CYCLOTRONS2022 - List of Keywords (site)

Paper	Title	Other Keywords	Page
MOBO03	Proton Irradiation Site for High-Uniformity Radiation Hardness Tests of Silicon Detectors at the Bonn Isochronous Cyclotron	radiation, cyclotron, proton, electron	38
	D. Sauerland, R. Beck, P.D. Eversheim HISKP, Bonn, Germany J. Dingfelder, P. Wolf SiLab, Bonn, Germany
	The Bonn Isochronous Cyclotron provides proton, deuteron, alpha particle and other light ion beams, having a charge-to-mass ratio Q/A >= 1/2, with kinetic energies in the range of 7 to 14 MeV per nucleon. At the irradiation site, a 14 MeV proton beam with a diameter of a few mm is used to irradiate detectors, so-called devices under test (DUTs), housed in a thermally-insulated and gas-cooled box. To ensure homogeneous damage application, the DUT is moved through the beam in a row-wise scan pattern with constant velocity and a row separation, smaller than the beam diameter. During irradiation, beam parameters are continuously measured non-destructively using a calibrated, secondary electron emission-based beam monitor, installed at the exit to the site. This allows a beam-driven irradiation scheme, enabling the setup to autonomously react to changing beam conditions, resulting in highly-uniform proton fluence distributions with relative uncertainties of typically 2%. In this work, the accelerator facility is introduced, the proton irradiation site with focus on its beam diagnostics is presented in detail and resulting fluence distributions are shown.
	Slides MOBO03 [17.472 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOBO03
About •	Received ※ 31 December 2022 — Revised ※ 16 January 2023 — Accepted ※ 01 February 2023 — Issue date ※ 07 February 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THBO05	Commissioning of a 70 MeV Proton Cyclotron System of IBS, Korea	cyclotron, ISOL, controls, MMI	282
	J.-W. Kim, Y.H. Yeon IBS, Daejeon, Republic of Korea
	A 70 MeV H⁻ cyclotron system was installed at the Shindong campus of Institute for Basic Science from Nov. 2021. Installation was guided by precision survey so as to locate main components to their final positions. Electrical cables and utility lines were then connected and validation was followed for the control and safety systems. Internal beams were accelerated in May and utilized to isochronize the magnetic field by Smith-Garren method involving a series of magnetic shimming. A beam of 70 MeV was firstly extracted in July and two beam lines were commissioned for the beam energies of 40-70 MeV. Site acceptance tests were carried out with a temporary beam line installed to measure beam profiles at the location of ISOL target, Finally, a maximum beam power of 50 kW was successfully tested for six hours.
	Slides THBO05 [8.492 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-THBO05
About •	Received ※ 06 December 2022 — Revised ※ 25 January 2023 — Accepted ※ 28 January 2023 — Issue date ※ 08 July 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRBO04	Error Magnetic Field due to the Median Plane Asymmetry and Its Applications in the Cyclotron	survey, cyclotron, resonance, coupling	381
	L.G. Zhang, R.A. Baartman, Y. Bylinskii, T. Planche, Y.-N. Rao TRIUMF, Vancouver, Canada
	Cyclotrons have a median plane symmetric structure. But the pole’s geometric error and the unevenly magnetized soft iron give rise to non-zero asymmetrical fields in the geometric median plane. The asymmetric field can shift the vertical position of the beam. Moreover, The error of the tilted median plane can be the driving force when the tunes pass through coupling resonances. In this paper, we take the TRIUMF 500 MeV cyclotron as an example to study the asymmetric field resulting from imperfect median plane symmetry. An approach due to M. Gordon, and a highly accurate compact finite differentiation method are used to investigate the historical field survey data, which reveals redundancy in the survey data. The redundancy was used in this study to correct the error in the measurement data. Further, the median plane asymmetry field could be manipulated using trim coils or harmonic coils with top and bottom coil currents in opposite directions (’Br-mode’). Using the created asymmetric field, we improved the vertical tune measurement method to investigate the linear coupling resonance in TRIUMF 500 MeV cyclotron. Eventually, the coupling resonance is corrected and avoided using the available harmonic coils and trim coils.
	Slides FRBO04 [1.620 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-FRBO04
About •	Received ※ 29 December 2022 — Revised ※ 07 February 2023 — Accepted ※ 10 February 2023 — Issue date ※ 10 July 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

