Start-up noise in 3-D self-amplified spontaneous emission

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The Self-Amplified-Spontaneous Emission (SASE) is receiving a renewed interest recently in connection with the proposal to build x-ray FEL facilities. A consistent theory of how the initial incoherent undulator radiation develops into an exponentially growing coherent signal was derived in 1-D case previously. How the theory could be extended to a 3-D case was also explained previously. In the case of the parallel electron beam, the problem was explicitly solved previously. In particular, the equivalent noise power was identified as the undulator radiation in one gain length. In this paper, we study how the result should be modified when the ... continued below

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11 p.

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Kim, Kwang-Je August 1, 1996.

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Description

The Self-Amplified-Spontaneous Emission (SASE) is receiving a renewed interest recently in connection with the proposal to build x-ray FEL facilities. A consistent theory of how the initial incoherent undulator radiation develops into an exponentially growing coherent signal was derived in 1-D case previously. How the theory could be extended to a 3-D case was also explained previously. In the case of the parallel electron beam, the problem was explicitly solved previously. In particular, the equivalent noise power was identified as the undulator radiation in one gain length. In this paper, we study how the result should be modified when the electrons` angular divergence is taken into account. We find that the equivalent noise power is the portion of the undulator power within the coherent phase space area, a result that should have been expected.

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11 p.

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OSTI as DE97000971

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  • 18. international free electron laser conference and 3. FEL Users` workshop, Rome (Italy), 25-30 Aug 1996

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  • Other: DE97000971
  • Report No.: LBNL--38813
  • Report No.: CBP-Note--180;CONF-9608133--8
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 412246
  • Archival Resource Key: ark:/67531/metadc687230

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Office of Scientific & Technical Information Technical Reports

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  • August 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • April 5, 2016, 1:47 p.m.

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Kim, Kwang-Je. Start-up noise in 3-D self-amplified spontaneous emission, article, August 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc687230/: accessed August 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.