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J. Smedley

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Last Name: Smedley

Full Name: J. Smedley

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2 papers

title: Proposed continuous wave energy recovery operation of an x-ray free electron laser

format: journal article

year: 2005

17 authors: J. Sekutowicz | S.A. Bogacz | D. Douglas | P. Kneisel | G.P. Williams | M. Ferrario | I. Ben-Zvi | J. Rose | J. Smedley | T. Srinivasan-Rao | L. Serafini | W.D. Moller | B. .Petersen | D. Proch | S. Simrock | P. Colestock | J. B. Rosenzweig

abstract: Commissioning of two large coherent light facilities (XFELs) at SLAC and DESY should begin in 2008 and 2011, respectively. In this paper we look further into the future, hoping to answer, in a very preliminary way, two questions. First: What will the next generation of XFEL facilities look like? Believing that superconducting technology offers advantages such as high quality beams with highly populated bunches, the possibility of energy recovery and higher overall efficiency than warm technology, we focus this preliminary study on the superconducting option. From this belief the second question arises: What modifications in superconducting technology and in the machine design are needed, as compared to the present DESY XFEL, and what kind of research and development program should be proposed to arrive in the next few years at a technically feasible solution with even higher brilliance and increased overall conversion of ac power to photon beam power? In this paper we will very often refer to and profit from the DESY XFEL design, acknowledging its many technically innovative solutions.

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title: Nb-Pb Superconducting RF-Gun

format: journal article

year: 2006

18 authors: J. Sekutowicz | J. Iversen | G. Kreps | W.-D. Möller | W. Singer | X. Singer | I. Ben-Zvi | A. Burrill | J. Smedley | T. Rao | M. Ferrario | P. Kneisel | J. Langner | R. Lefferts | A. Lipski | K. Szałowski | K. Ko | L. Xiao

abstract: We report on the status of an electron RF-gun made of two superconductors: niobium and lead. The presented design combines the advantages of the RF performance of bulk niobium superconducting cavities and the reasonably high quantum efficiency of lead, as compared to other superconducting metals. The concept, mentioned in a previous paper, follows the attractive approach of all niobium superconducting RF-gun as it has been proposed by the BNL group. Measured values of quantum efficiency for lead at various photon energies, analysis of recombination time of photon-broken Copreliminary cold test results are discussed in this paper.

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title:	Proposed continuous wave energy recovery operation of an x-ray free electron laser
format:	journal article
year:	2005
17 authors:	J. Sekutowicz \| S.A. Bogacz \| D. Douglas \| P. Kneisel \| G.P. Williams \| M. Ferrario \| I. Ben-Zvi \| J. Rose \| J. Smedley \| T. Srinivasan-Rao \| L. Serafini \| W.D. Moller \| B. .Petersen \| D. Proch \| S. Simrock \| P. Colestock \| J. B. Rosenzweig
abstract:	Commissioning of two large coherent light facilities (XFELs) at SLAC and DESY should begin in 2008 and 2011, respectively. In this paper we look further into the future, hoping to answer, in a very preliminary way, two questions. First: What will the next generation of XFEL facilities look like? Believing that superconducting technology offers advantages such as high quality beams with highly populated bunches, the possibility of energy recovery and higher overall efficiency than warm technology, we focus this preliminary study on the superconducting option. From this belief the second question arises: What modifications in superconducting technology and in the machine design are needed, as compared to the present DESY XFEL, and what kind of research and development program should be proposed to arrive in the next few years at a technically feasible solution with even higher brilliance and increased overall conversion of ac power to photon beam power? In this paper we will very often refer to and profit from the DESY XFEL design, acknowledging its many technically innovative solutions.
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title:	Nb-Pb Superconducting RF-Gun
format:	journal article
year:	2006
18 authors:	J. Sekutowicz \| J. Iversen \| G. Kreps \| W.-D. Möller \| W. Singer \| X. Singer \| I. Ben-Zvi \| A. Burrill \| J. Smedley \| T. Rao \| M. Ferrario \| P. Kneisel \| J. Langner \| R. Lefferts \| A. Lipski \| K. Szałowski \| K. Ko \| L. Xiao
abstract:	We report on the status of an electron RF-gun made of two superconductors: niobium and lead. The presented design combines the advantages of the RF performance of bulk niobium superconducting cavities and the reasonably high quantum efficiency of lead, as compared to other superconducting metals. The concept, mentioned in a previous paper, follows the attractive approach of all niobium superconducting RF-gun as it has been proposed by the BNL group. Measured values of quantum efficiency for lead at various photon energies, analysis of recombination time of photon-broken Copreliminary cold test results are discussed in this paper.
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