RUPAC2012 - List of Keywords (collider)

Paper	Title	Other Keywords	Page
MOXCH03	NICA Project at JINR	ion, luminosity, booster, proton	5
	I.N. Meshkov JINR, Dubna, Moscow Region, Russia
	Status of the project of Nuclotron-based Ion Collider fAcility NICA/MPD (MultiPurpose Detector) under development at JINR (Dubna) is presented. The general goals of the project are providing of colliding beams for experimental studies of both hot and dense strongly interacting baryonic matter and search for the mixed phase and critical endpoint. Spin physics experimental studies in collisions of polarized protons (deuterons) are planned as the second stage of the project. The first program requires providing of heavy ion collisions in the energy range of squrt(s) = 4-11 GeV at average luminosity of L = 10²⁷ cm^-2 s⁻¹ for Au⁷⁹⁺. The polarized beams mode is proposed to be used in energy range of squart(s) = 12-27 GeV (protons) at luminosity of 10³⁰ cm^-2 s⁻¹. The key issue of the project is application of both stochastic and electron cooling methods at the NICA collider. The latter will be used in the NICA Booster for preliminary formation of the ion beam. The report contains description of the facility scheme and characteristics in heavy ion operation mode, the discussion of luminosity life time limitations, status and plans of the project development.
	Slides MOXCH03 [4.875 MB]

MOYCH02	e⁺e⁻ Collider VEPP-4M: Status and Prospects	electron, target, luminosity, synchrotron	20
	E.B. Levichev BINP SB RAS, Novosibirsk, Russia
	In the paper we discuss recent results and prospects of VEPP-4M collider in the field of high energy physics. The experimental program in the low energy range (less than 2 GeV per beam) is almost completed and in future we are going to concentrate on beam energy increase. Also we describe the VEPP-4M features for other (non-HEP) experiments including synchrotron radiation, beam test facility, accelerator physics issues, etc.
	Slides MOYCH02 [2.707 MB]

MOYCH03	Technology Developments for CLIC	quadrupole, alignment, linear-collider, klystron	25
	H. Schmickler CERN, Geneva, Switzerland
	Just after the publication of its Conceptual Design Report (CDR) the CLIC study has made detailed plans for necessary technology developments in the coming years. This program includes the development of fully working prototypes of several technical subsystems as well as first pre-series or industialization concepts of components needed in large identical quantities. The presentation will explain the development program and show in particular fields for potential collaboration.
	Slides MOYCH03 [4.792 MB]

MOBCH01	Storage, Acceleration and Short Bunched Beam Formation of 197Au+79 Ions in the NICA Collider	ion, acceleration, accumulation, emittance	30
	A.V. Eliseev, A.V. Smirnov JINR, Dubna, Moscow Region, Russia T. Katayama GSI, Darmstadt, Germany E. Kenzhbulatov, G.Y. Kurkin, V.M. Petrov, V. Volkov BINP SB RAS, Novosibirsk, Russia O.S. Kozlov, A.O. Sidorin, G.V. Trubnikov JINR/VBLHEP, Dubna, Moscow region, Russia I.N. Meshkov JINR/DLNP, Dubna, Moscow region, Russia
	The regimes of high intensity beam of 197Au⁷⁹⁺ ions in NICA Collider is considered. The first stage – ion storage is proposed to be performed with Barrier Bucket technique at ion energy of 1–3 GeV/u. Experiments in collider mode in this energy range can be performed at injection energy. For experiments at higher, up to 4.5 GeV/u, energy ions are accelerated with the same BB method. Formation of bunched beam is fulfilled in two steps – first, at 24th harmonics and then, final formation, at 72th harmonics of RF system. The possibility of achievement of designed bunch parameters is shown.
	Slides MOBCH01 [0.807 MB]

