eeFACT2018 - Classification: ee collider overview

Paper	Title	Page
MOYAA02	Status of DAΦNE: from KLOE-2 to SIDDHARTA-2 Experiment with Crab-Waist	23
	C. Milardi, D. Alesini, S. Bini, O.R. Blanco-García, M. Boscolo, B. Buonomo, S. Cantarella, S. Caschera, A. D’Uffizi, A. De Santis, G.O. Delle Monache, D.G.C. Di Giulio, G. Di Pirro, A. Drago, L.G. Foggetta, A. Gallo, R. Gargana, A. Ghigo, S. Guiducci, S. Incremona, F. Iungo, C. Ligi, M. Maestri, A. Michelotti, L. Pellegrino, R. Ricci, U. Rotundo, L. Sabbatini, C. Sanelli, G. Sensolini, A. Stecchi, A. Stella, A. Vannozzi, M. Zobov INFN/LNF, Frascati, Italy G. Castorina INFN-Roma1, Rome, Italy J. Chavanne, G. Le Bec, P. Raimondi ESRF, Grenoble, France
	Dafne, the Italian lepton collider, is running since more than a decade thanks to a radical revision of the approach used to deal with the beam-beam interaction: the Crab-Waist collision scheme. In this context, the collider has recently completed a long term activity program aimed at providing an unprecedented sample of data to the KLOE-2 detector, a large experimental apparatus including a high intensity solenoidal field strongly perturbing ring optics and beam dynamics. The KLOE-2 run has been undertaken with the twofold intend of collecting data for rare decay flavor physics studies, and testing the effectiveness of the new collision scheme in the presence of a strongly perturbing experimental apparatus. The performances of the collider are reviewed and the limiting factors discussed along with the preparatory phase activities planned to secure a new collider run to the SIDDHARTA-2 experiment.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYAA02
About •	paper received ※ 20 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOYAA05	The Status of CEPC	30
	C.H. Yu, S. Bai, T.J. Bian, X. Cui, J. Gao, H. Geng, D.J. Gong, D. Ji, Y.D. Liu, C. Meng, Q. Qin, D. Wang, N. Wang, Y. Wang, Y. Wei, J.Y. Zhai, Y. Zhang, H.J. Zheng, Y.S. Zhu IHEP, Beijing, People’s Republic of China
	Circular electron-positron collider (CEPC) is a dedi-cated project proposed by China to research the Higgs boson. The collider ring provides e⁺ e⁻ collision at two interaction points (IP). The luminosity for the Higgs mode at the beam energy of 120GeV is 310³⁴ cm^-2s^-1 at each IP while the synchrotron radiation (SR) power per beam is 30MW. Furthermore, CEPC is compatible with W and Z experiments, for which the beam ener-gies are 80 GeV and 45.5 GeV respectively. The lumi-nosity at the Z mode is higher than 1.710³⁵ cm^-2s^-1 per IP. Top-up operation is available during the data taking of high energy physics. The status of CEPC will be introduced in detail in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYAA05
About •	paper received ※ 23 September 2018 paper accepted ※ 08 March 2019 issue date ※ 21 April 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOYBA01	Round Colliding Beams at Vepp-2000 with Extreme Tuneshifts	34
	D.B. Shwartz, V.V. Anashin, O.V. Belikov, D.E. Berkaev, K. Gorchakov, A.S. Kasaev, A.N. Kirpotin, I. Koop, A.A. Krasnov, G.Y. Kurkin, A.P. Lysenko, S.V. Motygin, E. Perevedentsev, V.P. Prosvetov, D.V. Rabusov, Yu. A. Rogovsky, A.M. Semenov, A.I. Senchenko, D.N. Shatilov, P.Yu. Shatunov, Y.M. Shatunov, O.S. Shubina, M.V. Timoshenko, I.M. Zemlyansky, Yu.M. Zharinov BINP SB RAS, Novosibirsk, Russia I. Koop, E. Perevedentsev, Yu. A. Rogovsky, A.I. Senchenko, Y.M. Shatunov, D.B. Shwartz NSU, Novosibirsk, Russia
	VEPP-2000 is the only electron-positron collider operating with round beams that allow to enhance beam-beam limit. VEPP-2000 with SND and CMD-3 detectors carried out two successful data-taking runs after new BINP injection complex was commissioned. The 2016/2017 run was dedicated to high energy range (640-1000 MeV per beam) while the 2017/2018 run was focused at 275-600 MeV/beam energies. With sufficient positron production rate and upgraded full-energy booster the collider luminosity was limited by beam-beam effects, namely flip-flop effect. Thorough machine tuning together with new ideas introduced to suppress flip-flop allowed to achieve high beam-beam tuneshift and bunch-by-bunch luminosity values at specific beam energies. The achieved luminosity increased 2-5 times in a whole energy range in comparison to phase-1 operation (2010-2013).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYBA01
