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M.J. Hogan

First Name: M.

Middle Name: J.

Last Name: Hogan

Full Name: M.J. Hogan

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3 papers

title: Breakdown Limits on Gigavolt-per-Meter Electron-Beam-Driven Wakefields in Dielectric Structures

format: journal article

year: May 27, 2008

15 authors: M.C. Thompson | H. Badakov | A.M. Cook | J.B. Rosenzweig | R. Tikhoplav | G. Travish | I. Blumenfeld | M.J. Hogan | R. Ischebeck | N. Kirby | R. Siemann | D. Walz | P. Muggli | A. Scott | R.B. Yoder

abstract: First measurements of the breakdown threshold in a dielectric subjected to GV=m wakefields produced by short (30 – 330 fs), 28.5 GeV electron bunches have been made. Fused silica tubes of 100

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title: Dielectric Wakefield Accelerator Experiments at the Saber Facility

format: conference procceeding

conference: PAC07

year: 2007

17 authors: G. Travish | H. Badakov | A. Cook | J.B. Rosenzweig | R. Tikhoplav | A. Kanareykin | M.C. Thompson | M.K. Berry | I. Blumenfeld | F.J. Decker | M.J. Hogan | R. Ischebeck | R. Iverson | N. Kirby | R. Siemann | D. Walz | P. Muggli

abstract: Electron bunches with the unparalleled combination of high charge, low emittances, and short time duration, as first produced at the SLAC Final Focus Test Beam (FFTB), are foreseen to be produced at the SABER facility. These types of bunches have enabled wakefield driven accelerating schemes of multi-GV/m in plasmas. In the context of the Dielectric Wakefield Accelerators (DWA) such beams, having rms bunch length as short as 20 um, have been used to drive 100 um and 200 um ID hollow tubes above 20 GV/m surface fields. These FFTB tests enabled the measurement of a breakdown threshold in fused silica (with full data analysis still ongoing) [1]. With the construction and commissioning of the SABER facility at SLAC, new experiments would be made possible to test further aspects of DWAs including materials, tube geometrical variations, direct measurements of the Cerenkov fields, and proof of acceleration in tubes >10 cm in length. This collaboration will investigate breakdown thresholds and accelerating fields in new materials including CVD diamond. Here we describe the experimental plans, beam parameters, simulations, and progress to date as well as future prospects for machines based of DWA structures.

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title: Observation of Multi-GeV Breakdown Thresholds in Dielectric Wakefield Structures

format: conference procceeding

conference: PAC07

year: 2007

12 authors: M.C. Thompson | H. Badakov | J.B. Rosenzweig | G. Travish | M.J. Hogan | R. Ischebeck | N. Kirby | R. Siemann | D. Walz | P. Muggli | A. Scott | R. Yoder

abstract: An experiment designed to test the breakdown threshold of a dielectric subjected to the GV/m-scale electric-fields of an intense electron-beam has been completed. In this experiment at the Final Focus Test Beam (FFTB) facility, the 28.5 GeV SLAC electron beam was focused down and propagated through short fused-silica capillary-tubes with internal diameters of as little as 100 μm. The electric field at the inner surface of the tubes was varied from about 1 GV/m to 22 GV/m by adjusting the longitudinal compres- sion of the electron bunch. We observed a sharp increase in optical emissions from the capillaries in the middle part of this surface field range which we believe indicates the transition between sustainable field levels and breakdown. If this initial interpretation is correct, the multi-GV/m sur- faced fields that were sustained equate to on axis accelerat- ing field of several GV/m.

keywords: pbpl_pub

Download | View | Details | edit | delete

title:	Breakdown Limits on Gigavolt-per-Meter Electron-Beam-Driven Wakefields in Dielectric Structures
format:	journal article
year:	May 27, 2008
15 authors:	M.C. Thompson \| H. Badakov \| A.M. Cook \| J.B. Rosenzweig \| R. Tikhoplav \| G. Travish \| I. Blumenfeld \| M.J. Hogan \| R. Ischebeck \| N. Kirby \| R. Siemann \| D. Walz \| P. Muggli \| A. Scott \| R.B. Yoder
abstract:	First measurements of the breakdown threshold in a dielectric subjected to GV=m wakefields produced by short (30 – 330 fs), 28.5 GeV electron bunches have been made. Fused silica tubes of 100
keywords:
Download \| View \| Details \| edit \| delete

title:	Dielectric Wakefield Accelerator Experiments at the Saber Facility
format:	conference procceeding
conference:	PAC07
year:	2007
17 authors:	G. Travish \| H. Badakov \| A. Cook \| J.B. Rosenzweig \| R. Tikhoplav \| A. Kanareykin \| M.C. Thompson \| M.K. Berry \| I. Blumenfeld \| F.J. Decker \| M.J. Hogan \| R. Ischebeck \| R. Iverson \| N. Kirby \| R. Siemann \| D. Walz \| P. Muggli
abstract:	Electron bunches with the unparalleled combination of high charge, low emittances, and short time duration, as first produced at the SLAC Final Focus Test Beam (FFTB), are foreseen to be produced at the SABER facility. These types of bunches have enabled wakefield driven accelerating schemes of multi-GV/m in plasmas. In the context of the Dielectric Wakefield Accelerators (DWA) such beams, having rms bunch length as short as 20 um, have been used to drive 100 um and 200 um ID hollow tubes above 20 GV/m surface fields. These FFTB tests enabled the measurement of a breakdown threshold in fused silica (with full data analysis still ongoing) [1]. With the construction and commissioning of the SABER facility at SLAC, new experiments would be made possible to test further aspects of DWAs including materials, tube geometrical variations, direct measurements of the Cerenkov fields, and proof of acceleration in tubes >10 cm in length. This collaboration will investigate breakdown thresholds and accelerating fields in new materials including CVD diamond. Here we describe the experimental plans, beam parameters, simulations, and progress to date as well as future prospects for machines based of DWA structures.
keywords:	pbpl_pub
Download \| View \| Details \| edit \| delete

title:	Observation of Multi-GeV Breakdown Thresholds in Dielectric Wakefield Structures
format:	conference procceeding
conference:	PAC07
year:	2007
12 authors:	M.C. Thompson \| H. Badakov \| J.B. Rosenzweig \| G. Travish \| M.J. Hogan \| R. Ischebeck \| N. Kirby \| R. Siemann \| D. Walz \| P. Muggli \| A. Scott \| R. Yoder
abstract:	An experiment designed to test the breakdown threshold of a dielectric subjected to the GV/m-scale electric-fields of an intense electron-beam has been completed. In this experiment at the Final Focus Test Beam (FFTB) facility, the 28.5 GeV SLAC electron beam was focused down and propagated through short fused-silica capillary-tubes with internal diameters of as little as 100 μm. The electric field at the inner surface of the tubes was varied from about 1 GV/m to 22 GV/m by adjusting the longitudinal compres- sion of the electron bunch. We observed a sharp increase in optical emissions from the capillaries in the middle part of this surface field range which we believe indicates the transition between sustainable field levels and breakdown. If this initial interpretation is correct, the multi-GV/m sur- faced fields that were sustained equate to on axis accelerat- ing field of several GV/m.
keywords:	pbpl_pub
Download \| View \| Details \| edit \| delete

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