Three-dimensional measurement of a proton beam profile at KOMAC with a scintillating fiber detector

S. H. Kim, J. W. Lee, W. S. Jung, J. K. Ahn, M. H. Jung, Y. J. Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The time structure of proton beam pulses has been measured using a three-dimensional beam profile monitor (BPM) with scintillating fibers at the Korea Multi-purpose Accelerator Complex (KOMAC). The BPM measured the spatial and temporal distributions of 100-μs-long macropulses at the 20-MeV and 100-MeV proton beamlines. The scintillating fiber BPM covers an effective area of 120(x)×120(y) mm2, with 12 fibers separated by 10 mm in each direction. Signals from 1-mm-diameter fibers were read out with a 1.3×1.3mm2 multi-pixel photon counter (MPPC) and fed into a 500-MHz flash ADC. We successfully measured the beam profile and its time structure at the same time. Using multi-layered collimators, the beam intensity could be sufficiently reduced so that the BPM could measure individual beam particles.

Bibliographical note

Funding Information:
The authors would like to thank the KOMAC staff for an excellent operation of the accelerator. We acknowledge support from the National Research Foundation (NRF) of Korea Grant No. 2016M2B2A4912301 and No. 2020R1A3B2079993 .

Funding Information:
The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: J. K. Ahn reports financial support was provided by National Research Foundation of Korea.

Publisher Copyright:
© 2022 Elsevier B.V.


  • Beam profile monitor
  • Flash ADC
  • Scintillating fiber

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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