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Bug #3098

GEANT4 4.9.5p01 bug

Added by Gavin Davies about 7 years ago. Updated about 7 years ago.

Status:
Closed
Priority:
Urgent
Assignee:
-
Category:
-
Start date:
11/01/2012
Due date:
11/09/2012
% Done:

0%

Estimated time:
Duration: 9

Description

A bug has been discovered by mu2e folks in geant4 4.9.5p01 - the version we are currently using in development (and tag S12-10-04, S12-10-07).
Here's the problem:
Some particles created by the physics process named hadElastic are
born with a creation time earlier than that of their mother, sometimes
by many thousands of ns! This completely messes up the aggregation of
steps into hits.

The bug is not present in 4.9.4.p02 and nor in 4.9.5.p02, which has been released.
We will get new tarballs as soon as possible.

History

#1 Updated by Xinchun Tian about 7 years ago

If this new Geant4 is ready for this production, we can use Geometries with Air instead of Vacuum. I have put the Geometries with Air into the repository.

#2 Updated by Gavin Davies about 7 years ago

Xinchun, I am not aware of GEANT4 addressing the crazy electrons in air showers. If you are aware of a fix and can verify please let me know, otherwise we will continue to use the vacuum gdml files.

In order to use the Air files I need to see verifications.

#3 Updated by Gavin Davies about 7 years ago

  • Status changed from New to Resolved

We now use GEANT4 4.9.5.p02 which patches the bug reported herein.

#4 Updated by Gavin Davies about 7 years ago

  • Status changed from Resolved to Closed


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