Femtosecond X-ray spectroscopy of haem proteins

Bacellar, Camila; Kinschel, Dominik; Cannelli, Oliviero; Sorokin, Boris V.; Katayama, Tetsuo; Mancini, Giulia F.; Rouxel, Jérémy R.; Nishitani, Junichi; Ito, Hironori; Ito, Tomoyoshi; Kurahashi, Naoya; Higashimura, Chika; Kudo, Shotaro; Cirelli, Claudio; Knopp, G.; Nass, Karol; Johnson, Philip J. M.; Wach, Anna; Szlachetko, Jakub; Lima, Frederico A.; Milne, Christopher J.; Yabashi, Makina; Suzuki, Toshinori; Misawa, Kazuhiko; Chergui, Majed

doi:10.1039/d0fd00131g

Cited by 4 publications

(9 citation statements)

References 77 publications

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“…In the case of a BCM equipped with a single detector integrating the radiation emitted by the electron beam in a given acceptance frequency band ∆ω = (ω max − ω min ), the formal results described by eqs. (10,11) permit to express the relative variation of the BCM signal ∆I I with respect to a reference value -for instance, the mean value of the BCM signal readouts over a sequential acquisition of machine bunch shots -as a function of the corresponding relative variations of the bunch charge ∆N N and of the electron bunch length ∆σ σ . In eq.…”

Section: Bunch Length Relative Variation From a Single Detector Bcmmentioning

confidence: 99%

“…Provided that the reference BCM signal has been calibrated in advance by means of an absolute measurement of the electron bunch length σ -for instance, by means of a Transverse Deflecting Structure (TDS) [36][37][38][39][40] -eqs. (10,11) permits a shot-to-shot tracking of the relative variation of the bunch length ∆σ σ as a function of the relative fluctuations of the BCM and charge monitor signals: ∆I I and ∆N N . In the case of the SwissFEL BC1-BCM with an acceptance frequency band of 0.3 − 2.0 THz, the capability of the eqs.…”

Section: Bunch Length Relative Variation From a Single Detector Bcmmentioning

confidence: 99%

“…In the case of the SwissFEL BC1-BCM with an acceptance frequency band of 0.3 − 2.0 THz, the capability of the eqs. (10,11) to predict ∆σ σ was numerically tested for a Gaussian FF with σ = 270 fs, see fig. (1).…”

Section: Bunch Length Relative Variation From a Single Detector Bcmmentioning

confidence: 99%

“…The lasing performance of a linac driven Free Electron Laser (FEL) strongly relies on the stability over time of the low emittance and high density current features that the electron beam can achieve after the different acceleration and compression stages operated in the machine [1][2][3][4][5][6][7][8][9][10][11][12]. At every compression stage, the non-invasive and shot-sequential monitoring of the electron bunch length in a FEL can be ensured by Bunch Compressor Monitors (BCMs) [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Absolute and non-invasive determination of the electron bunch length in a Free Electron Laser using a Bunch Compressor Monitor

Orlandi

2023

Preprint

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In a linac driven Free Electron Laser (FEL), the shot-to-shot and non-invasive monitoring of the electron bunch length is normally ensured by Bunch Compressor Monitors (BCMs). The bunch-length dependent signal of a BCM results from the detection and integration - over a given frequency band - of the temporal coherent enhancement of the radiation spectral energy emitted by the electron beam while experiencing a longitudinal compression. In this work, we present a method that permits to express the relative variation of the bunch length as a function of the relative statistical fluctuations of the BCM and charge signals. Furthermore, in the case of a BCM equipped with two detectors simultaneously operating in two distinct wavelength bands, the method permits an absolute determination of the electron bunch length. The proposed method is beneficial to a FEL since it permits to tune the machine compression feedback with respect to the absolute measurement of the bunch length instead of a bunch-length dependent signal. In a CW-superconducting-linac driven FEL, it can offer the precious opportunity to implement a fully non-invasive and absolute diagnostics of the bunch length.

