IPAC2014 - Classification: 01 Circular and Linear Colliders / A02 Lepton Colliders

Paper	Title	Page
TUOBA03	Recent Beam-beam Effects and Luminosity at VEPP-2000	924
	D.B. Shwartz, D.E. Berkaev, A.S. Kasaev, I. Koop, A.N. Kyrpotin, A.P. Lysenko, E. Perevedentsev, V.P. Prosvetov, Yu. A. Rogovsky, A.L. Romanov, A.I. Senchenko, P.Yu. Shatunov, Y.M. Shatunov, I.M. Zemlyansky, Yu.M. Zharinov BINP SB RAS, Novosibirsk, Russia
	Funding: Work is supported by the Ministry of Education and Science of the Russian Federation, grant N 14.518.11.7003 VEPP-2000's last season was dedicated to the energy range of 160-520 MeV per beam. The application of round colliding beams concept along with the accurate orbit and lattice correction yielded the high peak luminosity of 1.210³¹ cm^-2s⁻¹ at 500 MeV with average luminosity of 0.910³¹ cm^-2s⁻¹ per run. The total beam-beam tune shift up to 0.174 was achieved in the runs at 392.5 MeV. This corresponds to beam-beam parameter ksi = 0.125 per one interaction point. The injection system is currently being upgraded to allow for the injection at the top energy of VEPP-2000 collider and to eliminate the present lack of positrons.
	Slides TUOBA03 [4.475 MB]
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WEOCA01	Construction Status of SuperKEKB	1877
	N. Ohuchi, K. Akai, H. Koiso KEK, Ibaraki, Japan
	SuperKEKB consists of 7 GeV electron and 4 GeV positron rings (HER and LER), a newly built positron damping ring and an injector linac. The target luminosity is 8x10³⁵ cm^-2s^-1, which is 40 times higher than that achieved at KEKB. Construction of SuperKEKB is progressing on schedule, and beam commissioning is scheduled in 2015. Fabrication, treatment and installation of vacuum components, magnets and power supplies, and beam diagnostic and feedback systems are ongoing. Improvement of RF system and strengthening of cooling system for magnets and beam pipes are also underway. Detailed design of the interaction region has been finalized, and final focus superconducting magnets are under production. The damping ring tunnel and buildings has been completed, and installation of the accelerator components started. The upgrade of the injector linac is also progressing. This paper describes construction status of SuperKEKB main rings and the damping ring as well as recent design progress.
	Slides WEOCA01 [6.360 MB]
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WEOCA03	DAΦNE Operation with the Upgraded KLOE-2 Detector	1883
	C. Milardi, D. Alesini, M.E. Biagini, M. Boscolo, B. Buonomo, S. Cantarella, A. De Santis, G.O. Delle Monache, G. Di Pirro, A. Drago, L.G. Foggetta, O. Frasciello, A. Gallo, A. Ghigo, F. Guatieri, S. Guiducci, F. Iungo, C. Ligi, G. Mazzitelli, L. Pellegrino, R. Ricci, U. Rotundo, C. Sanelli, G. Sensolini, M. Serio, A. Stecchi, A. Stella, M. Zobov INFN/LNF, Frascati (Roma), Italy R. Gargana, A. Michelotti Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy D.N. Shatilov BINP SB RAS, Novosibirsk, Russia M. Tobiyama KEK, Ibaraki, Japan A. Valishev Fermilab, Batavia, Illinois, USA
	The DAΦNE collider has been successfully commissioned after the experimental detector modification and a major upgrade and consolidation program involving a large part of the accelerator complex. This paper presents the Φ-Factory setup and the achieved performances in terms of beam currents, luminosity, detector background and related aspects.
	Slides WEOCA03 [2.424 MB]
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THPRI001	Design of a High Luminosity Tau/Charm Factory	3757
	M.E. Biagini, R. Boni, M. Boscolo, A. Chiarucci, R. Cimino, A. Clozza, E. Di Pasquale, A. Drago, S. Guiducci, C. Ligi, G. Mazzitelli, R. Ricci, C. Sanelli, M. Serio, A. Stella, S. Tomassini INFN/LNF, Frascati (Roma), Italy S. Bini, F. Cioeta, D. Cittadino, M. D'Agostino, M. Del Franco, A. Delle Piane, G. Frascadore, R. Gargana, S. Gazzana, S. Incremona, A. Michelotti, L. Sabbatini Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy N. Carmignani, S.M. Liuzzo, P. Raimondi ESRF, Grenoble, France R. Petronzio Università di Roma II Tor Vergata, Roma, Italy M.T.F. Pivi IMS Nanofabrication AG, Vienna, Austria G. Schillaci, M. Sedita INFN/LNS, Catania, Italy
