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Area of Science:

  • Particle Accelerator Physics
  • Beam Dynamics
  • Control Systems Engineering

Background:

  • High corrector magnet strength was required for closed orbit distortion (COD) correction in the Indus-2 storage ring.
  • Beam position monitor (BPM) readout offsets were found to limit the achievable COD correction.
  • Accurate COD correction is crucial for efficient particle accelerator operation.

Purpose of the Study:

  • To investigate the impact of BPM offsets on COD correction.
  • To implement a beam-based alignment (BBA) method to estimate and correct BPM offsets.
  • To minimize COD in the Indus-2 storage ring through improved alignment and control.

Main Methods:

  • Beam-based alignment (BBA) was employed to determine the electrical center offsets of BPMs relative to quadrupole magnetic centers.
  • An active shunt power supply (ASPS) system was designed and implemented for individual quadrupole magnet control.
  • COD was measured before and after the BBA procedure and ASPS implementation.

Main Results:

  • Initial COD correction achieved 1.3 mm rms (horizontal) and 0.43 mm rms (vertical).
  • After BBA and ASPS implementation, COD was significantly reduced to 0.45 mm rms (horizontal) and 0.2 mm rms (vertical).
  • The ASPS system demonstrated efficient control for individual quadrupole magnets.

Conclusions:

  • BPM offsets are a significant factor affecting COD correction accuracy in particle accelerators.
  • The BBA method effectively estimates and compensates for BPM offsets.
  • The developed ASPS and BBA methodology successfully minimized COD, enhancing accelerator performance.