TUYCH02	Beam Cooling at NICA Collider	ion, accumulation, electron, space-charge	53
	T. Katayama GSI, Darmstadt, Germany I.N. Meshkov, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia
	At the NICA collider project it is planned to make collision of 24 short bunches, each containing around 10⁹ 197Au⁷⁹⁺ ions, at the two colliding points in the ring. The operation energy is envisaged from 1 GeV/u to 4.5 GeV/u. To prepare such beam conditions, the beam cooling technique, stochastic and electron beam, is employed at the beam accumulation from the injector Nuclotron and the following short bunch formation stage. Rather long pulse beam could be injected and accumulated in the collider with use of barrier voltage and beam cooling. After the enough beam accumulation, typically 2.4·10¹⁰, the high voltage RF with harmonic number 24 is applied to the accumulated coasting beam as well as the beam cooling which allow us to make the required short bunch of around 1nsec rms bunch length. The equilibrium condition is attained after 100~200 sec cooling, with the balance of RF force, cooling effects, IBS diffusion and the space charge repulsion force. In the present paper, detailed simulation results of beam accumulation and short bunch formation with stochastic cooling and electron cooling are presented including the space charge effects.
	Slides TUYCH02 [6.065 MB]

TUACH02	Long Term Beam Dynamics Simulation with the BETACOOL Code	electron, ion, injection, simulation	60
	A.V. Smirnov, A.O. Sidorin JINR, Dubna, Moscow Region, Russia
	General goal of the BETACOOL program is to simulate long term processes (in comparison with the ion revolution period) in the ion storage ring leading to variation of the ion distribution function in 6 dimensional phase space. The ion beam motion inside a storage ring is supposed to be stable and it is treated in linear approximation. Results of the numerical simulation of the beam dynamics for new projects FAIR (GSI, Germany) and NICA (JINR, Russia) are presented.
	Slides TUACH02 [1.004 MB]

WEZCH03	Status of the Nuclotron	ion, heavy-ion, booster, acceleration	117
	A.O. Sidorin, N.N. Agapov, A.V. Alfeev, V. Andreev, V. Batin, A.V. Butenko, D.E. Donets, E.D. Donets, A.V. Eliseev, V.V. Fimushkin, A.R. Galimov, E.V. Gorbachev, A. Govorov, E.V. Ivanov, V. Karpinsky, V.D. Kekelidze, H.G. Khodzhibagiyan, A. Kirichenko, A.G. Kobets, A.D. Kovalenko, O.S. Kozlov, N.I. Lebedev, I.N. Meshkov, V.A. Mikhailov, V. Monchinsky, S. Romanov, T.V. Rukoyatkina, N. Shurkhno, I. Slepnev, V. Slepnev, A.V. Smirnov, A. Sorin, G.V. Trubnikov, A. Tuzikov, B. Vasilishin, V. Volkov JINR, Dubna, Moscow Region, Russia O.I. Brovko, D.E. Donets, A.V. Philippov JINR/VBLHEP, Moscow, Russia
	One of the goals of present Nuclotron development is to test operational modes, diagnostic and beam control equipment required for R&D of the NICA collider elements. Main achievement in this direction are descussed. Results of the last runs of the Nuclotron operation are presented.
	Slides WEZCH03 [3.582 MB]

THAOR03	Status of the Design and Test of Superconducting Magnets for the NICA Project	booster, dipole, quadrupole, superconducting-magnet	149
	H.G. Khodzhibagiyan, P.G. Akishin, A.V. Bychkov, A. Donyagin, A.R. Galimov, O.S. Kozlov, G.L. Kuznetsov, I.N. Meshkov, V.A. Mikhaylov, E.V. Muravieva, P.I. Nikitaev, A.V. Shabunov, A.V. Smirnov, A.Y. Starikov, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia
	NICA is a new accelerator complex being under design and construction at Joint Institute for Nuclear Research in Dubna. The actual design and the main characteristics of superconducting magnets for the NICA booster and the NICA collider are given. The magnets are based on a cold window frame iron yoke and a single-layered superconducting winding made from a hollow NbTi composite superconductor cable cooled with forced two-phase helium flow. The first results of cryogenic tests of the magnets for the NICA project are presented.
	Slides THAOR03 [0.884 MB]

FRBOR02	Creating Stronger Accelerator Beams	klystron, linear-collider, positron, luminosity	216
	R.M. Kriske University of Minnesota, Minneapolis, Minnesota, USA
	Recently, at an ILC meeting in Tokyo, the Electron, Anti-Electron Beam strength was said to be about 7 milliamps, for the newest design of the planned International Linear Collider. This was about 1000 times the strength of Colliders in the last decade. This author would like to explore a different way of feeding Anti-Electrons and Electrons into a Collider that should increase the Potential Beam Strength by about 100 times. The question then is how to use Klystrons to maintain an enhanced Beam Strength and whether the larger number of Electrons and Anti-Electrons would cause too much damage to the Accelerator walls. This method should work for Protons and Anti-Protons as well.