	The design of a high luminosity Tau/Charm Factory has been accomplished by the INFN-LNF Laboratory in Frascati in collaboration with the Consortium Nicola Cabibbo Laboratory. The target luminosity is 10³⁵ cm^-2 ses⁻¹ at 4.6 GeV in the center of mass. This design is a natural evolution of the SuperB B-Factory, that was aimed to be built in the Rome Tor Vergata University campus as an Italian Flagship Project. The Tau/Charm design keeps all the features that made SuperB a state-of-the art accelerator, such as the “large Piwinski angle and crab waist sextupoles” collision scheme, the super squeezed beams, and the polarized electron beam. As a plus, it will be possible to collect data at high luminosity in a large energy range (2 to 4.6 GeV c. m.), with a peak luminosity target of 10³⁴ cm^-2 ses⁻¹ at 2 GeV. The possibility to extend the Linac for a SASE-FEL facility is also taken into account. A Conceptual Design Report* was published in September 2013. In this paper the design principles and the project features are reviewed. * Tau/Charm Factory Accelerator Report, INFN Report INFN-13-13/LNF, September 2013, arXiv:1310.6944 [physics.acc-ph]
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THPRI002	DAΦNE General Consolidation and Upgrade	3760
	C. Milardi, D. Alesini, S. Bini, B. Buonomo, S. Cantarella, A. De Santis, G.O. Delle Monache, G. Di Pirro, A. Drago, L.G. Foggetta, O. Frasciello, A. Gallo, A. Ghigo, F. Iungo, C. Ligi, L. Pellegrino, R. Ricci, U. Rotundo, C. Sanelli, G. Sensolini, A. Stecchi, A. Stella, M. Zobov INFN/LNF, Frascati (Roma), Italy R. Gargana, A. Michelotti Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy
	In the first six months of 2013 the KLOE detector has been upgraded inserting new detector layers in the inner part of the apparatus, around the interaction region. The long shutdown has been used to undertake a general consolidation program aimed at improving the Φ-Factory operation stability and reliability and, in turn, the collider uptime. In this context several systems have been revised and upgraded, new diagnostic elements have been installed, some critical components have been modified and the interaction region mechanical support structure design has been developed to improve its mechanical stability and to deal with the weight added by the new detector layers.
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THPRI003	Beam-beam Simulation Study for CEPC	3763
	Y. Zhang IHEP, Beijing, People's Republic of China K. Ohmi, D. Zhou KEK, Ibaraki, Japan D.N. Shatilov BINP SB RAS, Novosibirsk, Russia
	CEPC is an Circular Electron Positron Collider proposed to carry out high precision study on Higgs bosons. It is similar to TLEP project , the luminosity and beam lifetime may be determined by the beamstrahlung effect. We try to check the resonability of the machine parameters with weak-strong and strong-strong simulation. At the same time we also do some cross-check between different codes. We wish the work could help determine the beam parameters which could achieve design luminosity.
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THPRI004	FCC-ee/CepC Beam-beam Simulations with Beamstrahlung	3766
	K. Ohmi KEK, Ibaraki, Japan F. Zimmermann CERN, Geneva, Switzerland
	Beamstrahlung, namely synchrotron radiation emitted during the beam-beam collision, can be an important effect for circular high-energy lepton colliders such as FCC-ee (TLEP). In this paper we study beam-beam effects in the presence of energy spreading and bunch lengthening due to beamstrahlung.
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THPRI005	The Mechanical and Vibration Studies of the Final Focus Magnet-cryostat for SuperKEKB	3770
	H. Yamaoka, Y. Arimoto, K. Kanazawa, M. Masuzawa, Y. Ohsawa, N. Ohuchi, K. Tsuchiya, Z.G. Zong KEK, Ibaraki, Japan
	Construction of the SuperKEKB has been progressed in KEK. The target luminosity of the SuperKEKB is 8×1035 cm^-2s⁻¹, which is 40 times larger than the KEKB. The vertical beam sizes of electron and positron must be squeezed to the level of 50 nano-meter at the interaction point. The beam final focus system for the SuperKEKB consists of 4-superconducting (SC) quadrupole doublets, 43 SC-correctors, 4 SC-compensation solenoids. The designs of the cryostats in the left and right side with respect to the beam interaction point are being studied with the progress of the magnet designs. In the design works, the support structure of each cryostat, strength of the cryostat components and support rods for supporting cold mass are investigated. As for the vibration issue, vibration properties of the superconducting quadrupole magnets due to the ground motion has been studied. Also vibration properties of the concrete bridges where the two cryostats will be placed in the interaction region were investigated and measured. We will present the cryostat designs and these vibration studies in this paper.
