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M. Baltay

Bio: M. Baltay is an academic researcher from Stanford University. The author has contributed to research in topics: Storage ring & Particle accelerator. The author has an hindex of 6, co-authored 11 publications receiving 148 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors report on a research and development program underway and in planning at SLAC for addressing critical questions in these areas, including the construction and operation of a linac test stand for developing laser-driven photocathode rf guns with normalized emittances approaching 1 mm-mrad, development of advanced beam compression, stability, and emittance control techniques at multi-GeV energies, and the development of X-ray optics and instrumentation for extracting, modulating, and delivering photons to experimental users.
Abstract: In recent years significant studies have been initiated on the feasibility of utilizing a portion of the 3 km S-band accelerator at SLAC to drive a short wavelength (4.5−1.5 A) Linac Coherent Light Source (LCLS), a Free-Electron Laser (FEL) operating in the Self-Amplified Spontaneous Emission (SASE) regime. Electron beam requirements for single-pass saturation in a minimal time include: 1) a peak current in the 7 kA range, 2) a relative energy spread of e = λ 4π , where λ[m] is the output wavelength. Requirements on the insertion device include field error levels of 0.02% for keeping the electron bunch centered on and in phase with the amplified photons, and a focusing beta of 8 m/rad for inhibiting the dilution of its transverse density. Although much progress has been made in developing individual components and beam-processing techniques necessary for LCLS operation down to ∼20 A, a substantial amount of research and development is still required in a number of theoretical and experimental areas leading to the construction and operation of a 4.5−1.5 A LCLS. In this paper we report on a research and development program underway and in planning at SLAC for addressing critical questions in these areas. These include the construction and operation of a linac test stand for developing laser-driven photocathode rf guns with normalized emittances approaching 1 mm-mrad; development of advanced beam compression, stability, and emittance control techniques at multi-GeV energies; the construction and operation of a FEL Amplifier Test Experiment (FATE) for theoretical and experimental studies of SASE at IR wavelengths; an undulator development program to investigate superconducting, hybrid/permanent magnet (hybrid/PM), and pulsed-Cu technologies; theoretical and computational studies of high-gain FEL physics and LCLS component designs; development of X-ray optics and instrumentation for extracting, modulating, and delivering photons to experimental users; and the study and development of scientific experiments made possible by the source properties of the LCLS.

81 citations

Journal ArticleDOI
Helmut Wiedemann1, M. Baltay1, Roger Carr1, M. Hernandez1, W. Lavender1 
TL;DR: In this article, the conceptual design of a compact storage ring optimized to fit into a hospital environment and producing sufficient photon flux and monochromaticity for digital subtraction radiography is discussed.
Abstract: Beam requirements for 33 keV radiation used in digital subtraction angiography have been established through extended experimentation first at Stanford and later at the National Synchrotron Light Source in Brookhaven. So far research and development of this medical procedure to image coronary blood vessels have been undertaken on large high energy electron storage rings. With progress in this diagnostic procedure, it is interesting to look for an optimum concept for providing a 33 keV radiation source which would fit into the environment of a hospital. A variety of competing effects and technologies to produce 33 keV radiation are available, but none of these processes provides the combination of sufficient photon flux and monochromaticity except for synchrotron radiation from an electron storage ring. The conceptual design of a compact storage ring optimized to fit into a hospital environment and producing sufficient 33 keV radiation for digital subtraction radiography will be discussed.

13 citations

Proceedings ArticleDOI
06 May 1991
TL;DR: In this article, a 3-GeV injector synchrotron for the storage ring SPEAR has been constructed at the Stanford Synchoretron Radiation Laboratory, SSRL, which consists of an RF-gun, a 120-MeV linear accelerator, and associated beam transport lines.
Abstract: A dedicated 3-GeV injector synchrotron for the storage ring SPEAR has been constructed at the Stanford Synchrotron Radiation Laboratory, SSRL. The injector consists of an RF-gun, a 120-MeV linear accelerator, a 3-GeV booster synchrotron, and associated beam transport lines. General design features and special new developments for this injector are presented, together with operational performance. >

13 citations

Proceedings ArticleDOI
06 May 1991
TL;DR: A pulsed, split-parallel plate chopper has been designed, built, and installed as part of the preinjector of the Stanford Synchrotron Radiation Laboratory (SSRL) injector as mentioned in this paper.
Abstract: A pulsed, split-parallel plate chopper has been designed, built, and installed as part of the preinjector of the Stanford Synchrotron Radiation Laboratory (SSRL) injector. Its function is to allow into the linear accelerator (linac) three consecutive S-band bunches from the long bunch train provided by an RF gun. A permanent magnet deflector (PMD) at the chopper entrance deflects the beam into an absorber when the chopper pulse is off. The beam is swept across a pair of slits at the beam output end when a 7 kV, 10 ns rise-time pulse passes in the opposite direction through the 75 Omega stripline formed by the deflecting plates. Bunches exiting the slits have their trajectories corrected by another PMD, and enter the linac. Beam tests demonstrate that the chopper functions as expected. >

