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Related Experiment Videos

Emittance growth during bunch compression in the CTF-II

Braun1, Chautard, Corsini

  • 1PS Division, CERN, Geneva, Switzerland.

Physical Review Letters
|October 4, 2000
PubMed
Summary

Beam emittance increases significantly during bunch compression in the CLIC Test Facility (CTF-II), peaking at full compression. Coherent synchrotron radiation is identified as the primary cause of this emittance dilution.

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Area of Science:

  • Particle accelerator physics
  • High-energy physics
  • Beam dynamics

Background:

  • The Compact Linear Collider (CLIC) aims for high luminosity, requiring precise control over particle beams.
  • Beam emittance, a measure of beam quality, is crucial for accelerator performance and must be preserved during acceleration and manipulation.
  • Bunch compression is a key process in linear colliders to increase particle density, but it can lead to emittance growth.

Purpose of the Study:

  • To experimentally measure beam emittance evolution during bunch compression in the CLIC Test Facility (CTF-II).
  • To investigate the impact of varying beam charge and energy spread on emittance during compression.
  • To identify the dominant mechanism responsible for emittance dilution in this process.

Main Methods:

Related Experiment Videos

  • Utilized the CLIC Test Facility (CTF-II) for controlled beam manipulation experiments.
  • Performed systematic measurements of beam emittance across a range of bunch compressor settings, from under-compression to over-compression.
  • Varied beam charge and energy correlations to assess their influence on emittance growth.

Main Results:

  • Observed significant increases in beam emittance as bunch compression progressed.
  • Found that maximum beam emittance occurred near the point of full (maximal) compression.
  • Emittance growth was correlated with specific bunch compressor settings and beam parameters.

Conclusions:

  • Coherent synchrotron radiation (CSR) is identified as the most probable cause for the observed beam emittance dilution.
  • Understanding and mitigating CSR effects is critical for preserving beam quality in future linear colliders like CLIC.
  • These findings provide valuable experimental data for validating beam dynamics simulations and optimizing accelerator designs.