high gradient quadrupoles and sextupoles. All these magnets have been designed using POSSION and Radia. Preliminary design of them are presented in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH38

Export •

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

WEPH02

Thermomechanical Analysis of SESAME High-Heat-Load Front Ends Components

wiggler, simulation, radiation, synchrotron

202

M.A. Al-Najdawi
SESAME, Allan, Jordan

New front end beamline components at SESAME* are designed to handle the high heat load produced by the insertion devices. A mini gap wiggler will be installed for the Material science Beamline and the front end will receive 5.0 kW of total power and 7.74 kW/mrad2 of peak power density. The power produced by the insertion device was simulated using SynRad+, this software is using Monte Carlo simulation to simulate the synchrotron radiation from either an insertion device or any magnet source, the surface power density distribution generated by this software mapped directly to an FEA software to conduct a coupled thermo-mechanical analsys. The design, modeling, power source simulation and FEA analysis of the fixed mask, shutter and filter for the material science Beamline front end will be presented in this paper
Synchrotron-light for Experimental Science and Applications in the Middle East

Poster WEPH02 [0.939 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH02

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WEPH23

FEA Simulations of the Aluminium Vacuum Chamber for LOREA Insertion Device at ALBA Synchrotron Light Source

radiation, vacuum, distributed, alignment

255

M. Quispe, A.A. Gevorgyan
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

For LOREA, the new beamline at ALBA, the Insertion Device Apple-II helical out-vacuum undulator requires the installation of a suitable narrow-gap aluminium chamber. The chamber design is based on the standard ALBA aluminium chamber which has an internal elliptical cross section, where NEG coating is deposited and bending magnet (BM) radiation from the upstream dipole is dissipated on the chamber walls. For the standard chamber the upstream distributed absorber cannot protect the entire chamber from direct BM radiation because there is a limitation for its design: the beam impedance of the machine. Based on new studies of collective effects it has been concluded that it's possible to implement modifications on the upstream distributed absorber and protect the chamber from lateral collision of BM radiation keeping the beam impedance of the machine inside of a safe range. In spite of that still there is a contribution of the tails of BM radiation. In this paper we describe the behavior of the new aluminium vacuum chamber for different thermal load conditions using water and air for refrigeration. Also we present the design of the modified OFHC upstream distributed absorber.

Poster WEPH23 [0.609 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH23

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

WEPH24

Design of an Integrated Crotch Absorber for ALBA Synchrotron Light Source

radiation, photon, vacuum, undulator

258

M. Quispe, J. Campmany, A.A. Gevorgyan, J. Marcos
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

This paper presents the design of an Integrated Crotch Absorber for the new beamline LOREA (Low-Energy Ultra-High-Resolution Angular Photoemission for Complex Materials at ALBA). The LOREA Insertion Device (ID) consists of an Apple II undulator with a period of 125 mm. For the current ALBA dipole chamber the ID vertical polarized light hits the upper and lower walls because of the very narrow vertical aperture between the cooling channels. To solve this problem some modifications must be implemented both in the dipole chamber and in the crotch absorber located inside of the dipole. The new crotch absorber, named Integrated Crotch Absorber, must absorb a significant part of the ID vertical polarized light in order to avoid radiation impinging at the post dipole chamber. The geometry of the Integrated Crotch Absorber is a combination of the conventional crotch and the distributed absorber done at PSI for ANKA. The design has been optimized taking into account the standard thermo-mechanical design criteria as well as the reflective effects of the ID radiation from the opening towards the walls of the dipole chamber.

Poster WEPH24 [1.046 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH24

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WEPH32

DESIGN OF A LAYERED HIGH PRECISION MAGNET GIRDER

collimation, synchrotron, radiation, synchrotron-radiation

277

G.Y. Wang, L. Kang, J.B. Yu, J.S. Zhang
IHEP, Beijing, People's Republic of China
J.X. Chen
CSNS, Guangdong Province, People's Republic of China

In order to adjust the collimation of the light source magnet, a layered magnet girder is developed, which can adjust the six degrees of freedom accurately and reduce the mutual influence of the adjustment process between the various layers of the girder. The precision of the collimation is up to 5 microns.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH32

Export •

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