The following thresholds were used for transport:
Electrons-positrons | 1 MeV |
Photons | 0.1 MeV |
Neutrons | 10-11 MeV |
Antineutrons | 50 MeV |
All other particles | 0.1 MeV |
The results of simulations are presented in 2 tables:
- Table 1. Fluences and doses.
- Table 2. Particle spectra.
Fluences of neutrons, charged hadrons, electrons-positrons, high-energy
hadrons (Ekin > 20 MeV) and 1MeV-neutrons equivalent fluence for Si are shown in units of
particles per square cm per collision. Fluences of high-energy hadrons
are obtained as weighted sum of neutron fluence and charged hadrons fluence.
Corresponding weights are calculated from spectra for each location and
presented in the table. 1MeV-neutrons equivalent fluences for Si
are obtained as weighted sum of neutrons, charged hadrons and electrons
fluences. The weights are calculated as a convolution of spectra with the
non-ionising energy transfer cross-sections taken from
http://sesam.desy.de/members/gunnar/Si-dfuncs.html.
Calculated weights can be found here.
Dose is presented in units of Gy per collision.
Conversion factor per second with a luminosity L = 2*1032 is equal to 1.6*107 (1 LHC-year = 107 s, i.e. conversion factor per year is equal to 1.6*1014 ).
Each cell of table 1 represents a 2D map of fluence of particular type of particles or dose for particular plane crossing the detector.
Below the list of scoring planes is shown with their positions and dimensions (in cm).
Name |
x-positions, no of bins | y-positions, no of bins | z-position, no of bins |
HCAL | 0 – 600, 30 | 0 – 500, 25 | 1333.0 – 1333.07, 1 |
ECAL | 0 – 600, 30 | 0 – 500, 25 | 1248.5 – 1248.57, 1 |
SPD-PS | 0 – 600, 30 | 0 – 500, 25 | 1230.5 – 1230.57, 1 |
RICH1 * | 0-150, 30 | 0-125, 25 | 100.0 – 101.0, 1 |
CSRICH1 * | 0-150, 30 | 0-150, 30 | 160.0 – 161.0, 1 |
RICH2 | 0 – 600, 30 | 0 – 500, 25 | 1147.0 – 1147.07, 1 |
OTT3 | 0 – 350, 35 | 0 – 300, 30 | 921.0 – 921.07, 1 |
OTT2 | 0 – 350, 35 | 0 – 300, 30 | 852.0 – 852.07, 1 |
OTT1 | 0 – 350, 35 | 0 – 300, 30 | 783.0 – 783.07, 1 |
OTTT | 0 – 350, 35 | 0 – 300, 30 | 228.0 – 228.07, 1 |
ITT3 | 0 – 60, 60 | 0 – 60, 60 | 921.0 – 921.07, 1 |
ITT2 | 0 – 60, 60 | 0 – 60, 60 | 852.0 – 852.07, 1 |
ITT1 | 0 – 60, 60 | 0 – 60, 60 | 783.0 – 783.07, 1 |
ITTT | 0 – 60, 60 | 0 – 60, 60 | 228.0 – 228.07, 1 |
X-Section @ x=0.0* | 0.0 – 1.0, 1 | 10 – 400, 78 | 100 – 2000, 76 |
X-Section @ x=200* | 200.0 – 201.0, 1 | 10 – 400, 78 | 100 – 2000, 76 |
X-Section @ x=600 | 600.0 – 600.07, 1 | 10 – 400, 78 | 100 – 2000, 76 |
X-Section @ y=0* | 0 – 1000, 80 | 0 – 1.0, 1 | 0 – 2000, 80 |
Floor | -550.0 – 2000.0, 51 | -606.07 - -606.0, 1 | 300 – 1900, 32 |
X-Section @ x=0.0*(Vertex) | 0.0 - 1.0, 1 | 5.0 - 200.0, 39 | -200.0 - 600.0, 80.0 |
X-section @ y=0.0*(Vertex) | 5.0 - 200.0, 39 | 0.0 - 1.0, 1 | -200.0 - 600.0, 80.0 |
X-section @ z=70* | 0.0 - 300.0, 60 | 5.0 - 250.0, 49 | 70.0 - 71.0, 1.0 |
X-section @ z=20* | 0.0 - 300.0, 60 | 5.0 - 250.0, 49 | 20.0 - 21.0, 1.0 |
X-section @ z=0* | 0.0 - 300.0, 60 | 5.0 - 250.0, 49 | 0.0 - 1.0, 1.0 |
X-section @ z=-20* | 0.0 - 300.0, 60 | 5.0 - 250.0, 49 | -20.0 - 21.0, 1.0 |
VELO Sensor @~70cm | 0.0 - 5.0, 25 | 0.0 - 5.0, 25 | 73.47 - 73.5, 1 |
VELO Sensor @~20cm | 0.0 - 5.0, 25 | 0.0 - 5.0, 25 | 21.47 - 21.5, 1 |
VELO Sensor @~0cm | 0.0 - 5.0, 25 | 0.0 - 5.0, 25 | 0.47 - 0.5, 1 |
VELO Sensor @~-20cm | 0.0 - 5.0, 25 | 0.0 - 5.0, 25 | -17.5 - -17.53, 1 |
VELO Support @ ~70cm* | 5.0 - 50.0, 49 | 0.0 - 11.0, 22 | 73.6 - 73.7, 1 |
VELO Support @ ~20cm* | 5.0 - 50.0, 49 | 0.0 - 11.0, 22 | 21.6 - 21.7, 1 |
VELO Support @ ~0cm* | 5.0 - 50.0, 49 | 0.0 - 11.0, 22 | 0.6 - 0.7, 1 |
VELO Support @ ~-20cm* | 5.0 - 50.0, 49 | 0.0 - 11.0, 22 | -17.4 - -17.3, 1 |
Material of all scoring volumes except of the cases, marked with * in the table
, is silicon. In the cross-sections at X=0 and X=200 no special material is introduced. The dose is
scored in the actual material of the detector present in each point of the scoring volume.
