IPAC2015 - List of Authors (Lebedev, V.A.)

Paper	Title	Page
MOPMA014	Design of Superconducting CW linac for PIP-II	565
	A. Saini, V.A. Lebedev, J.-F. Ostiguy, N. Solyak, V.P. Yakovlev Fermilab, Batavia, Illinois, USA
	Proton Improvement Plan (PIP) -II is a proposed roadmap to upgrade existing proton accelerator complex at Fermilab. It is primarily based on construction of superconducting (SC) linear accelerator (linac) that would be capable to operate in continuous wave (CW) mode. This paper will present reference design of SC linac and discuss motivations and requirements resulting in this layout and beam optics.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA014
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MOPMA020	Measurement and Correction of the Fermilab Booster Optics with LOCO	586
	C.-Y. Tan, V.A. Lebedev, A.K. Triplett Fermilab, Batavia, Illinois, USA M. McAteer CERN, Geneva, Switzerland
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. The optics of the original Booster lacked the ability for full optics correction and it was not until 2009 when new optics corrector packages were installed between gradient magnets that this ability became available. The optics correction method that is chosen is called LOCO (Linear Optics from Closed Orbits) that measures the orbit response from every beam position monitor (BPM) in the ring from every kick of every dipole corrector. The large data set collected allows LOCO to not only calculate the quadrupole and skew quadrupole currents that both reduces beta beatings and corrects coupling, it also finds the dipole kicker strengths, BPM calibrations and their tilts by minimizing the difference between the measured and ideal orbit response of the beam. The corrected optics have been loaded into Booster and it is currently being tested to be eventually used in normal operations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA020
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MOPMA041	Experimental Observation of Head-Tail Modes for Fermilab Booster	636
	T. Zolkin University of Chicago, Chicago, Illinois, USA A.V. Burov, V.A. Lebedev Fermilab, Batavia, Illinois, USA
	The Fermilab Booster is known to suffer from beam transverse instabilities. An experimental attempt of head-tail modes extraction from the stable beam motion by periodic excitement of betatron motion has been performed. The shapes of head-tail modes have been successfully obtained while eigenfrequencies separation from the betatron tune were too small to be resolved. The qualitative agreement between the theory and an experimental data has been demonstrated. This is an important step towards the understanding of general theory of collective instabilities for strong space charge case, which is a rather typical case for hadron machines.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA041
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MOPMA049	Development of a Single-pass Amplifier for an Optical Stochastic Cooling Proof-of-principle Experiment at Fermilab's IOTA facility	659
	M.B. Andorf, P. Piot Northern Illinois University, DeKalb, Illinois, USA V.A. Lebedev, P. Piot Fermilab, Batavia, Illinois, USA
	Optical stochastic cooling (OSC) is a method of beam cooling which is expected to provide cooling rates orders of magnitude larger than ordinary stochastic cooling. Light from an undulator (the pickup) is amplified and fed back onto the particle beam via another undulator (the kicker). Fermilab is currently exploring a possible proof-of-principle experiment of the OSC at the integrable-optics test accelerator (IOTA) ring. To implement effective OSC a good correction of phase distortions in the entire band of the optical amplifier is required. In this contribution we present progress in experimental characterization of phase distortions associated to a Titanium Sapphire crystal laser-gain medium (a possible candidate gain medium for the OSC experiment to be performed at IOTA). We also discuss a possible option for a mid-IR amplifier.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA049
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WEPTY019	Transverse Field Perturbation For PIP-II SRF Cavities	3302
	P. Berrutti, T.N. Khabiboulline, V.A. Lebedev, V.P. Yakovlev Fermilab, Batavia, Illinois, USA
	Funding: Work supported by D.O.E. Contract No. DE-AC02-07CH11359 Proton Improvement Plan II (PIP-II) consists in a plan for upgrading the Fermilab proton accelerator complex to a beam power capability of at least 1 MW delivered to the neutrino production target. A room temperature section accelerates H⁻ ions to 2.1 MeV and creates the desired bunch structure for injection into the superconducting (SC) linac. Five cavity types, operating at three different frequencies 162.5, 325 and 650 MHz, provide acceleration to 800 MeV. This paper presents the studies on transverse field perturbation on particle dynamic for all the superconducting cavities in the linac. The effects studied include quadrupole defocusing for coaxial resonators, and dipole kick due to couplers for elliptical cavities. A multipole expansion has been performed for each of the cavity designs including effects up to octupole.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY019
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WEPTY031	Estimation of Cryogenic Heat Loads in Cryomodule due to Thermal Radiation	3338
	A. Saini, V.A. Lebedev, N. Solyak, V.P. Yakovlev Fermilab, Batavia, Illinois, USA