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THPRI006	Dynamic Aperture Study of SuperKEKB with Beam-beam Effect	3773
	A. Morita, H. Koiso, Y. Ohnishi, K. Oide, H. Sugimoto KEK, Ibaraki, Japan
	The SuperKEKB is an asymmetric-energy double-ring collider to achieve 40 times higher luminosity than that of the KEKB B-factory. The strong non-linearity of both final focusing and beam-beam force, which are required to achieve such high luminosity, reduce dynamic aperture and limit Touschek beam lifetime. In order to achieve long enough beam lifetime for collision operation, we are studying the dynamic aperture under beam-beam effect. The study results of both dynamic aperture and Touschek beam lifetime are reported in this presentation.
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THPRI007	Lattice Optimization of BEPCII Collider Rings	3776
	Y. Zhang, Q. Qin, C.H. Yu IHEP, Beijing, People's Republic of China
	BEPCII is a double ring e⁺e⁻ collider operating in the tau-charm region. In March 2013, the peak luminosity achieves 7.0·10³² cm^-2s^-1 with a new lower alphap lattice. The beam-beam parameter is also increased from 0.033 to 0.04 with the new lattice. In this paper we'll review the lattice optimization history briefly and focus on the optimization of the lower alphap lattice.
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THPRI008	Interaction Region Lattice for FCC-ee (TLEP)	3779
	A.V. Bogomyagkov, E.B. Levichev, P.A. Piminov BINP SB RAS, Novosibirsk, Russia
	Funding: The work is supported by the Ministry of Education and Science of the Russian Federation. FCC-ee (TLEP)* project is a high-luminosity e⁺e^- collider and is an essential part of the Future Circular Collider (FCC) design study at CERN . FCC-ee is being designed to reach center-of-mass energy from 90 to 350 GeV with circumference of 80-100 km to study Higgs boson properties and perform precise measurements at the electroweak scale. It is also an intermediate step towards 100 TeV proton-proton collider built in the same tunnel. Some of the limiting factors of the new collider are total energy loss due to synchrotron radiation, beam lifetime degradation owing to beamstrahlung, geometry of the tunnel required to accommodate the successor. The present paper describes linear lattice of interaction region and results of nonlinear beam dynamics study. * M.~Koratzinos et al., ‘‘TLEP: A HIGH-PERFORMANCE CIRCULAR e⁺e⁻ COLLIDER TO STUDY THE HIGGS BOSON'', IPAC2013, Shanghai, China, TUPME040 (2013)
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THPRI010	FCC-ee Final Focus with Chromaticity Correction	3782
SUSPSNE005	use link to see paper's listing under its alternate paper code
	H. Garcia, R. Tomás, R. Tomás CERN, Geneva, Switzerland
	A 100 km circular electron-positron collider is considered as one of the possible future high energy facilities. In order to achieve a high luminosity, strong beam focusing at the Interaction Point is used requiring the correction of the chromatic aberrations. In this paper we study preliminary designs of a Final Focus System for the TLEP collider with chromatic correction. Beam orbit stability and dynamic aperture calculations are also presented.
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THPRI011	Beam-machine Interaction at TLEP: First Evaluation and Mitigation of the Synchrotron Radiation Impact	3785
	L. Lari, F. Cerutti, A. Ferrari, A. Mereghetti CERN, Geneva, Switzerland L. Lari IFIC, Valencia, Spain A. Mereghetti UMAN, Manchester, United Kingdom
