[fluka-discuss]: RE: Difference between Beam Momentum and Lab momentum

From: Joachim Vollaire <joachim.vollaire_at_cern.ch>
Date: Fri, 10 Apr 2015 16:15:03 +0000

Dear Shakeel,

Could you send your entire input to the list so I can try to identify the reason of the crash ? Is the limit in the PHYSICS card sufficiently large enough for initialization ?

The momentum for one beam is 208 * 1380 GeV in your case. For the two beams it makes 574000.0 GeV if this is your question.

Greetings
Joachim


-----Original Message-----
From: Shakeel Ahmed, Dr. [mailto:shakeel_at_pinstech.org.pk]
Sent: 08 April 2015 12:30
To: Joachim Vollaire; fluka-discuss_at_fluka.org
Subject: RE: Difference between Beam Momentum and Lab momentum

Dear Joachim Vollaire
My input file is like this
BEAM 1380.0 HEAVYION
HI-PROPE 82. 208.
SPECSOUR 574000.0 0. 0. 0. -172000.0CROSSSYM
SPECSOUR 0.0016 0.0016 0. HEAVYION 208. &
SPECSOUR 82. &&
PHYSICS 5520. LIMITS

but it crashed, what would be the mistake?. The quantity 574000 is lab momentum but what is the difference between lab momentum and beam momentum per nucleon?

thanks
shakeel________________________________________
From: Joachim Vollaire [joachim.vollaire_at_cern.ch]
Sent: Thursday, March 12, 2015 9:37 PM
To: Shakeel Ahmed, Dr.; fluka-discuss_at_fluka.org
Subject: RE: Difference between Beam Momentum and Lab momentum

Dear Shakeel

I believe you would like to run heavy ion interactions as the ones in the LHC. The center of mass energy for the collision (so far) corresponds to 2.76 TeV per colliding nucleon pair or 1.38 TeV/nucleon.
You would first need to define the lead beam with the BEAM and HI-PROPRE card
BEAM 1380.0 HEAVYION
HI-PROPE 82.0 208.0
And for SPECSOUR you would need something like this in that case
SPECSOUR 574000. CROSSSYM
SPECSOUR 208.0&
SPECSOUR 82. &

And as stated in the manual for DPMJET energy range, you should not forget to link DPMJET (ldpmqmd script) and to have a physics card with the maximum center of mass momentum (SDUM LIMITS) for initialization purpose Hoping this help Greetings Joachim


-----Original Message-----
From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Shakeel Ahmed, Dr.
Sent: 10 March 2015 07:09
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: Difference between Beam Momentum and Lab momentum

Dear All
I will appreciate if some one let me know the answers of the following 1. Momentum and lab momentum in FLUKA cards 2. Relation between Energy and momentum e.g I want to run heavy ion interaction, say at 3Tev how should I calculate momentum that should be entered in SPECSOUR card with + and - sign thanks in advance shakeel __________________________________________________________________________
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Received on Fri Apr 10 2015 - 19:54:00 CEST

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