Re: Trackr common is full!!, increase the Mxtrck parameter

From: Vasilis Vlachoudis <>
Date: Mon, 25 Oct 2010 16:18:36 +0200

  Hi Maki,

then you have to find a suitable combination with the STEPSIZE and
MGNFIELD cards for the Minimum, Maximum step, Boundary accuracy and Max
In your case you were requesting a maximum angle (default) 57deg,
boundary accuracy of 1e-10cm and Maximum step of 700cm. It was ending,
by breaking the 57deg into too many substeps more than the maximum limit
in the trackr common of 2500.
To go to 1e-10 accuracy (which will exploded your CPU tracking time and
it wont make any sense either for the calculation) reduce the maximum
step in STEPSIZE down to 0.1cm


On 10/25/10 10:55, Chrysostomos Valderanis wrote:
> Dear Vasili,
> Thank you very much for the explanation. But putting 1e-4 to WHAT(2)
> is something I would prefer to avoid. I really would like to be able
> to have double precision accuracy in my tracking under the magnetic
> field and asking for a boundary accuracy of 1e-4 is not helping me.
> So, is there another way to achive double precision in tracking?
> Thank you again,
> Makis
> ------------------------------------------------------------------------
> *From:* Vasilis Vlachoudis
> *Sent:* Mon 25/10/2010 10:44
> *To:* Chrysostomos Valderanis begin_of_the_skype_highlighting
> end_of_the_skype_highlighting
> *Cc:*
> *Subject:* Re: Trackr common is full!!, increase the Mxtrck parameter
> Dear Maki,
> the problem was coming from the too small value set in WHAT(2) of
> MGNFIELD. You have requested as upper limit for the boundary accuracy
> 1e-10cm during the tracking in the mangetic field. Therefore it was
> forcing the code to make small steps to check for the boundary leading
> to and overflow in the trackr common. Please increase the WHAT(2)
> e.g. 1e-4 and you will see that the message will disappear.
> FLUKA was displaying only the first ten messages in order not to flood
> your output with such messages.
> Regards
> Vasilis
> On 10/18/10 08:31, Chrysostomos Valderanis wrote:
>> Hello,
>> I am trying to run a simple example and I get this message in the
>> first event of the err file. My questions
>> 1. Is it an error or a warning. It doesn't seem to influence the
>> result, but the fact that is written to the error file is worrying.
>> 2. Since only tracking is involved, shouldn't it be also produced in
>> the other events? Is it suppressed?
>> 3. How to avoid it? I thought that enlarging the maximum step in the
>> magnetic field was going to remove it, since the magnetic field
>> region was going to be passed in one step, but it isn't the case.
>> 4. changing the mxtrck parameter in the Trackr include module. It
>> gives an error in the linking.
>> Thank you,
>> Makis
> --
> -------------------------------------------------------
> Vasilis Vlachoudis
> Web:
> Tel: +41-22-7679851
> Fax: +41-22-7669644
> -------------------------------------------------------

Vasilis Vlachoudis
Tel: +41-22-7679851
Fax: +41-22-7669644
Received on Tue Oct 26 2010 - 08:46:48 CEST

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