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D. Palmer

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Last Name: Palmer

Full Name: D. Palmer

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4 papers

title: Research and development toward a 4.5-1.5 angstrom linac coherent light source (LCLS) at SLAC

format: conference procceeding

conference: 17th International Free Electron Laser Conference

year: 1996

32 authors: R. Tatchyn | J. Arthur | M. Baltay | K. Bane | R. Boyce | M. Cornacchia | T. Cremer | A. Fisher | S. J. Hahn | M. Hernandez | G. Loew | R. Miller | W. R. Nelson | H. D. Nuhn | D. Palmer | J. Paterson | T. Raubenheimer | J. Weaver | H. Wiedemann | H. Winick | C. Pellegrini | G. Travish | E. T. Scharlemann | S. Caspi | W. Fawley | K. Halbach | K. J. Kim | R. Schlueter | M. Xie | D. Meyerhofer | R. Bonifacio | L. De Salvo

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 Angstrom) 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 <0.05%, add 3) a transverse emittance, epsilon [rad-m], approximating the diffraction-limit condition epsilon=lambda/4 pi, where lambda[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 similar to 20 Angstrom, 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 Angstrom 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.

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title: Short wavelength FELs using the SLAC linac

format: journal article

year: 1994

30 authors: J. Cobb | D. Prosnitz | V. Vylet | J. Seeman | P. Pianetta | P. Morton | H. D. Nuhn | K. Bane | R. Boyce | G. Loew | R. Miller | J. Paterson | D. Palmer | T. Raubenheimer | R. Tatchyn | H. Winick | A. D. Yeremian | C. Pellegrini | J. B. Rosenzweig | G. Travish | E. T. Scharlemann | W. M. Fawley | K. Halbach | K. J. Kim | R. Schlueter | A. M. Sessler | M. Xie | R. Bonifacio | L. De Salvo | P. Pierini

abstract: We have studied the use of the SLAC linac to drive FELs at wavelengths down to a few angstroms. Lasing would be achieved in a single pass of a low emittance, high peak current, high energy eelctron beam through a long undulator by Self-Amplified-Spontaneous-Emissin (SASE). About 10(13) photons per pulse can be produced in 100 fs pulses at a 120 Hz rate, corresponding to brightness levels of about 10(22) average and 10(32) peak. Peak power levels are tens of GW. Electron energies of 10-20 GeV are required. Signifcant imporvement of FEL performance seems possible using harmonic generation techniques according to results from numerical simulations.

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title: Prospects for high power linac coherent light source (LCLS) development in the 1000 angstrom-1 angstrom wavelength range

format: conference procceeding

conference: 4th International Colloquium on X-Ray Lasers

year: 1994

26 authors: R. Tatchyn | K. Bane | R. Boyce | G. Loew | R. Miller | H. D. Nuhn | D. Palmer | J. Paterson | T. Raubenheimer | J. Seeman | H. Winick | D. Yeremian | C. Pellegrini | J. B. Rosenzweig | G. Travish | D. Prosnitz | E. T. Scharlemann | S. Caspi | W. Fawley | K. Halbach | K. J. Kim | R. Schlueter | M. Xie | R. Bonifacio | L. De Salvo | P. Pierini

