Difference between revisions of "Data Rates"

From DUNE
Jump to navigation Jump to search
Line 37: Line 37:
 
* all flavors, few tens of MeV
 
* all flavors, few tens of MeV
  
= Background =
+
= Background Sources =
 
== References ==
 
== References ==
 
* {{DocDB|4482|DocDB 4482}} - Craig Thorn's summary of Ar properties
 
* {{DocDB|4482|DocDB 4482}} - Craig Thorn's summary of Ar properties
 
* [http://arxiv.org/abs/astro-ph/0603131 Measurement of the specific activity of Ar-39 in natural argon]
 
* [http://arxiv.org/abs/astro-ph/0603131 Measurement of the specific activity of Ar-39 in natural argon]
  
== Some radiologicals ==
+
== Important radiologicals ==
 
* {{Ar39}} 1.01 Bq/kg &beta;<sup>-</sup> End-point: 0.565MeV
 
* {{Ar39}} 1.01 Bq/kg &beta;<sup>-</sup> End-point: 0.565MeV
 
* {{Kr85}} 0.1-0.3 Bq/kg &beta;<sup>-</sup> End-point: 0.687MeV
 
* {{Kr85}} 0.1-0.3 Bq/kg &beta;<sup>-</sup> End-point: 0.687MeV

Revision as of 12:09, 10 March 2015

Disclaimer

This page is in initial stages of construction.

Overview

According to the physics goals of the experiment, we need to consider the following main sources of signal:

  • The "beam neutrino" signal
  • The Supernova Burst (SNB) signal
  • Proton Decay
  • Solar neutrinos

All these signals have distinct energy scales, topologies and other characteristics. In terms of buffering and processing data in real or near time, they pose different requirements.

Beam Neutrinos

Because of the energy scale (~GeV range) neutrino interactions will be characterized by TPC signals well above radiological background. Zero-suppression will lead to significant reduction of data volume and rates (the detector will appear "empty" for the most part).

SNB

Reactions

νe+40Ar ⇒ e-+40K*

ν e+40Ar ⇒ e++40Cl*

νx+40Ar ⇒ νx+40Ar*

νe,x+e- ⇒ νe,x+e-

References

  • DocDB 6977 - Software for low-energy signals
  • DocDB 8481 - Summary of SNB Working Group Progress (February 2014)

Some reference curves from DocDB 6977:

SNB spectrum 1.png

In a nutshell:

  • approximately 100 events per kiloton, spread over ~30 seconds, ~½ in first second
  • all flavors, few tens of MeV

Background Sources

References

Important radiologicals

  • 39Ar 1.01 Bq/kg β- End-point: 0.565MeV
  • 85Kr 0.1-0.3 Bq/kg β- End-point: 0.687MeV