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Self modulation hghg

WebDec 11, 2013 · The recent success of self-amplified spontaneous emission (SASE)-based x-ray free-electron laser (FEL) facilities [1, 2] is enabling cutting-edge science in various areas. ... usually needed to strengthen the energy modulation in HGHG, which will result in a degradation of the amplification process in the radiator. Thus the requirement of FEL WebA similar layout can be found in the scheme of self-modulation HGHG [ 31], where the first stage of the HGHG radiator is resonant at the fundamental or the second harmonic wavelength. Our work can be distinguished by the high-order harmonic modulator and the significant bunching factor up to the 20th harmonic of the seed laser wavelength.

Theory of high gain harmonic generation: an analytical estimate

WebThe proposed self-seeding system as described in Ref. [38]. Another approach to produce temporal coherent light, proposed in [39, 40], also falls under the category of a self-seeding FEL although it actually uses two electron bunches. A schematic of this approach is shown in Fig .2. Fig. 2. (color online) Schematic of the two-bunch self-seeding WebQuiet start scheme is broadly utilized in Self Amplified Spontaneous Radiation (SASE) FEL simulations, which is proven to be correct and efficient. Nevertheless, d ue to the energy modulation and the dispersion section, the High Gain Harmonic Generation (HGHG) FEL simulation will not be improved by the traditional quiet start method. A meijer 2155 paul jones way lexington https://luney.net

(PDF) Harmonic-enhanced high-gain harmonic generation for a hig…

WebFor the self seeded scheme both the undulators have a 2.8 cm period, while in the HGHG case the period is 4.2cm for the modulator and 2.8cm for the radiator. The self seeded scheme operates at 6 nm while for the HGHG we assume a 30 nm seed with 5th harmonic conversion. Results in the ideal case: self seeding Webin storage rings. Self modulation or optical-klystron HGHG is based on pre-density modulation method. These schemes still need a laser-induced energy modulation at least … Webthe HGHG scheme is made of 3 sections of 55 periods each and the first undulator for the self seeded scheme is made of 7 sections of 75 periods. With this setup we obtain an 8% … nantwich swimming pool opening times

Theory of high gain harmonic generation: an analytical estimate

Category:Quiet Start Method in small signal HGHG FEL Simulation

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Self modulation hghg

Review of fully coherent free-electron lasers SpringerLink

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Self modulation hghg

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Webhigh-gainharmonicgeneration(HGHG)[12,13] technique, sinusoidal energy modulation in beam longitudinal phase space is first produced through a laser-electron interaction in a … WebJul 10, 2024 · In the high-gain harmonic generation (HGHG) scheme , an external seed laser pulse is used to interact with the electrons in a short undulator, called modulator, to imprint a sinusoidal energy modulation on the electron beam at the optical wavelength scale. This energy modulation then develops into an associated density modulation after passing ...

WebMar 11, 2024 · The self-modulation scheme together with the electron-beam longitudinal phase spaces at various positions. Credit: SARI Seeded free-electron lasers (FELs), which … WebMay 1, 2002 · Analytical estimate of HGHG The HGHG process can be separated into four distinct steps: the modulator, the dispersion section, the coherent harmonic generation in the first two gain lengths of the radiator, and the exponential growth section.

WebMay 28, 2024 · The HGHG scheme comprises three sections. The first part, known as the modulator (an undulator with large λ u ), involves a seed laser interacting with the electron beam to impose a small energy modulation. WebMar 14, 2024 · In HGHG, the energy modulation required to produce significant bunching at the n th harmonic is roughly n times the initial e-beam energy spread. For high n, this strong energy modulation severely deteriorates the FEL gain and limits the scheme to nmax ~15 (to wavelengths around 15–20 nm) [ 23 ].

WebThese fulfill the requirements of the aforementioned scientific applications. In HGHG FELs [15], a sinusoidal energy modulation is first introduced to the electrons via the …

Webpli ed energy modulation, various seeded FEL schemes can be combined following the self-modulator. As pre-sented in Fig. 1, a second chicane and a radiator after the self-modulator, used to achieve a large bunching factor and lasing at high harmonics, make it a typical HGHG layout. A proof-of-principle experiment was conducted at the meijer 16th st holland pharmacyWebHowever, single-stage HGHG suffers from noise during the high-energy modulation, requires high laser power (expen- sive and degrading to the FEL), and is limited to around 20nm [6]. Multiple-stage HGHG can reach shorter wave- lengths, but is … meijer 2501 s creyts rd lansing minantwich swimming pool car parkWebA recently proposed concept of the Echo-Enabled Harmonic Generation (EEHG) FEL uses two laser modulators in combination with two dispersion sections to generate a high-harmonic density modulation in a relativistic beam. This seeding technique holds promise of a one-stage soft x-ray FEL that radiates not only transversely but also longitudinally … meijer 23 mile rd chesterfield pharmacyWebSep 11, 2024 · The SASE and self-seeding operation modes are both adopted in FEL-I and FEL-III for generating hard x-ray FEL pulses. To meet the demands of users, FEL-II is designed as a soft x-ray beamline utilizing SASE and external seeding schemes. The cascaded EEHG-HGHG scheme is one of the promising candidates for FEL-II. meijer 23 and gratiot pharmacyWebIn HGHG FELs[15], a sinusoidal energy modulation is first introduced to the electrons via the interaction between the electronbeamandanexternalseedlaserwithinamodulation … meijer 23 gratiot pharmacyWebAug 11, 2000 · In the HGHG FEL, a small energy modulation is imposed on the electron beam by interaction with a seed laser in a short undulator (the modulator). The energy … nantwich swimming pool telephone number