	In the framework of post-LHC accelerator studies, TLEP is a proposed high-luminosity circular e⁺e⁻ collider, aimed at measuring the properties of the Higgs-boson H(126) with unprecedented accuracy, as well as those of the W boson, the Z boson and the top quark. In order to calculate the impact of synchrotron radiation, the latter has been implemented in the FLUKA code as new source term. A first account of escaping power as a function of the vacuum chamber shielding thickness, photoneutron production, and activation has been obtained for the 80km circumference 175 GeV (beam energy) TLEP option. Starting from a preliminary layout of the FODO cell and a possible dipole design, energy deposition simulations have been carried out, investigating the effectiveness of absorbers in the interconnections. The results provide inputs to improve the cell design and to support mechanical integration studies.
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THPRI012	Tuning of the Compact Linear Collider Beam Delivery System	3788
	Y.I. Levinsen, G. Giambelli, A. Latina, R. Tomás CERN, Geneva, Switzerland H. Garcia UPC, Barcelona, Spain J. Snuverink JAI, Egham, Surrey, United Kingdom
	Tuning the CLIC Beam Delivery System (BDS), and in particular the final focus, is a challenging task. In simulations without misalignments, the goal is to reach 120~\% of the nominal luminosity target, in order to allow for 10~\% loss due to static imperfections, and another 10~\% loss from dynamic imperfections. Various approaches have been considered to correct the magnet misalignments, including 1-1 correction, dispersion free steering (DFS), and several minimization methods utilizing multipole movers. In this paper we report on the recent advancements towards a feasible tuning approach that reach the required luminosity target in a reasonable time frame.
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THPRI013	A Beam Driven Plasma-wakefield Linear Collider from Higgs Factory to Multi-TeV	3791
	J.-P. Delahaye, E. Adli, S.J. Gessner, M.J. Hogan, T.O. Raubenheimer SLAC, Menlo Park, California, USA W. An, C. Joshi, W.B. Mori UCLA, Los Angeles, California, USA
	An updated design of a beam-driven Plasma Wake-Field Acceleration Linear Collider (PWFA-LC) covering a wide range of beam collision energy from Higgs factory to multi-TeV is presented. The large effective accelerating field on the order of 1 GV/m and high wall-plug to beam power transfer efficiency of the beam driven plasma technology in a continuous operation mode allows to extend linear colliders to unprecedented beam collision energies up to 10 TeV with reasonable facility extension and power consumption. An attractive scheme of an ILC energy upgrade using the PWFA technology in a pulsed mode is discussed. The major critical issues and the R&D to address their feasibility in dedicated test facilities like FACET and FACET2 are outlined, especially the beam quality preservation during acceleration and the positron acceleration. Finally, a tentative scenario of a series of staged facilities with increasing complexity starting with short term application at low energy is developed.
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THPRI030	Progress Towards Completion of the MICE Demonstration of Muon Ionization Cooling	3831
	D.M. Kaplan, P. Snopok Illinois Institute of Technology, Chicago, Illinois, USA A.J. Dobbs Imperial College of Science and Technology, Department of Physics, London, United Kingdom P. Snopok Fermilab, Batavia, Illinois, USA
	Funding: DOE, NSF, STFC, INFN, CHIPP and several others The Muon Ionization Cooling Experiment (MICE) at the Rutherford Appleton Laboratory aims to demonstrate ~10% ionization cooling of a muon beam, by its interaction with low-Z absorber materials followed by restoration of longitudinal momentum in RF linacs. MICE Step V will provide the flexibility for a thorough exploration and characterization of the performance of ionization cooling. Step V will include four RF cavities to provide 8 MV/m gradient in a strong magnetic field. This entails an RF drive system to deliver 2 MW, 1 ms pulses of 201 MHz frequency at 1 Hz repetition rate, the distribution network to deliver 1 MW to each cavity with correct RF phasing, diagnostics to determine the gradient and the muon transit phase, and development of the large diameter magnets required in order to keep the muons focused through the linacs. Progress towards the completion of Step V is described.
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Paper