MOPPA003	A Coaxial Two-Channel Dielectric Wakefield Structure for Two-Beam Acceleration Experiments at SLAC	wakefield, radiation, vacuum, simulation	248
	G.V. Sotnikov NSC/KIPT, Kharkov, Ukraine J.L. Hirshfield Yale University, Physics Department, New Haven, CT, USA T.C. Marshall, G.V. Sotnikov Omega-P, Inc., New Haven, USA S.V. Shchelkunov Yale University, Beam Physics Laboratory, New Haven, Connecticut, USA
	Funding: Research is supported by U.S. Department of Energy, Office of High Energy Physics Results of analytical and numerical investigations of a coaxial dielectric wakefield accelerator structure (CDWA) for experiments at FACET (SLAC) on two-beam acceleration are presented. For these experiments it is proposed to use ~1 THz structure with two nested silica cylindrical shells having these diameters: outer shell, OD = 2 mm, ID = 1 mm; inner shell OD = 360 mkm, ID = 100 mkm. A conventional CDWA structure is energized by an annular drive bunch travelling in the annular vacuum channel. At present, FACET has no drive bunch of annular shape which is required for a CDWA. However, our analytical studies and numerical simulations prove clearly that an annular drive bunch can be substituted by a solid bunch having the same charge. For the simulation we used the SLAC drive bunch parameters: energy is 23 GeV, charge is 3 nC, axial RMS size is 25 mkm, transverse RMS size is 10 mkm. This bunch sets up at the central channel axis an accelerating gradient of ~1 GeV/m. Questions of transverse stability of the solid drive and accelerated bunches in this dielectric accelerator structure are also discussed. G.V.Sotnikov, J.L. Hirshfield, T.C. Marshall, S.V. Shchelkunov, "A reciprocity principle for wakefields in a two-channel coaxial dielectric structure" IPAC’12, New Orleans, May 2012, WEPPP004.

MOPPA016	Dynamics of 197Au⁷⁸⁺ Ions Generated in Recombination with Cooling Electrons in the NICA Collider	ion, synchrotron, vacuum, electron	275
	A.V. Eliseev JINR, Dubna, Moscow Region, Russia O.S. Kozlov, A.B. Kuznetsov, A.V. Philippov, A.O. Sidorin, A. Tuzikov JINR/VBLHEP, Dubna, Moscow region, Russia I.N. Meshkov JINR/DLNP, Dubna, Moscow region, Russia
	Ions 197Au⁷⁸⁺ are generated in recombination of original bare nuclei 197Au⁷⁹⁺ with cooling electrons in the electron cooler of the NICA Collider. The ions 197Au⁷⁸⁺ dynamics is considered in the in energy range 1–4.5 GeV/u when ion beam is bunched with RF voltage (collision mode operation of the NICA Collider). It is shown that some part of 197Au⁷⁸⁺ ions can be involved in synchrotron motion when other part suffers a chaotic motion regime. Most of these ions live in vacuum chamber until further recombination in to the state of 197Au⁷⁷⁺ and leave the Collider acceptance very fast. The evolution in time of ion distribution over the Collider aperture is presented.

MOPPA017	Collider of the NICA Accelerator Complex: Optical Structure and Beam Dynamics	ion, luminosity, dipole, quadrupole	278
	O.S. Kozlov, A.V. Eliseev, H.G. Khodzhibagiyan, S.A. Kostromin, I.N. Meshkov, A.O. Sidorin, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia
	Accelerator complex NICA, developed in VBLHEP JINR, must provide an ion-ion (Au79 +) and ion-proton collisions at energies of 1-4.5 GeV/u, as well as experiments on collisions of polarized proton-proton and deuteron-deuteron beams. The calculations of the optical properties of superconducting collider rings have been aimed to create appropriate conditions for the collisions of beams and obtaining the required luminosity parameters in the working range of energies. The collider characteristics and the beam dynamics have been worked out in most for ion-ion mode of the complex.

