N.G. Gavrilov

The dedicated synchrotron radiation source Siberia-2

Abstract A general presentation on the main storage ring of the SRS complex SIBERIA is given. The facility will consist of the 2.5 GeV electron ring SIBERIA-2 with 12 straight sections to accomodate insertion devices. The magnetic lattice is optimized to achieve high btightness of SR. A low horizontal emittance of 7.65×10 −6 cm rad is obtained.

The OK-5/Duke storage ring VUV FEL with variable polarization

Abstract The OK-5/Duke storage ring free electron laser (FEL) project was started in 1998. Presently, the components of the OK-5 FEL and the new South straight section are in the final stage of manufacturing. This paper describes the design and the main features of the OK-5/Duke storage ring FEL. The basic concepts and main compromises made in the design process are presented. Plans for the OK-5 FEL commissioning are discussed.

Commissioning of the booster injector synchrotron for the HIGS facility at duke university

A booster synchrotron (Duke booster) has been built and recently commissioned at Duke University Free Electron Laser Laboratory (DFELL) as part of the High Intensity Gamma-ray Source (HIGS) facility upgrade. HIGS is collaboration between the DFELL and Triangle Universities Nuclear Laboratory (TUNL). The booster provides top-off injection into the Duke FEL storage ring in the energy range of 0.24 -1.2 GeV. When operating the Duke storage ring to produce high energy Compton gamma ray beams above 20 MeV, continuous electron beam loss occurs. The lost electrons are replenished by the booster injector operating in the top-off mode. The present operational injection and extraction rate of the machine allows us to routinely replenish up to 5-108 electrons per second. The compactness of the booster posed a challenge for its development and commissioning. The booster has been successfully commissioned in 2006. This paper reports experience of commissioning and initial operation of the booster.

Helical wigglers for the OK-5 storage ring VUV FEL at Duke

Abstract In this paper, we present the design and parameters of electromagnetic wigglers with controllable polarization for the VUV OK-5/Duke storage ring FEL. The OK-5 FEL, the first distributed optical klystron, is comprised of four wigglers and three matching sections with individually controlled quadrupoles and bunchers. The geometry and the relative strength of horizontal and vertical fields determine the polarization of the radiation from the OK-5 wigglers. We compare the predicted and measured quality of the wiggler fields.

Lattice modification and nonlinear dynamics for elliptically polarized VUV OK-5 FEL source at Duke storage ring

Abstract The Duke storage ring is a light source ring optimized for driving the Free Electron Lasers (FELs). To take advantage of the high brightness of the electron beam in the storage ring, a next generation FEL source — an elliptically polarized OK-5 FEL system, has been designed to match the electron beam quality of the Duke storage ring. In this paper, we present the storage ring lattice modifications which are necessary to accommodate the 24 m long OK-5 FEL. Because of its length and strong nonlinear focusing, the OK-5 FEL is expected to have a significant impact on the electron beam dynamics. We also present the preliminary results on the dynamic aperture calculation for the OK-5 FEL operated in different modes.

Electromagnetic undulators for the VEPP-3 optical klystron

Abstract Two types of electromagnetic undulators are described. The first one has 33.5 periods with a length of 10 cm and a magnetic field amplitude of 5.3 kG. The other, developed for future FEL experiments, has 39.5 periods with 7 cm length and a magnetic field amplitude of 55 kG.

Project of a race-track microtron-recuperator for a free electron laser

Abstract A project for a race-track microtron — the beam source for a FEL — is considered. The beam, utilized in a FEL, returns to a microtron where it decelerates and releases its energy to an rf system. The energy of electrons is 35 MeV and the mean current ranges up to 0.1 A.

First UV/visible lasing with the OK-4/Duke storage-ring FEL: design and initial performance

The OK-4/Duke storage ring FEL was commissioned in November 1996 and demonstrated lasing in the near UV and visible ranges (345 - 413 nm). The OK-4 is the first storage ring FEL with the shortest wavelength and highest power for UV FELs operating in the United States. During one month of operation we have performed preliminary measurements of the main parameters of the OK-4 FEL: its gain, lasing power and temporal structure. In addition to lasing, the OK-4/Duke FEL generated a nearly monochromatic (1% FWHM) 12.2 MeV gamma-ray beam. In this paper we describe the design and initial performance of the OK-4/Duke storage ring FEL. We compare our predictions with lasing results. Our attempt to lase in the deep UV range (around 193 nm) is discussed. The OK-4 diagnostic systems and performance of its optical cavity are briefly described.

Stabilization system of synchrotron radiation beams at the VEPP-3 storage ring

Abstract The system for position stabilization of synchrotron radiation (SR) beams at the VEPP-3 storage ring (Novosibirsk, Russia) is described. The system is based on measuring, at the same place, the positions of two SR beams emitted from different points of electron orbit in the storage ring. The results of the system testing and estimations of residual orbit instability under the system control are presented, as well.

Status of the booster synchrotron for Duke FEL storage ring

In this paper we present current status of the Booster Synchrotron for the Duke FEL storage ring. The Booster which is recently under design, fabrication and construction, will provide full energy injection into the storage ring at energy from 0.3 to 1.2 GeV. The Duke storage ring FEL (SR FEL) operates in lasing mode with 193-700 nm wavelength range. The geometry of the Duke SR FEL provides for interacting head-on collision of e-beam and FEL photons. This mode of operation is used to generate intense beams of /spl gamma/-rays from 2 MeV to about 200 MeV (currently from 2 MeV to 58 MeV). Generation of /spl gamma/-rays with energy exceeding 20 MeV causes the loss of electrons, which will be replaced by injection from the Booster operating in a top-off mode. The paper presents design and status for elements of magnetic system and vacuum system, as well as design and parameters of fast extraction kicker with 11 nS pulse duration. All these element are designed and will be fabricated by Budker Institute of Nuclear Physics, Novosibirsk, Russia.