Title

Page

Recent Beam-beam Effects and Luminosity at VEPP-2000

924

D.B. Shwartz, D.E. Berkaev, A.S. Kasaev, I. Koop, A.N. Kyrpotin, A.P. Lysenko, E. Perevedentsev, V.P. Prosvetov, Yu. A. Rogovsky, A.L. Romanov, A.I. Senchenko, P.Yu. Shatunov, Y.M. Shatunov, I.M. Zemlyansky, Yu.M. Zharinov
BINP SB RAS, Novosibirsk, Russia

Funding: Work is supported by the Ministry of Education and Science of the Russian Federation, grant N 14.518.11.7003
VEPP-2000's last season was dedicated to the energy range of 160-520 MeV per beam. The application of round colliding beams concept along with the accurate orbit and lattice correction yielded the high peak luminosity of 1.2*10³¹ cm^-2s⁻¹ at 500 MeV with average luminosity of 0.9*10³¹ cm^-2s⁻¹ per run. The total beam-beam tune shift up to 0.174 was achieved in the runs at 392.5 MeV. This corresponds to beam-beam parameter ksi = 0.125 per one interaction point. The injection system is currently being upgraded to allow for the injection at the top energy of VEPP-2000 collider and to eliminate the present lack of positrons.

Slides TUOBA03 [4.475 MB]

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WEOCA01

Construction Status of SuperKEKB

1877

N. Ohuchi, K. Akai, H. Koiso
KEK, Ibaraki, Japan

SuperKEKB consists of 7 GeV electron and 4 GeV positron rings (HER and LER), a newly built positron damping ring and an injector linac. The target luminosity is 8x10³⁵ cm^-2s^-1, which is 40 times higher than that achieved at KEKB. Construction of SuperKEKB is progressing on schedule, and beam commissioning is scheduled in 2015. Fabrication, treatment and installation of vacuum components, magnets and power supplies, and beam diagnostic and feedback systems are ongoing. Improvement of RF system and strengthening of cooling system for magnets and beam pipes are also underway. Detailed design of the interaction region has been finalized, and final focus superconducting magnets are under production. The damping ring tunnel and buildings has been completed, and installation of the accelerator components started. The upgrade of the injector linac is also progressing. This paper describes construction status of SuperKEKB main rings and the damping ring as well as recent design progress.

Slides WEOCA01 [6.360 MB]

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WEOCA03

DAΦNE Operation with the Upgraded KLOE-2 Detector

1883

C. Milardi, D. Alesini, M.E. Biagini, M. Boscolo, B. Buonomo, S. Cantarella, A. De Santis, G.O. Delle Monache, G. Di Pirro, A. Drago, L.G. Foggetta, O. Frasciello, A. Gallo, A. Ghigo, F. Guatieri, S. Guiducci, F. Iungo, C. Ligi, G. Mazzitelli, L. Pellegrino, R. Ricci, U. Rotundo, C. Sanelli, G. Sensolini, M. Serio, A. Stecchi, A. Stella, M. Zobov
INFN/LNF, Frascati (Roma), Italy
R. Gargana, A. Michelotti
Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy
D.N. Shatilov
BINP SB RAS, Novosibirsk, Russia
M. Tobiyama
KEK, Ibaraki, Japan
A. Valishev
Fermilab, Batavia, Illinois, USA

The DAΦNE collider has been successfully commissioned after the experimental detector modification and a major upgrade and consolidation program involving a large part of the accelerator complex. This paper presents the Φ-Factory setup and the achieved performances in terms of beam currents, luminosity, detector background and related aspects.

