eeFACT2016 - List of Keywords (solenoid)

Paper	Title	Other Keywords	Page
MOT4H7	Ideas for Siberian Snakes and Spin Rotators in Very High Energy e⁺e⁻ Rings	ion, polarization, dipole, synchrotron	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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TUT1AH2	Design of Interaction Region and MDI at CEPC	ion, detector, background, radiation	53
	Q.L. Xiu, J. Gao, X.C. Lou, B. Sha, D. Wang, Y. Wang, H. Zhu IHEP, Bejing, People's Republic of China
	The CEPC is a proposed circular electron positron collider to study the Higgs boson more accurately. To make sure the machine works well, the compatibility of the machine and the detector is very important. In order to make sure the detector is compatible with the machine, two kinds of problems must be resolved. Firstly, the mutual influence between the machine and the detector must be well studied. It includes the beam induced background, the influence on the beam status from the detector solenoid field and so on. Secondly, the interface between the machine and the detector must be well designed, including the mechanical supporting, the procedure to assemble the interaction region and so on. In this talk, we present the recent progress of the IR design and MDI study of CEPC. The dominant sources of beam induced background have been studied and some preliminary results are obtained. The compensating solenoid and anti-solenoid will be used to suppress the influence on the beam status from the detector solenoid. A global design of the interaction region is undergoing to balance the conflict of performance between the machine and the detector.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT1AH2
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TUT1AH3	The FCC-ee Interaction Region Magnet Design	ion, quadrupole, detector, emittance	57
	M. Koratzinos DPNC, Genève, Switzerland
	The design of the region close to the interaction point of the FCC-ee experiments is especially challenging. The beams collide at an angle (±15 mrad) in the high-field region of the detector solenoid. Moreover, the very low vertical beta' of the machine necessitates that the final focusing quadrupoles have a distance from the IP (L') of around 2 m and therefore are inside the main detector solenoid. The beams should be screened from the effect of the detector magnetic field, and the emittance blow-up due to vertical dispersion in the interaction region should be minimized, while leaving enough space for detector components. Crosstalk between the two final focus quadrupoles, only about 6 cm apart at the tip, should also be eliminated.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT1AH3
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TUT3AH6	Electron Cloud at SuperKEKB	ion, electron, permanent-magnet, operation	125
	H. Fukuma, K. Ohmi, Y. Suetsugu, M. Tobiyama KEK, Ibaraki, Japan
	Several countermeasures such as ante-chambers, TiN coating, clearing electrodes, grooved structure and so on, have been taken to mitigate the electron cloud effects in the SuperKEKB positron ring. During phase 1 operation of SuperKEKB, which continued from this February to June, the electron cloud effects such as beam size blow-up, non-linear pressure increase, betatron tune shift along a bunch train and transverse coupled bunch instability were observed. Permanent magnets attached at bellows that generate longitudinal magnetic field in vacuum chambers were effective to reduce the electron cloud. This talk will cover following subjects about the electron cloud at SuperKEKB, 1) mitigation methods against the electron cloud, 2) observation of the electron cloud effects in phase 1 operation and 3) plan of further reduction of the electron cloud toward phase 2 operation which will start in the late FY2017.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT3AH6
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THS1H4	Summary of IR and MDI Session	ion, quadrupole, detector, background	200
	Y. Funakoshi KEK, Ibaraki, Japan
	A brief summary of talks in IR and MDI session is given. Also features and issues on the IR design in the future colliders are summarized.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-THS1H4
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Paper

Title

Other Keywords

Page

MOT4H7

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

ion, polarization, dipole, synchrotron

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)

TUT1AH2

Design of Interaction Region and MDI at CEPC

ion, detector, background, radiation

53

Q.L. Xiu, J. Gao, X.C. Lou, B. Sha, D. Wang, Y. Wang, H. Zhu
IHEP, Bejing, People's Republic of China

The CEPC is a proposed circular electron positron collider to study the Higgs boson more accurately. To make sure the machine works well, the compatibility of the machine and the detector is very important. In order to make sure the detector is compatible with the machine, two kinds of problems must be resolved. Firstly, the mutual influence between the machine and the detector must be well studied. It includes the beam induced background, the influence on the beam status from the detector solenoid field and so on. Secondly, the interface between the machine and the detector must be well designed, including the mechanical supporting, the procedure to assemble the interaction region and so on. In this talk, we present the recent progress of the IR design and MDI study of CEPC. The dominant sources of beam induced background have been studied and some preliminary results are obtained. The compensating solenoid and anti-solenoid will be used to suppress the influence on the beam status from the detector solenoid. A global design of the interaction region is undergoing to balance the conflict of performance between the machine and the detector.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT1AH2

Export •

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

TUT1AH3

The FCC-ee Interaction Region Magnet Design

ion, quadrupole, detector, emittance

57

M. Koratzinos
DPNC, Genève, Switzerland

The design of the region close to the interaction point of the FCC-ee experiments is especially challenging. The beams collide at an angle (±15 mrad) in the high-field region of the detector solenoid. Moreover, the very low vertical beta' of the machine necessitates that the final focusing quadrupoles have a distance from the IP (L') of around 2 m and therefore are inside the main detector solenoid. The beams should be screened from the effect of the detector magnetic field, and the emittance blow-up due to vertical dispersion in the interaction region should be minimized, while leaving enough space for detector components. Crosstalk between the two final focus quadrupoles, only about 6 cm apart at the tip, should also be eliminated.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT1AH3

Export •

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

TUT3AH6

Electron Cloud at SuperKEKB

ion, electron, permanent-magnet, operation

125

H. Fukuma, K. Ohmi, Y. Suetsugu, M. Tobiyama
KEK, Ibaraki, Japan

Several countermeasures such as ante-chambers, TiN coating, clearing electrodes, grooved structure and so on, have been taken to mitigate the electron cloud effects in the SuperKEKB positron ring. During phase 1 operation of SuperKEKB, which continued from this February to June, the electron cloud effects such as beam size blow-up, non-linear pressure increase, betatron tune shift along a bunch train and transverse coupled bunch instability were observed. Permanent magnets attached at bellows that generate longitudinal magnetic field in vacuum chambers were effective to reduce the electron cloud. This talk will cover following subjects about the electron cloud at SuperKEKB, 1) mitigation methods against the electron cloud, 2) observation of the electron cloud effects in phase 1 operation and 3) plan of further reduction of the electron cloud toward phase 2 operation which will start in the late FY2017.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT3AH6

Export •

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

THS1H4

Summary of IR and MDI Session

ion, quadrupole, detector, background

200

Y. Funakoshi
KEK, Ibaraki, Japan

A brief summary of talks in IR and MDI session is given. Also features and issues on the IR design in the future colliders are summarized.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-THS1H4

Export •

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