2011 Particle Accelerator Conference - List of Keywords (recirculation)

Paper	Title	Other Keywords	Page
MOP288	Progress Report on Development of the RING Cavity for Laser-based Charge Stripping of Hydrogen Ions	neutron, laser, radiation, ion	657
	R. Tikhoplav RadiaBeam, Santa Monica, USA I. Jovanovic Penn State University, University Park, Pennsylvania, USA
	Charge stripping of hydrogen ions is the first stage of any high intensity proton accelerator. To achieve higher-charge proton sources, the stripping efficiency must be improved, especially in the context of the Spallation Neutron Source at Oak Ridge National Laboratory. A method based on laser-ion interaction has a great potential for increasing efficiency. The approach of this proposed project is to design a laser cavity based on the Recirculation Injection by Nonlinear Gating (RING) technique. This paper reports on the progress of the development of the RING cavity.

WEP113	Low-Energy Run of Fermilab Electron Cooler's Beam Generation System	electron, acceleration, gun, cathode	1695
	L.R. Prost, A.V. Shemyakin Fermilab, Batavia, USA A.V. Fedotov, J. Kewisch BNL, Upton, Long Island, New York, USA
	Funding: FNAL is operated by FRA, LLC under Contract No.DE-AC02-07CH11359 with US DoE. BNL is operated by BSA, LLC under Contract No.DE-AC02-98CH10886 with US DoE. In the context of the evaluation of possibly using the Fermilab Electron Cooler for the proposed low-energy RHIC run at BNL, operating the cooler at 1.6 MeV electron beam energy was tested in a short beam line configuration. The main conclusion of this feasibility study is that the cooler's beam generation system is suitable for BNL needs. The beam recirculation was stable for all tested parameters. In particular, a beam current of 0.38 A was achieved with the cathode magnetic field up to the maximum value presently available of 250 G. The energy ripple was measured to be 40 eV. A striking difference with running the 4.3 MeV beam (nominal for operation at FNAL) is that no unprovoked beam recirculation interruptions were observed.

WEP277	Operational Findings and Upgrade Plans on the Superconducting Electron Accelerator S-DALINAC	electron, controls, linac, quadrupole	1999
	F. Hug, C. Burandt, J. Conrad, R. Eichhorn, M. Kleinmann, M. Konrad, T. Kürzeder, P.N. Nonn, N. Pietralla, S.T. Sievers TU Darmstadt, Darmstadt, Germany
	Funding: DFG through SFB 634. The S-DALINAC is a superconducting recirculating electron accelerator with a final energy of 130 MeV. It operates in cw at 3 GHz. It accelerates beams of either unpolarized or polarized electrons and is used as a source for nuclear- and astrophysical experiments at the university of Darmstadt since 1987. We will report on the operational findings, recent modifications and on the future upgrade plans: First results from the new digital rf control system, the injector current upgrade and the improved longitudinal working point will be presented. In addition, an overview of the future plans, namely installing an additional recirculation path and two scraper systems will be given.

THP002	Re-Circulated Inverse Compton Scattering X-ray Source for Industrial Applications	laser, electron, photon, cavity	2139
	A.Y. Murokh, R.B. Agustsson, S. Boucher, P. Frigola, T. Hodgetts, A.G. Ovodenko, M. Ruelas, R. Tikhoplav RadiaBeam, Santa Monica, USA M. Babzien, O.V. Chubar, T.V. Shaftan, V. Yakimenko BNL, Upton, Long Island, New York, USA I. Jovanovic Penn State University, University Park, Pennsylvania, USA
	An experiment is under way at the Accelerator Test Facility (ATF) at BNL to demonstrate inverse Compton scattering in a pulse-train regime. A photoinjector generated electron beam pulse train is scattered by a recirculating laser pulse in a novel resonant configuration termed Recirculation Injection by Nonlinear Gating (RING). The goal of the experiment is to demonstrate strong enhancement of the ICS photon flux through laser recirculation. The project status is presented, and the long-term outlook is discussed with emphasis on the medical and security applications.