	Cryogenic system is one of major cost drivers in high intensity superconducting (SC) continuous wave (CW) accelerators. Thermal radiations coming through the warm-ends of cryomodule and room temperature parts of the power coupler result in additional cryogenic heat loads. Excessive heat load in 2K environment may degrade overall performance of the cavity. In this paper we present studies performed to estimate additional heat load at 2K due to thermal radiation in 650 MHz cavity cryomodule in high energy section of PIP-II SC linac.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY031
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WEPTY051	Stripline Kicker for Integrable Optics Test Accelerator	3390
	S. A. Antipov University of Chicago, Chicago, Illinois, USA A. Didenko, V.A. Lebedev, A. Valishev Fermilab, Batavia, Illinois, USA
	Funding: Fermilab is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. We present a design of a stripline kicker for Integrable Optics Test Accelerator (IOTA). For its experimental program IOTA needs two full-aperture kickers, capable to create an arbitrary controllable kick in 2D. For that reason their strengths are variable in a wide range of amplitudes up to 16 mrad, and the pulse length 100 ns is less than a revolution period for electrons. In addition, the kicker has a physical aperture of 40 mm for a proposed operation with proton beam, and an outer size of 70 mm to fit inside existing quadrupole magnets to save space in the ring. Computer simulations using CST Microwave Studio show high field uniformity and wave impedance close to 50 Ω.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY051
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THPF116	PIP-II Status and Strategy	3982
	S.D. Holmes, P. Derwent, V.A. Lebedev, C.S. Mishra, D.V. Mitchell, V.P. Yakovlev Fermilab, Batavia, Illinois, USA
	Funding: Work supported by the Fermi Research Alliance under U.S. Department of Energy contract number DE-AC02-07CH11359 Proton Improvement Plan-II (PIP-II) is the centerpiece of Fermilab’s plan for upgrading the accelerator complex to establish the leading facility in the world for particle physics research based on intense proton beams. PIP-II has been developed to provide 1.2 MW of proton beam power at the start of operations of the Long Baseline Neutrino Experiment (LBNE), while simultaneously providing a platform for eventual extension of LBNE beam power to >2 MW and enabling future initiatives in rare processes research based on high duty factor/higher beam power operations. PIP-II is based on the construction of a new, 800 MeV, superconducting linac, augmented by improvements to the existing Booster, Recycler, and Main Injector complex. PIP-II is currently in the development stage with an R&D program underway targeting the front end and superconducting rf acceleration technologies. This paper will describe the status of the PIP-II conceptual development, the associated technology R&D programs, and the strategy for project implementation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF116
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THPF118	Fermilab Booster Injection Upgrade to 800 MeV for PIP-II	3986
	D.E. Johnson, V.A. Lebedev, I.L. Rakhno Fermilab, Batavia, Illinois, USA
	Fermilab is proposing to build an 800 MeV superconducting linac which will be used to inject H⁻ ions into the existing Booster synchrotron as part of the proposed PIP-II project. The injection energy of the Booster will be raised from the current 400 MeV to 800 MeV. Transverse phase space painting will be required due to the small linac transverse emittance (emit_ring/emit_linac ~ 10) and low average linac current of 2 mA. The painting is also helpful with reduction of beam distributions resulting in a reduction of space charge effects. The injection will require approximately 300 turns corresponding to a ~ 0.5 ms injection time. A factor of seven increase in injected beam power (relative to present operation) requires an injection waste beam absorber. The paper describes the requirements for the injection insert, itsdesign, and plans for transverse painting.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF118
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THPF119	Transfer Line Design for PIP-II Project	3989
	A. Vivoli, J. Hunt, D.E. Johnson, V.A. Lebedev Fermilab, Batavia, Illinois, USA
	The recent U.S. Particle Physics Community P5 report encouraged the realization of the Proton Improvement Plan II (PIP-II) project to support future neutrino programs in the United States. PIP-II includes the construction of a new 800 MeV H⁻ Superconducting (SC) Linac at Fermilab and an upgrade of its current accelerator complex mostly focused on upgrades of the Booster and Main Injector synchrotrons. The SC Linac will initially operate in pulsed mode at 20 Hz. The design should be compatible with upgrades to CW mode and higher energy. A new transport line will connect the Linac to the Booster. This line has to provide adequate collimation and be instrumented for beam parameter measurements. In addition, to support beam based Linac energy stabilization, the line should provide a mechanism to redirect the beam from the dump to the Booster within one pulse. In this paper we present the design of the transport line developed to meet the above requirements. Tracking simulations results are reported to confirm the validity of the design.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF119
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Design of Superconducting CW linac for PIP-II