Proton Irradiation Site for High-Uniformity Radiation Hardness Tests of Silicon Detectors at the Bonn Isochronous Cyclotron

radiation, cyclotron, proton, electron

38

D. Sauerland, R. Beck, P.D. Eversheim
HISKP, Bonn, Germany
J. Dingfelder, P. Wolf
SiLab, Bonn, Germany

The Bonn Isochronous Cyclotron provides proton, deuteron, alpha particle and other light ion beams, having a charge-to-mass ratio Q/A >= 1/2, with kinetic energies in the range of 7 to 14 MeV per nucleon. At the irradiation site, a 14 MeV proton beam with a diameter of a few mm is used to irradiate detectors, so-called devices under test (DUTs), housed in a thermally-insulated and gas-cooled box. To ensure homogeneous damage application, the DUT is moved through the beam in a row-wise scan pattern with constant velocity and a row separation, smaller than the beam diameter. During irradiation, beam parameters are continuously measured non-destructively using a calibrated, secondary electron emission-based beam monitor, installed at the exit to the site. This allows a beam-driven irradiation scheme, enabling the setup to autonomously react to changing beam conditions, resulting in highly-uniform proton fluence distributions with relative uncertainties of typically 2%. In this work, the accelerator facility is introduced, the proton irradiation site with focus on its beam diagnostics is presented in detail and resulting fluence distributions are shown.

Slides MOBO03 [17.472 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-MOBO03

About •

Received ※ 31 December 2022 — Revised ※ 16 January 2023 — Accepted ※ 01 February 2023 — Issue date ※ 07 February 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THBO05

Commissioning of a 70 MeV Proton Cyclotron System of IBS, Korea

cyclotron, ISOL, controls, MMI

282

J.-W. Kim, Y.H. Yeon
IBS, Daejeon, Republic of Korea

A 70 MeV H⁻ cyclotron system was installed at the Shindong campus of Institute for Basic Science from Nov. 2021. Installation was guided by precision survey so as to locate main components to their final positions. Electrical cables and utility lines were then connected and validation was followed for the control and safety systems. Internal beams were accelerated in May and utilized to isochronize the magnetic field by Smith-Garren method involving a series of magnetic shimming. A beam of 70 MeV was firstly extracted in July and two beam lines were commissioned for the beam energies of 40-70 MeV. Site acceptance tests were carried out with a temporary beam line installed to measure beam profiles at the location of ISOL target, Finally, a maximum beam power of 50 kW was successfully tested for six hours.

Slides THBO05 [8.492 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-THBO05

About •

Received ※ 06 December 2022 — Revised ※ 25 January 2023 — Accepted ※ 28 January 2023 — Issue date ※ 08 July 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRBO04

Error Magnetic Field due to the Median Plane Asymmetry and Its Applications in the Cyclotron

survey, cyclotron, resonance, coupling

381

L.G. Zhang, R.A. Baartman, Y. Bylinskii, T. Planche, Y.-N. Rao
TRIUMF, Vancouver, Canada

Cyclotrons have a median plane symmetric structure. But the pole’s geometric error and the unevenly magnetized soft iron give rise to non-zero asymmetrical fields in the geometric median plane. The asymmetric field can shift the vertical position of the beam. Moreover, The error of the tilted median plane can be the driving force when the tunes pass through coupling resonances. In this paper, we take the TRIUMF 500 MeV cyclotron as an example to study the asymmetric field resulting from imperfect median plane symmetry. An approach due to M. Gordon, and a highly accurate compact finite differentiation method are used to investigate the historical field survey data, which reveals redundancy in the survey data. The redundancy was used in this study to correct the error in the measurement data. Further, the median plane asymmetry field could be manipulated using trim coils or harmonic coils with top and bottom coil currents in opposite directions (’Br-mode’). Using the created asymmetric field, we improved the vertical tune measurement method to investigate the linear coupling resonance in TRIUMF 500 MeV cyclotron. Eventually, the coupling resonance is corrected and avoided using the available harmonic coils and trim coils.

Slides FRBO04 [1.620 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-FRBO04

About •

Received ※ 29 December 2022 — Revised ※ 07 February 2023 — Accepted ※ 10 February 2023 — Issue date ※ 10 July 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)