MOPPA018	Localization of the RF Breakdown in the Parallel Coupled Accelerating Structure	cavity, coupling, acceleration, electron	281
	Y.D. Chernousov, A.M. Barnyakov, A.E. Levichev, V.M. Pavlov BINP SB RAS, Novosibirsk, Russia V. Ivannikov, I.V. Shebolaev ICKC SB RAS, Novosibirsk, Russia
	Parallel coupled accelerating structures (PCAS) with parallel RF power feeding of accelerating cavities has some features and advantages in compare with conventional traveling wave and standing wave structures with sequential RF power feeding. Parallel feeding of accelerating cavities minimizes the RF power flow via coupling slot and determines individual behavior of each cell in the regime of RF breakdown. These features can be used for developing of high gradient accelerating structures. The experimental data of the breakdown modes in the PCAS are presented.

TUPPB001	Study of Dynamical Aperture of NICA Collider with Account of Magnetic Field Errors and Coulomb Effects	resonance, simulation, ion, synchrotron	304
	P.R. Zenkevich, A. Bolshakov ITEP, Moscow, Russia
	By use of MADX code beam dynamics in NICA collider has been studied. NICA collider has comparatively small kinetic ion energies (1.5-5 GeV/u) that results in one beam Coulomb effects. These effects are simulated by set of "BEAM-BEAM" elements with appropriate chosen strength and location. Besides it was taken into account beam-beam interaction and influence of systematic and random errors of the magnetic field. The simulation results are given and discussed.

TUPPB002	Effect of Gold Nuclei Recombination in Electron Cooling System on Beam Lifetime in the NICA Collider	ion, electron, luminosity, vacuum	307
	A.V. Philippov, O.S. Kozlov, A.B. Kuznetsov, A. Tuzikov JINR/VBLHEP, Dubna, Moscow region, Russia I.N. Meshkov JINR/DLNP, Dubna, Moscow region, Russia
	On the basis of experimental data the production of the ions Au⁷⁸⁺ and Au⁷⁷⁺ as a result of step-by-step radiative recombination of bare nuclei on free electrons in the NICA Collider electron cooling system is presented. The influence of Au⁷⁸⁺ ions on the luminosity lifetime is discussed. The optimum working cycle of the NICA Collider is described.

TUPPB004	Development of Stochastic Cooling Technique for NICA Project	pick-up, kicker, ion, simulation	313
	N. Shurkhno MSU, Moscow, Russia A.G. Kobets, I.N. Meshkov, V.V. Seleznev, A.O. Sidorin, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia R. Stassen FZJ, Jülich, Germany
	The experiment on stochastic cooling at Nuclotron, initiated two years ago as a test bench for NICA collider, is progressing. Stochastic cooling system was constructed in 2011. Important results of runs performed at Nuclotron (December 2011 and March 2012) are the following: beam Shottky-noise in the energy range 0.5-4 GeV/u has been measured for deutron and carbon beams with new pick-up structure and methodology for notch-filter and system delay adjustments (open-loop measurements) have been tested. Afterwards the initial scheme was revised and significantly improved and now is being prepared for the experiment. This report presents the results of first stochastic cooling tests at Nuclotron, and further development of stochastic cooling system.

WEPPC017	Pulse Generator for the Beam Injection System of NICA Collider	kicker, power-supply, injection, pulsed-power	481
	A.A. Fateev, E.V. Gorbachev, N.I. Lebedev JINR, Dubna, Moscow Region, Russia
	The new scheme of injection kicker elements distribution is described. Parameters of the circuit main elements are estimated. The system allows to produce flat top of the injection pulse with high evenness. The suggested design allows to built reliable and cost effective injection system satisfying the project parameters.

WEPPD020	Helical 1Tx1cm Pulsed Insertion Devices for Production of Intense Polarized X- & Gamma-rays	undulator, radiation, linear-collider, polarization	596
	A.V. Smirnov RadiaBeam, Santa Monica, USA
	Two types of high-field, pulse undulators are revisited as non-coherent or partially coherent sources capable of undulator factor approaching unity at substantial gap-to-period ratios exceeding 0.4 that cannot be achieved with conventional technology. One type is a microwave square-guide, cross-polarized undulator system fed by high-power wake-fields extracted with CLIC type scheme adapted for that 2-beam undulator. Another novel ID is represented here by a bifilar transmission line energized by a high voltage, ~ns-pulse, solid-state generator. These undulators fit well radiation facilities and future linear colliders based on high-gradient microwave linac technology.

