Wakefields studies for the SXFEL user facility

Song, Minghao; Feng, Chao; Huang, Dazhang; Deng, Haixiao; Liu, Bo; Wang, Dong

doi:10.1007/s41365-017-0242-7

Cited by 27 publications

(28 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A multi-phase transport (AMPT) model [17][18][19] demonstrated initial geometry fluctuations of partons created in Au + Au collisions and its effects on elliptic and triangular flow. Initial fluctuation effects have been also proposed on some observables or physics quantities, such as on collective obeservabels [20][21][22][23], conserved quantities [24], density fluctuations [25], and chiral effects [26,27] etc.…”

Section: Introductionmentioning

confidence: 99%

“…To understand these observables in experiments and QGP phase transition, there are also some open questions for small collision systems (such as C + C or O + O collisions) as well as large collision systems (such as Au + Au or Pb + Pb collisions), (1) how to understand transformation coefficient from initial geometry distribution or fluctuation to momentum distribution at final stage in hydrodynamical mechanism [20,[28][29][30]; (2) how to understand similar phenomena for some observables for small systems with high multiplicity and large systems [9,10,[31][32][33][34][35][36][37]; (3) does the matter created in different size of system undergo the similar dy-namical process and have similar viscosity [38,39]?, and the last two questions are closely related. Recently the small system experiments were proposed for RHIC-STAR [40] and LHC-ALICE [41] to study the initial geometry distribution and fluctuations effects on momentum distribution at final stage.…”

Section: Introductionmentioning

confidence: 99%

“…r 4 E 2 2 , and ε 4,22 = ǫ 4 2 . From hydrodynamics viewpoint, the relationship between initial geometry eccentricity coefficients and flow coefficients can be described by v n ∝ ε n , (n = 2, and 3) [20,28,29]. The response of v n to ε n showed the efficiency of the transformation from initial geometry properties to final momentum space in heavy-ion collisions.…”

Section: A Brief Introduction To Ampt and Algorithmmentioning

confidence: 99%

See 2 more Smart Citations

Collision system size scan of collective flows in relativistic heavy-ion collisions

Zhang

et al. 2020

Physics Letters B

View full text Add to dashboard Cite

Initial geometrical distribution and fluctuation can affect the collective expansion in relativistic heavy-ion collisions. This effect may be more evident in small system (such as B + B) than in large one (Pb + Pb). This work presents the collision system dependence of collective flows and discusses about effects on collective flows from initial fluctuations in a framework of a multiphase transport model. The results shed light on system scan on experimental efforts to small system physics.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: A Brief Introduction To Ampt and Algorithmmentioning

confidence: 99%

See 1 more Smart Citation

Collision system size scan of collective flows in relativistic heavy-ion collisions

Zhang

et al. 2020

Physics Letters B

View full text Add to dashboard Cite

show abstract

mentioning

confidence: 99%

Soft X-Ray Second Harmonic Generation as an Interfacial Probe

Lam¹,

Raj²,

Pascal³

et al. 2018

Phys. Rev. Lett.

View full text Add to dashboard Cite

“…This enables a powerful new approach for surface and interface analysis with broad applicability to many scientific fields, as it combines the elemental and chemical specificity of x-ray absorption spectroscopy with the rigorous interfacial specificity of second-order nonlinear spectroscopies, while maintaining a fully coherent signal. With several new coherent free electron lasers under development (SwissFEL, SXFEL, LCLS-II, FLASH2020) [15,16], this new technique offers exciting applications to a wide range of problems.At optical wavelengths, second-order nonlinear spectroscopies have become indispensable techniques for surface PHYSICAL REVIEW LETTERS 120, 023901 (2018) Editors' Suggestion Featured in Physics 0031-9007=18=120(2)=023901(6) 023901-1 …”

mentioning

confidence: 99%

X-Ray Probe Targets Interfaces

Nilsson

2018

Physics

View full text Add to dashboard Cite

Nonlinear optical processes at soft x-ray wavelengths have remained largely unexplored due to the lack of available light sources with the requisite intensity and coherence. Here we report the observation of soft x-ray second harmonic generation near the carbon K edge (∼284 eV) in graphite thin films generated by high intensity, coherent soft x-ray pulses at the FERMI free electron laser. Our experimental results and accompanying first-principles theoretical analysis highlight the effect of resonant enhancement above the carbon K edge and show the technique to be interfacially sensitive in a centrosymmetric sample with second harmonic intensity arising primarily from the first atomic layer at the open surface. This technique and the associated theoretical framework demonstrate the ability to selectively probe interfaces, including those that are buried, with elemental specificity, providing a new tool for a range of scientific problems. DOI: 10.1103/PhysRevLett.120.023901 Nonlinear optics has recently been extended from visible and near UV wavelengths to new regimes with the development of x-ray free electron lasers (XFELs) capable of delivering x-ray pulses with high brightness, ultrashort pulse duration, and high coherence [1][2][3][4][5][6][7]. One fundamental nonlinear probe is second harmonic generation (SHG), a secondorder process which combines two photons of the same energy to generate a single photon with twice the energy [8]. At infrared, visible, and ultraviolet wavelengths, secondorder nonlinear spectroscopies have become important tools in surface science, as symmetry considerations within the dipole approximation constrain signal generation to regions lacking centrosymmetry, such as surfaces and interfaces [9][10][11][12]. In contrast, at hard x-ray wavelengths, second harmonic and sum frequency generation (SFG) have been observed in centrosymmetric materials with a nonuniform electron density and are essentially bulk probes [1,2]. As soft x-ray wavelengths fall in between the hard x-ray and UV regimes, there has been uncertainty regarding the interface specificity of soft x-ray SHG. Here, by utilizing a recently constructed, highly coherent, soft x-ray free electron laser [13,14], we report the first observation of soft x-ray second harmonic generation near the carbon K edge (∼284 eV). Our experimental results and accompanying theoretical analysis indicate that soft x-ray SHG is an interface-specific probe with symmetry constraints similar to optical SHG or SFG, and is highly sensitive to resonance effects. This enables a powerful new approach for surface and interface analysis with broad applicability to many scientific fields, as it combines the elemental and chemical specificity of x-ray absorption spectroscopy with the rigorous interfacial specificity of second-order nonlinear spectroscopies, while maintaining a fully coherent signal. With several new coherent free electron lasers under development (SwissFEL, SXFEL, LCLS-II, FLASH2020) [15,16], this new technique offers exciting application...

show abstract

Wakefields studies for the SXFEL user facility

Cited by 27 publications

References 23 publications

Collision system size scan of collective flows in relativistic heavy-ion collisions

Collision system size scan of collective flows in relativistic heavy-ion collisions

Soft X-Ray Second Harmonic Generation as an Interfacial Probe

X-Ray Probe Targets Interfaces

Contact Info

Product

Resources

About