eeFACT2016 - List of Keywords (lattice)

Paper	Title	Other Keywords	Page
MOOTH4	Performance and Perspective of Modern Synchrotron Light Sources	ion, emittance, synchrotron, SRF	17
	D. Einfeld ESRF, Grenoble, France
	The first synchrotron radiation was used in a so called parasitic mode from high energy machines (1st generation). At the end of the 1970s and the beginning of 1980s accelerators dedicated to the production of synchrotron radiation were built (2nd generations). With the investigation and developments of insertion devices in the middle of 1980, the 3rd generation synchrotron radiation sources were built and emittances down to some nmrad could be reached. At present around 50 Synchrotron Radiation sources are existing around the world. All of these sources reached there the specification (energy, current, emittance, beam stability, etc.) very soon after the commissioning. With the 4th generation, emittances of down to around 100 pmrad should be reached. This is still a factor of 10 away from the requirement of a diffraction limited light source. According to the expertise in designing and operating of synchrotron radiation sources this should be reachable in the future, but only with circumferences of some kilometers like Petra III or PEP-X. Overall the performances and perspective of synchrotron light source are remarkable.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-MOOTH4
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MOT3BH3	Issues in CEPC Pretzel and Partial Double Ring Scheme Design	ion, sextupole, dynamic-aperture, dipole	39
	H. Geng, J. Gao, Q. Qin, D. Wang, Y. Wang, Y. Zhang IHEP, Beijing, People's Republic of China F. Su Institute of High Energy Physics (IHEP), People's Republic of China
	IHEP has proposed a circular electron and positron collider (CEPC) to study the properties of the Higgs boson. In the baseline design, the circumference of CEPC will be taken as 50-70km. The single ring scheme and the partial double ring scheme are now both under study. In the single ring scheme, the electron and positron beam will share the beam pipes, thus a special orbit is needed to avoid the beam colliding at positions except the Interaction Points (IPs). While in the partial double ring scheme, the two beams will be separated into two beam pipes in the parasitic collision positions. This paper will show the latest design of the CEPC lattice, including both the pretzel and partial double ring scheme. Some critical issues that we encountered when designing the lattices will be discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-MOT3BH3
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TUT1AH1	Issues on IR Design at SuperKEKB	ion, sextupole, dynamic-aperture, beam-beam-effects	49
	Y. Ohnishi KEK, Ibaraki, Japan
	The design of the interaction region is one of the most important issue in SuperKEKB. The lattice design with the final focus system and the local chromaticity correction as well as the dynamic aperture under the influence of beam-beam interactions are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT1AH1
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TUT3BH4	Coupling and Dispersion Correction for the Tolerance Study in FCC-ee	ion, coupling, emittance, quadrupole	151
	S. Aumon, A. Doblhammer, B. Härer, B.J. Holzer CERN, Geneva, Switzerland B. Härer KIT, Karlsruhe, Germany K. Oide KEK, Ibaraki, Japan
	The FCC-ee study is investigating the design of a 100 km e⁺/e⁻ circular collider for precision measurements and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 10³⁵ cm^-2s^-1. In order to reach such performances, an extreme focusing of the beam is required in the interaction regions with a low vertical beta function of 2 mm at the IP. Moreover, the FCC-ee physics program requires very low emittances never achieved in a collider with 1.3 nm for ε_x and 2 pm for ε_y at 175~GeV, reducing the coupling ratio to around 2/1000. With such requirements, any field errors and sources of coupling will introduce spurious vertical dispersion which degrades emittances, limiting the luminosity of the machine. This study describes the status of the tolerance study and the impact of errors that will affect the vertical emittance. In order to preserve the FCC-ee performances, in particular ε_y, a challenging correction scheme based on dispersion free steering and linear coupling correction is proposed to keep the coupling and the vertical emittance as low as possible.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT3BH4
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THS1H2	Summary of Optics Issues	ion, dynamic-aperture, optics, sextupole	199
	K. Oide KEK, Ibaraki, Japan
	Summary of Optics Issues
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-THS1H2
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Paper

