This page provides information on the pulse shape, luminosity and flux of neutrons and photons for the 23 neutron beam lines of the 1-MW pulsed-spallation neutron source in the MLF.
The data is summarized in an Excel spreadsheet. The Excel files are available for download, in the original format or in compressed format (lzh or zip).
| Type of Moderator | Number of Beam Ports | Time-integrated Thermal Neutron Flux | Peak Neutron Flux at 10 meV | Pulse Width in FWHM at 10 meV |
|---|---|---|---|---|
| - | [n/s・cm2] # | [n/eV・s・cm2] # | [µs] | |
| Coupled Moderator | 11 | 4.6 x 108 | 6.0 x 1012 | 92 |
| Decoupled Moderator | 6 | 0.95 x 108 | 3.0 x 1012 | 33 |
| Poisoned Moderator (Thicker Side) |
3 | 0.65 x 108 | 2.4 x 1012 | 22 |
| Poisoned Moderator (Thinner Side) |
3 | 0.38 x 108 | 1.4 x 1012 | 14 |
# Values at 10 m from the moderators
Pulse characteristics estimation for 23 neutron beam lines at JSNS (pdf)
(for neutron instrument design)
Calculation of high energy neutron spectra for 23 neutron beam lines at JSNS (pdf)
(for shielding design of a neutron beam line)
Photon spectra estimation for 23 neutron beam lines at JSNS (pdf)
(for background estimation in photon detectors used in a neutron instrument room)
J-PARC Center