Radiation studies with FLUKA99
Home Background E-mail Notes Meetings Subsystems Search

This page was last edited by LS & GC  on March 28, 2007 .

Radiation studies

Radiation levels in the LHCb cavern have been calculated with FLUKA99

Old results for the  "LHCb-Classic" layout (December 2001) can be found here.

Present results are obtained for the experimental layout corresponding to "LHCb-Classic-minus". Comments about the geometry are here.

  1. X view of the LHCb setup
  2. Y view of the LHCb setup
  3. Detailed X view of the VERTEX region
  4. Detailed Y view of the VERTEX region

Detailed explanations of the simulation conditions and results available can be found here

The tables below contains link to the results (postcript and maps) in different locations of the LHCb experimental setup regarding doses&fluences and spectra. 

A summary table with maximum and average radiation levels in selected regions is available from the Electronics web pages.

 

Doses&Fluences

  Dose Neutron fluence Charged hadrons fluence Electron/Positron fluence High energy hadrons (Ek>20MeV) 1MeV n-equivalent fluence for Si*
IT2 ps/map ps/map ps/map ps/map ps/map ps/map
IT3** ps/map ps/map ps/map ps/map ps/map ps/map
IT7 ps/map ps/map ps/map ps/map ps/map ps/map
IT8 ps/map ps/map ps/map ps/map ps/map ps/map
IT9 ps/map ps/map ps/map ps/map ps/map ps/map
OT2 ps/map ps/map ps/map ps/map ps/map ps/map
OT3** ps/map ps/map ps/map ps/map ps/map ps/map
OT4** ps/map ps/map ps/map ps/map ps/map ps/map
OT5** ps/map ps/map ps/map ps/map ps/map ps/map
OT6** ps/map ps/map ps/map ps/map ps/map ps/map
OT7 ps/map ps/map ps/map ps/map ps/map ps/map
OT8 ps/map ps/map ps/map ps/map ps/map ps/map
OT9 ps/map ps/map ps/map ps/map ps/map ps/map
RICH1 ps/map ps/map ps/map ps/map ps/map ps/map
RICH2 ps/map ps/map ps/map ps/map ps/map ps/map
SPD-PS ps/map ps/map ps/map ps/map ps/map ps/map
ECAL ps/map ps/map ps/map ps/map ps/map ps/map
HCAL ps/map ps/map ps/map ps/map ps/map ps/map
XS1 ps/map ps/map ps/map ps/map ps/map ps/map
XS2 ps/map ps/map ps/map ps/map ps/map ps/map
XS3 ps/map ps/map ps/map ps/map ps/map ps/map
Floor ps/map ps/map ps/map ps/map ps/map ps/map
VELO X=0 ps/map ps/map ps/map ps/map ps/map ps/map
VELO Y=0 ps/map ps/map ps/map ps/map ps/map ps/map
Sensor z=70 ps/map ps/map ps/map ps/map ps/map ps/map
Sensor z=20 ps/map ps/map ps/map ps/map ps/map ps/map
Sensor z=0 ps/map ps/map ps/map ps/map ps/map ps/map
Sensor z=-20 ps/map ps/map ps/map ps/map ps/map ps/map
Support z=70 ps/map ps/map ps/map ps/map ps/map ps/map
Support z=20 ps/map ps/map ps/map ps/map ps/map ps/map
Support z=0 ps/map ps/map ps/map ps/map ps/map ps/map
Support z=-20 ps/map ps/map ps/map ps/map ps/map ps/map
XS @z=70 ps/map ps/map ps/map ps/map ps/map ps/map
XS @z=20 ps/map ps/map ps/map ps/map ps/map ps/map
XS @z=0 ps/map ps/map ps/map ps/map ps/map ps/map
XS @z=-20 ps/map ps/map ps/map ps/map ps/map ps/map

(*) 1 MeV equivalent neutron fluence for Si was calculated using weighted sum of the neutrons, hadrons and electrons fluence maps. The weights were obtained by convolution of the particle spectra with the data on displacement damage in Si taken from http://sesam.desy.de/~gunnar/Si-dfuncs.html .

 (**) These locations do not correspond to any subdetector. However we consider this data useful for back compatibility with older results and continuity of the fluence/dose analysis.  

Spectra

  Differential spectra Cumulative spectra
OT2 ps / map ps / map
OT3 ps / map ps / map
OT9 ps / map ps / map
RICH2 ps / map ps / map
HCAL ps / map ps / map
Floor ps / map ps / map