Zobrazeno 1 - 10
of 1 262
pro vyhledávání: '"D. Ratner"'
Autor:
Adi Hanuka, X. Huang, J. Shtalenkova, D. Kennedy, A. Edelen, Z. Zhang, V. R. Lalchand, D. Ratner, J. Duris
Publikováno v:
Physical Review Accelerators and Beams, Vol 24, Iss 7, p 072802 (2021)
High-dimensional optimization is a critical challenge for operating large-scale scientific facilities. We apply a physics-informed Gaussian process (GP) optimizer to tune a complex system. Typical GP models learn from past observations to make predic
Externí odkaz:
https://doaj.org/article/5dc4526ca31c47d595ee0b91ac9fd6c6
Publikováno v:
Physical Review Accelerators and Beams, Vol 23, Iss 4, p 040701 (2020)
The free-electron laser process extracts energy from a relativistic electron beam to create high-power, coherent x-ray radiation. The energy loss leaves an imprint of the radiation on the longitudinal energy-time phase-space of the electron beam. At
Externí odkaz:
https://doaj.org/article/c6e703e94eca4d78aed759f1ae0aad6e
Publikováno v:
Physical Review Accelerators and Beams, Vol 23, Iss 2, p 022803 (2020)
Measuring the quantum efficiency (QE) map of a photocathode injector typically requires laser scanning, an invasive operation that involves modifying the injector laser focus and rastering the focused laser spot across the photocathode surface. Raste
Externí odkaz:
https://doaj.org/article/6df9e4f629ea4519a1b9c6aab456098c
Autor:
E. Hemsing, G. Marcus, W. M. Fawley, R. W. Schoenlein, R. Coffee, G. Dakovski, J. Hastings, Z. Huang, D. Ratner, T. Raubenheimer, G. Penn
Publikováno v:
Physical Review Accelerators and Beams, Vol 22, Iss 11, p 110701 (2019)
We present the results from studies of soft x-ray seeding options for the LCLS–II x-ray free electron laser (FEL) at SLAC. The LCLS-II will use superconducting accelerator technology to produce x-ray pulses at up to 1 MHz repetition rate using 4 Ge
Externí odkaz:
https://doaj.org/article/1cd63962046e4e1f93a84d4ccdaf5640
Publikováno v:
Physical Review X, Vol 9, Iss 1, p 011045 (2019)
In this paper, we propose a new approach to measuring ultrafast dynamics with free-electron lasers (FELs). Ultrafast experiments are among the most promising avenues of research at x-ray FELs, with the potential to reveal the chemical dynamics of cha
Externí odkaz:
https://doaj.org/article/a61247bc2d9244dc8fd77ed6297ef0dd
Autor:
R.B. Mailliard, J. Kristoff, J.M. Zerbato, N.D. Sluis-Cremer, P. Gupta, C.R. Rinaldo, D. Ratner, M. Ding
Publikováno v:
Journal of Virus Eradication, Vol 1, Iss , Pp 17- (2015)
Externí odkaz:
https://doaj.org/article/de1436465248468bbd1153247daab7d6
Autor:
S. Li, S. Alverson, D. Bohler, A. Egger, A. Fry, S. Gilevich, Z. Huang, A. Miahnahri, D. Ratner, J. Robinson, F. Zhou
Publikováno v:
Physical Review Accelerators and Beams, Vol 20, Iss 8, p 080704 (2017)
The photocathode rf gun is one of the most critical components in x-ray free electron lasers. The drive laser strikes the photocathode surface, which emits electrons with properties that depend on the shape of the drive laser. Most free electron lase
Externí odkaz:
https://doaj.org/article/90c24226c4a342ea849d6c1d827d3897
Publikováno v:
Physical Review Accelerators and Beams, Vol 20, Iss 5, p 054402 (2017)
The shot-noise driven microbunching instability can significantly degrade electron beam quality in x-ray free electron laser light sources. Experiments were carried out at the Linac Coherent Light Source (LCLS) to study this instability. In this pape
Externí odkaz:
https://doaj.org/article/d0ba21e11d024ae880f319bcb0c1e1f5
Autor:
Y. Ding, K. L. F. Bane, W. Colocho, F.-J. Decker, P. Emma, J. Frisch, M. W. Guetg, Z. Huang, R. Iverson, J. Krzywinski, H. Loos, A. Lutman, T. J. Maxwell, H.-D. Nuhn, D. Ratner, J. Turner, J. Welch, F. Zhou
Publikováno v:
Physical Review Accelerators and Beams, Vol 19, Iss 10, p 100703 (2016)
A new operating mode has been developed for the Linac Coherent Light Source (LCLS) in which we shape the longitudinal phase space of the electron beam. This mode of operation is realized using a horizontal collimator located in the middle of the firs
Externí odkaz:
https://doaj.org/article/25768a29005844e09c5a072847839735
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 18, Iss 5, p 050703 (2015)
The phenomenon of Dicke’s subradiance, in which the collective properties of a system suppress radiation, has received broad interest in atomic physics. Recent theoretical papers in the field of relativistic electron beams have proposed schemes to
Externí odkaz:
https://doaj.org/article/a973c254fb4a489eb15b003ea24dec7b