Fel hghg

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Tīmeklis2004. gada 1. janv. · The DUV-FEL facility has been in operation in the High Gain Harmonic Generation (HGHG) mode producing a 266-nm output from 177-MeV electrons for 1 year. In this paper, we present preliminary results of the Chirped Pulse Amplification (CPA) of the HGHG radiation. In the normal HGHG process, a 1-ps … Tīmeklis2013. gada 18. sept. · Here we report the successful generation, via two-colour, two-pulse external laser seeding of a high-gain harmonic-generation (HGHG)-based FEL, …

[1710.07801] Generation of coherent two-color pulses at the two ...

Tīmeklis2024. gada 28. maijs · A 20–65 nm highly coherent and stable FEL pulse has been achieved using the principle of single-stage HGHG in FEL1, 23 while a wavelength of 4.3 nm has been achieved using two-stage cascaded HGHG in FEL2. 66 Another unique feature of FERMI is the capability to produce an FEL with variable … Tīmeklistest the theoretical foundations of the HGHG process. By seeding an FEL at a wavelength of 10.6 mm provided by a CO 2 laser, we observed saturated amplified output at the second-harmonic wavelength, 5.3 mm(30). The HGHG pulse energy … h \u0026 r block stow ma

Two-Color Soft X-Ray Generation at the SXFEL User Facility Based …

Tīmeklisand thus limits the achievable FEL performances [9]. To overcome the above difficulty in HGHG FELs, two different schemes based on special methods for energy modulation have been proposed, which are referred to as the echo-enabled harmonic generation (EEHG) [10–12] and the phase-merging enhanced harmonic generation (PEHG) … TīmeklisThe tolerances for HGHG and SASE FEL undulators are similar for comparable photon energies. The complexity of a HGHG undulator system is, however, higher. A 200m SASE undulator consists of 40 identical 5m modules whereas a cascaded FEL can be composed of 18 modules with 9 different lengths and 5 different period lengths … TīmeklisThe HGHG FEL scheme allows eﬀective shortening of the initial seed wave- lengths by a harmonic factor typically in the range of 2 to 5. In addition, HGHG FELs can be cascaded such that the FEL radiation of one stage is usedasaseedforthenextstage. Thisallowsforsuccessiveharmonicconver- sion and enables lasing at very short … h\\u0026r block strathmore

Chirped pulse amplification of HGHG-FEL at DUV-FEL facility at BNL

APPLE Undulators for HGHG-FELs

TīmeklisIn this paper, we present the numerical simulation for HGHG operation of the Shanghai deep ultra-violet free electron laser source (SDUV-FEL). In this operation, a 264nm … Tīmeklis2024. gada 11. sept. · The intensive numerical simulations show that the cascaded EEHG-HGHG scheme can achieve 1 nm FEL pulses with peak power up to 15 GW. Further sensitivity analysis indicates that the relative timing jitter between the electron beam and seed laser has a significant impact on the FEL performance. h\u0026r block storm lake iowaTīmeklisThe FEL-1 line covers the spectral range 100–20 nm, while the FEL-2 line can reach shorter wavelengths in the range 20–4 nm, thanks to a double stage high gain harmonic generation (HGHG) setup based on the fresh bunch approach . The two lines share the electron beam delivered by the same linear accelerator complex. h\u0026r block stoughton

"TīmeklisHighGainHarmonicGenera tion(HGHG)hassuccessfully been demonstrated in Brookhaven [1] and was proposed for the BESSY Soft X-ray FEL [2]. Several … " - Fel hghg

Fel hghg

TīmeklisII. HGHG MECHANISM AND FERMI FEL In the HGHG conﬁguration the FEL process is initiated by an external laser. The process can be divided into three *[email protected] Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distri- Tīmeklis2012. gada 1. sept. · Cascading stages of high-gain harmonic generation (HGHG) free electron laser (FEL) is a promising way to produce fully coherent X-ray radiation. As …

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Tīmeklis2024. gada 23. febr. · 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 seventh harmonic … TīmeklisHGHG output at 266 nm. This would reduce the jitter by the compression ratio, which is about 4-5 times. We are in the process of building a compressor to shorten the CPA-HGHG output and a SPIDER to analyse the output in more detail. 4. Conclusion First steps toward the Chirped Pulse Amplification HGHG-FEL have been taken. …

Tīmeklis2024. gada 21. okt. · We propose a new method to generate coherent two-color pulses in a high-gain harmonic generation (HGHG) FEL. In this scheme, an initial tilted … Tīmeklis2008. gada 1. okt. · However, the early work of harmonic radiation in HGHG FEL mainly refers to the nonlinear harmonic generation, which is driven by the fundamental and …

Tīmeklisthe typical high-gain harmonic-generation (HGHG) [15] conﬁguration, the output wavelength of the FEL is deter-mined by thewavelength of the laser seed and the … Tīmeklis2024. gada 21. jūl. · Dipole chicanes can also be placed between the undulators to model various optical klystron and/or high-gain harmonic generation (HGHG) configurations. The electromagnetic field is described by a modal expansion in MINERVA. Gaussian optical modes are used for free-space propagation.

Tīmeklis2004. gada 1. janv. · The DUV-FEL facility has been in operation in the High Gain Harmonic Generation (HGHG) mode producing a 266-nm output from 177-MeV …

Tīmeklis2024. gada 27. jūn. · FELGroup,ShanghaiInstituteofAppliedPhysics,China Abstract ASASEexperimenthasbeendoneatSDUV- FEL(Shanghaideepultra-violetfreeelectronlasersource), a130∼140MeV,50A,normalizedemittance8μm.rad... hoffman watercolorTīmeklisFirst Demonstration of High-gain Harmonic Generation FEL. A high gain harmonic generation (HGHG) FEL can provide high-power radiation with a full transverse … h \u0026 r block strathmoreTīmeklis2024. gada 11. sept. · Generally, seeded FELs are ideal sources for supplying fully coherent soft x-ray pulses. Benefiting from the high-frequency up-conversion efficiency, the cascading configuration with echo-enabled harmonic generation (EEHG) and high-gain harmonic generation (HGHG) holds promising prospects for generating fully … h\u0026r block stoughton maTīmeklis2024. gada 14. dec. · We compare two fully optimized simulations of a standard HGHG and an OK-HGHG setup for the 15th harmonic of a 300 nm seed laser wavelength. (a) Gain curves in amplifier. (b) Output FEL power profiles. (c) Output FEL spectra normalized to the intensity of the standard HGHG simulation. Reuse & Permissions h\u0026r block stow maTīmeklis2016. gada 24. okt. · X-ray free-electron lasers (XFELs) provide femtosecond X-ray pulses with a narrow energy bandwidth and unprecedented brightness. Ultrafast physical and chemical dynamics, initiated with a site ... hoffman watershedTīmeklis2024. gada 27. sept. · A high-gain FEL amplifier, which typically works in the linear exponential gain regime, is the first option for generating high-peak-power radiation at various wavelengths. However, saturation occurs when electrons lose a significant amount of energy and start dephasing in the ponderomotive potential bucket. h\u0026r block strathmoreTīmeklis267.5nm. The EEHG FEL is tuned at the 30th harmonic of the seed laser. Therefore the intended two-color soft x-ray FEL radiation ia at 8.890nm and 8.917nm. The time … h\u0026r block stow ohio