About •	paper received ※ 11 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOYBA02	Low Energy Inverse Crossing e⁺e⁻ Collider for (Mu+Mu-) Bound State Production and Study
	A.V. Bogomyagkov, V.P. Druzhinin, E.B. Levichev, A.I. Milstein, S.V. Sinyatkin BINP SB RAS, Novosibirsk, Russia
	From six leptonic atoms (e⁺e⁻), (μ+e-), (μ+μ-), (τ+e-), (τ+μ-), (τ+τ-) only positronium (e⁺e⁻) and muonium (μ+e-) were observed. Observation and study of dimuonium (μ+μ-) will test QED and quantum mechanics computations in the new regime. Dimuonium radius is 200 times smaller than positronium; therefore, it has a higher new-physics reach potential in comparison with other exotic atoms. We propose a low energy e⁺e⁻ collider for production of the not yet observed (μ+μ-) bound system. Low beam energy E(beam)=400 MeV and small circumference Π=30 m of the machine make it inexpensive to manufacture and operate. Large crossing angle (75 degrees)of e⁺e⁻ beams produces dimuonium with non-zero momentum shifting decay point from beams collision area and providing effective suppression of the main source of background – elastic e⁺e⁻ scattering. The peak luminosity at μ+μ- production threshold is 8×10³¹ cm^-2s^-1. Reversing one of the beams direction allows to study π± and η mesons with high luminosity.
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOYBA03	A Project of Super Charm-Tau Factory in Novosibirsk
	E.B. Levichev BINP SB RAS, Novosibirsk, Russia
	The paper concerns the status of the e⁺e⁻ collider Super Charm-Tau Factory at Budker INP, Novosibirsk, Russia. In particularly the issues related to the lattice design, collider performance, accelerator systems, CDR preparation, etc. are discussed. The project aims at realization a variable energy flavor factory between 2 GeV and 6 GeV in the center of mass with unprecedented luminosity of 1035 cm^-2s⁻¹ provided by a Crab Waist collision technology.
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOYBA04	Report from ARIES Muon Collider Workshop in Padua	41
	F. Zimmermann CERN, Meyrin, Switzerland M. Zanetti INFN- Sez. di Padova, Padova, Italy
	Funding: This work was supported by the European Commission under the HORIZON 2020 project ARIES no.~730871. Several novel concepts could help the muon collider become a reality. These concepts include parametric ionization cooling, low-emittance muon production by positron annihilation (LEMMA scheme), production of low-emittance muon or positron beams using the Gamma Factory concept, and strategies to upgrade large accelerator complexes, like the LHC or the FCC, into a highest-energy muon collider. The muon collider workshop organized by ARIES APEC at Padua in July 2018 gathered the international community in order to review the recent progress and to formulate a common R\&D strategy. Several important conclusions and recommendations were drawn.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYBA04
About •	paper received ※ 13 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOBB03	Progress of Preliminary Work for the Accelerators of a 2-7GeV Super Tau Charm Facility at China	76
	Q. Luo USTC/NSRL, Hefei, Anhui, People’s Republic of China
	Funding: Work supported by National Natural Science Foundation of China U1832169 and the Fundamental Research Funds for the Central Univer-sities, Grant No WK2310000046 As the most successful tau-charm factory of the world, BEPC II will celebrate its 10th birthday this year and will finish its historical mission in the next decade. Because of its very important role in high energy phys-ics study, BEPC II will certainly need a successor, a new tau-charm collider. This paper discusses the feasi-bility of a greenfield next generation tau-charm collid-er named HIEPA. The luminosity of this successor is about 5×10³⁴ cm−2s−1 pilot and 1×1035cm^-2s⁻¹ nominal, with the electron beam longitudinally polarized at the IP. The general scheme of the accelerators and the beam parameters are shown. Several key technologies such as beam polarization and beam emittance diag-nostics are also discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUOBB03
About •	paper received ※ 16 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Status of DAΦNE: from KLOE-2 to SIDDHARTA-2 Experiment with Crab-Waist