Paper

Title

Other Keywords

Page

MOXCH03

NICA Project at JINR

ion, luminosity, booster, proton

5

I.N. Meshkov
JINR, Dubna, Moscow Region, Russia

Status of the project of Nuclotron-based Ion Collider fAcility NICA/MPD (MultiPurpose Detector) under development at JINR (Dubna) is presented. The general goals of the project are providing of colliding beams for experimental studies of both hot and dense strongly interacting baryonic matter and search for the mixed phase and critical endpoint. Spin physics experimental studies in collisions of polarized protons (deuterons) are planned as the second stage of the project. The first program requires providing of heavy ion collisions in the energy range of squrt(s) = 4-11 GeV at average luminosity of L = 10²⁷ cm^-2 s⁻¹ for Au⁷⁹⁺. The polarized beams mode is proposed to be used in energy range of squart(s) = 12-27 GeV (protons) at luminosity of 10³⁰ cm^-2 s⁻¹. The key issue of the project is application of both stochastic and electron cooling methods at the NICA collider. The latter will be used in the NICA Booster for preliminary formation of the ion beam. The report contains description of the facility scheme and characteristics in heavy ion operation mode, the discussion of luminosity life time limitations, status and plans of the project development.

Slides MOXCH03 [4.875 MB]

MOYCH02

e⁺e⁻ Collider VEPP-4M: Status and Prospects

electron, target, luminosity, synchrotron

20

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

In the paper we discuss recent results and prospects of VEPP-4M collider in the field of high energy physics. The experimental program in the low energy range (less than 2 GeV per beam) is almost completed and in future we are going to concentrate on beam energy increase. Also we describe the VEPP-4M features for other (non-HEP) experiments including synchrotron radiation, beam test facility, accelerator physics issues, etc.

Slides MOYCH02 [2.707 MB]

MOYCH03

Technology Developments for CLIC

quadrupole, alignment, linear-collider, klystron

25

H. Schmickler
CERN, Geneva, Switzerland

Just after the publication of its Conceptual Design Report (CDR) the CLIC study has made detailed plans for necessary technology developments in the coming years. This program includes the development of fully working prototypes of several technical subsystems as well as first pre-series or industialization concepts of components needed in large identical quantities. The presentation will explain the development program and show in particular fields for potential collaboration.

Slides MOYCH03 [4.792 MB]

MOBCH01

Storage, Acceleration and Short Bunched Beam Formation of 197Au+79 Ions in the NICA Collider

ion, acceleration, accumulation, emittance

30

A.V. Eliseev, A.V. Smirnov
JINR, Dubna, Moscow Region, Russia
T. Katayama
GSI, Darmstadt, Germany
E. Kenzhbulatov, G.Y. Kurkin, V.M. Petrov, V. Volkov
BINP SB RAS, Novosibirsk, Russia
O.S. Kozlov, A.O. Sidorin, G.V. Trubnikov
JINR/VBLHEP, Dubna, Moscow region, Russia
I.N. Meshkov
JINR/DLNP, Dubna, Moscow region, Russia

The regimes of high intensity beam of 197Au⁷⁹⁺ ions in NICA Collider is considered. The first stage – ion storage is proposed to be performed with Barrier Bucket technique at ion energy of 1–3 GeV/u. Experiments in collider mode in this energy range can be performed at injection energy. For experiments at higher, up to 4.5 GeV/u, energy ions are accelerated with the same BB method. Formation of bunched beam is fulfilled in two steps – first, at 24th harmonics and then, final formation, at 72th harmonics of RF system. The possibility of achievement of designed bunch parameters is shown.

Slides MOBCH01 [0.807 MB]

TUYCH02

Beam Cooling at NICA Collider

ion, accumulation, electron, space-charge

53

T. Katayama
GSI, Darmstadt, Germany
I.N. Meshkov, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia

At the NICA collider project it is planned to make collision of 24 short bunches, each containing around 10⁹ 197Au⁷⁹⁺ ions, at the two colliding points in the ring. The operation energy is envisaged from 1 GeV/u to 4.5 GeV/u. To prepare such beam conditions, the beam cooling technique, stochastic and electron beam, is employed at the beam accumulation from the injector Nuclotron and the following short bunch formation stage. Rather long pulse beam could be injected and accumulated in the collider with use of barrier voltage and beam cooling. After the enough beam accumulation, typically 2.4·10¹⁰, the high voltage RF with harmonic number 24 is applied to the accumulated coasting beam as well as the beam cooling which allow us to make the required short bunch of around 1nsec rms bunch length. The equilibrium condition is attained after 100~200 sec cooling, with the balance of RF force, cooling effects, IBS diffusion and the space charge repulsion force. In the present paper, detailed simulation results of beam accumulation and short bunch formation with stochastic cooling and electron cooling are presented including the space charge effects.

