Input file formats

FLUKA - V. Talanov

Each event corresponds to one proton lost at IP1 by beam 1 on the TCTH. The decay products of the inelastic proton-collision with the TCTH were projected along the beam-line to the scoring-plane using the FLUKA simulation. Only particles which reach the scoring plane at 23 m from the centre of IP1 are included in the output file. The output of the FLUKA simulation contains rows of:

				Position at scoring plane
Event ID	Particle ID	Particle Generation Number	KE	X	Y	Z	Dc_X	Dc_Y	Dc_Z

where Particle ID is the Fluka particle id, KE is the relativistic Kinetic Energy in natural units (GeV), { X, Y, Z } are the particle positions at the scoring plane (cm), and { Dc_X, Dc_Y, Dc_Z } are the direction cosines.

The input file tcth.4l1.b1_lowb.coll_hor_b1.gz should be downloaded and unzipped before running the generator. The missing event numbers correspond to events where the decay products did not reach the scoring plane. The file was made from around 1230120 inelastic TCTH collisions and contains 402719 events where the showers from the proton TCTH collision reached the scoring plane. The nominal loss maps for design luminosity of the LHC were used.

Possible Improvements

• There are two pairs of tertiary collimators at IP1. Each station has a TCTH and TCTV. The TCTH is upstream of IP1 and therefore contributes to a greater extent. Both beams can collide with each of the TCT components and there are therefore 8 loss maps. Ideally the simulation should include the collimator background using each of them and then make some assumption on the superposition of the resulting estimates.
• No affects of inelastic beam-gas interactions over several orbits or inelastic beam-gas interactions were included in this simulation.

MARS - N. Mokhov