abstract: Electron bunch requirements for single-pass saturation of a free-electron laser (FEL) operating at full transverse coherence in the self-amplified spontaneous emission (SASE) mode include: 1) a high peak current, 2) a sufficiently low relative energy spread, and 3) a transverse emittance epsilon (r-m) satisfying the condition epsilon <= lambda /4 pi , where lambda (m) is the output wavelength of the FEL. In the insertion device that induces the coherent amplification, the prepared electron bunch must be kept on a trajectory sufficiently collinear with the amplified photons without significant dilution of its transverse density. In this paper we discuss a Linac coherent light source (LCLS) based on a high energy accelerator such as, e.g., the 3 km S-band structure at the Stanford Linear Accelerator Center (SLAC), followed by a long high-precision undulator with superimposed quadrupole (FODO) focusing, to fulfill the given requirements for SASE operation in the 1000 angstrom-1 angstrom range. The electron source for the linac, an RF gun with a laser-excited photocathode featuring a normalized emittance in the 1-3 mm-mrad range, a longitudinal bunch duration of the order of 3 ps, and approximately 10(-9) C/bunch, is a primary determinant of the required low transverse and longitudinal emittances. Acceleration of the injected bunch to energies in the 5-25 GeV range is used to reduce the relative longitudinal energy spread in the bunch, as well as to reduce the transverse emittance to values consistent with the cited wavelength regime. Two longitudinal compression stages are employed to increase the peak bunch current to the 2-5 kA levels required for sufficiently rapid saturation. The output radiation is delivered, via a grazing-incidence mirror bank, to optical instrumentation and a multi-user beam line system. Technological requirements for LCLS operation at 40 angstroms, 4.5 angstroms, and 1.5 angstroms are examined.

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title: Status Report on SPARC Project

format: journal article

year:

96 authors: A. Renieri | M. Carpanese | F. Ciocci | G. Dattoli | A. Di Pace | A. Doria | F. Flora | G.P. Gallerano | L. Giannessi | E. Giovenale | G. Messina | L. Mezi | P.L. Ottaviani | S. Pagnutti | G. Parisi | L. Picardi | M. Quattromini | G. Ronci | C. Ronsivalle | E. Sabia | M. Sassi | A. Zucchini | D. Alesini | M. Bellaveglia | S. Bertolucci | M.E. Biagini | C. Biscari | R. Boni | M. Boscolo | M. Castellano | A. Clozza | G. Di Pirro | A. Drago | A. Esposito | M. Ferrario | D. Filippetto | V. Fusco | A. Gallo | A. Ghigo | S. Guiducci | M. Incurvati | C. Ligi | F. Marcellini | M. Migliorati | C. Milardi | L. Palumbo | L. Pellegrino | M. Preger | P. Raimondi | R. Ricci | C. Sanelli | M. Serio | F. Sgamma | B. Spataro | A. Stecchi | A. Stella | F. Tazzioli | C. Vaccarezza | M. Vescovi | C. Vicario | M. Zobov | F. Alessandria | A. Bacci | I. Boscolo | F. Broggi | S. Cialdi | C. De Martinis | D. Giove | C. Maroli | V. Petrillo | M. RomË | L. Serafini | D. Levi | M. Mattioli | G. Medici | P. Musumeci | L. Catani | E. Chiadroni | S. Tazzari | C.J. Bocchetta | M. Danailov | G. D'Auria | M. Ferianis | A. Cianchi | A. D'Angelo | R. Di Salvo | A. Fantini | D. Moricciani | C. Schaerf | S. Reiche | J.B. Rosenzweig | G. Travish | D.H. Dowell | P. Emma | C. Limborg | D. Palmer

abstract: We review the status of FEL source activity of the ongoing SPARC FEL experiment, developed within the framework of a collaboration among ENEA, CNR, INFN, INFM, Sincrotrone Trieste and University of Rome Tor Vergata. The project is aimed at realising a SASE-FEL source, operating in the visible (around 500 nm), with an extended range of tunability down to the VUV (100 nm) by the use of the mechanism of non-linear harmonic generation. The development of the relevant activities foresees the realisation of an advanced 150 MeV photo- injector source, aimed at producing a high brightness electron beams, needed to drive a SASE-FEL experiment, and a 14 m long undulator. We present the status of the design and construction of SPARC FEL device. In particular we discuss the choice of the project parameters, their optimisation and the sensitivity of the SPARC performance to any parameter variation. We will show, using start-to-end simulations, what is the impact of the e- beam and of the undulator parameters on the characteristics of the output laser field and in particular on the amount of the non-linearly generated power at higher harmonics.

