The OPAL Discussion Forum

[정숙영 <syjung419 AT skku.edu>]

Dear, 

 

Thank your for your effort to make this great code.!

And I will be appreciate for your advice to solve my problem related to OPAL.

 

When I was running my short input in single particle mode, I set some of parameters as below referenced by the example which you included.

 

-----------------------------------------------------------------------------------

Edes=1.0E-3;  

gamma=(Edes+HMMASS)/HMMASS;

beta=sqrt(1-(1/gamma^2));

gambet=gamma*beta;

P0=gamma*beta*HMMASS;

brho=(HMMASS*1.0E9*gambet) / CLIGHT;

value, {gamma,brho,Edes,beta,gambit};

 

//define beam parameters

beam1: BEAM, PARTICLE=HMINUS, pc=P0, NPART=1, CHARGE=-1.0, BCURRENT=1.0E-6, BFREQ=83.209;

-----------------------------------------------------------------------------------

 

But I couldn't understand exactly what these are meaning. These are my question list.

 

1. I guess the first parameter defined as "Edes" is the initial energy of my particle but I couldn't be sure. Is it right to set this 1.0E-3 for 1 MeV particle?

  

2. The parameter "brho" is automatically set as like that? I didn't use it in my input file directly so I am confused it is used inside the code as itself.

 

3. When I set "pc" in beam1, should it always have a value same as P0? If not, how can I determine its value?

 

4. Firstly, I want to do the simulation with a single particle. In this case, what is the purpose of BCURRENT and BFREQ? When I did a simulation without these two parameters, it doesn't work. Also, I use internal ion source for continuous beam (not as a bunched beam), what should be as BCURRENT and BFREQ?

 

 

Thank you for your reply in advance.

I am looking forward to get comments soon.

 

 

Best regards,

Sookyoung Jung