Slides WEOCA03 [2.424 MB]

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THPRI001

Design of a High Luminosity Tau/Charm Factory

3757

M.E. Biagini, R. Boni, M. Boscolo, A. Chiarucci, R. Cimino, A. Clozza, E. Di Pasquale, A. Drago, S. Guiducci, C. Ligi, G. Mazzitelli, R. Ricci, C. Sanelli, M. Serio, A. Stella, S. Tomassini
INFN/LNF, Frascati (Roma), Italy
S. Bini, F. Cioeta, D. Cittadino, M. D'Agostino, M. Del Franco, A. Delle Piane, G. Frascadore, R. Gargana, S. Gazzana, S. Incremona, A. Michelotti, L. Sabbatini
Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy
N. Carmignani, S.M. Liuzzo, P. Raimondi
ESRF, Grenoble, France
R. Petronzio
Università di Roma II Tor Vergata, Roma, Italy
M.T.F. Pivi
IMS Nanofabrication AG, Vienna, Austria
G. Schillaci, M. Sedita
INFN/LNS, Catania, Italy

The design of a high luminosity Tau/Charm Factory has been accomplished by the INFN-LNF Laboratory in Frascati in collaboration with the Consortium Nicola Cabibbo Laboratory. The target luminosity is 10³⁵ cm^-2 ses⁻¹ at 4.6 GeV in the center of mass. This design is a natural evolution of the SuperB B-Factory, that was aimed to be built in the Rome Tor Vergata University campus as an Italian Flagship Project. The Tau/Charm design keeps all the features that made SuperB a state-of-the art accelerator, such as the “large Piwinski angle and crab waist sextupoles” collision scheme, the super squeezed beams, and the polarized electron beam. As a plus, it will be possible to collect data at high luminosity in a large energy range (2 to 4.6 GeV c. m.), with a peak luminosity target of 10³⁴ cm^-2 ses⁻¹ at 2 GeV. The possibility to extend the Linac for a SASE-FEL facility is also taken into account. A Conceptual Design Report* was published in September 2013. In this paper the design principles and the project features are reviewed.
* Tau/Charm Factory Accelerator Report, INFN Report INFN-13-13/LNF, September 2013, arXiv:1310.6944 [physics.acc-ph]

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THPRI002

DAΦNE General Consolidation and Upgrade

3760

C. Milardi, D. Alesini, S. Bini, B. Buonomo, S. Cantarella, A. De Santis, G.O. Delle Monache, G. Di Pirro, A. Drago, L.G. Foggetta, O. Frasciello, A. Gallo, A. Ghigo, F. Iungo, C. Ligi, L. Pellegrino, R. Ricci, U. Rotundo, C. Sanelli, G. Sensolini, A. Stecchi, A. Stella, M. Zobov
INFN/LNF, Frascati (Roma), Italy
R. Gargana, A. Michelotti
Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy

In the first six months of 2013 the KLOE detector has been upgraded inserting new detector layers in the inner part of the apparatus, around the interaction region. The long shutdown has been used to undertake a general consolidation program aimed at improving the Φ-Factory operation stability and reliability and, in turn, the collider uptime. In this context several systems have been revised and upgraded, new diagnostic elements have been installed, some critical components have been modified and the interaction region mechanical support structure design has been developed to improve its mechanical stability and to deal with the weight added by the new detector layers.

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THPRI003

Beam-beam Simulation Study for CEPC

3763

Y. Zhang
IHEP, Beijing, People's Republic of China
K. Ohmi, D. Zhou
KEK, Ibaraki, Japan
D.N. Shatilov
BINP SB RAS, Novosibirsk, Russia

CEPC is an Circular Electron Positron Collider proposed to carry out high precision study on Higgs bosons. It is similar to TLEP project , the luminosity and beam lifetime may be determined by the beamstrahlung effect. We try to check the resonability of the machine parameters with weak-strong and strong-strong simulation. At the same time we also do some cross-check between different codes. We wish the work could help determine the beam parameters which could achieve design luminosity.

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THPRI004

FCC-ee/CepC Beam-beam Simulations with Beamstrahlung

3766

K. Ohmi
KEK, Ibaraki, Japan
F. Zimmermann
CERN, Geneva, Switzerland

Beamstrahlung, namely synchrotron radiation emitted during the beam-beam collision, can be an important effect for circular high-energy lepton colliders such as FCC-ee (TLEP). In this paper we study beam-beam effects in the presence of energy spreading and bunch lengthening due to beamstrahlung.

