Crystal Channeling and Beam Manipulation in High-Energy Accelerators

Crystal channeling exploits the regular atomic structure of single crystals to guide charged particles along crystallographic planes or axes, enabling precise steering, focusing and collimation of beams in high-energy accelerators. When a particle enters a crystal at a small angle to a lattice plane, it becomes confined by the collective electric field of the neighbouring atoms and travels with reduced scattering and energy loss. By shaping the crystal—bending it or varying its thickness—researchers can deflect halo particles away from the core beam, concentrate beamlets to micrometre scales or induce spin rotations for fundamental physics measurements. Such techniques have been demonstrated at CERN’s SPS and LHC, where bent silicon crystals have acted as primary collimators, decreasing background levels in detectors and improving operational efficiency compared with amorphous absorbers. Beyond collimation, channeling devices can enhance slow extraction, facilitate precision spectroscopy of short-lived baryons and offer compact beam optics that complement magnetic systems. Advances in simulation and fabrication have deepened understanding of dechanneling mechanisms, beam divergence effects and optimal bending radii, paving the way for crystal-assisted beam manipulation in future accelerators and beamlines worldwide.

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Crystal Channeling and Beam Manipulation in High-Energy Accelerators publication trend

The graph below shows the total number of articles in crystal channeling and beam manipulation in high-energy accelerators across all publications each year (not limited to Nature Index journals).

Technical terms

Crystal channeling: The process by which charged particles are confined and guided by the electric fields between crystal planes or axes, reducing scattering and deflection.

Bent crystal: A single crystal mechanically curved to introduce a controlled angular deflection of channeled particles according to its bending radius.

Beam halo: A low-density fringe of particles surrounding the main beam core, often responsible for unwanted background and material activation.

Collimation: The removal or redirection of stray particles from the beam periphery to protect equipment and improve beam quality.

Dechanneling: The process by which particles leave the channelled state due to scattering or misalignment, leading to increased energy loss and angular spread.

References

1. Ionization loss spectra of high-energy protons in an oriented crystal at various incidence angles with respect to a crystalline plane. European Physical Journal C (2024).
2. Reducing Beam-Related Background on Forward Physics Detectors Using Crystal Collimation at the Large Hadron Collider*. Physical Review Applied (2020).
3. Comprehensive study of beam focusing by crystal devices. Physical Review Accelerators and Beams (2018).
4. Septum shadowing by means of a bent crystal to reduce slow extraction beam loss. Physical Review Accelerators and Beams (2019).
5. The possibility to measure the magnetic moments of short-lived particles (charm and beauty baryons) at LHC and FCC energies using the phenomenon of spin rotation in crystals. Physics Letters B (2016).
6. Observation of focusing of 400 GeV/c proton beam with the help of bent crystals. Physics Letters B (2014).
7. Strong reduction of the off-momentum halo in crystal assisted collimation of the SPS beam. Physics Letters B (2012).