Title

Other Keywords

Page

MOOTH4

Performance and Perspective of Modern Synchrotron Light Sources

ion, emittance, synchrotron, SRF

17

D. Einfeld
ESRF, Grenoble, France

The first synchrotron radiation was used in a so called parasitic mode from high energy machines (1st generation). At the end of the 1970s and the beginning of 1980s accelerators dedicated to the production of synchrotron radiation were built (2nd generations). With the investigation and developments of insertion devices in the middle of 1980, the 3rd generation synchrotron radiation sources were built and emittances down to some nmrad could be reached. At present around 50 Synchrotron Radiation sources are existing around the world. All of these sources reached there the specification (energy, current, emittance, beam stability, etc.) very soon after the commissioning. With the 4th generation, emittances of down to around 100 pmrad should be reached. This is still a factor of 10 away from the requirement of a diffraction limited light source. According to the expertise in designing and operating of synchrotron radiation sources this should be reachable in the future, but only with circumferences of some kilometers like Petra III or PEP-X. Overall the performances and perspective of synchrotron light source are remarkable.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-MOOTH4

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MOT3BH3

Issues in CEPC Pretzel and Partial Double Ring Scheme Design

ion, sextupole, dynamic-aperture, dipole

39

H. Geng, J. Gao, Q. Qin, D. Wang, Y. Wang, Y. Zhang
IHEP, Beijing, People's Republic of China
F. Su
Institute of High Energy Physics (IHEP), People's Republic of China

IHEP has proposed a circular electron and positron collider (CEPC) to study the properties of the Higgs boson. In the baseline design, the circumference of CEPC will be taken as 50-70km. The single ring scheme and the partial double ring scheme are now both under study. In the single ring scheme, the electron and positron beam will share the beam pipes, thus a special orbit is needed to avoid the beam colliding at positions except the Interaction Points (IPs). While in the partial double ring scheme, the two beams will be separated into two beam pipes in the parasitic collision positions. This paper will show the latest design of the CEPC lattice, including both the pretzel and partial double ring scheme. Some critical issues that we encountered when designing the lattices will be discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-MOT3BH3

Export •

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

TUT1AH1

Issues on IR Design at SuperKEKB

ion, sextupole, dynamic-aperture, beam-beam-effects

49

Y. Ohnishi
KEK, Ibaraki, Japan

The design of the interaction region is one of the most important issue in SuperKEKB. The lattice design with the final focus system and the local chromaticity correction as well as the dynamic aperture under the influence of beam-beam interactions are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT1AH1

Export •

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

TUT3BH4

Coupling and Dispersion Correction for the Tolerance Study in FCC-ee

ion, coupling, emittance, quadrupole

151

S. Aumon, A. Doblhammer, B. Härer, B.J. Holzer
CERN, Geneva, Switzerland
B. Härer
KIT, Karlsruhe, Germany
K. Oide
KEK, Ibaraki, Japan

The FCC-ee study is investigating the design of a 100 km e⁺/e⁻ circular collider for precision measurements and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 10³⁵ cm^-2s^-1. In order to reach such performances, an extreme focusing of the beam is required in the interaction regions with a low vertical beta function of 2 mm at the IP. Moreover, the FCC-ee physics program requires very low emittances never achieved in a collider with 1.3 nm for ε_x and 2 pm for ε_y at 175~GeV, reducing the coupling ratio to around 2/1000. With such requirements, any field errors and sources of coupling will introduce spurious vertical dispersion which degrades emittances, limiting the luminosity of the machine. This study describes the status of the tolerance study and the impact of errors that will affect the vertical emittance. In order to preserve the FCC-ee performances, in particular ε_y, a challenging correction scheme based on dispersion free steering and linear coupling correction is proposed to keep the coupling and the vertical emittance as low as possible.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT3BH4

Export •

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

THS1H2

Summary of Optics Issues

ion, dynamic-aperture, optics, sextupole

199

K. Oide
KEK, Ibaraki, Japan

Summary of Optics Issues

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-THS1H2

Export •

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