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Title: Channeling and radiation experiments at SLAC

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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); INFN Italy
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0168-583X
DOE Contract Number:
Resource Type:
Resource Relation:
Journal Name: Nuclear Instrumentation and Methods (NIM); Conference: Invited talk 7th International Conference on Charged & Neutral Particles Channeling Phenomena (Channeling 2016), 25-30 Sep 2016. Sirmione, Italy
Country of Publication:
United States

Citation Formats

Wienands, U., /Argonne, Gessner, S., Hogan, M.J., and M. Channeling and radiation experiments at SLAC. United States: N. p., 2017. Web. doi:10.1016/j.nimb.2017.03.097.
Wienands, U., /Argonne, Gessner, S., Hogan, M.J., & M. Channeling and radiation experiments at SLAC. United States. doi:10.1016/j.nimb.2017.03.097.
Wienands, U., /Argonne, Gessner, S., Hogan, M.J., and M. Tue . "Channeling and radiation experiments at SLAC". United States. doi:10.1016/j.nimb.2017.03.097.
title = {Channeling and radiation experiments at SLAC},
author = {Wienands, U. and /Argonne and Gessner, S. and Hogan, M.J. and M},
abstractNote = {},
doi = {10.1016/j.nimb.2017.03.097},
journal = {Nuclear Instrumentation and Methods (NIM)},
number = ,
volume = ,
place = {United States},
year = {Tue May 02 00:00:00 EDT 2017},
month = {Tue May 02 00:00:00 EDT 2017}

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  • The photoinjector at the new Fermilab FAST facility will accelerate electron beams to about 50 GeV. After initial beam commissioning, channeling radiation experiments to generate hard X-rays will be performed. In the initial stage, low bunch charge beams will be used to keep the photon count rate low and avoid pile up in the detector. We report here on the optics solutions, the expected channaling spectrum including background from bremmstrahlung and the use of a Compton scatterer for higher bunch charge operation.
  • We present a series of laser-driven particle acceleration experiments that are aimed at studying laser-particle acceleration as an inverse-radiation process. To this end we employ a semi-open vacuum setup with a thin planar boundary that interacts with the laser and the electromagnetic field of the electron beam. Particle acceleration from different types of boundaries will be studied and compared to the theoretical expectations from the Inverse-radiation picture and the field path integral method. We plan to measure the particle acceleration effect from transparent, reflective, black, and rough surface boundaries. While the agreement between the two acceleration pictures is straightforward tomore » prove analytically for the transparent and reflective boundaries the equivalence is not clear-cut for the absorbing and rough-surface boundaries. Experimental observation may provide the evidence to distinguish between the models.« less
  • A short bunch of relativistic particles or a short-pulse laser perturbs the density state of conduction electrons in a solid crystal and excites wakefields along atomic lattices in a crystal. Under a coupling condition the wakes, if excited, can accelerate channeling particles with TeV/m acceleration gradients in principle since the density of charge carriers (conduction electrons) in solids n 0 = ~ 10 20 – 10 23 cm -3 is significantly higher than what can be obtained in gaseous plasma. Nanostructures have some advantages over crystals for channeling applications of high power beams. The dechanneling rate can be reduced andmore » the beam acceptance increased by the large size of the channels. For beam-driven acceleration, a bunch length with a sufficient charge density would need to be in the range of the plasma wavelength to properly excite plasma wakefields, and channeled particle acceleration with the wakefields must occur before the ions in the lattices move beyond the restoring threshold. In the case of the excitation by short laser pulses, the dephasing length is appreciably increased with the larger channel, which enables channeled particles to gain sufficient amounts of energy. This paper describes simulation analyses on beam- and laser (X-ray)-driven accelerations in effective nanotube models obtained from Vsim and EPOCH codes. Experimental setups to detect wakefields are also outlined with accelerator facilities at Fermilab and NIU. In the FAST facility, the electron beamline was successfully commissioned at 50 MeV and it is being upgraded toward higher energies for electron accelerator R&D. The 50 MeV injector beamline of the facility is used for X-ray crystal-channeling radiation with a diamond target. It has been proposed to utilize the same diamond crystal for a channeling acceleration POC test. Another POC experiment is also designed for the NIU accelerator lab with time-resolved electron diffraction. Recently, a stable generation of single-cycle laser pulses with tens of Petawatt power based on thin film compression (TFC) technique has been investigated for target normal sheath acceleration (TNSA) and radiation pressure acceleration (RPA). The experimental plan with a nanometer foil is discussed with an available test facility such as Extreme Light Infrastructure – Nuclear Physics (ELI-NP).« less