Geometries for 2008 DC Review
The text below was copied and modified slightly from the README file originally written to describe the geometry files:
Here are some files used to produce radiation length scans for the Feb 1, 2008 FDC review. Here is the source of each of the four geometries: march2007 -------- This was the geometry used for the March 2007 DC review obtained via: svn cat -r 2403 https://halldsvn.jlab.org/repos/trunk/src/programs/Simulation/HDGeant/hddsGeant3.F > hddsGeant3.F The resulting file had a global search and replace of "stemax = 0" to "stemax = 1" in order to get a proper scan with AUTO set to zero in the control.in file. wiresonly --------- This was modified from revision 3198 of: https://halldsvn.jlab.org/repos/trunk/home/davidl/devel/FDCwiresonly/src/hdds The CentralDC, StartCntr, and CerenkovCntr files were copied from the main trunk and the location of the Cerenkov master volume was modified by hand in main_HDDS.xml from z=407 to z=466 to be consistent with the baseline geometries. This really doesn't matter for tracking, but can save some explanation when showing the plots. This also was the only executable made from different HDGeant source (sans the hddsGeant3.F file obviously). This used the code in the following: https://halldsvn.jlab.org/repos/trunk/home/davidl/devel/FDCwiresonly/src/HDGeant_calib CD3_dualcathodes -------- This was a modified version of revision 3198 from: https://halldsvn.jlab.org/repos/trunk/src/programs/Simulation/HDGeant The modifications were: 1. Replace the FDK1 and FDJ1 volumes in forwardDC_chamber_2 with FDK2 and FDJ2. Similarly for packages 3 and 4. This I believe was a typo and I notified RTJ via e-mail. However, I did not commit the changes since I wanted him to verify them first and commit them himself. 2. Replace the material type in FDJ1, FDJ2, ... with pure Kapton. The repository version used CopperKaptonEpoxy with I think was another typo. Similarly, RTJ was notified, but I kept the changes local. CD3_dualcathodes_nocables -------- This is an axact copy of the CD3_dualcathodes geometry except the signal cables have been commented out completely. CD3_singlecathodes ------- This used a modified version of the baseline hddsGeant3.F file. A set of 4 volumes were defined (FDL1, FDL2, FDL3, and FDL4) that corresponded to the FDK1, ... volumes. These were used to replace the second(downstream) cathode plane with 26 microns of "AluminizedMylarFilm".
Radiation Length Scans
Here are some radliation length scans done using (some of) the geometries above.