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J. G. Power

First Name: J

Middle Name: G

Last Name: Power

Full Name: J. G. Power

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2 papers

title: Observation of plasma wakefield acceleration in the underdense regime

format: unknown

year: 2000

5 authors: N. Barov | J. B. Rosenzweig | M. E. Conde | W. Gai | J. G. Power

abstract: Initial experiments which have explored the physics of the underdense (blowout) regime of the plasma wakefield accelerator (PWFA) at the Argonne Wakefield Accelerator facility are reported. In this regime, the relativistic electron beam is denser than the plasma, causing the beam channel to completely rarefy, and leaving a high quality accelerating region which also contains a uniform ion column. This ion column in turn allows the drive and accelerating beams to be well guided over many initial beam beta-function lengths. The results of these experiments, which have taken place over several years, are reviewed. Notable achievements in the course of these studies include the creation and measurement of drive and witness beam generated in an rf photoinjector, as well as previously published studies on drive beam guiding in the underdense regime. In addition, these experiments allowed measurement of both beam energy loss and gain, at a maximum average rate of 25 MeV/m in this regime of the PWFA, which is consistent with a peak acceleration gradient of 62 MeV/m in the excited waves. Difficulties associated with this type of experiment are discussed, as are prospects for mitigating these difficulties and achieving high gradient acceleration in planned future experiments.

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title: The operation of the BNL/ATF GUN-IV photocathode RF gun at the Advanced Photon Source

format: conference procceeding

conference: 1999 Particle Accelerator Conference

year: 1999

18 authors: S. G. Biedron | G. A. Goeppner | J. W. Lewellen | S. V. Milton | A. Nassiri | G. Travish | X. J. Wang | N. D. Arnold | W. J. Berg | M. Babzien | C. L. Doose | R. J. Dortwegt | A. Grelick | J. N. Galayda | G. M. Markovich | S. J. Pasky | J. G. Power | B. X. Yang

abstract: At the Advanced Photon Source (APS) at Argonne National Laboratory (ANL), a free-electron laser (FEL) based on the self-amplified spontaneous emission (SASE) process is nearing completion. Recently, an RF photoinjector gun system was made available to the APS by Brookhaven National Laboratory/Accelerator Test Facility (BNL/ATF). It will be used to provide the high-brightness, low-emittance, and low-energy spread electron beam required by the SASE FEL theory. A Nd:Glass laser system, capable of producing a maximum of 500 mu J of UV in a 1-10 ps pulse at up to a 10-Hz repetition rate, serves as the photoinjector's drive laser. Here, the design, commissioning, and integration of this gun with the APS are discussed. (8 References).

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title:	Observation of plasma wakefield acceleration in the underdense regime
format:	unknown
year:	2000
5 authors:	N. Barov \| J. B. Rosenzweig \| M. E. Conde \| W. Gai \| J. G. Power
abstract:	Initial experiments which have explored the physics of the underdense (blowout) regime of the plasma wakefield accelerator (PWFA) at the Argonne Wakefield Accelerator facility are reported. In this regime, the relativistic electron beam is denser than the plasma, causing the beam channel to completely rarefy, and leaving a high quality accelerating region which also contains a uniform ion column. This ion column in turn allows the drive and accelerating beams to be well guided over many initial beam beta-function lengths. The results of these experiments, which have taken place over several years, are reviewed. Notable achievements in the course of these studies include the creation and measurement of drive and witness beam generated in an rf photoinjector, as well as previously published studies on drive beam guiding in the underdense regime. In addition, these experiments allowed measurement of both beam energy loss and gain, at a maximum average rate of 25 MeV/m in this regime of the PWFA, which is consistent with a peak acceleration gradient of 62 MeV/m in the excited waves. Difficulties associated with this type of experiment are discussed, as are prospects for mitigating these difficulties and achieving high gradient acceleration in planned future experiments.
keywords:
Download \| View \| Details \| edit \| delete

title:	The operation of the BNL/ATF GUN-IV photocathode RF gun at the Advanced Photon Source
format:	conference procceeding
conference:	1999 Particle Accelerator Conference
year:	1999
18 authors:	S. G. Biedron \| G. A. Goeppner \| J. W. Lewellen \| S. V. Milton \| A. Nassiri \| G. Travish \| X. J. Wang \| N. D. Arnold \| W. J. Berg \| M. Babzien \| C. L. Doose \| R. J. Dortwegt \| A. Grelick \| J. N. Galayda \| G. M. Markovich \| S. J. Pasky \| J. G. Power \| B. X. Yang
abstract:	At the Advanced Photon Source (APS) at Argonne National Laboratory (ANL), a free-electron laser (FEL) based on the self-amplified spontaneous emission (SASE) process is nearing completion. Recently, an RF photoinjector gun system was made available to the APS by Brookhaven National Laboratory/Accelerator Test Facility (BNL/ATF). It will be used to provide the high-brightness, low-emittance, and low-energy spread electron beam required by the SASE FEL theory. A Nd:Glass laser system, capable of producing a maximum of 500 mu J of UV in a 1-10 ps pulse at up to a 10-Hz repetition rate, serves as the photoinjector's drive laser. Here, the design, commissioning, and integration of this gun with the APS are discussed. (8 References).
keywords:
Download \| View \| Details \| edit \| delete

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