Prototype of electron shower parameterization is now working (Dave Tedeschi, Maurik Holtrop) and being tested (Mike Vineyard)
Prototype version of automated GSIM/CELEG control and tracking system now functional (Greg Riccardi)
Formation of a dedicated event generator group (Dan Sober, Gabriel Niculescu, Stepan Stepanyan, John Price, Bryan Carnahan, others?)
Created tagger banks for photon beam simulations (Franz Klein)
Comparative study of acceptances obtained from fiducial cuts on data, and on simulated data with and without fiducial cuts (Kyungseon Joo)
Performed region-dependent smearing of drift chamber position data, and applied dead wire map to GSIM data using GSIMKO (Kyungseon Joo, Dennis Weygand, Joe Manak)
Run simulations supporting speakers at Bonn conference and Sante Fe conference (~20 million events) (Cole Smith, Junho Yun, David Rowntree)
Cooking of GSIM data using same methods and code as for experimental data(Costy Loukachine)
Implemented first version of the electron library scheme(Stepan Stepanyan)
List of near-term projects
large-scale cooking of GSIM data
large-scale application of DOCA smearing and dead wire map
transition to exclusive use of automated run control and accounting system, including keeping parameter banks from GSIM/CELEG.
implement polarized target field and geometry in GSIM with new target location (z=-55 cm)
continue to support speakers at conferences and students writing theses
document what is and is not included in GSIM and attempt to assess the accuracy of geometry and materials for each volume
general improvements to CELEG (radiative corrections, elastic scattering cross section, deep inelastic scattering) and to the present arsenal of event generators
finish trigger simulator prototype
finish installing cryotarget geometry into GSIM, add event vertex position smearing
finish implementing the zero-electron-acceptance option in GSIM
perform testing of electron shower parameterization
Experience in calculating acceptances
Who has calculated acceptances/related quantities?(that I know of)
Kyungseon Joo - extensive work with GSIM acceptance calculations as well as parameterized acceptance functions. Significant contamination of signal with radiative tail from elastic scattering. Large acceptance.
Claude Marchand et al. - developing single-particle acceptance scheme based on GSIM single-particle events. Recently got reconstruction to work on these events.
Richard Thompson - extensive single-particle parameterized acceptances, GSIM work underway. Fairly large acceptance, some background.
Latifa Elaouadrhiri - initial work with GSIM acceptance functions, more coming soon. Fairly small acceptance.
Hovanes Egiyan - extensive work with GSIM acceptance calculations as well as parameterized acceptance functions. Large acceptance, little background.
Steve Barrow & Si McAleer - extensive work with SDA acceptance calculations, GSIM calculations coming soon. Acceptance change in the interesting variables appears to change extremely rapidly.
Costy Loukachine - initial work with GSIM acceptance functions, more work presently underway. Very small acceptance, large backgrounds.
Issues and problems
Scheduled requests for GSIM runs is growing, while available CPU time is shrinking. Situation is ok for now, but won't be for long.
The basic cpu power of the available distributed farm is too small.
1000 Hz data rate x 35/52 x 50% = 340 Hz (annualized data rate)
GSIM: 0.5 - 1 Hz/cpu, x fraction of availability of cpu, typically 0.4 for our 25 cpus.
Order of magnitude: simulated data production rate is a factor of 50 slower than the data rate, assuming 100% duty factor for cpu farms.
Lots of mitigating factors, but can't hope to compensate for such a huge disparity.
Not clear that a conservative fiducial cut will be suitable for all measurements. May require more attention to simulation accuracy near coils and at forward angles, or much more complicated, less conservative fiducial cuts.
Run proposals
(see GSIM focus group home page - E1 and G1 run proposals)
Guidelines for creating run proposals
(see GSIM focus group home page -Guidelines for creating run proposals)
Broad goals and challenges in the longer term
Build up a distributed farm (at JLAB and remote institutions) of 200-300 `cpu-equivalents' (200 MHz Pentium II Linux box) utilized ~40%for GSIM work in the two-year time frame
Make the transition to having a smoothly operating system:
can handle 5-10 proposals at once
runs are initiated by a simple, universal mechanism
run control and accounting is automated
runs are scheduled and completed in a timely manner
each file produced is fully documented on the web
reconstruction of simulated data is integrated cleanly into the `cooking' procedure
Move to GEANT 4
C++ based code, compatible with new CERN developments
reputed to be three times faster
natural opportunity to encapsulate geometry and other constants into a controllable database
extra manpower available
first version could be ready for testing in ~1 year, full deployment in 2 years
Collaboration to gain a deeper understanding of CLAS acceptance