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Forum: Documentation and Examples
Re: None Any new manual for G4eBremsstrahlung (Hongyu Jiang)
Re: None Re: Any new manual for G4eBremsstrahlung (michel maire)
Re: None Re: Any new manual for G4eBremsstrahlung (Hongyu Jiang)
Date: 12 Jan, 2004
From: michel maire <michel maire>

User Hongyu Jiang wrote:

>> Hello Vladimir and Michel,
>> 
>> Thanks for your reply. Maybe I was wrong, or I misunderstood some
>> detailes in the source code or the manual. I still can not match the
>> code to the manual.
>> 
>> For example, for calcuation of energy loss and cross section, the
>> equations are presented as (7.20) and (7.21) in the physics reference
>> manual. In my understanding, they are pretty much different from the
>> implementations in G4eBremsstrahlung::ComputerBremLoss() and
>> G4eBremsstrahlung::ComputeCrossSectionPerAtom(). According to the
>> manual, in calculation of the F factor in (7.20) and (7.21), 100
>> coefficents are required (C1 to C100), and there are two variables X and
>> Y (see (7.22)). However, in the code, only 11 coefficients are used
>> (defined in coefloss[NZ][Nloss] and coefsig[NZ][Nsig], and only one
>> variable xx = log10(T) is employed.
>> 
>> could you please clarify this to me?
>> 
>> Thanks a lot.
>> 
>> Hongyu

 Please accept my excuses. The parametrisation of dE/dx and cross section
 has been modified in August 2000, in order to improve the low energy
 part (1 keV->10 keV). But this mods has never been propagated to the
 Physics Reference Manual. This will be done asap.
 Thanks to have pointed out the problem.

 // File name:     G4eBremsstrahlung
 //
 // Creation date: 26.06.1996
 //
 // Modifications:
 //

 // 10-02-00 modifications , new e.m. structure, L.Urban
 // 07-08-00 new cross section/en.loss parametrisation, LPM flag , L.Urban
 // 21-09-00 corrections in the LPM implementation, L.Urban
 //
 

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