Abstract
The scientific and technical advances continue to support novel discoveries by allowing scientists to acquire new insights into the structure and properties of matter using new tools and sources. Notably, neutrons are among the most valuable sources in providing such a capability. At the Institute of Laser Engineering, Osaka, the first steps are taken towards the development of a table-top laser-driven neutron source, capable of producing a wide range of energies with high brightness and temporal resolution. By employing a pure hydrogen moderator, maintained at cryogenic temperature, a cold neutron (le 25hbox { meV}) flux of sim 2times 10^3hbox { n/cm}^2/pulse was measured at the proximity of the moderator exit surface. The beam duration of hundreds of ns to tens of upmu hbox {s} is evaluated for neutron energies ranging from 100s keV down to meV via Monte-Carlo techniques. Presently, with the upcoming J-EPoCH high repetition rate laser at Osaka University, a cold neutron flux in orders of sim 1times 10^{9}hbox { n/cm}^2/hbox {s} is expected to be delivered at the moderator in a compact beamline.
Highlights
The scientific and technical advances continue to support novel discoveries by allowing scientists to acquire new insights into the structure and properties of matter using new tools and sources
With energies of above tens of keV, they are continuously accelerated with a mean free path of 100s of μm. As they propagate through the target into the vacuum, a sheath field at the rear side is produced, leading to the creation of a strong driving force, resulting in ions being accelerated to tens of MeV16 in a scheme known as Target Normal Sheath Acceleration (TNSA) 17
We report the progress towards the experimental demonstration of a cold neutron source produced by an ultraintense short-pulsed laser
Summary
The scientific and technical advances continue to support novel discoveries by allowing scientists to acquire new insights into the structure and properties of matter using new tools and sources. An important difference between the fission and spallation mechanism is the number of useful neutrons produced per event, for instance, with the thermal fission of 235 U, a portion of the neutrons are absorbed by the fuel to sustain the chain reaction, whereas in spallation that is not the case, a higher flux of neutrons at the sample is available Another notable advantage of spallation sources is the neutron burst duration, which is defined by the length of the driving ion bunch, and it is usually around tens of μ s compared to ms in r eactors[7,8,9]. Due to the high charge-to-mass ratio of hydrogen isotopes compared to heavier ions
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
