Self modulation hghg

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August undefined, 2024

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 WebAn electron beam with a laser-induced energy modulation as small as 1.8 times the slice energy spread is used for lasing at the seventh harmonic of a 266-nm seed laser in a single-stage high-gain harmonic generation (HGHG) setup and the 30th harmonic of the seed laser in a two-stage HGHG setup.

Self-Amplification of Coherent Energy Modulation in Seeded Free ...

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 … WebSep 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. handrail height canada

Self-Amplification of Coherent Energy Modulation in …

WebSep 23, 2024 · A fixed speed system allows relative humidity to go as high as 60 percent while modulating systems do not break 50 percent. Mold is harmful to the physical … 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 … business cards salisbury md

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

Features and futures of X-ray free-electron lasers - ScienceDirect

WebMay 13, 2012 · Lasing in X-ray free-electron lasers is typically achieved by self-amplification of spontaneous emission, which is known to have non-ideal temporal coherence and suffer from beam fluctuations ... WebA 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 … handrail height code coloradoWebDec 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 business cards rush delivery

"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% … " - Self modulation hghg

Self modulation hghg

High-repetition-rate seeded free-electron laser with direct ...

WebA 795 MeV electron beam with a laser-induced energy modulation amplitude as small as 1.8 times the slice energy spread is used for lasing at the 7 th harmonic of a 266-nm seed laser in a single-stage high-gain harmonic generation (HGHG) and the 30 th harmonic of the seed laser in a two-stage HGHG. 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

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WebApr 23, 2014 · The initially proposed PEHG consists of a dogleg followed by a HGHG configuration with a TGU modulator, as shown in figure 1.Rectangular coordinates are given in scheme 1, where x and y represent the horizontal and vertical directions, respectively. The dogleg with dispersion is used to transversely disperse the electron beam, while the TGU …

Webhigh-gainharmonicgeneration(HGHG)[12,13] technique, sinusoidal energy modulation in beam longitudinal phase space is first produced through a laser-electron interaction in a short undulator (modulator). After passing through a small chicane, the energy modulation is converted into density modulation that has a frequency component at the WebJun 5, 2024 · self-modulation scheme is systematically analyzed and optimized, and further experiments in which the self-modulator is resonant at the second harmonic of the seed laser are conducted. The three-dimensional numerical simulations show that the required seed laser intensity in the self-modulation scheme is around

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. 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.

WebNov 2, 2024 · An electron beam with a laser-induced energy modulation as small as 1.8 times the slice energy spread is used for lasing at the 7th harmonic of a 266-nm seed …

WebThe self-modulation scheme together with the electron-beam longitudinal phase spaces at various positions. Credit: SARI ... (HGHG) and the 30th harmonic of the seed laser in a two-stage HGHG. business cards roseville caWebQuiet start scheme is broadly utilized in Self Amplified Spontaneous Radiation (SASE) FEL simulations, which is proven to be correct and efficient. Nevertheless, due 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. business cards salem oregonWebMar 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 ]. handrail height code georgia