23

C. Milardi, D. Alesini, S. Bini, O.R. Blanco-García, M. Boscolo, B. Buonomo, S. Cantarella, S. Caschera, A. D’Uffizi, A. De Santis, G.O. Delle Monache, D.G.C. Di Giulio, G. Di Pirro, A. Drago, L.G. Foggetta, A. Gallo, R. Gargana, A. Ghigo, S. Guiducci, S. Incremona, F. Iungo, C. Ligi, M. Maestri, A. Michelotti, L. Pellegrino, R. Ricci, U. Rotundo, L. Sabbatini, C. Sanelli, G. Sensolini, A. Stecchi, A. Stella, A. Vannozzi, M. Zobov
INFN/LNF, Frascati, Italy
G. Castorina
INFN-Roma1, Rome, Italy
J. Chavanne, G. Le Bec, P. Raimondi
ESRF, Grenoble, France

Dafne, the Italian lepton collider, is running since more than a decade thanks to a radical revision of the approach used to deal with the beam-beam interaction: the Crab-Waist collision scheme. In this context, the collider has recently completed a long term activity program aimed at providing an unprecedented sample of data to the KLOE-2 detector, a large experimental apparatus including a high intensity solenoidal field strongly perturbing ring optics and beam dynamics. The KLOE-2 run has been undertaken with the twofold intend of collecting data for rare decay flavor physics studies, and testing the effectiveness of the new collision scheme in the presence of a strongly perturbing experimental apparatus. The performances of the collider are reviewed and the limiting factors discussed along with the preparatory phase activities planned to secure a new collider run to the SIDDHARTA-2 experiment.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYAA02

About •

paper received ※ 20 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019

Export •

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

MOYAA05

The Status of CEPC

30

C.H. Yu, S. Bai, T.J. Bian, X. Cui, J. Gao, H. Geng, D.J. Gong, D. Ji, Y.D. Liu, C. Meng, Q. Qin, D. Wang, N. Wang, Y. Wang, Y. Wei, J.Y. Zhai, Y. Zhang, H.J. Zheng, Y.S. Zhu
IHEP, Beijing, People’s Republic of China

Circular electron-positron collider (CEPC) is a dedi-cated project proposed by China to research the Higgs boson. The collider ring provides e⁺ e⁻ collision at two interaction points (IP). The luminosity for the Higgs mode at the beam energy of 120GeV is 3*10³⁴ cm^-2s^-1 at each IP while the synchrotron radiation (SR) power per beam is 30MW. Furthermore, CEPC is compatible with W and Z experiments, for which the beam ener-gies are 80 GeV and 45.5 GeV respectively. The lumi-nosity at the Z mode is higher than 1.7*10³⁵ cm^-2s^-1 per IP. Top-up operation is available during the data taking of high energy physics. The status of CEPC will be introduced in detail in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYAA05

About •

paper received ※ 23 September 2018 paper accepted ※ 08 March 2019 issue date ※ 21 April 2019

Export •

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

MOYBA01

Round Colliding Beams at Vepp-2000 with Extreme Tuneshifts

34

D.B. Shwartz, V.V. Anashin, O.V. Belikov, D.E. Berkaev, K. Gorchakov, A.S. Kasaev, A.N. Kirpotin, I. Koop, A.A. Krasnov, G.Y. Kurkin, A.P. Lysenko, S.V. Motygin, E. Perevedentsev, V.P. Prosvetov, D.V. Rabusov, Yu. A. Rogovsky, A.M. Semenov, A.I. Senchenko, D.N. Shatilov, P.Yu. Shatunov, Y.M. Shatunov, O.S. Shubina, M.V. Timoshenko, I.M. Zemlyansky, Yu.M. Zharinov
BINP SB RAS, Novosibirsk, Russia
I. Koop, E. Perevedentsev, Yu. A. Rogovsky, A.I. Senchenko, Y.M. Shatunov, D.B. Shwartz
NSU, Novosibirsk, Russia

VEPP-2000 is the only electron-positron collider operating with round beams that allow to enhance beam-beam limit. VEPP-2000 with SND and CMD-3 detectors carried out two successful data-taking runs after new BINP injection complex was commissioned. The 2016/2017 run was dedicated to high energy range (640-1000 MeV per beam) while the 2017/2018 run was focused at 275-600 MeV/beam energies. With sufficient positron production rate and upgraded full-energy booster the collider luminosity was limited by beam-beam effects, namely flip-flop effect. Thorough machine tuning together with new ideas introduced to suppress flip-flop allowed to achieve high beam-beam tuneshift and bunch-by-bunch luminosity values at specific beam energies. The achieved luminosity increased 2-5 times in a whole energy range in comparison to phase-1 operation (2010-2013).

