eeFACT2016 - List of Keywords (wiggler)

Paper	Title	Other Keywords	Page
MOT4H6	Simulations of Polarization Levels and Spin Tune Biases in High Energy Leptons Storage Rings	ion, polarization, quadrupole, alignment	43
	E. Gianfelice-Wendt Fermilab, Batavia, Illinois, USA
	Funding: Work supported by Fermi Research Alliance LLC. Under DE-AC02-07CH11359 with the U.S. DOE Simulations of polarization levels and spin tune biases in high energy leptons storage rings The use of resonant depolarization has been suggested for precise beam energy measurements in the 100 km long Future Circular Collider e⁺e⁻. The principle behind resonant depolarization is that a vertically polarized beam excited through an oscillating horizontal magnetic field gets depolarized when the excitation frequency is in a given relationship with the beam energy. In this paper the possibility of self-polarized leptons at 45 and 80 GeV is investigated. Preliminary results of simulations in presence of quadrupole misalignments and beam position monitors (BPMs) errors for a simplified ring are presented. Even in presence of errors a level of polarization useful for energy calibration seems not out of reach. However it is crucial to demonstrate that a energy measurement precision better than 100 KeV can be actually obtained. The last ring layout with 1 mm vertical beta at the IPs has been also considered. The large vertical beta in the IR quadrupoles makes the closed orbit very sensitive to their vertical misalignment and the orbit correction procedure challenging.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-MOT4H6
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TUT2H3	Design study of CEPC Booster	ion, dynamic-aperture, dipole, sextupole	79
	T.J. Bian, X. Cui, J. Gao, B. Sha, D. Wang, Y. Wang, M. Xiao, C. Zhang IHEP, Beijing, People's Republic of China Y. Cai SLAC, Menlo Park, California, USA M. Koratzinos DPNC, Genève, Switzerland F. Su Institute of High Energy Physics (IHEP), People's Republic of China
	Funding: Work supported by National Natural Science Foundation of China, Grant No. NSFC 11575218 and No. 11505198 CEPC is next generation circular collider proposed by China. The design of the full energy booster ring of the CEPC is especially challenging. The ejected beam energy is 120GeV, but the injected beam only 6GeV. In a conventional approach, the low magnetic field of the main dipole magnets creates problems. we have two ways to solve this problem, Firstly, we propose to operate the booster ring as a large wiggler at low beam energy and as a normal ring at high energies to avoid the problem of very low dipole magnet fields. Secondly, we implement the orbit correction and correct the earth field to make booster work.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT2H3
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOT4H6

Simulations of Polarization Levels and Spin Tune Biases in High Energy Leptons Storage Rings

ion, polarization, quadrupole, alignment

43

E. Gianfelice-Wendt
Fermilab, Batavia, Illinois, USA

Funding: Work supported by Fermi Research Alliance LLC. Under DE-AC02-07CH11359 with the U.S. DOE
Simulations of polarization levels and spin tune biases in high energy leptons storage rings The use of resonant depolarization has been suggested for precise beam energy measurements in the 100 km long Future Circular Collider e⁺e⁻. The principle behind resonant depolarization is that a vertically polarized beam excited through an oscillating horizontal magnetic field gets depolarized when the excitation frequency is in a given relationship with the beam energy. In this paper the possibility of self-polarized leptons at 45 and 80 GeV is investigated. Preliminary results of simulations in presence of quadrupole misalignments and beam position monitors (BPMs) errors for a simplified ring are presented. Even in presence of errors a level of polarization useful for energy calibration seems not out of reach. However it is crucial to demonstrate that a energy measurement precision better than 100 KeV can be actually obtained. The last ring layout with 1 mm vertical beta at the IPs has been also considered. The large vertical beta in the IR quadrupoles makes the closed orbit very sensitive to their vertical misalignment and the orbit correction procedure challenging.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-MOT4H6

Export •

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

TUT2H3

Design study of CEPC Booster

ion, dynamic-aperture, dipole, sextupole

79

T.J. Bian, X. Cui, J. Gao, B. Sha, D. Wang, Y. Wang, M. Xiao, C. Zhang
IHEP, Beijing, People's Republic of China
Y. Cai
SLAC, Menlo Park, California, USA
M. Koratzinos
DPNC, Genève, Switzerland
F. Su
Institute of High Energy Physics (IHEP), People's Republic of China

Funding: Work supported by National Natural Science Foundation of China, Grant No. NSFC 11575218 and No. 11505198
CEPC is next generation circular collider proposed by China. The design of the full energy booster ring of the CEPC is especially challenging. The ejected beam energy is 120GeV, but the injected beam only 6GeV. In a conventional approach, the low magnetic field of the main dipole magnets creates problems. we have two ways to solve this problem, Firstly, we propose to operate the booster ring as a large wiggler at low beam energy and as a normal ring at high energies to avoid the problem of very low dipole magnet fields. Secondly, we implement the orbit correction and correct the earth field to make booster work.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT2H3

Export •

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