11. "Old Gap" As a cross check and transfer simulation, a run with the old gap (GAPDZ=0.). 2. "Jul01 Baseline" (1) The gap is now officially increased by 4 cm. All previous gap studies had been done by moving only the front face of the endcap back and leaving the back end where it was (thinning the calorimeter). So it took some editing to propagate the 4 cm offset to the front of the JF shield. (2) The inner bore of the JD is copper, and is tapered along the same eta line as the rest of the forward shielding (not cylindrical). (3) The ion pump in front of the FCal is now the stainless steel model suggested by Ian. (4) The borated poly in the JT tapers from a thickness of 7 cm at the front to 4 cm at the back. This is in hopes that we could optimize the CSC region for neutrons and photons, and the middle MDT's for high energy hadrons in the same solution. Although modeled as a taper for convenience, this could no doubt be stepped-cylindrical and give the same results if it turns out to be a good solution. Small Wheel Large Wheel Back Wheel Barrel A B C D E F G CSC TGC MDT-in MDT-out MDT-back RPC-in RPC-out Old Gap N < 100 keV 37000.0 26200.0 6660.0 5420.0 2226.0 3304.0 3507.0 Jul01 Baseline N < 100 keV 37500.0 27000.0 6980.0 5680.0 2096.0 3369.0 3608.0 Change in % 1.4 3.1 4.8 4.8 -5.8 2.0 2.9 Old Gap N > 100 keV 29900.0 11300.0 1780.0 1200.0 634.0 756.0 733.0 Jul01 Baseline N > 100 keV 30200.0 11100.0 1870.0 1220.0 614.0 781.0 752.0 Change in % 1.0 -1.8 5.1 1.7 -3.2 3.3 2.6 Old Gap Photons 27900.0 11500.0 11500.0 4610.0 1310.0 1500.0 1540.0 Jul01 Baseline Photons 27800.0 11600.0 11900.0 4870.0 1310.0 1520.0 1590.0 Change in % -0.4 0.9 3.5 5.6 0.0 1.3 3.2 Old Gap Electrons 176.0 100.0 17.4 18.2 8.8 7.4 12.0 Jul01 Baseline Electrons 208.0 109.0 22.1 20.9 7.4 17.7 12.1 Change in % 18.2 9.0 27.0 14.8 -15.8 138.2 0.8 Old Gap Muons 127.0 19.3 9.9 3.1 1.8 0.8 0.4 Jul01 Baseline Muons 124.0 21.8 9.7 3.2 1.5 1.0 0.5 Change in % -2.4 13.0 -2.0 1.6 -17.7 23.8 14.2 Old Gap Protons 77.4 21.3 8.1 8.5 0.8 3.4 1.6 Jul01 Baseline Protons 73.8 20.1 9.0 9.3 0.8 3.3 1.8 Change in % -4.7 -5.6 12.2 8.3 -2.4 -2.9 12.3 Old Gap Hadrons 7520.0 1700.0 395.0 396.0 30.8 156.0 174.0 Jul01 Baseline Hadrons 7520.0 1610.0 420.0 406.0 30.1 155.0 175.0 Change in % 0.0 -5.3 6.3 2.5 -2.3 -0.6 0.6 Old Gap MDT rate 488.0 186.7 150.2 65.5 19.2 22.6 22.7 Jul01 Baseline MDT rate 487.6 190.1 156.0 69.4 18.7 24.3 23.5 Change in % -0.1 1.8 3.9 5.9 -2.2 7.2 3.4 Old Gap RPC rate 282.6 98.1 73.2 33.4 9.6 11.4 11.1 Jul01 Baseline RPC rate 282.6 100.7 76.3 35.5 9.3 12.9 11.5 Change in % 0.0 2.6 4.2 6.2 -3.8 12.8 3.6 Old Gap Penetrating 160.7 46.9 24.9 13.7 3.9 4.8 4.3 Jul01 Baseline Penetrating 161.0 48.9 26.3 14.7 3.6 6.2 4.5 Change in % 0.2 4.4 5.7 7.2 -8.9 28.4 4.3