565

A. Saini, V.A. Lebedev, J.-F. Ostiguy, N. Solyak, V.P. Yakovlev
Fermilab, Batavia, Illinois, USA

Proton Improvement Plan (PIP) -II is a proposed roadmap to upgrade existing proton accelerator complex at Fermilab. It is primarily based on construction of superconducting (SC) linear accelerator (linac) that would be capable to operate in continuous wave (CW) mode. This paper will present reference design of SC linac and discuss motivations and requirements resulting in this layout and beam optics.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA014

Export •

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

MOPMA020

Measurement and Correction of the Fermilab Booster Optics with LOCO

586

C.-Y. Tan, V.A. Lebedev, A.K. Triplett
Fermilab, Batavia, Illinois, USA
M. McAteer
CERN, Geneva, Switzerland

Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
The optics of the original Booster lacked the ability for full optics correction and it was not until 2009 when new optics corrector packages were installed between gradient magnets that this ability became available. The optics correction method that is chosen is called LOCO (Linear Optics from Closed Orbits) that measures the orbit response from every beam position monitor (BPM) in the ring from every kick of every dipole corrector. The large data set collected allows LOCO to not only calculate the quadrupole and skew quadrupole currents that both reduces beta beatings and corrects coupling, it also finds the dipole kicker strengths, BPM calibrations and their tilts by minimizing the difference between the measured and ideal orbit response of the beam. The corrected optics have been loaded into Booster and it is currently being tested to be eventually used in normal operations.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA020

Export •

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

MOPMA041

Experimental Observation of Head-Tail Modes for Fermilab Booster

636

T. Zolkin
University of Chicago, Chicago, Illinois, USA
A.V. Burov, V.A. Lebedev
Fermilab, Batavia, Illinois, USA

The Fermilab Booster is known to suffer from beam transverse instabilities. An experimental attempt of head-tail modes extraction from the stable beam motion by periodic excitement of betatron motion has been performed. The shapes of head-tail modes have been successfully obtained while eigenfrequencies separation from the betatron tune were too small to be resolved. The qualitative agreement between the theory and an experimental data has been demonstrated. This is an important step towards the understanding of general theory of collective instabilities for strong space charge case, which is a rather typical case for hadron machines.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA041

Export •

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

MOPMA049

Development of a Single-pass Amplifier for an Optical Stochastic Cooling Proof-of-principle Experiment at Fermilab's IOTA facility

659

M.B. Andorf, P. Piot
Northern Illinois University, DeKalb, Illinois, USA
V.A. Lebedev, P. Piot
Fermilab, Batavia, Illinois, USA

Optical stochastic cooling (OSC) is a method of beam cooling which is expected to provide cooling rates orders of magnitude larger than ordinary stochastic cooling. Light from an undulator (the pickup) is amplified and fed back onto the particle beam via another undulator (the kicker). Fermilab is currently exploring a possible proof-of-principle experiment of the OSC at the integrable-optics test accelerator (IOTA) ring. To implement effective OSC a good correction of phase distortions in the entire band of the optical amplifier is required. In this contribution we present progress in experimental characterization of phase distortions associated to a Titanium Sapphire crystal laser-gain medium (a possible candidate gain medium for the OSC experiment to be performed at IOTA). We also discuss a possible option for a mid-IR amplifier.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA049

Export •

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

WEPTY019

Transverse Field Perturbation For PIP-II SRF Cavities

3302

P. Berrutti, T.N. Khabiboulline, V.A. Lebedev, V.P. Yakovlev
Fermilab, Batavia, Illinois, USA

Funding: Work supported by D.O.E. Contract No. DE-AC02-07CH11359
Proton Improvement Plan II (PIP-II) consists in a plan for upgrading the Fermilab proton accelerator complex to a beam power capability of at least 1 MW delivered to the neutrino production target. A room temperature section accelerates H⁻ ions to 2.1 MeV and creates the desired bunch structure for injection into the superconducting (SC) linac. Five cavity types, operating at three different frequencies 162.5, 325 and 650 MHz, provide acceleration to 800 MeV. This paper presents the studies on transverse field perturbation on particle dynamic for all the superconducting cavities in the linac. The effects studied include quadrupole defocusing for coaxial resonators, and dipole kick due to couplers for elliptical cavities. A multipole expansion has been performed for each of the cavity designs including effects up to octupole.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY019