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Section: Bunch Length Relative Variation From a Single Detector Bcmmentioning

confidence: 99%

Section: Bunch Length Relative Variation From a Single Detector Bcmmentioning

confidence: 99%

Section: Bunch Length Relative Variation From a Single Detector Bcmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Absolute and non-invasive determination of the electron bunch length in a Free Electron Laser using a Bunch Compressor Monitor

Orlandi

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The lasing performance of a linac driven Free Electron Laser (FEL) strongly relies on the stability over time of the low emittance and high density current features that the electron beam can achieve after the different acceleration and compression stages operated in the machine [1][2][3][4][5][6][7][8][9][10][11][12]. At every compression stage, the non-invasive and shot sequential monitoring of the electron bunch length in a FEL can be ensured by Bunch Compressor Monitors (BCMs) [13][14][15][16][17][18].…”

mentioning

confidence: 99%

Bunch length and energy measurements in the bunch compressor of a free-electron laser

Orlandi

Xue

Brands

et al. 2019

Phys. Rev. Accel. Beams

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At SwissFEL, a fully non-invasive characterization of the beam energy distribution can be performed by means of a Synchrotron-Radiation-Monitor (SRM) imaging in the visible the transverse profile of the electron beam in a magnetic chicane. Under conditions of off-crest acceleration in the SwissFEL injector, according to a first order Taylor series expansion, the distribution of the relative energy of the electron beam can be linearly expressed as a function of the distribution of the electron longitudinal coordinates via the coefficient of the rf induced beam energy chirp. It is hence possible to express the distribution of the electron longitudinal coordinates at the entrance of the magnetic chicane of SwissFEL as a function of the distribution of the dispersed electron trajectories in the horizontal plane of the magnetic chicane. Machine parameters and instrument data at SwissFEL can be beam-synchronously acquired. A shot-by-shot correlation between the analysis results of the SRM camera images and the linear coefficient of the beam energy chirp resulting from the rf parameters of the injector can be hence established. Finally, taking into account the compression factor of the magnetic chicane, the electron bunch length at the exit of the magnetic chicane can be expressed as a function of the horizontal size of the electron beam imaged by the SRM. Bunch-length measurements performed by means of the SRM in the first magnetic chicane of SwissFEL will be presented.

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Absolute and non-invasive determination of the electron bunch length in a free electron laser using a bunch compressor monitor

Orlandi

2024

Sci Rep

View full text Add to dashboard Cite

In a linac driven Free Electron Laser (FEL), the shot-to-shot and non-invasive monitoring of the electron bunch length is normally ensured by Bunch Compressor Monitors (BCMs). The bunch-length dependent signal of a BCM results from the detection and integration—over a given frequency band—of the temporal coherent enhancement of the radiation spectral energy emitted by the electron beam while experiencing a longitudinal compression. In this work, we present a method that permits to express the relative variation of the bunch length as a function of the relative statistical fluctuations of the BCM and charge signals. Furthermore, in the case of a BCM equipped with two detectors simultaneously operating in two distinct wavelength bands, the method permits an absolute determination of the electron bunch length. The proposed method is beneficial to a FEL. Thanks to it, the machine compression feedback can be tuned against the absolute measurement of the bunch length rather than a bunch-length dependent signal. In a CW-superconducting-linac driven FEL, it can offer the precious opportunity to implement a fully non-invasive and absolute diagnostics of the bunch length.

show abstract

Femtosecond X-ray spectroscopy of haem proteins

Abstract: We discuss our recently reported femtosecond (fs) X-ray emission spectroscopy results on the ligand dissociation and recombination in Nitrosylmyoglobin (MbNO) in the context of previous studies on ferrous haem proteins....

Cited by 4 publications

References 77 publications

Absolute and non-invasive determination of the electron bunch length in a Free Electron Laser using a Bunch Compressor Monitor

Absolute and non-invasive determination of the electron bunch length in a Free Electron Laser using a Bunch Compressor Monitor

Bunch length and energy measurements in the bunch compressor of a free-electron laser

Absolute and non-invasive determination of the electron bunch length in a free electron laser using a bunch compressor monitor

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