Difference between revisions of "CrossTalk"

From New IAC Wiki
Jump to navigation Jump to search
Line 8: Line 8:
 
=Detector physics=
 
=Detector physics=
 
==Summary==
 
==Summary==
Neutron energy deposition from collisions with hydrogen and carbon are converted to electron equivalent light output by MCNP-POLIMI. Neutron collisions that all occur whithin a pulse collection time of 10 ns of each other are summed. If a pulse's total light output exceeds 0.03 MeVee, it is considered a detection.  The value 0.03 MeVee was chosen as the detector's light output threshold because it corresponds to a mean neutron energy deposit of 0.2 MeV.  
+
Neutron energy deposition from collisions with hydrogen and carbon are converted to electron equivalent light output (MeVee) by MCNP-POLIMI. Neutron collisions that all occur within a pulse collection time of 10 ns of each other are converted to MeVee and cumulated. If the cumulative light output exceeds 0.03 MeVee then it is considered a detection.  The value 0.03 MeVee was chosen because it corresponds to a mean neutron energy deposit of 0.2 MeV.
  
 
==Detectpor responce==
 
==Detectpor responce==

Revision as of 21:39, 18 July 2016

Go back MCNP simulations

Geometry

An array of 6 detectors are placed radially at a distance of 1 meter from an uncorrelated 252-CF source. The image below shows a top down view of the simulation geometry. The detector setups have a vertical extent of 30".

GeomEdited.png

Detector physics

Summary

Neutron energy deposition from collisions with hydrogen and carbon are converted to electron equivalent light output (MeVee) by MCNP-POLIMI. Neutron collisions that all occur within a pulse collection time of 10 ns of each other are converted to MeVee and cumulated. If the cumulative light output exceeds 0.03 MeVee then it is considered a detection. The value 0.03 MeVee was chosen because it corresponds to a mean neutron energy deposit of 0.2 MeV.

Detectpor responce

The electron equivalent (MeVee) conversion functions for neutrons were measured for plastic (BC 420) scintillators as a function of neutron energy deposit, [math]E_{n}[/math]. For deposit on hydrogen the measurements fit the following quadratic function:

[math]L=0.036E_{n}^{2}+0.125E_{n}[/math]

and for deposit on carbon:

[math]L=0.02E_{n}[/math]

A light output of 0.03 MeVee corresponded to an average neutron energy deposition of 0.2 MeV in the scintillator.

Go back MCNP simulations