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Stuck String Analysis
5 March 2000
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String 17 became "stuck" while being deployed in January. Jim Madsen and I ran some Monte Carlo to get an idea of how the stuck string affects the effective telescope area for 1 TeV and 100 TeV upgoing (-1 < cos(zenith) < 0) muons.
The tables below show the effective telescope area for upgoing muons for trigger level, and for events that reconstruct to within an angle of 3 degrees. The numbers in parenthesis indicate 1 sigma uncertainty.
1 TeV Muons
| Trigger Level | < 3 Deg. Recon. | |
| Ideal (area in m^2) | 87,110 (450) | 37,020 (290) | Stuck (area in m^2) | 83,870 (440) | 34,770 (280) |
| Eff. of Stuck String | -3.7% | -6.1% |
100 TeV Muons
| Trigger Level | < 3 Deg. Recon. | |
| Ideal (area in m^2) | 244,290 (1,730) | 54,810 (820) | Stuck (area in m^2) | 270,300 (1,910) | 52,130 (840) |
| Eff. of Stuck String | +10.6% | -4.9% |
Below are links to plots of the effective telescope area vs. zenith for the cases described above. In the plots, the solid line represents the ideal detector (as if the string had not gotten stuck) and the dashed lines show the effect of the stuck string.
1 TeV, Trigger Level
1tev_trigger.ps
(23374 bytes postscript)
1 TeV, 3 Deg. Recon.
1tev_3deg.ps
(23512 bytes postscript)
100 TeV, Trigger Level
100tev_trigger.ps
(21446 bytes postscript)
100 TeV, 3 Deg. Recon.
100tev_3deg.ps
(23771 bytes postscript)
We assumed no background and that all OM's are analog. We removed from the simulation all OM's from AMANDA b10 which do not work. We also assumed that the OM's in the most recently deployed strings (including the stuck string) work. I should also point out that these results isolate the effect of the "stuck" geometry and do not take into account the fact the the ice is different in the region where the string is stuck. Since the scattering length decreases signficantly above the ideal detector, the numbers shown here should be considered an upper limit for the actual performance. Simulations with the stuck string removed altogether are now complete (see the summary page).
The following are links to the scripts used to generate the 1TeV results:
b19_sim_1TeV.s
b19_sim_1TeV_ama_ideal.s
b19_sim_1TeV_ama_stuck.s
b19_ideal.dat
b19_stuck.dat
b19_ideal.geo
b19_stuck.geo
muo0.cfg
recoos_ideal.s
recoos_stuck.s
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