From: Alfredo Ferrari (alfredo.ferrari@cern.ch)
Date: Mon Apr 21 2003 - 19:02:43 CEST
Hi
the only results you should compare with for TARC are those officially
published by the TARC collaboration: in their papers their report FLUKA
simulations which are correct and in agreement with the present code.
I assume you have the papers from TARC (one is a 250 page long NIM paper
where also all simulation details are discussed).
I do not know ref. [2], maybe what they did is correct, surely what has
been done in the TARC published papers is the "right" numbers you should
get out of the code and their simulation was very careful.
There is no way that the code results change by as much as 30-50% from one
version to another. There should be an obvious mistake or in your numbers
or in those of ref. [2].
Regards
Alfredo Ferrari
On Mon, 21 Apr 2003, Dipanwita Dutta wrote:
> We like to clarify the following two points regarding the FLUKA simulation for the
> two input files attached (test.inp and cernexp.inp) as we find discrepancies
> with respect to the published works of Refs. [1] and [2].
>
>
> (1)
> We have done simulation with FLUKA 2002 version 1.0 (Jul. -02). The neutron production
> per proton (corrected for the corresponding detector efficiency) has been presented
> [Table 1] as a function of incident proton beam energy for a cylindrical Pb target of length L= 35 cm and diameter d=15 cm and compared with the available published results of different other Monte Carlo codes and results from NESSI Experiment (Ref. [1]).
>
>
> Table 1 Comparison of neurtron yield fron FLUKA with other Monte-Carlo codes and experimental results:
> ----------------------------------------------------------------------------------
>
> Beam HERMES LCS Experiment FLUKA
> Energy <------------------> <------------------> <-------------------> <----->
> (GeV)
> <Mn> Preac Nn/p <Mn> Preac Nn/p <Mn> Preac Nn/p Nn/p
> 1.2 21.4 0.867 18.5 22.2 0.863 20.3 22.2 0.848
18.8 16.6
> 1.8 29.2 0.869 25.4 31.2 0.864 26.9 30.5 0.853 26.0 23.3
> 2.5 37.7 0.865 32.6 40.5 0.860 34.8 38.4 0.848 32.6 29.5
>
> We obseved that the neutron multiplicity from FLUKA simulation are lower than the other MC codes as well as the experimental values (NESSI). We want to confirm whether
> our results are O.K. as we don't have any published results from FLUKA for the
> above dimension of the Pb target. The input file we used is attached (test.inp).
>
>
> (2)
> We tried to compare our FLUKA simulation output with the published result
> from Ref. [2] which discuss about the comparison of FLUKA and LCS simulations
> for the target used in the TARC experiment.
>
> In TARC experiment Pb target used of dimension 3.3 X 3.3 X 3 m3 and
> proton beam of 2 cm diameter was guided into the target through a blind
> hole of diameter 7.7 cm and length 120 cm .
>
> Results of FLUKA and LCS simulation codes is given in the table (Ref.[2]).
>
> Proton Energy FLUKA LAHET FLUKA
> (GeV) (Ref. [2]) (Ref. [2]) (our results)
> 0.7 18.75 21.20 14.33
> 1.0 31.01 35.19 22.46
> 2.0 68.34 75.75 43.86
>
> We observe discrepancy between the published result (Ref. [2]) and our simulation using FLUKA-2002.The input file we used is also attached for your verification (cernexp.inp).
>
> Reference:
> [1] D. Filges et al. ISSN 1433-559X, ESS 118-08-T. Aug 2001, A. Letourneau
> et al. NIM B 170 (2000) 299.
> [2] Hashemi-Nezhad et al. Kerntechnik 66 (2001) 1.
>
> ----------------------------------------------------------------------------
> | Dipanwita Dutta | Phone: 91-22-25592041 (Off.) |
> | Scientific Officer | 91-22-25589546 (Res.) |
> | Nuclear Physics Division | |
> | Bhabha Atomic Research Centre | Email: ddutta@apsara.barc.ernet.in |
> | Trombay, Mumbai-400085, India | dutta_dipanwita@rediffmail.com |
> ---------------------------------------------------------------------------
>
>
-- +----------------------------------------------------------------------------+ | Alfredo Ferrari || Tel.: +41.22.767.6119 | | CERN-AB || Fax.: +41.22.767.7555 | | 1211 Geneva 23 || e-mail: Alfredo.Ferrari@cern.ch | | Switzerland || Alfredo.Ferrari@mi.infn.it | +----------------------------------------------------------------------------+
This archive was generated by hypermail 2.1.6 : Tue Jun 10 2003 - 14:47:42 CEST