Slides TUYCH02 [6.065 MB]

TUACH02

Long Term Beam Dynamics Simulation with the BETACOOL Code

electron, ion, injection, simulation

60

A.V. Smirnov, A.O. Sidorin
JINR, Dubna, Moscow Region, Russia

General goal of the BETACOOL program is to simulate long term processes (in comparison with the ion revolution period) in the ion storage ring leading to variation of the ion distribution function in 6 dimensional phase space. The ion beam motion inside a storage ring is supposed to be stable and it is treated in linear approximation. Results of the numerical simulation of the beam dynamics for new projects FAIR (GSI, Germany) and NICA (JINR, Russia) are presented.

Slides TUACH02 [1.004 MB]

WEZCH03

Status of the Nuclotron

ion, heavy-ion, booster, acceleration

117

A.O. Sidorin, N.N. Agapov, A.V. Alfeev, V. Andreev, V. Batin, A.V. Butenko, D.E. Donets, E.D. Donets, A.V. Eliseev, V.V. Fimushkin, A.R. Galimov, E.V. Gorbachev, A. Govorov, E.V. Ivanov, V. Karpinsky, V.D. Kekelidze, H.G. Khodzhibagiyan, A. Kirichenko, A.G. Kobets, A.D. Kovalenko, O.S. Kozlov, N.I. Lebedev, I.N. Meshkov, V.A. Mikhailov, V. Monchinsky, S. Romanov, T.V. Rukoyatkina, N. Shurkhno, I. Slepnev, V. Slepnev, A.V. Smirnov, A. Sorin, G.V. Trubnikov, A. Tuzikov, B. Vasilishin, V. Volkov
JINR, Dubna, Moscow Region, Russia
O.I. Brovko, D.E. Donets, A.V. Philippov
JINR/VBLHEP, Moscow, Russia

One of the goals of present Nuclotron development is to test operational modes, diagnostic and beam control equipment required for R&D of the NICA collider elements. Main achievement in this direction are descussed. Results of the last runs of the Nuclotron operation are presented.

Slides WEZCH03 [3.582 MB]

THAOR03

Status of the Design and Test of Superconducting Magnets for the NICA Project

booster, dipole, quadrupole, superconducting-magnet

149

H.G. Khodzhibagiyan, P.G. Akishin, A.V. Bychkov, A. Donyagin, A.R. Galimov, O.S. Kozlov, G.L. Kuznetsov, I.N. Meshkov, V.A. Mikhaylov, E.V. Muravieva, P.I. Nikitaev, A.V. Shabunov, A.V. Smirnov, A.Y. Starikov, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia

NICA is a new accelerator complex being under design and construction at Joint Institute for Nuclear Research in Dubna. The actual design and the main characteristics of superconducting magnets for the NICA booster and the NICA collider are given. The magnets are based on a cold window frame iron yoke and a single-layered superconducting winding made from a hollow NbTi composite superconductor cable cooled with forced two-phase helium flow. The first results of cryogenic tests of the magnets for the NICA project are presented.

Slides THAOR03 [0.884 MB]

FRBOR02

Creating Stronger Accelerator Beams

klystron, linear-collider, positron, luminosity

216

R.M. Kriske
University of Minnesota, Minneapolis, Minnesota, USA

Recently, at an ILC meeting in Tokyo, the Electron, Anti-Electron Beam strength was said to be about 7 milliamps, for the newest design of the planned International Linear Collider. This was about 1000 times the strength of Colliders in the last decade. This author would like to explore a different way of feeding Anti-Electrons and Electrons into a Collider that should increase the Potential Beam Strength by about 100 times. The question then is how to use Klystrons to maintain an enhanced Beam Strength and whether the larger number of Electrons and Anti-Electrons would cause too much damage to the Accelerator walls. This method should work for Protons and Anti-Protons as well.

