Forgot Password | New Account

Computing for Science

The Computing for Science (CS) group supports ILL scientists, students and visitors in a number of activities including data analysis, instrument simulation and sample simulation.

Back to ILL Homepage

ILL Reactor models

H9 Beam tube description

  • Diameter: 210 mm
  • Angle from RHF origin: 294.8 deg
  • Type: thermal (D2O)
  • Distance from D2O vessel to the Bouchon: 4.53 m
  • Distance from noze to the D2O vessel: 0.98 m
  • Instrument using it: Tomography, Lohengrin PN1

This is ILL Data. Simulated by E. Farhi, P.A. Harraud and S. Fuard, 2006.

Simulation overview


Beam tube

Measurement Capture Flux
[1010 n/s/cm2 gold foil]

(dist from core center, date)

Comment

MCNP Capture Flux 
[1010 n/s/cm2]

Tripoli Capture Flux
[1010 n/s/cm2]

H9 (Tomography, PN1)


4.7 (5.23 m,16/03/2000)

phi=200 mm
Lohengrin collimates the beam

6.01 +/- 0.06 [Phi=7.2]

5.9 +/- 0.3 [Phi=7.1]

Flux measured and simulated with MCNP and Tripoli at 5.2 m from the core (bouchon). Phi is the integrate rwa flux. The Capture flux is the integrated weighted flux (lambda/1.8)
Flux distributions at the Vanne de securite/Bouchon (5.2 m from core)

  • Spatial: homogeneous, collimated by Lohengrin PN1
  • Divergence: gaussian, 0.97 horz 0.80 vert. deg half width.
  • Wavelength is not correlated to position
  • Wavelength is correlated to divergence.

Simulation results

All tallies/monitors are given at L+5.2 m from the reactor core, per cm2, and usually as log10(intensity).

Overview
[ ps ][ raw ]


Log Log energy full spectrum
[ ps ][ raw ]


Energy spectrum 0-100 meV

[ ps ][ raw ]


Wavelength spectrum [0-10 Angs]
[ ps ][ raw ]


Angular distribution (divergence)
[ ps ][ raw ]


Spatial distribution

[ ps ][ raw ]


Horizontal divergence - wavelength correlation

[ ps ][ raw ]