# Crystal channeling of LHC forward protons with preserved distribution in phase space

## TL;DR

This paper demonstrates that bent crystals can effectively trap and steer a broad distribution of protons at the LHC with high precision, enabling improved measurement of very forward protons.

## Contribution

It introduces a novel crystal-based method for trapping and preserving the phase space distribution of protons, enhancing detection efficiency at the LHC.

## Key findings

- 90% trapping efficiency for diffractively scattered protons
- Proton angles preserved with 0.1 microrad accuracy
- Potential for 100-fold efficiency improvement

## Abstract

We show that crystal can trap a broad (x, x', y, y', E) distribution of particles and channel it preserved with a high precision. This sampled-and-hold distribution can be steered by a bent crystal for analysis downstream. In simulations for the 7 TeV Large Hadron Collider, a crystal adapted to the accelerator lattice traps 90% of diffractively scattered protons emerging from the interaction point with a divergence 100 times the critical angle. We set the criterion for crystal adaptation improving efficiency ~100-fold. Proton angles are preserved in crystal transmission with accuracy down to 0.1 microrad. This makes feasible a crystal application for measuring very forward protons at the LHC.

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Source: https://tomesphere.com/paper/0704.0031