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Electron gun jitter effects on beam bunching.

M S Liu1, M Iqbal1

  • 1Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.

The Review of Scientific Instruments
|March 6, 2014
PubMed
Summary

Beijing Electron Positron Collider II (BEPCII) linac operation is sensitive to beam bunching. Gun timing jitter significantly impacts beam energy more than voltage jitter, affecting performance and injection rates.

Area of Science:

  • Particle accelerators
  • Beam physics
  • High-energy physics instrumentation

Background:

  • The Beijing Electron Positron Collider II (BEPCII) linac is crucial for particle physics experiments.
  • Stable beam bunching is essential for efficient collider operation and data acquisition.
  • Various factors, including electronic jitter, can disrupt the beam bunching process.

Purpose of the Study:

  • To quantitatively measure and analyze the impact of gun timing jitter and gun high voltage jitter on the BEPCII linac.
  • To determine the relative effects of these jitters on beam energy and overall performance.
  • To identify critical jitter thresholds that degrade beam quality and injection rates.

Main Methods:

  • Utilized precise measurement techniques to quantify gun timing jitter and gun high voltage jitter.

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  • Measured beam energy at the exit of the standard acceleration section.
  • Performed analytical comparisons to assess the differential impact of timing versus voltage jitter.

    • Main Results:

    • Measured gun high voltage jitter up to 80 mV and timing jitter exceeding 200 ps.
    • Analysis revealed that gun timing jitter has a more severe effect on beam energy compared to gun high voltage jitter.
    • A timing jitter threshold of 100 ps was identified as critical for performance degradation.

    Conclusions:

    • Gun timing jitter is a primary concern for maintaining optimal BEPCII linac performance.
    • Exceeding the 100 ps timing jitter threshold significantly deteriorates beam performance and storage ring injection rates.
    • Mitigating gun timing jitter is essential for the routine operation and efficiency of the BEPCII collider.