LCLS X-RAY pulse duration measurement using the statistical fluctuation method

J. Wu; Y. Ding; P. Emma; Z. Huang; H. Loos; M. Messerschmidt; E. Schneidmiller; M. Yurkov

LCLS X-RAY pulse duration measurement using the statistical fluctuation method

J. Wu, Y. Ding, P. Emma, Z. Huang, H. Loos, M. Messerschmidt, E. Schneidmiller, M. Yurkov

Research output: Contribution to conference › Paper › peer-review

Abstract

For a Self-Amplified Spontaneous Emission (SASE) Free-Electron Laser (FEL), the FEL pulse energy fluctuates from shot to shot, because the lasing process starts up from shot noise. When operating in the exponential growth regime, the radiation exhibits the properties of completely chaotic polarized light. Hence, the probability distribution of the FEL pulse energy follows a Gamma-distribution. Measuring such a distribution function, one can calculate the average number of "degrees of freedom" or "modes" in the radiation pulse. Measuring the FEL power gain length, one can extract the temporal duration of a single coherent spike, therefore, one can calculate the FEL pulse temporal duration. In this paper, we report experimental results at LCLS. Measurements are conducted for both nominal charge (250 pC) and low charge (40 pC and 20 pC) cases.

Original language	English (US)
Pages	147-150
Number of pages	4
State	Published - Dec 1 2010
Externally published	Yes
Event	32nd International Free Electron Laser Conference, FEL 2010 - Malmo City, Sweden Duration: Aug 23 2010 → Aug 27 2010

Other

Other	32nd International Free Electron Laser Conference, FEL 2010
Country/Territory	Sweden
City	Malmo City
Period	8/23/10 → 8/27/10

ASJC Scopus subject areas

Nuclear and High Energy Physics

Cite this

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title = "LCLS X-RAY pulse duration measurement using the statistical fluctuation method",

abstract = "For a Self-Amplified Spontaneous Emission (SASE) Free-Electron Laser (FEL), the FEL pulse energy fluctuates from shot to shot, because the lasing process starts up from shot noise. When operating in the exponential growth regime, the radiation exhibits the properties of completely chaotic polarized light. Hence, the probability distribution of the FEL pulse energy follows a Gamma-distribution. Measuring such a distribution function, one can calculate the average number of {"}degrees of freedom{"} or {"}modes{"} in the radiation pulse. Measuring the FEL power gain length, one can extract the temporal duration of a single coherent spike, therefore, one can calculate the FEL pulse temporal duration. In this paper, we report experimental results at LCLS. Measurements are conducted for both nominal charge (250 pC) and low charge (40 pC and 20 pC) cases.",

author = "J. Wu and Y. Ding and P. Emma and Z. Huang and H. Loos and M. Messerschmidt and E. Schneidmiller and M. Yurkov",

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TY - CONF

T1 - LCLS X-RAY pulse duration measurement using the statistical fluctuation method

AU - Wu, J.

AU - Ding, Y.

AU - Emma, P.

AU - Huang, Z.

AU - Loos, H.

AU - Messerschmidt, M.

AU - Schneidmiller, E.

AU - Yurkov, M.

PY - 2010/12/1

Y1 - 2010/12/1

N2 - For a Self-Amplified Spontaneous Emission (SASE) Free-Electron Laser (FEL), the FEL pulse energy fluctuates from shot to shot, because the lasing process starts up from shot noise. When operating in the exponential growth regime, the radiation exhibits the properties of completely chaotic polarized light. Hence, the probability distribution of the FEL pulse energy follows a Gamma-distribution. Measuring such a distribution function, one can calculate the average number of "degrees of freedom" or "modes" in the radiation pulse. Measuring the FEL power gain length, one can extract the temporal duration of a single coherent spike, therefore, one can calculate the FEL pulse temporal duration. In this paper, we report experimental results at LCLS. Measurements are conducted for both nominal charge (250 pC) and low charge (40 pC and 20 pC) cases.

AB - For a Self-Amplified Spontaneous Emission (SASE) Free-Electron Laser (FEL), the FEL pulse energy fluctuates from shot to shot, because the lasing process starts up from shot noise. When operating in the exponential growth regime, the radiation exhibits the properties of completely chaotic polarized light. Hence, the probability distribution of the FEL pulse energy follows a Gamma-distribution. Measuring such a distribution function, one can calculate the average number of "degrees of freedom" or "modes" in the radiation pulse. Measuring the FEL power gain length, one can extract the temporal duration of a single coherent spike, therefore, one can calculate the FEL pulse temporal duration. In this paper, we report experimental results at LCLS. Measurements are conducted for both nominal charge (250 pC) and low charge (40 pC and 20 pC) cases.

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T2 - 32nd International Free Electron Laser Conference, FEL 2010

Y2 - 23 August 2010 through 27 August 2010

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LCLS X-RAY pulse duration measurement using the statistical fluctuation method

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ASJC Scopus subject areas

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