PAC2013 - List of Authors (Lebedev, V.A.)

Paper

Title

Page

Issues and R&D Required for the Intensity Frontier Accelerators

99

V.D. Shiltsev, S. Henderson, P. Hurh, I. Kourbanis, V.A. Lebedev, S. Nagaitsev
Fermilab, Batavia, USA

Operation, upgrade and development of accelerators for Intensity Frontier face formidable challenges in order to satisfy both the near-term and long-term Particle Physics program. The near-term program continuing throughout this decade includes the long-baseline neutrino experiments and a muon program focused on precision/rare processes. It requires: a) double the beam power capability of the Booster; b) double the beam power capability of the Main Injector; and c)build-out the muon campus infrastructure and capability based on the 8 GeV proton source. We discuss key issues and R&D required for the Intensity Frontier accelerators.

MOPMA09

Status and Opportunities at Project X: A Multi-MW Facility for Intensity Frontier Research

315

S.D. Holmes, M. Kaducak, R.D. Kephart, I. Kourbanis, V.A. Lebedev, C.S. Mishra, S. Nagaitsev, N. Solyak, R.S. Tschirhart
Fermilab, Batavia, USA

Funding: Work supported by the Fermi Research Alliance under U.S. Department of Energy contract number DE-AC02-07CH11359
Project X is a high intensity proton facility that will support a world-leading U.S. program in Intensity Frontier physics over the next several decades. Project X is currently under development by Fermilab in collaboration with national and international partners. Project X will be unique in its ability to deliver, simultaneously, up to 6 MW of site-wide beam power to multiple experiments, at energies ranging from 235 MeV to 120 GeV, and with flexible and independently controlled beam time patterns. Project X will support a wide range of experiments utilizing neutrino, muon, kaon, nucleon, and atomic probes [1,2]. In addition, Project X will lay the foundation for the long-term development of a Neutrino Factory and/or Muon Collider.

TUYAA1

The Project-X Injector Experiment: A Novel High Performance Front-end for a Future High Power Proton Facility at Fermilab

374

S. Nagaitsev, S.D. Holmes, D.E. Johnson, M. Kaducak, R.D. Kephart, V.A. Lebedev, C.S. Mishra, A.V. Shemyakin, N. Solyak, R.P. Stanek, V.P. Yakovlev
Fermilab, Batavia, USA
D. Li
LBNL, Berkeley, California, USA
S. Malhotra, M.M. Pande, P. Singh
BARC, Mumbai, India
P.N. Ostroumov
ANL, Argonne, USA

This presentation should describe the Project X Injector Experiment (PXIE)and its connection with Project X. It should focus on the novel aspects of PXIE, namely the programmable, bunch-by-bunch chopping of a CW H⁻ beam; acceleration in CW superconducting RF structures immediately following the RFQ; operation of SRF structures adjacent to a high-power chopper target; and preservation of high-quality chopped beams with acceptable emittance growth and halo.

Slides TUYAA1 [8.806 MB]

TUODA2

Test of Optical Stochastic Cooling in the IOTA Ring

422

V.A. Lebedev, Y. Tokpanov
Fermilab, Batavia, USA
M.S. Zolotorev
LBNL, Berkeley, California, USA

Funding: Work supported by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the United States Dep. of Energy
A new 150 MeV electron storage ring is being built at Fermilab. The construction of a new machine pursues two goals a test of highly non-linear integrable optics and a test of optical stochastic cooling (OSC). This paper discusses details of OSC arrangements, choice of major parameters of the cooling scheme and experimental tests of the optical amplifier prototype. The amplifier uses highly doped Ti-sapphire crystal as amplification medium. The major goal of experiments is to measure the amplifier dispersion which determines lengthening of single particle signal and the effective bandwidth of the system.