MOPPA003

A Coaxial Two-Channel Dielectric Wakefield Structure for Two-Beam Acceleration Experiments at SLAC

wakefield, radiation, vacuum, simulation

248

G.V. Sotnikov
NSC/KIPT, Kharkov, Ukraine
J.L. Hirshfield
Yale University, Physics Department, New Haven, CT, USA
T.C. Marshall, G.V. Sotnikov
Omega-P, Inc., New Haven, USA
S.V. Shchelkunov
Yale University, Beam Physics Laboratory, New Haven, Connecticut, USA

Funding: Research is supported by U.S. Department of Energy, Office of High Energy Physics
Results of analytical and numerical investigations of a coaxial dielectric wakefield accelerator structure (CDWA) for experiments at FACET (SLAC) on two-beam acceleration are presented. For these experiments it is proposed to use ~1 THz structure with two nested silica cylindrical shells having these diameters: outer shell, OD = 2 mm, ID = 1 mm; inner shell OD = 360 mkm, ID = 100 mkm. A conventional CDWA structure is energized by an annular drive bunch travelling in the annular vacuum channel. At present, FACET has no drive bunch of annular shape which is required for a CDWA. However, our analytical studies and numerical simulations prove clearly that an annular drive bunch can be substituted by a solid bunch having the same charge*. For the simulation we used the SLAC drive bunch parameters: energy is 23 GeV, charge is 3 nC, axial RMS size is 25 mkm, transverse RMS size is 10 mkm. This bunch sets up at the central channel axis an accelerating gradient of ~1 GeV/m. Questions of transverse stability of the solid drive and accelerated bunches in this dielectric accelerator structure are also discussed.
*G.V.Sotnikov, J.L. Hirshfield, T.C. Marshall, S.V. Shchelkunov, "A reciprocity principle for wakefields in a two-channel coaxial dielectric structure" IPAC’12, New Orleans, May 2012, WEPPP004.

MOPPA016

Dynamics of 197Au⁷⁸⁺ Ions Generated in Recombination with Cooling Electrons in the NICA Collider

ion, synchrotron, vacuum, electron

275

A.V. Eliseev
JINR, Dubna, Moscow Region, Russia
O.S. Kozlov, A.B. Kuznetsov, A.V. Philippov, A.O. Sidorin, A. Tuzikov
JINR/VBLHEP, Dubna, Moscow region, Russia
I.N. Meshkov
JINR/DLNP, Dubna, Moscow region, Russia

Ions 197Au⁷⁸⁺ are generated in recombination of original bare nuclei 197Au⁷⁹⁺ with cooling electrons in the electron cooler of the NICA Collider. The ions 197Au⁷⁸⁺ dynamics is considered in the in energy range 1–4.5 GeV/u when ion beam is bunched with RF voltage (collision mode operation of the NICA Collider). It is shown that some part of 197Au⁷⁸⁺ ions can be involved in synchrotron motion when other part suffers a chaotic motion regime. Most of these ions live in vacuum chamber until further recombination in to the state of 197Au⁷⁷⁺ and leave the Collider acceptance very fast. The evolution in time of ion distribution over the Collider aperture is presented.

MOPPA017

Collider of the NICA Accelerator Complex: Optical Structure and Beam Dynamics

ion, luminosity, dipole, quadrupole

278

O.S. Kozlov, A.V. Eliseev, H.G. Khodzhibagiyan, S.A. Kostromin, I.N. Meshkov, A.O. Sidorin, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia

Accelerator complex NICA, developed in VBLHEP JINR, must provide an ion-ion (Au79 +) and ion-proton collisions at energies of 1-4.5 GeV/u, as well as experiments on collisions of polarized proton-proton and deuteron-deuteron beams. The calculations of the optical properties of superconducting collider rings have been aimed to create appropriate conditions for the collisions of beams and obtaining the required luminosity parameters in the working range of energies. The collider characteristics and the beam dynamics have been worked out in most for ion-ion mode of the complex.

