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F. Hartemann

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4 papers

title: Production of High Harmonic X-ray Radiation from Non-linear Thomson Scattering at LLNL PLEIADES

format: conference procceeding

conference: 2005 Particle Accelerator Conference

year: 2005

11 authors: J. Lim | A. Doyuran | P. Frigola | G. Travish | J. B. Rosenzweig | S. Anderson | S. Betts | J. Crane | D. Gibson | F. Hartemann | A. Tremaine

abstract: We describe an experiment for production of high harmonic x-ray radiation from Thomson backscattering of an ultra-short high power density laser by a relativistic electron beam at the PLEIADES facility at LLNL. In this scenario, electrons execute a ``figure-8'' motion under the influence of the high-intensity laser field, where the constant characterizing the field strength is expected to exceed unity: $a_{L}=eE_{L}/m_{e}c\omega_{L}\geq1$. With large $a_{L}$ this motion produces high harmonic x-ray radiation and significant broadening of the spectral peaks. This paper is intended to give a layout of the PLEIADES experiment, along with progress towards experimental goals.

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title: Ultrafast materials probing with the LLNL Thomson X-ray source

format: conference procceeding

conference: 2002 Linear Accelerator Conference

year: 2002

24 authors: A. Tremaine | S. Anderson | W. Brown | C. Barty | R. Cauble | J. Crane | H. Cynn | C. Ebbers | D. Fittinghoff | D. Gibson | F. Hartemann | I. Jovanovich | J. Kuba | G. P. Le Sage | A. McMahan | R. Minich | J. Moriarty | B. Remington | D. Slaughter | P. Springer | F. H. Steitz | C. S. Yoo | J. B. Rosenzweig | T. Ditmire

abstract: The use of short laser pulses to generate very high brightness, ultra short (fs to ps) x-ray pulses is a topic of great interest. In principle, femtosecond-scale pump-probe experiments can be used to temporally resolve structural dynamics of materials on the time scale of atomic motion. The development of sub?ps x-ray pulses will make possible a wide range of materials and plasma physics studies with unprecedented time resolution. PLEIADES (Picosecond Laser Electron Interaction for Dynamic Evaluation of Structures), the Thomson scattering project at LLNL, will provide such a novel x-ray source of high power using short laser pulses and a high brightness, relativistic electron bunch. The system is based on a 5 mm-mrad normalized emittance photoinjector, 100 MeV electron RF linac, and a 300 mJ, 35 fs solid-state laser system. PLEIADES will produce ultra fast pulses with x-ray energies (60 keV) capable of probing into high-Z metals.

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title: A permanent-magnet focused X-band photoinjector

format: conference procceeding

conference: 1999 Particle Accelerator Conference

year: 1999

8 authors: Yu, D. | Newsham, D. | Wilson, P. | Zeng, J. | J. B. Rosenzweig | X. Ding | F. Hartemann | Landahl, E.

abstract: A Plane-Wave-Transformer (PWT), integrated photoinjector operating at an X-band frequency (8.547GHz) is being developed by DULY Research Inc. in a DOE SBIR project, in collaboration with UCLA and UCD/ILSA. Upward frequency scaling from an S-band PWT photoinjector would result in a compact photoinjector with unprecedented brightness. Challenging technological innovations are required at X-band. In particular, water cooling capacity, mechanical support strength, and materials properties do not scale linearly with frequency. Instead of using large solenoids, we have successfully designed the required focusing for an X-band PWT using a compact, permanent magnet system. Also described in this paper is a system design of the X-band photoinjector, including the RF system and the cooling/support of the PWT structure.

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title: A millimeter wave FEL driven by a photocathode RF linac

format: conference procceeding

conference: 15th International Free Electron Laser Conference

year: 1994

11 authors: Zhang, R. | C. Pellegrini | J. B. Rosenzweig | G. LeSage | F. Hartemann | D. McDermott | C. Joshi | N. Luhmann | P. Pierini | de Salvo, L. | Bonifacio, R.

abstract: We present the design of a millimeter wave FEL based on the UCLA photocathode RF linac. The linac energy can be varied between 5 and 18 MeV. The electron pulse duration is 2 ps FWHM, with a peak current exceeding 150 A. The FEL is designed to operate in the high-gain Compton regime, controlling the slippage with the propagating radiation in a waveguide. The design permits the exploration of the basic FEL physics in this regime, including the exploration of saturation and lethargy in the superradiant and steady state regime. (15 References).