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THPRI005

The Mechanical and Vibration Studies of the Final Focus Magnet-cryostat for SuperKEKB

3770

H. Yamaoka, Y. Arimoto, K. Kanazawa, M. Masuzawa, Y. Ohsawa, N. Ohuchi, K. Tsuchiya, Z.G. Zong
KEK, Ibaraki, Japan

Construction of the SuperKEKB has been progressed in KEK. The target luminosity of the SuperKEKB is 8×1035 cm^-2s⁻¹, which is 40 times larger than the KEKB. The vertical beam sizes of electron and positron must be squeezed to the level of 50 nano-meter at the interaction point. The beam final focus system for the SuperKEKB consists of 4-superconducting (SC) quadrupole doublets, 43 SC-correctors, 4 SC-compensation solenoids. The designs of the cryostats in the left and right side with respect to the beam interaction point are being studied with the progress of the magnet designs. In the design works, the support structure of each cryostat, strength of the cryostat components and support rods for supporting cold mass are investigated. As for the vibration issue, vibration properties of the superconducting quadrupole magnets due to the ground motion has been studied. Also vibration properties of the concrete bridges where the two cryostats will be placed in the interaction region were investigated and measured. We will present the cryostat designs and these vibration studies in this paper.

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THPRI006

Dynamic Aperture Study of SuperKEKB with Beam-beam Effect

3773

A. Morita, H. Koiso, Y. Ohnishi, K. Oide, H. Sugimoto
KEK, Ibaraki, Japan

The SuperKEKB is an asymmetric-energy double-ring collider to achieve 40 times higher luminosity than that of the KEKB B-factory. The strong non-linearity of both final focusing and beam-beam force, which are required to achieve such high luminosity, reduce dynamic aperture and limit Touschek beam lifetime. In order to achieve long enough beam lifetime for collision operation, we are studying the dynamic aperture under beam-beam effect. The study results of both dynamic aperture and Touschek beam lifetime are reported in this presentation.

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THPRI007

Lattice Optimization of BEPCII Collider Rings

3776

Y. Zhang, Q. Qin, C.H. Yu
IHEP, Beijing, People's Republic of China

BEPCII is a double ring e⁺e⁻ collider operating in the tau-charm region. In March 2013, the peak luminosity achieves 7.0·10³² cm^-2s^-1 with a new lower alphap lattice. The beam-beam parameter is also increased from 0.033 to 0.04 with the new lattice. In this paper we'll review the lattice optimization history briefly and focus on the optimization of the lower alphap lattice.

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THPRI008

Interaction Region Lattice for FCC-ee (TLEP)

3779

A.V. Bogomyagkov, E.B. Levichev, P.A. Piminov
BINP SB RAS, Novosibirsk, Russia

Funding: The work is supported by the Ministry of Education and Science of the Russian Federation.
FCC-ee (TLEP)* project is a high-luminosity e⁺e^- collider and is an essential part of the Future Circular Collider (FCC) design study at CERN . FCC-ee is being designed to reach center-of-mass energy from 90 to 350 GeV with circumference of 80-100 km to study Higgs boson properties and perform precise measurements at the electroweak scale. It is also an intermediate step towards 100 TeV proton-proton collider built in the same tunnel. Some of the limiting factors of the new collider are total energy loss due to synchrotron radiation, beam lifetime degradation owing to beamstrahlung, geometry of the tunnel required to accommodate the successor. The present paper describes linear lattice of interaction region and results of nonlinear beam dynamics study.
* M.~Koratzinos et al., ‘‘TLEP: A HIGH-PERFORMANCE CIRCULAR e⁺e⁻ COLLIDER TO STUDY THE HIGGS BOSON'', IPAC2013, Shanghai, China, TUPME040 (2013)

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THPRI010

FCC-ee Final Focus with Chromaticity Correction

3782

SUSPSNE005

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H. Garcia, R. Tomás, R. Tomás
CERN, Geneva, Switzerland

A 100 km circular electron-positron collider is considered as one of the possible future high energy facilities. In order to achieve a high luminosity, strong beam focusing at the Interaction Point is used requiring the correction of the chromatic aberrations. In this paper we study preliminary designs of a Final Focus System for the TLEP collider with chromatic correction. Beam orbit stability and dynamic aperture calculations are also presented.