Slides TUODA2 [0.545 MB]

TUPSM10

The Conceptual Design of PXIE Vacuum System

652

A.Z. Chen, V.A. Lebedev, A.V. Shemyakin
Fermilab, Batavia, USA

Funding: under Contract No. DE-AC02-07CH11359 with the United States Department of Energy
The Project X Injector Experiment (PXIE) will be a prototype of the Project X front end that will be used to validate the design concept and decrease technical risks. It consist of a 30 kV, 5mA H⁻ ion source; LEBT; 2.1 MeV CW RFQ; MEBT that forms a desired bunch structure by removing ~80% of bunches; two SC cryomodules accelerating the beam to ~25 MeV; and a beam dump. The PXIE vacuum system faces significant technical challenges, including a large hydrogen flux from the H⁻ ion source and large outgassing from the LEBT absorber. The greatest challenge is probably to minimize the risk of degrading re-bunching RF cavities and the nearby SC cryomodule due to the migration of large gas load and microparticles from MEBT absorber. Therefore, it is important to apply low particulate vacuum practices in the vicinity of cryomodules for preventing contamination of the SC cryomodules. Differential pumping is also necessary to protect and ensure reliable operation of the beamline. The conceptual design of the vacuum system is presented in this paper.

THPHO23

Improvement of Digital Filter for the FNAL Booster Transverse Dampers

1349

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

Fermilab Booster has a transverse damping system which independently suppresses beam instabilities in the horizontal and vertical planes. A suppression of the common mode signal is achieved by digital notch filter which is based on subtracting beam positions for two consecutive turns. Such system operates well if the orbit position changes sufficiently slow. Unfortunately it is not the case for Fermilab Booster where the entire accelerating cycle consists of about 20,000 turns and successful transition crossing requires the orbit drifts up to about 10 um/turn resulting in excessive power, power amplifier saturation and loss of stability. To suppress this effect we suggest an improvement to the digital filter which can take into account fast orbit changes by using bunch positions of a few previous turns. To take into account the orbit change up to N-th order polynomial in time the system requires (N + 3) turns of "prehistory". In the case of sufficiently small gain the damping rate and the optimal digital filter coefficients are obtained analytically. Numerical simulations verify analytical theory for the small gain and predict a system performance with gain increase.

Paper	Title	Page
MOPAC16	Issues and R&D Required for the Intensity Frontier Accelerators	99
	V.D. Shiltsev, S. Henderson, P. Hurh, I. Kourbanis, V.A. Lebedev, S. Nagaitsev Fermilab, Batavia, USA
	Operation, upgrade and development of accelerators for Intensity Frontier face formidable challenges in order to satisfy both the near-term and long-term Particle Physics program. The near-term program continuing throughout this decade includes the long-baseline neutrino experiments and a muon program focused on precision/rare processes. It requires: a) double the beam power capability of the Booster; b) double the beam power capability of the Main Injector; and c)build-out the muon campus infrastructure and capability based on the 8 GeV proton source. We discuss key issues and R&D required for the Intensity Frontier accelerators.

MOPMA09	Status and Opportunities at Project X: A Multi-MW Facility for Intensity Frontier Research	315
	S.D. Holmes, M. Kaducak, R.D. Kephart, I. Kourbanis, V.A. Lebedev, C.S. Mishra, S. Nagaitsev, N. Solyak, R.S. Tschirhart Fermilab, Batavia, USA
	Funding: Work supported by the Fermi Research Alliance under U.S. Department of Energy contract number DE-AC02-07CH11359 Project X is a high intensity proton facility that will support a world-leading U.S. program in Intensity Frontier physics over the next several decades. Project X is currently under development by Fermilab in collaboration with national and international partners. Project X will be unique in its ability to deliver, simultaneously, up to 6 MW of site-wide beam power to multiple experiments, at energies ranging from 235 MeV to 120 GeV, and with flexible and independently controlled beam time patterns. Project X will support a wide range of experiments utilizing neutrino, muon, kaon, nucleon, and atomic probes [1,2]. In addition, Project X will lay the foundation for the long-term development of a Neutrino Factory and/or Muon Collider.