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title:	Production of High Harmonic X-ray Radiation from Non-linear Thomson Scattering at LLNL PLEIADES
format:	conference procceeding
conference:	2005 Particle Accelerator Conference
year:	2005
11 authors:	J. Lim \| A. Doyuran \| P. Frigola \| G. Travish \| J. B. Rosenzweig \| S. Anderson \| S. Betts \| J. Crane \| D. Gibson \| F. Hartemann \| A. Tremaine
abstract:	We describe an experiment for production of high harmonic x-ray radiation from Thomson backscattering of an ultra-short high power density laser by a relativistic electron beam at the PLEIADES facility at LLNL. In this scenario, electrons execute a ``figure-8'' motion under the influence of the high-intensity laser field, where the constant characterizing the field strength is expected to exceed unity: $a_{L}=eE_{L}/m_{e}c\omega_{L}\geq1$. With large $a_{L}$ this motion produces high harmonic x-ray radiation and significant broadening of the spectral peaks. This paper is intended to give a layout of the PLEIADES experiment, along with progress towards experimental goals.
keywords:
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title:	Ultrafast materials probing with the LLNL Thomson X-ray source
format:	conference procceeding
conference:	2002 Linear Accelerator Conference
year:	2002
24 authors:	A. Tremaine \| S. Anderson \| W. Brown \| C. Barty \| R. Cauble \| J. Crane \| H. Cynn \| C. Ebbers \| D. Fittinghoff \| D. Gibson \| F. Hartemann \| I. Jovanovich \| J. Kuba \| G. P. Le Sage \| A. McMahan \| R. Minich \| J. Moriarty \| B. Remington \| D. Slaughter \| P. Springer \| F. H. Steitz \| C. S. Yoo \| J. B. Rosenzweig \| T. Ditmire
abstract:	The use of short laser pulses to generate very high brightness, ultra short (fs to ps) x-ray pulses is a topic of great interest. In principle, femtosecond-scale pump-probe experiments can be used to temporally resolve structural dynamics of materials on the time scale of atomic motion. The development of sub?ps x-ray pulses will make possible a wide range of materials and plasma physics studies with unprecedented time resolution. PLEIADES (Picosecond Laser Electron Interaction for Dynamic Evaluation of Structures), the Thomson scattering project at LLNL, will provide such a novel x-ray source of high power using short laser pulses and a high brightness, relativistic electron bunch. The system is based on a 5 mm-mrad normalized emittance photoinjector, 100 MeV electron RF linac, and a 300 mJ, 35 fs solid-state laser system. PLEIADES will produce ultra fast pulses with x-ray energies (60 keV) capable of probing into high-Z metals.
keywords:
Download \| View \| Details \| edit \| delete

title:	A permanent-magnet focused X-band photoinjector
format:	conference procceeding
conference:	1999 Particle Accelerator Conference
year:	1999
8 authors:	Yu, D. \| Newsham, D. \| Wilson, P. \| Zeng, J. \| J. B. Rosenzweig \| X. Ding \| F. Hartemann \| Landahl, E.
abstract:	A Plane-Wave-Transformer (PWT), integrated photoinjector operating at an X-band frequency (8.547GHz) is being developed by DULY Research Inc. in a DOE SBIR project, in collaboration with UCLA and UCD/ILSA. Upward frequency scaling from an S-band PWT photoinjector would result in a compact photoinjector with unprecedented brightness. Challenging technological innovations are required at X-band. In particular, water cooling capacity, mechanical support strength, and materials properties do not scale linearly with frequency. Instead of using large solenoids, we have successfully designed the required focusing for an X-band PWT using a compact, permanent magnet system. Also described in this paper is a system design of the X-band photoinjector, including the RF system and the cooling/support of the PWT structure.
keywords:
Download \| View \| Details \| edit \| delete

title:	A millimeter wave FEL driven by a photocathode RF linac
format:	conference procceeding
conference:	15th International Free Electron Laser Conference
year:	1994
11 authors:	Zhang, R. \| C. Pellegrini \| J. B. Rosenzweig \| G. LeSage \| F. Hartemann \| D. McDermott \| C. Joshi \| N. Luhmann \| P. Pierini \| de Salvo, L. \| Bonifacio, R.
abstract:	We present the design of a millimeter wave FEL based on the UCLA photocathode RF linac. The linac energy can be varied between 5 and 18 MeV. The electron pulse duration is 2 ps FWHM, with a peak current exceeding 150 A. The FEL is designed to operate in the high-gain Compton regime, controlling the slippage with the propagating radiation in a waveguide. The design permits the exploration of the basic FEL physics in this regime, including the exploration of saturation and lethargy in the superradiant and steady state regime. (15 References).
keywords:
Download \| View \| Details \| edit \| delete

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