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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.

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ILL Reactor models

H1 beam tube, cold (VCS, feeding cold guides to ILL7)

  • Diameter: 280 mm
  • Angle from RHF origin: 108.6 deg
  • Type: cold VCS
  • Distance from D2O vessel to the Bouchon: 4.6 m
  • Distance from noze to the D2O vessel: 0.36 m
  • Instrument using it: D17, FIGARO, IN5, IN6, IN10, D7, D11, IN12, LADI, IN11.
  • Reactor cut showing MCNP geometry [ pdf ]

This is ILL Data. Simulated by E. Farhi, P.A. Harraud (DS/CS) and S. Fuard (DPT/BPC), 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]

H1 (IN17, FIGARO, IN5, IN6, IN10, D7, D11, IN12, LADI, IN11)


2.60 (H113-1: 11.4 m, 11/08/1999)

phi=280 mm

11.0+/- 0.1 [Phi=6.8]
2.72 +/- 0.08 [at 11.4 m, Phi=1.04]

11.6 +/- 0.7 [Phi=6.9]
1.87 +/- 0.4 [at 11.4 m, Phi=.69]

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). Fluxes given here assume NO guide.
Flux distributions at the Vanne de securite/Bouchon (5.2 m from core)

  • Spatial: homogeneous.
  • Divergence: gaussian, 0.97 deg half width horizontally and vertically.
  • 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 ]