Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Dowell, David H."'
Field emitted electrons can seriously affect the operation of high-field, high-duty factor electron accelerators. Accelerated field emission can result in high average power beams which can radiation damage beamline components. In addition, localized
Externí odkaz:
http://arxiv.org/abs/2212.07993
Autor:
Dowell, David H.
Publikováno v:
Phys. Rev. Accel. Beams 22, 084201 (2019)
The space charge limit (SCL) of emission from photocathodes sets an upper limit on the performance of both high- and low-field electron guns. Generally, one is forced to strike a compromise between the space charge limit and the cathode's intrinsic e
Externí odkaz:
http://arxiv.org/abs/1811.01996
Autor:
Dowell, David H.
This paper discusses the emittance growth produced by sextupole fields in conjunction with a solenoidal focusing. The sextupole emittance is derived and compared with numerical simulations using a measured sextupole field for a vacuum chamber in a so
Externí odkaz:
http://arxiv.org/abs/1810.00086
Publikováno v:
Phys. Rev. Accel. Beams 21, 010101 (2018)
Small, stray magnetic and RF fields in electron guns and injectors can perturb an electron beam and introduce correlations between the otherwise orthogonal transverse trajectories. These correlations couple the x and y dynamics which increases the tr
Externí odkaz:
http://arxiv.org/abs/1707.07015
Autor:
Dowell, David H.
Advances in electron beam technology have been central to creating the current generation of x-ray free electron lasers and ultra-fast electron microscopes. These once exotic devices have become essential tools for basic research and applied science.
Externí odkaz:
http://arxiv.org/abs/1610.01242
Autor:
Dowell, David H.
It is well-known that the electron beam quality required for applications such as FELs and ultra-fast electron diffraction can be degraded by the asymmetric fields introduced by the RF couplers of superconducting linacs. This effect is especially tro
Externí odkaz:
http://arxiv.org/abs/1503.09142
Autor:
Dowell, David H., Jongewaard, Erik, Lewandowski, James, Limborg-Deprey, Cecile, Li, Zenghai, Schmerge, John, Vlieks, Arnold, Wang, Juwen, Xiao, Liling
The Linac Coherent Light Source (LCLS) is the first x-ray laser user facility based upon a free electron laser (FEL). In addition to many other stringent requirements, the LCLS XFEL requires extraordinary beam quality to saturate at 1.5 angstroms wit
Externí odkaz:
http://arxiv.org/abs/1503.05877
Autor:
Rao, Triveni, Dowell, David H.
Since the discovery of electrons more than a century ago, the generation, transport and characterization of electron beams has been an active field of research. Breakthroughs in this field have led to applications as far reaching as cancer treatment,
Externí odkaz:
http://arxiv.org/abs/1403.7539
Publikováno v:
In Nuclear Inst. and Methods in Physics Research, A 2006 557(1):61-68
Publikováno v:
In Nuclear Inst. and Methods in Physics Research, A 11 July 2003 507(1-2):181-185