CRYSTALS APPLICATION IN THE TOTEM EXPERIMENT TO INCREASE THE ACCEPTANCE OF A ROMAN POT

Bent crystal may enhance the physics reach of a near- beam physics detector in the CERN-LHC, by increasing the acceptance of scattered protons in low transverse mo- mentum reactions. As an example we present simulations demonstrating the increase of the Roman Pot acceptance in the TOTEM apparatus. Starting from the MadX v6.5 collision optics, a crystal is placed at different longitudi- nal and transversal positions: for each scheme a gaussian beam of protons with different kinematic variables is cre- ated and tracked along the optical line with crystal. The number of protons with transversal coordinates greater than 10 σ +0 . 5m m, that is inside the Roman Pot, is compared with the total number of protons. The possible gain in ac- ceptance is around 15 − 20%.