[Olympus] Simulation design paper

[Michael Kohl]

Dear Jan and Axel,
thank you for posting your technical note on simulations for OLYMPUS.
I have two immediate comments.

1) I agree that convoluting time-dependent effects and other effects and 
imperfections into the MC will provide the correct ratio and TPE effect. 
However, some "corrections" are still useful to be accounted for in the 
measured data. For example, if the scattering angle in some areas of the 
detectors, or at certain times, is not correctly determined, then one 
would *not* like to "spoil" the MC to make it equally wrong (while it will 
maintain the correct data/MC ratio), but apply the necessary corrections 
to the data. 
So we still need to draw the line of what should be "corrected" (e.g. beam 
offsets, as they affect the scattering angle), versus what should be put 
into the MC. Some such "corrections" applied to measured data will give a 
"clearer" picture of the data, rather than making the MC appear diffuse, 
too. This is also important in view of graphically representing the data, 
rather than only quoting the final result for the ratio.


2) Quasi-random numbers: This is fine if the number of dimensions is low. 
I remember that there are possible issue for "highly-differential" cross 
sections. So it might be ok for OLYMPUS but it should be looked at.


Best regards
   Michael



On Mon, 18 Feb 2013, Jan C. Bernauer wrote:

> Hi all,
>
>  Please find attached the paper Axel and I wrote regarding the
> simulation design.
>
> Axel will present the salient points at the meeting and I will give an
> overview of the current state.
>
> The file is also linked in the wiki:
> https://olympus-docu.hiskp.uni-bonn.de/dokuwiki/doku.php?id=ana-doc&#simulation
>
>
> Best,
> Jan
> -- 
> Dr. Jan C. Bernauer
> DESY/Olympus
> Notkestrasse 85, 22607 Hamburg, D
> Tel: +49 40 8998 6402
>
> Massachusetts Institute of Technology
> 77 Massachusetts Ave, Room 26-441
> Cambridge, MA, 02139, USA
> Phone:  (617) 253-6580
> -------------- next part --------------
> A non-text attachment was scrubbed...
> Name: sim_paper.pdf
> Type: application/pdf
> Size: 197720 bytes
> Desc: not available
> Url : http://mailman.mit.edu/pipermail/olympus/attachments/20130218/d551f5b2/attachment.pdf
> _______________________________________________
> Olympus mailing list
> Olympus at mit.edu
> http://mailman.mit.edu/mailman/listinfo/olympus
>

+---------------------------------------------------------------------
| Dr. Michael Kohl, Assistant Professor and Staff Research Scientist
| Physics Department, Hampton University, Hampton, VA 23668
| Jefferson Lab, C117, 12000 Jefferson Avenue, Newport News, VA 23606
| Phone: +1-757-727-5153 (HU), +1-757-269-7343 (Jlab)
| Fax:   +1-757-728-6910 (HU), +1-757-269-7363 (Jlab)
| Email: kohlm at jlab.org
| Cell:  +1-757-256-5122 (USA)
|
| Deutsches Elektronen-Synchrotron DESY, Bd. 66, Rm. 6,
| Phone: +49-40-8998-6406, Cell: +49-171-101-1967
+---------------------------------------------------------------------