Ionization Profile Monitors for the IOTA Storage Ring at Fermilab

Abstract

Ionization profile monitors (IPM) are used in many accelerator laboratories around the world for non-destructive profile measurements of high-energy particle beams. They have been used in nearly all the synchrotrons built at Fermilab and are presently used in the Main Injector (MI), Recycler (RR), and Booster. This paper will present the current status of the design of a new pair of IPMs to be installed in the Integrable Optics Test Accelerator (IOTA), an experimental proton storage ring with a beam energy of 2.5 MeV. The design incorporates aspects of several IPMs previously or currently used at FNAL. Similar to the Booster IPM, ions are collected rather than electrons, thus requiring no external magnetic field. To increase the signal, each IPM uses two microchannel plates in the chevron configuration as is done in the MI/RR IPMs, and due to the ring's ultrahigh vacuum conditions, the local vacuum pressure is increased with a calibrated leak, akin to the former Tevatron IPMs, to increase the ionization yield per bunch. Data acquisition includes upgraded preamplifiers and leveraging of the digitizer design of the beam position monitor system already in use at IOTA. In addition to the mechanical and electronic designs, simulation results of the effects of the electric fields and injected gas on the circulating beam will also be presented.

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BibTeX RIS

BibTeX

@misc{thurmankeup2026ionization,
  title = {{Ionization Profile Monitors for the IOTA Storage Ring at Fermilab}},
  author = {R. Thurman-Keup and N. Banerjee and M. Bressler and K. Carlson and D. Edstrom and B. Fellenz and M. Mwaniki and H. Piekarz and A. Romanov and A. Semenov and V. Shiltsev},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.17022},
  eprint = {2609.17022},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.17022},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Ionization Profile Monitors for the IOTA Storage Ring at Fermilab
AU  - R. Thurman-Keup
AU  - N. Banerjee
AU  - M. Bressler
AU  - K. Carlson
AU  - D. Edstrom
AU  - B. Fellenz
AU  - M. Mwaniki
AU  - H. Piekarz
AU  - A. Romanov
AU  - A. Semenov
AU  - V. Shiltsev
PY  - 2026
DA  - 2026/09/15
PB  - arXiv
DO  - 10.48550/arxiv.2609.17022
UR  - https://arxiv.org/abs/2609.17022
AB  - Ionization profile monitors (IPM) are used in many accelerator laboratories around the world for non-destructive profile measurements of high-energy particle beams. They have been used in nearly all the synchrotrons built at Fermilab and are presently used in the Main Injector (MI), Recycler (RR), and Booster. This paper will present the current status of the design of a new pair of IPMs to be installed in the Integrable Optics Test Accelerator (IOTA), an experimental proton storage ring with a beam energy of 2.5 MeV. The design incorporates aspects of several IPMs previously or currently used at FNAL. Similar to the Booster IPM, ions are collected rather than electrons, thus requiring no external magnetic field. To increase the signal, each IPM uses two microchannel plates in the chevron configuration as is done in the MI/RR IPMs, and due to the ring's ultrahigh vacuum conditions, the local vacuum pressure is increased with a calibrated leak, akin to the former Tevatron IPMs, to increase the ionization yield per bunch. Data acquisition includes upgraded preamplifiers and leveraging of the digitizer design of the beam position monitor system already in use at IOTA. In addition to the mechanical and electronic designs, simulation results of the effects of the electric fields and injected gas on the circulating beam will also be presented.
ER  -

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