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title:	Research and development toward a 4.5-1.5 angstrom linac coherent light source (LCLS) at SLAC
format:	conference procceeding
conference:	17th International Free Electron Laser Conference
year:	1996
32 authors:	R. Tatchyn \| J. Arthur \| M. Baltay \| K. Bane \| R. Boyce \| M. Cornacchia \| T. Cremer \| A. Fisher \| S. J. Hahn \| M. Hernandez \| G. Loew \| R. Miller \| W. R. Nelson \| H. D. Nuhn \| D. Palmer \| J. Paterson \| T. Raubenheimer \| J. Weaver \| H. Wiedemann \| H. Winick \| C. Pellegrini \| G. Travish \| E. T. Scharlemann \| S. Caspi \| W. Fawley \| K. Halbach \| K. J. Kim \| R. Schlueter \| M. Xie \| D. Meyerhofer \| R. Bonifacio \| L. De Salvo
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 Angstrom) 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 <0.05%, add 3) a transverse emittance, epsilon [rad-m], approximating the diffraction-limit condition epsilon=lambda/4 pi, where lambda[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 similar to 20 Angstrom, 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 Angstrom 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.
keywords:
Download \| View \| Details \| edit \| delete

title:	Short wavelength FELs using the SLAC linac
format:	journal article
year:	1994
30 authors:	J. Cobb \| D. Prosnitz \| V. Vylet \| J. Seeman \| P. Pianetta \| P. Morton \| H. D. Nuhn \| K. Bane \| R. Boyce \| G. Loew \| R. Miller \| J. Paterson \| D. Palmer \| T. Raubenheimer \| R. Tatchyn \| H. Winick \| A. D. Yeremian \| C. Pellegrini \| J. B. Rosenzweig \| G. Travish \| E. T. Scharlemann \| W. M. Fawley \| K. Halbach \| K. J. Kim \| R. Schlueter \| A. M. Sessler \| M. Xie \| R. Bonifacio \| L. De Salvo \| P. Pierini
abstract:	We have studied the use of the SLAC linac to drive FELs at wavelengths down to a few angstroms. Lasing would be achieved in a single pass of a low emittance, high peak current, high energy eelctron beam through a long undulator by Self-Amplified-Spontaneous-Emissin (SASE). About 10(13) photons per pulse can be produced in 100 fs pulses at a 120 Hz rate, corresponding to brightness levels of about 10(22) average and 10(32) peak. Peak power levels are tens of GW. Electron energies of 10-20 GeV are required. Signifcant imporvement of FEL performance seems possible using harmonic generation techniques according to results from numerical simulations.
keywords:
Details \| edit \| delete

title:	Prospects for high power linac coherent light source (LCLS) development in the 1000 angstrom-1 angstrom wavelength range
format:	conference procceeding
conference:	4th International Colloquium on X-Ray Lasers
year:	1994
26 authors:	R. Tatchyn \| K. Bane \| R. Boyce \| G. Loew \| R. Miller \| H. D. Nuhn \| D. Palmer \| J. Paterson \| T. Raubenheimer \| J. Seeman \| H. Winick \| D. Yeremian \| C. Pellegrini \| J. B. Rosenzweig \| G. Travish \| D. Prosnitz \| E. T. Scharlemann \| S. Caspi \| W. Fawley \| K. Halbach \| K. J. Kim \| R. Schlueter \| M. Xie \| R. Bonifacio \| L. De Salvo \| P. Pierini
abstract:	Electron bunch requirements for single-pass saturation of a free-electron laser (FEL) operating at full transverse coherence in the self-amplified spontaneous emission (SASE) mode include: 1) a high peak current, 2) a sufficiently low relative energy spread, and 3) a transverse emittance epsilon (r-m) satisfying the condition epsilon <= lambda /4 pi , where lambda (m) is the output wavelength of the FEL. In the insertion device that induces the coherent amplification, the prepared electron bunch must be kept on a trajectory sufficiently collinear with the amplified photons without significant dilution of its transverse density. In this paper we discuss a Linac coherent light source (LCLS) based on a high energy accelerator such as, e.g., the 3 km S-band structure at the Stanford Linear Accelerator Center (SLAC), followed by a long high-precision undulator with superimposed quadrupole (FODO) focusing, to fulfill the given requirements for SASE operation in the 1000 angstrom-1 angstrom range. The electron source for the linac, an RF gun with a laser-excited photocathode featuring a normalized emittance in the 1-3 mm-mrad range, a longitudinal bunch duration of the order of 3 ps, and approximately 10(-9) C/bunch, is a primary determinant of the required low transverse and longitudinal emittances. Acceleration of the injected bunch to energies in the 5-25 GeV range is used to reduce the relative longitudinal energy spread in the bunch, as well as to reduce the transverse emittance to values consistent with the cited wavelength regime. Two longitudinal compression stages are employed to increase the peak bunch current to the 2-5 kA levels required for sufficiently rapid saturation. The output radiation is delivered, via a grazing-incidence mirror bank, to optical instrumentation and a multi-user beam line system. Technological requirements for LCLS operation at 40 angstroms, 4.5 angstroms, and 1.5 angstroms are examined.
keywords:
Details \| edit \| delete

