eeFACT2016 - List of Keywords (synchrotron)

Paper	Title	Other Keywords	Page
MOOTH4	Performance and Perspective of Modern Synchrotron Light Sources	ion, emittance, lattice, 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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MOT4H7	Ideas for Siberian Snakes and Spin Rotators in Very High Energy e⁺e⁻ Rings	ion, polarization, solenoid, dipole	47
	S.R. Mane Convergent Computing, Shoreham, New York, USA
	The high value of the radiated power in synchrotron radiation in very high energy e⁺e⁻ storage rings presents unique challenges for the design of Siberian Snakes and spin rotators in such machines. This paper presents some ideas which may lead to a feasible design of such devices. The idea is to employ solenoids interleaved with the arc dipoles, to yield a set of noncommuting spin rotations, which can rotate an initially vertical spin to any desired direction. The solenoids should be (approximately) optically transparent, and can be 'spin matched' to the ring using known procedures. Preliminary numerical studies indicate the design may be feasible.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-MOT4H7
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TUT3AH1	Collective Effects Issues for FCC-ee	ion, impedance, wakefield, radiation	100
	M. Migliorati University of Rome La Sapienza, Rome, Italy E. Belli CERN, Geneva, Switzerland G. Castorina, B. Spataro, M. Zobov INFN/LNF, Frascati (Roma), Italy S. Persichelli LBNL, Berkeley, California, USA
	The Future Circular Collider study, hosted by CERN to design post-LHC particle accelerator options in a worldwide context, represents a great challenge under several aspects, which require R&D on beam dynamics and new technologies. One very critical point is represented by collective effects, generated by the interaction of the beam with self-induced electromagnetic fields, called wake fields, which could produce beam instabilities, thus reducing the machines performance and limiting the maximum stored current. It is therefore very important to be able to predict these effects and to study in detail potential solutions to counteract them. In this paper the resistive wall and some other important geometrical sources of impedance for the FCC electron-positron accelerator are identified and evaluated, and their impact on the beam dynamics, which could lead to unwanted instabilities, is discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT3AH1
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Paper

Title

Other Keywords

Page

MOOTH4

Performance and Perspective of Modern Synchrotron Light Sources

ion, emittance, lattice, 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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MOT4H7

Ideas for Siberian Snakes and Spin Rotators in Very High Energy e⁺e⁻ Rings

ion, polarization, solenoid, dipole

47

S.R. Mane
Convergent Computing, Shoreham, New York, USA

The high value of the radiated power in synchrotron radiation in very high energy e⁺e⁻ storage rings presents unique challenges for the design of Siberian Snakes and spin rotators in such machines. This paper presents some ideas which may lead to a feasible design of such devices. The idea is to employ solenoids interleaved with the arc dipoles, to yield a set of noncommuting spin rotations, which can rotate an initially vertical spin to any desired direction. The solenoids should be (approximately) optically transparent, and can be 'spin matched' to the ring using known procedures. Preliminary numerical studies indicate the design may be feasible.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-MOT4H7

Export •

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

TUT3AH1

Collective Effects Issues for FCC-ee

ion, impedance, wakefield, radiation

100

M. Migliorati
University of Rome La Sapienza, Rome, Italy
E. Belli
CERN, Geneva, Switzerland
G. Castorina, B. Spataro, M. Zobov
INFN/LNF, Frascati (Roma), Italy
S. Persichelli
LBNL, Berkeley, California, USA

The Future Circular Collider study, hosted by CERN to design post-LHC particle accelerator options in a worldwide context, represents a great challenge under several aspects, which require R&D on beam dynamics and new technologies. One very critical point is represented by collective effects, generated by the interaction of the beam with self-induced electromagnetic fields, called wake fields, which could produce beam instabilities, thus reducing the machines performance and limiting the maximum stored current. It is therefore very important to be able to predict these effects and to study in detail potential solutions to counteract them. In this paper the resistive wall and some other important geometrical sources of impedance for the FCC electron-positron accelerator are identified and evaluated, and their impact on the beam dynamics, which could lead to unwanted instabilities, is discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT3AH1

Export •

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