Harmonic generation with multiple wiggler schemes

Bonifacio, R.; Salvo, Luc; Pierini, P.

doi:10.2172/88778

Cited by 36 publications

(84 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…If we define the contrast C as the ratio of number of photons in the main spike to the total number of photons in the pulse, we find that C asymptotically approaches unity as the ratio E th / E (8) increases, where E th is the threshold level of the 8th harmonic energy pulse discriminator. Clearly, the larger the threshold level of discriminator E th / E (8) , the larger the number of shots per trigger pulse N sh . Note that the number of degrees of freedom M of the fundamental radiation pulse is a parameter of the functions…”

Section: Statistical Properties Of Sase Fel High-harmonic Radiationmentioning

confidence: 96%

“…Each stage (except the first one) consists of radiator undulator, dispersion section (demodulator), FEL amplifier and end-stage dispersion section (modulator). The main difference with previous HGHG schemes [6][7][8][9][10][11][12][13][14] is that frequency multiplication is performed with a single electron bunch consecutively passing all HGHG stages. This is possible because the density modulation exiting each stage is relatively small.…”

Section: Introductionmentioning

confidence: 99%

“…Signals from a non-destructive 8th harmonic energy pulse detector are used to give trigger. The energy threshold is used to reject events with E smaller than 2 E (8) peak power of the 1st harmonic (a.u) t Fig. 3.…”

Section: Introductionmentioning

confidence: 99%

“…The energy in the high-harmonic radiation pulse must be measured by means of a non-destructive method. After each shot, the signal from the energy detector is sent to a discriminator having a threshold E th ≃ 2 E (8) , where E (8) is the mean energy of the 8th harmonic (averaged over the ensemble of pulses) After discrimination signal is used to give a trigger. A register is used to store information concerning the trigger and sample detector events.…”

Section: Introductionmentioning

confidence: 99%

“…How likely are we to observe a practically single bright spike in the intensity of the 8th harmonic radiation? Clearly, a necessary condition for this event is that the energy E (8) in the 8th-harmonic radiation pulse is larger than the average energy E (8) . The results of numerical simulations for the case of the 8th-harmonic of the X-ray SASE FEL predict the probability of high-contrast single-spike pulses of about 1-10% only.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Scheme for Attophysics experiments at a X-ray SASE FEL

Saldin

Schneidmiller

Yurkov

2003

Free Electron Lasers 2002

View full text Add to dashboard Cite

We propose a concept for production of high power coherent attosecond pulses in X-ray range. An approach is based on generation of 8th harmonic of radiation in a multistage HGHG FEL (high gain high harmonic free electron laser) configuration starting from shot noise. Single-spike phenomena occurs when electron bunch is passed through the sequence of four relatively short undulators. The first stage is a conventional "long" wavelength (0.8 nm) SASE FEL which operates in the high-gain linear regime. The 0.1 nm wavelength range is reached by successive multiplication (0.8 nm → 0.4 nm → 0.2 nm → 0.1 nm) in a stage sequence. Our study shows that the statistical properties of the high-harmonic radiation from the SASE FEL, operating in linear regime, can be used for selection of radiation pulses with a single spike in time domain. The duration of the spikes is in attosecond range. Selection of single-spike high-harmonic pulses is achieved by using a special trigger in data acquisition system. The potential of X-ray SASE FEL at TESLA at DESY for generating attosecond pulses is demonstrated. Since the design of XFEL laboratory at TESLA is based on the use of long SASE undulators with tunable gap, no special place nor additional FEL undulators are required for attophysics experiments. The use of a 10 GW-level attosecond X-ray pulses at X-ray SASE FEL facility will enable us to track processes inside atoms.

show abstract

Section: Statistical Properties Of Sase Fel High-harmonic Radiationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Scheme for Attophysics experiments at a X-ray SASE FEL

Saldin

Schneidmiller

Yurkov

2003

Free Electron Lasers 2002

View full text Add to dashboard Cite

show abstract

Creating and Probing Long‐range Order in Atomic Clouds

Cube

Slama

Kohler

et al. 2007

Elements of Quantum Information

View full text Add to dashboard Cite

Ultracold atoms interacting with the optical modes of a high-Q optical ring cavity can synchronize their motion. The collective behavior makes the system interesting for quantum computing applications. This paper is devoted to the study of the collective coupling. We report on the first observation of a collective dynamics and on the realization of a laser, the gain mechanism of which is based on collective atomic recoil. We show that, if the atoms are subject to a friction force, starting from an unordered distribution they spontaneously form a moving density grating. Furthermore, we demonstrate that a 1D atomic density grating can be probed via Bragg scattering. By heterodyning the Bragg-reflected light with a reference beam, we obtain detailed information on phase shifts induced by the Bragg scattering process.

show abstract

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Zhukovsky

2021

Annalen der Physik

View full text Add to dashboard Cite

A theoretical analysis of the radiation in X-ray free electron lasers (FELs) LCLS, PAL-XFEL, SwissFEL, as well as SACLA, FLASH 2, and European XFEL is presented. Major losses in FELs are analytically accounted for and analyzed, using exact expressions for the Bessel factors in terms of the generalized Bessel functions. This allows distinguishing the contributions of key parameters and accounting for the losses individually for each harmonic, considering higher sensitivity of the electron-photon interaction at higher harmonic wavelengths. The harmonic power evolution along FELs and the spectral width of the radiation lines is studied. The theoretical results are analyzed and are compared with the available experimental data for the FEL experiments. The harmonic generation and amplification in the FELs are modeled and studied with the harmonic lasing self-seed (HLSS) with separate buncher and radiator, and the results are compared with those for SASE. The spectral properties of the radiation are analytically calculated and compared with the measured spectral characteristics. The advantages of HLSS versus SASE FEL are elucidated in the examples of FLASH2, European XFEL, and SwissFEL. The prospected radiation properties of LCLS-II FEL are analyzed and the possibilities of using harmonics in this FEL are proposed.

show abstract

Harmonic generation with multiple wiggler schemes

Cited by 36 publications

References 0 publications

Scheme for Attophysics experiments at a X-ray SASE FEL

Scheme for Attophysics experiments at a X-ray SASE FEL

Creating and Probing Long‐range Order in Atomic Clouds

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Contact Info

Product

Resources

About