MOPPA018

Localization of the RF Breakdown in the Parallel Coupled Accelerating Structure

cavity, coupling, acceleration, electron

281

Y.D. Chernousov, A.M. Barnyakov, A.E. Levichev, V.M. Pavlov
BINP SB RAS, Novosibirsk, Russia
V. Ivannikov, I.V. Shebolaev
ICKC SB RAS, Novosibirsk, Russia

Parallel coupled accelerating structures (PCAS) with parallel RF power feeding of accelerating cavities has some features and advantages in compare with conventional traveling wave and standing wave structures with sequential RF power feeding. Parallel feeding of accelerating cavities minimizes the RF power flow via coupling slot and determines individual behavior of each cell in the regime of RF breakdown. These features can be used for developing of high gradient accelerating structures. The experimental data of the breakdown modes in the PCAS are presented.

TUPPB001

Study of Dynamical Aperture of NICA Collider with Account of Magnetic Field Errors and Coulomb Effects

resonance, simulation, ion, synchrotron

304

P.R. Zenkevich, A. Bolshakov
ITEP, Moscow, Russia

By use of MADX code beam dynamics in NICA collider has been studied. NICA collider has comparatively small kinetic ion energies (1.5-5 GeV/u) that results in one beam Coulomb effects. These effects are simulated by set of "BEAM-BEAM" elements with appropriate chosen strength and location. Besides it was taken into account beam-beam interaction and influence of systematic and random errors of the magnetic field. The simulation results are given and discussed.

TUPPB002

Effect of Gold Nuclei Recombination in Electron Cooling System on Beam Lifetime in the NICA Collider

ion, electron, luminosity, vacuum

307

A.V. Philippov, O.S. Kozlov, A.B. Kuznetsov, A. Tuzikov
JINR/VBLHEP, Dubna, Moscow region, Russia
I.N. Meshkov
JINR/DLNP, Dubna, Moscow region, Russia

On the basis of experimental data the production of the ions Au⁷⁸⁺ and Au⁷⁷⁺ as a result of step-by-step radiative recombination of bare nuclei on free electrons in the NICA Collider electron cooling system is presented. The influence of Au⁷⁸⁺ ions on the luminosity lifetime is discussed. The optimum working cycle of the NICA Collider is described.

TUPPB004

Development of Stochastic Cooling Technique for NICA Project

pick-up, kicker, ion, simulation

313

N. Shurkhno
MSU, Moscow, Russia
A.G. Kobets, I.N. Meshkov, V.V. Seleznev, A.O. Sidorin, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia
R. Stassen
FZJ, Jülich, Germany

The experiment on stochastic cooling at Nuclotron, initiated two years ago as a test bench for NICA collider, is progressing. Stochastic cooling system was constructed in 2011. Important results of runs performed at Nuclotron (December 2011 and March 2012) are the following: beam Shottky-noise in the energy range 0.5-4 GeV/u has been measured for deutron and carbon beams with new pick-up structure and methodology for notch-filter and system delay adjustments (open-loop measurements) have been tested. Afterwards the initial scheme was revised and significantly improved and now is being prepared for the experiment. This report presents the results of first stochastic cooling tests at Nuclotron, and further development of stochastic cooling system.

WEPPC017

Pulse Generator for the Beam Injection System of NICA Collider

kicker, power-supply, injection, pulsed-power

481

A.A. Fateev, E.V. Gorbachev, N.I. Lebedev
JINR, Dubna, Moscow Region, Russia

The new scheme of injection kicker elements distribution is described. Parameters of the circuit main elements are estimated. The system allows to produce flat top of the injection pulse with high evenness. The suggested design allows to built reliable and cost effective injection system satisfying the project parameters.

WEPPD020

Helical 1Tx1cm Pulsed Insertion Devices for Production of Intense Polarized X- & Gamma-rays

undulator, radiation, linear-collider, polarization

596

A.V. Smirnov
RadiaBeam, Santa Monica, USA

Two types of high-field, pulse undulators are revisited as non-coherent or partially coherent sources capable of undulator factor approaching unity at substantial gap-to-period ratios exceeding 0.4 that cannot be achieved with conventional technology. One type is a microwave square-guide, cross-polarized undulator system fed by high-power wake-fields extracted with CLIC type scheme adapted for that 2-beam undulator. Another novel ID is represented here by a bifilar transmission line energized by a high voltage, ~ns-pulse, solid-state generator. These undulators fit well radiation facilities and future linear colliders based on high-gradient microwave linac technology.