|Message: Re: Problems with transportation with spin||Not Logged In (login)|
Click on the Forum title, e.g. on the "Forums by Category" page, to read a sequence of postings to the Forum and its threads all in one page. If you are only interested in one thread or the thread following a specific posting, click the thread or the posting, which takes you to a smaller page, which contains only the part you are interested in and may be easier to navigate.
Messages are "chained" if there are only replies at the first level, i.e. 1/1.html, 1/1/1.html etc. In case of "chained" messages the message number is replaced by the icon and there is no indentation.
Inline: Display the subject line only or also the text of the posting(s); for the choice "All" the "Outline" choices are switched off.
|1||0||1||no text / full text of posting|
|2||1||All||text for level 1 only / text for All postings|
Outline: Choose the depth of the posting thread, successive toggle controls provide increasing detail.
|1||2||1||2 levels / 1 level (original posting)|
|2||3||2||3 levels / 2 levels|
|3||3||All||3 levels / all levels (all postings)|
On Thu, 15 Mar 2012 20:50:42 GMT, Tom Roberts wrote: > 1. The G4Track global time is not updated. [...]
This problem has disappeared, using G4EqEMFieldWithSpin for the equation of motion.
I have plotted the precession of a single mu+'s spin for the BNL g-2 experiment, and it agrees with the experiment to 4-digit accuracy over 45 turns (no real fit was performed, which is needed to get better accuracy; this is just computing the period from an eyeball estimate of the 45th zero crossing).
In PreUserTrackingAction() my code now sets the anomaly for electrons and muons, and I have documented that spin tracking only applies to them. So #2 is handled.
Problem #3 was resolved by using G4EqEMFieldWithSpin.
So the only remaining problem is #4, the magnetic moment does not respond to a B-field gradient. Any suggestions?