TUYAA1	The Project-X Injector Experiment: A Novel High Performance Front-end for a Future High Power Proton Facility at Fermilab	374
	S. Nagaitsev, S.D. Holmes, D.E. Johnson, M. Kaducak, R.D. Kephart, V.A. Lebedev, C.S. Mishra, A.V. Shemyakin, N. Solyak, R.P. Stanek, V.P. Yakovlev Fermilab, Batavia, USA D. Li LBNL, Berkeley, California, USA S. Malhotra, M.M. Pande, P. Singh BARC, Mumbai, India P.N. Ostroumov ANL, Argonne, USA
	This presentation should describe the Project X Injector Experiment (PXIE)and its connection with Project X. It should focus on the novel aspects of PXIE, namely the programmable, bunch-by-bunch chopping of a CW H⁻ beam; acceleration in CW superconducting RF structures immediately following the RFQ; operation of SRF structures adjacent to a high-power chopper target; and preservation of high-quality chopped beams with acceptable emittance growth and halo.
	Slides TUYAA1 [8.806 MB]

TUODA2	Test of Optical Stochastic Cooling in the IOTA Ring	422
	V.A. Lebedev, Y. Tokpanov Fermilab, Batavia, USA M.S. Zolotorev LBNL, Berkeley, California, USA
	Funding: Work supported by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the United States Dep. of Energy A new 150 MeV electron storage ring is being built at Fermilab. The construction of a new machine pursues two goals a test of highly non-linear integrable optics and a test of optical stochastic cooling (OSC). This paper discusses details of OSC arrangements, choice of major parameters of the cooling scheme and experimental tests of the optical amplifier prototype. The amplifier uses highly doped Ti-sapphire crystal as amplification medium. The major goal of experiments is to measure the amplifier dispersion which determines lengthening of single particle signal and the effective bandwidth of the system.
	Slides TUODA2 [0.545 MB]

TUPSM10	The Conceptual Design of PXIE Vacuum System	652
	A.Z. Chen, V.A. Lebedev, A.V. Shemyakin Fermilab, Batavia, USA
	Funding: under Contract No. DE-AC02-07CH11359 with the United States Department of Energy The Project X Injector Experiment (PXIE) will be a prototype of the Project X front end that will be used to validate the design concept and decrease technical risks. It consist of a 30 kV, 5mA H⁻ ion source; LEBT; 2.1 MeV CW RFQ; MEBT that forms a desired bunch structure by removing ~80% of bunches; two SC cryomodules accelerating the beam to ~25 MeV; and a beam dump. The PXIE vacuum system faces significant technical challenges, including a large hydrogen flux from the H⁻ ion source and large outgassing from the LEBT absorber. The greatest challenge is probably to minimize the risk of degrading re-bunching RF cavities and the nearby SC cryomodule due to the migration of large gas load and microparticles from MEBT absorber. Therefore, it is important to apply low particulate vacuum practices in the vicinity of cryomodules for preventing contamination of the SC cryomodules. Differential pumping is also necessary to protect and ensure reliable operation of the beamline. The conceptual design of the vacuum system is presented in this paper.

THPHO23	Improvement of Digital Filter for the FNAL Booster Transverse Dampers	1349
	T.V. Zolkin University of Chicago, Chicago, Illinois, USA N. Eddy, V.A. Lebedev Fermilab, Batavia, USA
	Fermilab Booster has a transverse damping system which independently suppresses beam instabilities in the horizontal and vertical planes. A suppression of the common mode signal is achieved by digital notch filter which is based on subtracting beam positions for two consecutive turns. Such system operates well if the orbit position changes sufficiently slow. Unfortunately it is not the case for Fermilab Booster where the entire accelerating cycle consists of about 20,000 turns and successful transition crossing requires the orbit drifts up to about 10 um/turn resulting in excessive power, power amplifier saturation and loss of stability. To suppress this effect we suggest an improvement to the digital filter which can take into account fast orbit changes by using bunch positions of a few previous turns. To take into account the orbit change up to N-th order polynomial in time the system requires (N + 3) turns of "prehistory". In the case of sufficiently small gain the damping rate and the optimal digital filter coefficients are obtained analytically. Numerical simulations verify analytical theory for the small gain and predict a system performance with gain increase.