9 citations

Proceedings ArticleDOI
06 May 1991
TL;DR: A 120 MeV, 2856 MHz, traveling wave linear accelerator (linac), with a microwave gun, alpha magnet, and chopper, has been built at the Stanford Synchrotron Radiation Laboratory (SSRL) as a preinjector for and along with a 3 GeV, 358.54 MHz, booster synchoretron ring as mentioned in this paper.
Abstract: A 120 MeV, 2856 MHz, traveling wave linear accelerator (linac), with a microwave gun, alpha magnet, and chopper, has been built at the Stanford Synchrotron Radiation Laboratory (SSRL) as a preinjector for and along with a 3 GeV, 358.54 MHz, booster synchrotron ring. The resulting injector will be available on demand to fill the Stanford Positron-Electron Accelerator Ring (SPEAR), which is a storage ring now dedicated to synchrotron light production. A description is given of the injector's two separate and different frequency RF systems. Synchronization of the two, non-harmonic systems is achieved through the linac's chopper. Some of the interesting mechanical and electrical details are discussed and the operating characteristics of the linac and ring RF are highlighted. >

9 citations


Cited by
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Journal ArticleDOI
TL;DR: The GENESIS 1.3 simulation code as discussed by the authors uses a fully three-dimensional representation of the FEL equations in the paraxial approximation for time-dependent and steady-state simulations of single-pass FEL.
Abstract: Numerical simulation codes are basic tools for designing Free Electron Lasers (FEL). They are used to study the impact of different parameters, e.g. wiggler errors and external focusing, which allow FEL users to optimize the performance. For faster execution some simulation codes assume radial symmetry or decompose the radiation field into a few azimuthal modes, although then this treatment does not include the full description of the FEL. This contribution describes the new FEL code GENESIS 1.3 which uses a fully three-dimensional representation of the FEL equations in the paraxial approximation for time-dependent and steady-state simulations of single-pass FEL. In particular this approach is suitable for cases where the radial symmetry is broken by the electron beam distribution as well as by wiggler errors, betatron motion and off axis injection of the electron beam. The results, presented here, are based on the parameters of the TESLA Test Facility FEL at DESY.

758 citations

Journal ArticleDOI
08 Jun 2007-Science
TL;DR: This work discusses recent advances in ultrafast x-ray science and coherent imaging made possible by linear-accelerator–based light sources, and highlights the promise of ultrafastx-ray lasers, as well as the technical challenges and potential range of applications that will accompany these transformative x-Ray light sources.
Abstract: Measuring atomic-resolution images of materials with x-ray photons during chemical reactions or physical transformations resides at the technological forefront of x-ray science. New x-ray-based experimental capabilities have been closely linked with advances in x-ray sources, a trend that will continue with the impending arrival of x-ray-free electron lasers driven by electron accelerators. We discuss recent advances in ultrafast x-ray science and coherent imaging made possible by linear-accelerator-based light sources. These studies highlight the promise of ultrafast x-ray lasers, as well as the technical challenges and potential range of applications that will accompany these transformative x-ray light sources.

371 citations

Journal ArticleDOI
TL;DR: In this article, a two-stage self-amplified spontaneous emission (SASE) FEL with two undulators and an X-ray monochromator is proposed.

240 citations

Journal ArticleDOI
TL;DR: In this paper, a comprehensive analysis of the statistical properties of the radiation from a self-amplified spontaneous emission (SASE) free electron laser operating in linear and nonlinear mode is presented.

228 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented the coherent synchrotron radiation (CSR) theory for a bunch of any length moving in an arc of a finite angle and analyzed the radiative interaction of the electrons in the bunch using an ultrarelativistic approximation.
Abstract: Existing theories of coherent synchrotron radiation (CSR) are developed for the motion of an electron bunch on a circular orbit and do not describe the case of finite magnet length. In this paper we present the CSR theory for a bunch of any length moving in an arc of a finite angle. The radiative interaction of the electrons in the bunch is analyzed for a line charge distribution using an ultrarelativistic approximation. It is shown in particular that this interaction is important not only inside the magnet but also on the straight part of the trajectory after the magnet. Detailed analytical study of the CSR effects in the electron bunch with a stepped distribution of the charge density has been performed. The simple analytical technique of the radiative force calculation has been developed. The analytical solutions in the form of elementary functions are obtained for the radiative interaction force, for the energy loss distribution along the bunch and for the total energy loss of the bunch. The latter result is confirmed with calculation of the energy of coherent radiation in the far zone. The criterium for the applicable region of the existing theories to the case of a finite magnet length is obtained.

169 citations