An X-ray Free Electron Laser Driven by an Ultimate Storage Ring

Cai, Yunhai; Ding, Yuantao; Hettel, R.; Huang, Zhirong; Wang, Lanfa; Xiao, Liling

doi:10.1080/08940886.2013.791216

Cited by 16 publications

(11 citation statements)

References 5 publications

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“…A recent proposal for a storage-ring based freeelectron laser makes use of flat beams ðε y ≪ ε x Þ with ultralow vertical emittance, based on a gradient vertical insertion device [45,46]. For such a proposal, it may be beneficial to consider the angular distribution of stimulated undulator radiation at undulator harmonics greater than the fundamental.…”

Section: Discussionmentioning

confidence: 99%

Measurement of ultralow vertical emittance using a calibrated vertical undulator

Wootton

Boland

Rassool

2014

Phys. Rev. ST Accel. Beams

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Very few experimental techniques are useful for the direct observation of ultralow vertical emittance in electron storage rings. In this work, quantitative measurements of ultralow (pm rad) electron beam vertical emittance using a vertical undulator are presented. An undulator radiation model was developed using the measured magnetic field of the APPLE-II type undulator. Using calibrated experimental apparatus, a geometric vertical emittance of ε y ¼ 0.9 AE 0.3 pm rad has been observed. These measurements could also inform modeling of the angular distribution of undulator radiation at high harmonics, for proposed diffraction-limited storage ring light sources.

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Section: Discussionmentioning

confidence: 99%

Measurement of ultralow vertical emittance using a calibrated vertical undulator

Wootton

Boland

Rassool

2014

Phys. Rev. ST Accel. Beams

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“…Since the 1980s synchrotron light sources have been considered for driving a high gain self-amplified spontaneous emission (SASE) FEL [7,8] in a by-pass line [9][10][11][12][13][14][15][16] or in the ring itself [17], in order to approach RRs of up to 100 kHz without a superconducting linac investment, and taking advantage of existing or planned synchrotron light sources. At present, synchrotron light sources target emittances compatible with lasing at (sub-)nm wavelength [18,19], whereas FELs require emittances at the diffraction limit, 4πε x λ [20].…”

Section: Background and Outlookmentioning

confidence: 99%

“…Transverse gradient undulators (TGUs) [21,22], traversed by an energy-dispersed beam, promise to compensate for the mismatch of large beam energy spread and FEL energy bandwidth [23,24]. A single bunch peak current of up to ∼250 A [15,16] could then generate significant FEL peak power in a practical undulator length. Unfortunately, the bunch peak current in a multi-bunch filling pattern is of the order of only a few tens of…”

Section: Background and Outlookmentioning

confidence: 99%

Operating synchrotron light sources with a high gain free electron laser

Mitri

Cornacchia

2015

New J. Phys.

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Since the 1980s synchrotron light sources have been considered as drivers of a high repetition rate (RR), high gain free electron laser (FEL) inserted in a by-pass line or in the ring itself. As of today, the high peak current required by the laser is not deemed to be compatible with the standard multi-bunch filling pattern of synchrotrons, and in particular with the operation of insertion device (ID) beamlines. We show that this problem can be overcome by virtue of magnetic bunch length compression in a ring section, and that, after lasing, the beam returns to equilibrium conditions without beam quality disruption. Bunch length compression brings a double advantage: the high peak current stimulates a high gain FEL emission, while the large energy spread makes the beam less sensitive to the FEL heating and to the microwave instability in the ring. The beam's large energy spread at the undulator is matched to the FEL energy bandwidth through a transverse gradient undulator. Feasibility of lasing at 25 nm is shown for the Elettra synchrotron light source at 1 GeV, and scaling to shorter wavelengths as a function of momentum compaction, beam energy and transverse emittance in higher energy, larger rings is discussed. For the Elettra case study, a low (100 Hz) and a high (463 kHz) FEL RR are considered, corresponding to an average FEL output power at the level of ∼1 W (∼10 13 photons per pulse) and ∼300 W (∼10 11 photons per pulse), respectively. We also find that, as a by-product of compression, the ∼5 W Renieri's limit on the average FEL power can be overcome. Our conclusion is that existing and planned synchrotron light sources may be made compatible with this new hybrid IDs-plus-FEL operational mode, with little impact on the standard beamlines functionality. Background and outlookFree electron lasers (FELs) in the ultra-violet (UV) and x-rays driven by high brightness radiofrequency linear accelerators (RF linacs) [1, 2] have become complementary to synchrotron light sources for the investigation of matter, from molecular to atomic scale. Despite their high peak brilliance and degree of coherence, high gain FELs are surpassed by synchrotrons in number of pulses per second and in number of beamlines that can be served simultaneously. A high repetition rate (RR) of the FEL is a prerequisite for multi-beamline operation; with present technology, it requires a superconducting linac [3-5] and a complex fan-like set of transfer lines [6].Since the 1980s synchrotron light sources have been considered for driving a high gain self-amplified spontaneous emission (SASE) FEL [7,8] in a by-pass line [9][10][11][12][13][14][15][16] or in the ring itself [17], in order to approach RRs of up to 100 kHz without a superconducting linac investment, and taking advantage of existing or planned synchrotron light sources. At present, synchrotron light sources target emittances compatible with lasing at (sub-)nm wavelength [18,19], whereas FELs require emittances at the diffraction limit, 4πε x  λ [20]. Transverse gradient u...

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“…Since TGU could be used as the energy spread compensator, in the diffraction-limited storage rings, straight TGU radiator by-pass line could be used to generate FELs with high rep-rate [7,8]. Moreover, we can take the advantage of the rather larger acceptance of TGU to increase the rep-rate by slowly damping.…”

mentioning

confidence: 99%

Numerical Investigations of Transverse Gradient Undulator Based on Novel Light Sources

Zhang¹,

Wang²,

Yao³

et al. 2014

JMEA

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Abstract:With the stat-of-the-art laser technique, the quality of electron beam generated from LPA (laser-plasma accelerator) is now becoming much better. The natural merits of electron beam from LPA, e.g., high peak current, ultra-low emittance and ultra-short bunch length, etc., pave the way to the novel light sources, especially in the realm of developing much more compact x-ray light sources, e.g., table-top XFEL (x-ray free-electron laser). However, the radiation power is limited by the rather larger energy spread than conventional radio-frequency electron LINAC (linear accelerator). Luckily, much more power could be extracted by using the undulator with transverse gradient when energy spread effect could be compensated. In this paper, we introduce a novel soft x-ray light source driven by LPA together with TGU (transverse gradient undulator) technique, meanwhile we present a simple idea on how to achieve much higher rep-rate (e.g., ~100 kHz) FELs (free-electron lasers) boosted by TGU based on storage rings.

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An X-ray Free Electron Laser Driven by an Ultimate Storage Ring

Cited by 16 publications

References 5 publications

Measurement of ultralow vertical emittance using a calibrated vertical undulator

Measurement of ultralow vertical emittance using a calibrated vertical undulator

Operating synchrotron light sources with a high gain free electron laser

Numerical Investigations of Transverse Gradient Undulator Based on Novel Light Sources

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