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THPRI011

Beam-machine Interaction at TLEP: First Evaluation and Mitigation of the Synchrotron Radiation Impact

3785

L. Lari, F. Cerutti, A. Ferrari, A. Mereghetti
CERN, Geneva, Switzerland
L. Lari
IFIC, Valencia, Spain
A. Mereghetti
UMAN, Manchester, United Kingdom

In the framework of post-LHC accelerator studies, TLEP is a proposed high-luminosity circular e⁺e⁻ collider, aimed at measuring the properties of the Higgs-boson H(126) with unprecedented accuracy, as well as those of the W boson, the Z boson and the top quark. In order to calculate the impact of synchrotron radiation, the latter has been implemented in the FLUKA code as new source term. A first account of escaping power as a function of the vacuum chamber shielding thickness, photoneutron production, and activation has been obtained for the 80km circumference 175 GeV (beam energy) TLEP option. Starting from a preliminary layout of the FODO cell and a possible dipole design, energy deposition simulations have been carried out, investigating the effectiveness of absorbers in the interconnections. The results provide inputs to improve the cell design and to support mechanical integration studies.

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THPRI012

Tuning of the Compact Linear Collider Beam Delivery System

3788

Y.I. Levinsen, G. Giambelli, A. Latina, R. Tomás
CERN, Geneva, Switzerland
H. Garcia
UPC, Barcelona, Spain
J. Snuverink
JAI, Egham, Surrey, United Kingdom

Tuning the CLIC Beam Delivery System (BDS), and in particular the final focus, is a challenging task. In simulations without misalignments, the goal is to reach 120~\% of the nominal luminosity target, in order to allow for 10~\% loss due to static imperfections, and another 10~\% loss from dynamic imperfections. Various approaches have been considered to correct the magnet misalignments, including 1-1 correction, dispersion free steering (DFS), and several minimization methods utilizing multipole movers. In this paper we report on the recent advancements towards a feasible tuning approach that reach the required luminosity target in a reasonable time frame.

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THPRI013

A Beam Driven Plasma-wakefield Linear Collider from Higgs Factory to Multi-TeV

3791

J.-P. Delahaye, E. Adli, S.J. Gessner, M.J. Hogan, T.O. Raubenheimer
SLAC, Menlo Park, California, USA
W. An, C. Joshi, W.B. Mori
UCLA, Los Angeles, California, USA

An updated design of a beam-driven Plasma Wake-Field Acceleration Linear Collider (PWFA-LC) covering a wide range of beam collision energy from Higgs factory to multi-TeV is presented. The large effective accelerating field on the order of 1 GV/m and high wall-plug to beam power transfer efficiency of the beam driven plasma technology in a continuous operation mode allows to extend linear colliders to unprecedented beam collision energies up to 10 TeV with reasonable facility extension and power consumption. An attractive scheme of an ILC energy upgrade using the PWFA technology in a pulsed mode is discussed. The major critical issues and the R&D to address their feasibility in dedicated test facilities like FACET and FACET2 are outlined, especially the beam quality preservation during acceleration and the positron acceleration. Finally, a tentative scenario of a series of staged facilities with increasing complexity starting with short term application at low energy is developed.

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THPRI030

Progress Towards Completion of the MICE Demonstration of Muon Ionization Cooling

3831

D.M. Kaplan, P. Snopok
Illinois Institute of Technology, Chicago, Illinois, USA
A.J. Dobbs
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
P. Snopok
Fermilab, Batavia, Illinois, USA

Funding: DOE, NSF, STFC, INFN, CHIPP and several others
The Muon Ionization Cooling Experiment (MICE) at the Rutherford Appleton Laboratory aims to demonstrate ~10% ionization cooling of a muon beam, by its interaction with low-Z absorber materials followed by restoration of longitudinal momentum in RF linacs. MICE Step V will provide the flexibility for a thorough exploration and characterization of the performance of ionization cooling. Step V will include four RF cavities to provide 8 MV/m gradient in a strong magnetic field. This entails an RF drive system to deliver 2 MW, 1 ms pulses of 201 MHz frequency at 1 Hz repetition rate, the distribution network to deliver 1 MW to each cavity with correct RF phasing, diagnostics to determine the gradient and the muon transit phase, and development of the large diameter magnets required in order to keep the muons focused through the linacs. Progress towards the completion of Step V is described.

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