title:	Status Report on SPARC Project
format:	journal article
year:
96 authors:	A. Renieri \| M. Carpanese \| F. Ciocci \| G. Dattoli \| A. Di Pace \| A. Doria \| F. Flora \| G.P. Gallerano \| L. Giannessi \| E. Giovenale \| G. Messina \| L. Mezi \| P.L. Ottaviani \| S. Pagnutti \| G. Parisi \| L. Picardi \| M. Quattromini \| G. Ronci \| C. Ronsivalle \| E. Sabia \| M. Sassi \| A. Zucchini \| D. Alesini \| M. Bellaveglia \| S. Bertolucci \| M.E. Biagini \| C. Biscari \| R. Boni \| M. Boscolo \| M. Castellano \| A. Clozza \| G. Di Pirro \| A. Drago \| A. Esposito \| M. Ferrario \| D. Filippetto \| V. Fusco \| A. Gallo \| A. Ghigo \| S. Guiducci \| M. Incurvati \| C. Ligi \| F. Marcellini \| M. Migliorati \| C. Milardi \| L. Palumbo \| L. Pellegrino \| M. Preger \| P. Raimondi \| R. Ricci \| C. Sanelli \| M. Serio \| F. Sgamma \| B. Spataro \| A. Stecchi \| A. Stella \| F. Tazzioli \| C. Vaccarezza \| M. Vescovi \| C. Vicario \| M. Zobov \| F. Alessandria \| A. Bacci \| I. Boscolo \| F. Broggi \| S. Cialdi \| C. De Martinis \| D. Giove \| C. Maroli \| V. Petrillo \| M. RomË \| L. Serafini \| D. Levi \| M. Mattioli \| G. Medici \| P. Musumeci \| L. Catani \| E. Chiadroni \| S. Tazzari \| C.J. Bocchetta \| M. Danailov \| G. D'Auria \| M. Ferianis \| A. Cianchi \| A. D'Angelo \| R. Di Salvo \| A. Fantini \| D. Moricciani \| C. Schaerf \| S. Reiche \| J.B. Rosenzweig \| G. Travish \| D.H. Dowell \| P. Emma \| C. Limborg \| D. Palmer
abstract:	We review the status of FEL source activity of the ongoing SPARC FEL experiment, developed within the framework of a collaboration among ENEA, CNR, INFN, INFM, Sincrotrone Trieste and University of Rome Tor Vergata. The project is aimed at realising a SASE-FEL source, operating in the visible (around 500 nm), with an extended range of tunability down to the VUV (100 nm) by the use of the mechanism of non-linear harmonic generation. The development of the relevant activities foresees the realisation of an advanced 150 MeV photo- injector source, aimed at producing a high brightness electron beams, needed to drive a SASE-FEL experiment, and a 14 m long undulator. We present the status of the design and construction of SPARC FEL device. In particular we discuss the choice of the project parameters, their optimisation and the sensitivity of the SPARC performance to any parameter variation. We will show, using start-to-end simulations, what is the impact of the e- beam and of the undulator parameters on the characteristics of the output laser field and in particular on the amount of the non-linearly generated power at higher harmonics.
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