For the rest of the cases material is air.
Each map is presented in the form of colour figure (pdf-file) and text file (2D PAW vector). See above for the binning. The text file can be downloaded (with SHIFT - mouse left button) and processed in PAW with PAW macro-file (pr_map.kumac). Download the macro-file (with SHIFT - mouse left button), run PAW, execute the file (exe pr_map), enter name of the file chosen and follow the instruction that will pop-up (please, do not change the names of map-files that you download!).
Accuracy of the data on fluences and doses depends on particles statistics in particular locations. No systematic analysis was performed regarding this issue. In practice one can estimate the statistical accuracy from the map itself. It varies from ~30% for neutron fluence in the central part of calorimeters to factor 10 for hadron fluence in the cavern. Particular care has to be taken when analysing data on doses. In case of small binning large dose fluctuations are possible due to heavily ionising particles (see for example doses for Inner tracker locations).
Particle spectra in table 2 are presented in two forms:
The list of the volumes where particle spectra are scored with their positions and dimensions (in cm) is shown below:
Name |
x-pos | y-pos | z-pos |
Floor | 1000 – 2000 | -606.07 - -606.0 | 300 – 1900 |
TT, inner part | 10 – 60 | 10 – 30 | 228.0 – 228.07 |
IT T1 | 10 – 60 | 10 – 30 | 783.0 – 783.07 |
IT T3 | 10 – 60 | 10 – 30 | 921.0 – 921.07 |
TT, outer part | 60 – 350 | 30 – 300 | 228.0 – 228.07 |
OT T1 | 60 – 350 | 30 – 300 | 783.0 – 783.07 |
OT T3 | 60 – 350 | 30 – 300 | 921.0 – 921.07 |
MU1 | 0 - 380 | 320 - 500 | 1147.0 – 1147.07 |
HCAL | 0 – 420 | 340 – 500 | 1333.0 – 1333.07 |
Vertex tunnel, z=5 | 60 – 200 | 60 – 150 | 5.0 - 5.07 |
Vertex tunnel, z=70 | 60 – 200 | 60 – 150 | 70.0 - 70.07 |
VELO sensor, z=0 | 0.7 - 4.7 | 0.7 - 4.7 | 0.478 - 0.5 |
VELO sensor, z=20 | 0.7 - 4.7 | 0.7 - 4.7 | 27.478 - 27.5 |
VELO sensor, z=70 | 0.7 - 4.7 | 0.7 - 4.7 | 73.478 - 73.5 |
VELO support, z=0 | 0.7 - 25 | -10 - 10 | 0.6 - 0.7 |
VELO support, z=70 | 0.7 - 25 | -10 - 10 | 73.6 - 73.7 |
Spectra of electrons-positrons, charged hadrons and charged pions have 12 bins in
logarithmic scale from 1 MeV to 1000GeV. Spectra of neutrons have 80 bins in log scale
from 10-11 MeV to 100 GeV.
Each EdF/dE spectrum is represented in the form of figure (ps-file) combining data for
neutrons, charged hadrons, charged pions and electrons-positrons. Corresponding text file
(2D PAW vector) combines data for charged hadrons (column 2), charged pions (column 3) and
electron-positrons (column 3). The first column is energy in GeV. Dimensions of the vector are
4*12.
Each cumulative spectrum is represented in the form of figure (ps-file) and text file (2D
PAW vector) that combines cumulative data (column 2) and EdF/dE data (column 3) for
neutrons. The first column is energy in GeV. Dimensions of the vector are 3*80.