Paper

Title

Other Keywords

Page

MOP288

Progress Report on Development of the RING Cavity for Laser-based Charge Stripping of Hydrogen Ions

neutron, laser, radiation, ion

657

R. Tikhoplav
RadiaBeam, Santa Monica, USA
I. Jovanovic
Penn State University, University Park, Pennsylvania, USA

Charge stripping of hydrogen ions is the first stage of any high intensity proton accelerator. To achieve higher-charge proton sources, the stripping efficiency must be improved, especially in the context of the Spallation Neutron Source at Oak Ridge National Laboratory. A method based on laser-ion interaction has a great potential for increasing efficiency. The approach of this proposed project is to design a laser cavity based on the Recirculation Injection by Nonlinear Gating (RING) technique. This paper reports on the progress of the development of the RING cavity.

WEP113

Low-Energy Run of Fermilab Electron Cooler's Beam Generation System

electron, acceleration, gun, cathode

1695

L.R. Prost, A.V. Shemyakin
Fermilab, Batavia, USA
A.V. Fedotov, J. Kewisch
BNL, Upton, Long Island, New York, USA

Funding: FNAL is operated by FRA, LLC under Contract No.DE-AC02-07CH11359 with US DoE. BNL is operated by BSA, LLC under Contract No.DE-AC02-98CH10886 with US DoE.
In the context of the evaluation of possibly using the Fermilab Electron Cooler for the proposed low-energy RHIC run at BNL, operating the cooler at 1.6 MeV electron beam energy was tested in a short beam line configuration. The main conclusion of this feasibility study is that the cooler's beam generation system is suitable for BNL needs. The beam recirculation was stable for all tested parameters. In particular, a beam current of 0.38 A was achieved with the cathode magnetic field up to the maximum value presently available of 250 G. The energy ripple was measured to be 40 eV. A striking difference with running the 4.3 MeV beam (nominal for operation at FNAL) is that no unprovoked beam recirculation interruptions were observed.

WEP277

Operational Findings and Upgrade Plans on the Superconducting Electron Accelerator S-DALINAC

electron, controls, linac, quadrupole

1999

F. Hug, C. Burandt, J. Conrad, R. Eichhorn, M. Kleinmann, M. Konrad, T. Kürzeder, P.N. Nonn, N. Pietralla, S.T. Sievers
TU Darmstadt, Darmstadt, Germany

Funding: DFG through SFB 634.
The S-DALINAC is a superconducting recirculating electron accelerator with a final energy of 130 MeV. It operates in cw at 3 GHz. It accelerates beams of either unpolarized or polarized electrons and is used as a source for nuclear- and astrophysical experiments at the university of Darmstadt since 1987. We will report on the operational findings, recent modifications and on the future upgrade plans: First results from the new digital rf control system, the injector current upgrade and the improved longitudinal working point will be presented. In addition, an overview of the future plans, namely installing an additional recirculation path and two scraper systems will be given.

THP002

Re-Circulated Inverse Compton Scattering X-ray Source for Industrial Applications

laser, electron, photon, cavity

2139

A.Y. Murokh, R.B. Agustsson, S. Boucher, P. Frigola, T. Hodgetts, A.G. Ovodenko, M. Ruelas, R. Tikhoplav
RadiaBeam, Santa Monica, USA
M. Babzien, O.V. Chubar, T.V. Shaftan, V. Yakimenko
BNL, Upton, Long Island, New York, USA
I. Jovanovic
Penn State University, University Park, Pennsylvania, USA

An experiment is under way at the Accelerator Test Facility (ATF) at BNL to demonstrate inverse Compton scattering in a pulse-train regime. A photoinjector generated electron beam pulse train is scattered by a recirculating laser pulse in a novel resonant configuration termed Recirculation Injection by Nonlinear Gating (RING). The goal of the experiment is to demonstrate strong enhancement of the ICS photon flux through laser recirculation. The project status is presented, and the long-term outlook is discussed with emphasis on the medical and security applications.