Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Paul, Emma"'
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 18, Iss 9, p 090701 (2015)
Two closely spaced electron bunches have attracted strong interest due to their applications in two color X-ray free-electron lasers as well as witness bunch acceleration in plasmas and dielectric structures. In this paper, we propose a new scheme of
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 17, Iss 11, p 110703 (2014)
In this paper, a compact hard X-ray free electron lasers (FEL) design is proposed with all X-band rf acceleration and two stage bunch compression. It eliminates the need of a harmonic rf linearization section by employing optics linearization in its
Autor:
Yuantao Ding, James Lewandowski, Michael Litos, Dao Xiang, Paul Emma, Patrick Krejcik, J.W. Wang, Valery Dolgashev, Cecile Limborg, Gordon Bowden
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 17, Iss 10, p 102801 (2014)
Performance of the x-ray free electron laser Linac Coherent Light Source (LCLS) and the Facility for Advanced Accelerator Experimental Tests (FACET) is determined by the properties of their extremely short electron bunches. Multi-GeV electron bunches
Autor:
Sasha Gilevich, Joshua J. Turner, F.-J. Decker, R. H. Iverson, P. Stefan, F. Zhou, Axel Brachmann, Paul Emma
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 15, Iss 9, p 090703 (2012)
Laser-based techniques have been widely used for cleaning metal photocathodes to increase quantum efficiency (QE). However, the impact of laser cleaning on cathode uniformity and thereby on electron beam quality are less understood. We are evaluating
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 15, Iss 9, p 090701 (2012)
It is widely believed that a drive laser with uniform temporal and spatial laser profiles is required to generate the lowest emittance beam at the photoinjector. However, for a given 3 ps smooth-Gaussian laser temporal profile, our recent simulations
Autor:
Paul Emma, Yuantao Ding, H. Loos, Christopher Behrens, Patrick Krejcik, Zhirong Huang, Min-Huey Wang, Josef Frisch
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 14, Iss 12, p 120701 (2011)
Physical review accelerators and beams 14(12), 120701 (2011). doi:10.1103/PhysRevSTAB.14.120701
Physical review accelerators and beams 14(12), 120701 (2011). doi:10.1103/PhysRevSTAB.14.120701
We propose a novel method to characterize the temporal duration and shape of femtosecond x-ray pulses in a free-electron laser (FEL) by measuring the time-resolved electron-beam energy loss and energy spread induced by the FEL process, with a transve
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 13, Iss 9, p 092801 (2010)
There is growing interest in the generation and characterization of femtosecond and subfemtosecond pulses from linac-based free-electron lasers (FELs). In this report, following the method of Ricci and Smith [Phys. Rev. ST Accel. Beams 3, 032801 (200
Autor:
Josef Frisch, Daniel Ratner, Joshua J. Turner, Heinz-Dieter Nuhn, Y. Ding, David H. Dowell, Dao Xiang, Henrik Loos, Ph. Hering, Zhirong Huang, Sasha Gilevich, Paul Emma, Juhao Wu, Gennady Stupakov, R. H. Iverson, J. Welch, G. Hays, Axel Brachmann, William E. White, A. Miahnahri, F.-J. Decker
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 13, Iss 2, p 020703 (2010)
The very bright electron beam required for an x-ray free-electron laser (FEL), such as the linac coherent light source (LCLS), is susceptible to a microbunching instability in the magnetic bunch compressors, prior to the FEL undulator. The uncorrelat
Autor:
F.-J. Decker, Joshua J. Turner, Yuantao Ding, Paul Emma, David H. Dowell, R. H. Iverson, J. Welch, Gennady Stupakov, Karl Bane, Daniel Ratner, Juhao Wu, Zhirong Huang, C. Limborg-Deprey, H. Loos, Heinz-Dieter Nuhn, Josef Frisch
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 12, Iss 3, p 030704 (2009)
In order to reach the high peak current required for an x-ray free electron laser, two separate magnetic dipole chicanes are used in the Linac Coherent Light Source (LCLS) accelerator to compress the electron bunch length in stages. In these bunch co
Autor:
Paul Emma, Tor Raubenhemier
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 4, Iss 2, p 021001 (2001)
A design process is described for damping rings in a linear collider where the competing requirements of small equilibrium emittance and fast damping of the injected phase space are needed. A systematic approach to the determination of the basic ring