Early FLCD Simulation Strategies
mid-1997
My Overview
I see an evolving need for simulation packages for FLCD over the next 2-3
years:
detector design simulations for verifying the ideas developed out of
Snowmass '96, needed in the next 6-8 months prior to an international detector workshop.
simulation and analysis of test beam work that will happen before the
Design Report is put together.
Four routes are open to us:
| Strategy |
Evaluation |
| work inside the SLD system (Mortran, Jazelle, VMS) |
could not sell this to collaborators; time to move on |
| use C++, but write a wrapper around GEANT 3.21 |
will not look anything like GEANT 4 product; move on |
| use C++ and GISMO |
basics are there; needs work to define I/O |
| use C++ and GEANT 4. |
not ready yet. A 'friends-only' a release is out
and it is expected to be in b until early '99. But it is the
ultimate goal. |
I feel that we would move forward best by using GISMO. ATLAS has just accepted it as their
interim solution prior to using GEANT 4 in '99, so I expect this will cause a significant
bump in GISMO's support and documentation levels. Toby Burnett has tried hard to keep
GISMO in step with G4, but I must admit the two groups have had a serious falling out and
there is no cooperation from the G4 side (at least). I don't know how serious a problem
this is. Toby maintains it will be straightforward to migrate from GISMO to G4 when the
time comes, perhaps due to ATLAS's influence.
More Goals
I would also like to take this opportunity to exploit PCs and really learn how to use
them in a production compute mode, ie to do dataset production and analysis
on them as we have learned to do on VMS and unix.
Status
- A PC version of GISMO exists with a basic geometry definition: coil and barrel and
endcap EM and HAD calorimeters.
- An approximation of the EM calorimeter has been defined in which the 50 layers of Si-W
are cylinders.
- Sufficient digitization has been defined to gather the energy up into towers segmented
in (q,j).
- The major hangup at the moment is that there is no mechanism to output structures. This
needs to be added. I hesitate to put in ASCII output and would prefer that root ntuples be
output directly.
- GISMO give the ability to readily view geometries and the digitizations.
|
 |
Technicalities
The code is written with MS Visual C++ and currently lives in Visual SourceSafe (a MS
code manager) on the SLDNT17 server. No port to unix has yet been made of the FLCD
version, though it should be easily doable since this is routine operation for GLAST.
I've been essentially the only one in the playpen and haven't been doing much with it
for the last couple of months,so it needs considerable tidying up.
I am in the process of hiring a University of Victoria CoOp student to work on this. He
should start in September.
Immediate Goals
- clean up the existing installation
- export it to unix and develop a mirroring scheme to keep it up to date
- define a less approximate geometry for all the calorimetry
- define the digitization scheme
- define an I/O mechanism
- write a wrapper for ISASUSY
R.Dubois Last Modified: 01/13/04 12:42