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G4MagIntegratorDriver error [message #7710]

Wed, 21 January 2009 15:35

Tobias Stockmanns
Messages: 489
Registered: May 2007

first-grade participant

From: *ikp.kfa-juelich.de

Dear PandaRooters,

since my last update of pandaRoot from SVN I am getting the following error-message when I run runMvdSim.C before my root system stops working:

G4MagIntegratorDriver::OneGoodStep: Stepsize underflow in Stepper
Step's start x=7.74619 and end x= 7.74619 are equal !!
Due to step-size= 2.28754e-16 . Note that input step was 0.228754

This happens for various event generators and sub-detectors.

With GEANT3 everything seems to run smoothly.

Has anyone an idea what is going wrong?

Thanks

Tobias

P.S.: At a different run I got the following more complete error message:
G4MagIntegratorDriver::OneGoodStep: Stepsize underflow in Stepper
Step's start x=1.05216 and end x= 1.05216 are equal !!
Due to step-size= 2.10975e-17 . Note that input step was 0.0210975
G4ParticleChange::CheckIt : the Momentum Change is not unit vector !!
Difference: 1
G4ParticleChange::CheckIt
-----------------------------------------------
G4ParticleChange Information
-----------------------------------------------
# of 2ndaries : 0
-----------------------------------------------
Energy Deposit (MeV): 0
Non-ionizing Energy Deposit (MeV): 0
Track Status : Alive
True Path Length (mm) : 1.07
Stepping Control : 0
Mass (GeV) : 0
Charge (eplus) : 0
MagneticMoment : 0
: = 0*[e hbar]/[2 m]
Position - x (mm) : 658
Position - y (mm) : 740
Position - z (mm) : 3.4e+03
Time (ns) : 13.4
Proper Time (ns) : 0.0617
Momentum Direct - x : 0
Momentum Direct - y : 0
Momentum Direct - z : 0
Kinetic Energy (MeV): 22.7
Polarization - x : 0
Polarization - y : 0
Polarization - z : 0
Touchable (pointer) : 0xdfd1cd8

*** G4Exception : 200
issued by : G4ParticleChange::CheckIt
momentum, energy, and/or time was illegal
*** Event Must Be Aborted

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Re: G4MagIntegratorDriver error [message #7736 is a reply to message #7710]

Fri, 23 January 2009 09:26

Mohammad Al-Turany
Messages: 518
Registered: April 2004
Location: GSI, Germany

first-grade participant

From: *gsi.de

Hallo Tobias,

Is there anything special to do to reproduce this! with the trunk on 64 bit linux and MAC it is not reproducible! but I think this bug is related to the new field map classes! can you please tell me on which system you have this problem and maybe you can try to use a constant field and see if the problem still there or if it is not much work for you to use the old maps!

regards

Mohammad

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Re: G4MagIntegratorDriver error [message #7747 is a reply to message #7736]

Sun, 25 January 2009 10:56

asanchez
Messages: 350
Registered: March 2006

first-grade participant

From: *pools.arcor-ip.net

Hi I'm using the gsi installation sarge32 linux

and i'm using the following field configuration
as usual(old filed maps) and i get the same error
as Tobias.
For me it has been working before.
So what is going on wrong?

PndMultiField *fField= new PndMultiField();
PndTransMap *map= new PndTransMap("TransMap", "R");
PndDipoleMap *map1= new PndDipoleMap("DipoleMap", "R");
PndSolenoidMap *map2= new PndSolenoidMap("SolenoidMap", "R");
fField->AddField(map);
fField->AddField(map1);
fField->AddField(map2);
fRun->SetField(fField);

Cheers
alicia.

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Re: G4MagIntegratorDriver error [message #7750 is a reply to message #7747]

Mon, 26 January 2009 11:37

Mohammad Al-Turany
Messages: 518
Registered: April 2004
Location: GSI, Germany

first-grade participant

From: *gsi.de

Hi,

I managed to reproduce this only on Debian Sarge (gcc 3.3.5), it has to do with some initialization problems! any way I corrected some stuf in base and field and for me it is working now on Sarge, please test it and let me know!

Mohammad

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Re: G4MagIntegratorDriver error [message #7754 is a reply to message #7750]

Tue, 27 January 2009 09:27

asanchez
Messages: 350
Registered: March 2006

first-grade participant

From: *gsi.de

Hi Mohammad now it seems to work.
thanks
ALicia.

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