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYBA01

About •

paper received ※ 11 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019

Export •

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

MOYBA02

Low Energy Inverse Crossing e⁺e⁻ Collider for (Mu+Mu-) Bound State Production and Study

A.V. Bogomyagkov, V.P. Druzhinin, E.B. Levichev, A.I. Milstein, S.V. Sinyatkin
BINP SB RAS, Novosibirsk, Russia

From six leptonic atoms (e⁺e⁻), (μ+e-), (μ+μ-), (τ+e-), (τ+μ-), (τ+τ-) only positronium (e⁺e⁻) and muonium (μ+e-) were observed. Observation and study of dimuonium (μ+μ-) will test QED and quantum mechanics computations in the new regime. Dimuonium radius is 200 times smaller than positronium; therefore, it has a higher new-physics reach potential in comparison with other exotic atoms. We propose a low energy e⁺e⁻ collider for production of the not yet observed (μ+μ-) bound system. Low beam energy E(beam)=400 MeV and small circumference Π=30 m of the machine make it inexpensive to manufacture and operate. Large crossing angle (75 degrees)of e⁺e⁻ beams produces dimuonium with non-zero momentum shifting decay point from beams collision area and providing effective suppression of the main source of background – elastic e⁺e⁻ scattering. The peak luminosity at μ+μ- production threshold is 8×10³¹ cm^-2s^-1. Reversing one of the beams direction allows to study π± and η mesons with high luminosity.

Export •

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

MOYBA03

A Project of Super Charm-Tau Factory in Novosibirsk

E.B. Levichev
BINP SB RAS, Novosibirsk, Russia

The paper concerns the status of the e⁺e⁻ collider Super Charm-Tau Factory at Budker INP, Novosibirsk, Russia. In particularly the issues related to the lattice design, collider performance, accelerator systems, CDR preparation, etc. are discussed. The project aims at realization a variable energy flavor factory between 2 GeV and 6 GeV in the center of mass with unprecedented luminosity of 1035 cm^-2s⁻¹ provided by a Crab Waist collision technology.

Export •

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

MOYBA04

Report from ARIES Muon Collider Workshop in Padua

41

F. Zimmermann
CERN, Meyrin, Switzerland
M. Zanetti
INFN- Sez. di Padova, Padova, Italy

Funding: This work was supported by the European Commission under the HORIZON 2020 project ARIES no.~730871.
Several novel concepts could help the muon collider become a reality. These concepts include parametric ionization cooling, low-emittance muon production by positron annihilation (LEMMA scheme), production of low-emittance muon or positron beams using the Gamma Factory concept, and strategies to upgrade large accelerator complexes, like the LHC or the FCC, into a highest-energy muon collider. The muon collider workshop organized by ARIES APEC at Padua in July 2018 gathered the international community in order to review the recent progress and to formulate a common R\&D strategy. Several important conclusions and recommendations were drawn.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYBA04

About •

paper received ※ 13 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019

Export •

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

TUOBB03

Progress of Preliminary Work for the Accelerators of a 2-7GeV Super Tau Charm Facility at China

76

Q. Luo
USTC/NSRL, Hefei, Anhui, People’s Republic of China

Funding: Work supported by National Natural Science Foundation of China U1832169 and the Fundamental Research Funds for the Central Univer-sities, Grant No WK2310000046
As the most successful tau-charm factory of the world, BEPC II will celebrate its 10th birthday this year and will finish its historical mission in the next decade. Because of its very important role in high energy phys-ics study, BEPC II will certainly need a successor, a new tau-charm collider. This paper discusses the feasi-bility of a greenfield next generation tau-charm collid-er named HIEPA. The luminosity of this successor is about 5×10³⁴ cm−2s−1 pilot and 1×1035cm^-2s⁻¹ nominal, with the electron beam longitudinally polarized at the IP. The general scheme of the accelerators and the beam parameters are shown. Several key technologies such as beam polarization and beam emittance diag-nostics are also discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUOBB03

About •

paper received ※ 16 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019

Export •

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