Export •

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

WEPTY031

Estimation of Cryogenic Heat Loads in Cryomodule due to Thermal Radiation

3338

A. Saini, V.A. Lebedev, N. Solyak, V.P. Yakovlev
Fermilab, Batavia, Illinois, USA

Cryogenic system is one of major cost drivers in high intensity superconducting (SC) continuous wave (CW) accelerators. Thermal radiations coming through the warm-ends of cryomodule and room temperature parts of the power coupler result in additional cryogenic heat loads. Excessive heat load in 2K environment may degrade overall performance of the cavity. In this paper we present studies performed to estimate additional heat load at 2K due to thermal radiation in 650 MHz cavity cryomodule in high energy section of PIP-II SC linac.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY031

Export •

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

WEPTY051

Stripline Kicker for Integrable Optics Test Accelerator

3390

S. A. Antipov
University of Chicago, Chicago, Illinois, USA
A. Didenko, V.A. Lebedev, A. Valishev
Fermilab, Batavia, Illinois, USA

Funding: Fermilab is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
We present a design of a stripline kicker for Integrable Optics Test Accelerator (IOTA). For its experimental program IOTA needs two full-aperture kickers, capable to create an arbitrary controllable kick in 2D. For that reason their strengths are variable in a wide range of amplitudes up to 16 mrad, and the pulse length 100 ns is less than a revolution period for electrons. In addition, the kicker has a physical aperture of 40 mm for a proposed operation with proton beam, and an outer size of 70 mm to fit inside existing quadrupole magnets to save space in the ring. Computer simulations using CST Microwave Studio show high field uniformity and wave impedance close to 50 Ω.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY051

Export •

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

THPF116

PIP-II Status and Strategy

3982

S.D. Holmes, P. Derwent, V.A. Lebedev, C.S. Mishra, D.V. Mitchell, V.P. Yakovlev
Fermilab, Batavia, Illinois, USA

Funding: Work supported by the Fermi Research Alliance under U.S. Department of Energy contract number DE-AC02-07CH11359
Proton Improvement Plan-II (PIP-II) is the centerpiece of Fermilab’s plan for upgrading the accelerator complex to establish the leading facility in the world for particle physics research based on intense proton beams. PIP-II has been developed to provide 1.2 MW of proton beam power at the start of operations of the Long Baseline Neutrino Experiment (LBNE), while simultaneously providing a platform for eventual extension of LBNE beam power to >2 MW and enabling future initiatives in rare processes research based on high duty factor/higher beam power operations. PIP-II is based on the construction of a new, 800 MeV, superconducting linac, augmented by improvements to the existing Booster, Recycler, and Main Injector complex. PIP-II is currently in the development stage with an R&D program underway targeting the front end and superconducting rf acceleration technologies. This paper will describe the status of the PIP-II conceptual development, the associated technology R&D programs, and the strategy for project implementation.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF116

Export •

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

THPF118

Fermilab Booster Injection Upgrade to 800 MeV for PIP-II

3986

D.E. Johnson, V.A. Lebedev, I.L. Rakhno
Fermilab, Batavia, Illinois, USA

Fermilab is proposing to build an 800 MeV superconducting linac which will be used to inject H⁻ ions into the existing Booster synchrotron as part of the proposed PIP-II project. The injection energy of the Booster will be raised from the current 400 MeV to 800 MeV. Transverse phase space painting will be required due to the small linac transverse emittance (emit_ring/emit_linac ~ 10) and low average linac current of 2 mA. The painting is also helpful with reduction of beam distributions resulting in a reduction of space charge effects. The injection will require approximately 300 turns corresponding to a ~ 0.5 ms injection time. A factor of seven increase in injected beam power (relative to present operation) requires an injection waste beam absorber. The paper describes the requirements for the injection insert, itsdesign, and plans for transverse painting.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF118

Export •

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

THPF119

Transfer Line Design for PIP-II Project

3989

A. Vivoli, J. Hunt, D.E. Johnson, V.A. Lebedev
Fermilab, Batavia, Illinois, USA

The recent U.S. Particle Physics Community P5 report encouraged the realization of the Proton Improvement Plan II (PIP-II) project to support future neutrino programs in the United States. PIP-II includes the construction of a new 800 MeV H⁻ Superconducting (SC) Linac at Fermilab and an upgrade of its current accelerator complex mostly focused on upgrades of the Booster and Main Injector synchrotrons. The SC Linac will initially operate in pulsed mode at 20 Hz. The design should be compatible with upgrades to CW mode and higher energy. A new transport line will connect the Linac to the Booster. This line has to provide adequate collimation and be instrumented for beam parameter measurements. In addition, to support beam based Linac energy stabilization, the line should provide a mechanism to redirect the beam from the dump to the Booster within one pulse. In this paper we present the design of the transport line developed to meet the above requirements. Tracking simulations results are reported to confirm the validity of the design.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF119

Export •

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