Olivier Shelbaya

Beam Physicist

TRIUMF Beam Physics Dept.

Vancouver, BC

Beam optics and envelope modeling of linear accelerators and beamlines. Investigation of model-coupled accelerator tuning with TRANSOPTR at ISAC-I.

Interactive envelope simulations showcased at demo.envelope.triumf.ca

Machine Development Record

Finding of persistent temperature-transmission correlations at TRIUMF-ISAC (2017)

White paper on need for an indexed beam database (2019)

DTL investigation finds no machine problems - doesn't explain need for manual DTL quadrupole tuning (2019)

Finding of anomalous OLIS beam delivery tunes and misplaced IOS:Q2 (2019)

Development of a new sequential optimization method in TRANSOPTR, computing full ISAC tunes from first principles (2020)

White paper on need for regular machine development (2021)

Finding that the bunch rotator (with old P/S) overfocuses longitudinally for low A/q beams (2021)

Finding of misplaced IOS:Q5 and transmission consequences (2022)

TRANSOPTR IMS line optics checks (2022)

On-line establishment of DTL TRANSOPTR model tune (2022)

MCAT based DTL tuning (2022)

MEBT mismatches into DTL (2022)

Structure of ISAC machine development shifts (2023)

Multiple different OLIS tunes, with different properties, in use by different groups (2023)

Finding of achromaticity in the HEBT2 and HEBT3 lines (2023)

TRANSOPTR model based IMS to Polarizer tuning (2023)

Evidence of steerer lensing effects at OLIS (2024)

Matching improvement for RIB transport by lowering steering voltage at ISAC (2024)

Sign error in IMS emittance rig correlations for both horizontal and vertical planes identified (2024)

Peer-reviewed publications:

Shelbaya, O., Baarsstman, R., Braun, P., Jung, P. M., Kester, O., Planche, T., Podlech, H., Rädel, S. D. (2024). Tuning methods for multigap drift tube linacs. Review of Scientific Instruments, 1 March 2024; 95 (3): 033302.

Shelbaya, O., Angus, T., Baartman, R., Jung, P. M., Kester, O., Kiy, S., Planche, T. & Rädel, S. D. (2021). Autofocusing drift tube linac envelopes. Physical Review Accelerators and Beams, 24(12), 124602.

Shelbaya, O., Baartman, R., & Kester, O. (2019). Fast radio frequency quadrupole envelope computation for model based beam tuning. Physical Review Accelerators and Beams, 22(11), 114602.

Shelbaya, O., & Kester, O. K. (2018, September). Toward an End-to-End Model for ISAC-I Accelerators. In Journal of Physics: Conference Series (Vol. 1067, No. 6, p. 062028). IOP Publishing.

Conference proceedings:

Katrusiak, A., Shelbaya, O., Baartman, R., Kester, O., Ruiz, C.. Autofocusing accelerator beams, in Proc. IPAC'24, Nashville, TN, USA, May 2024, pp. 3473-3476. doi:https://doi.org/10.18429/JACoW-IPAC2024-THPG87

Ghelfi, E., Katrusiak, A., Kester, O., Shelbaya, O., Baartman, R., Fedorko, W. Bayesian optimization for beam centroid correction at ISAC, in Proc. IPAC'24, Nashville, TN, USA, May 2024, pp. 1786-1789. doi:https://doi.org/10.18429/JACoW-IPAC2024-TUPS54

O. Shelbaya et al., “Model Coupled Accelerator Tuning With an Envelope Code”, in Proc. LINAC'22, Liverpool, UK, August 2022, pp. 554-556. doi:10.18429/JACoW-LINAC2022-TUPORI03

O. Shelbaya et al., “On-Line Retuning of ISAC Linac Beam with Quadrupole Scan Tomography”, in Proc. IPAC'21, Campinas, SP, Brazil, May 2021, pp. 4187-4189. doi:10.18429/JACoW-IPAC2021-THPAB205

O. Shelbaya, R.A. Baartman, and O.K. Kester, “End-to-End RMS Envelope Model of the ISAC-I Linac”, in Proc. IPAC'21, Campinas, SP, Brazil, May 2021, pp. 4183-4186. doi:10.18429/JACoW-IPAC2021-THPAB204

Shelbaya, O., Baartman, R., Kester, O., & Kiy, S. (2019, May). Toward Autonomous Phasing of ISAC Heavy Ion LINACs. In 10th Int. Particle Accelerator Conf.(IPAC'19), Melbourne, Australia, 19-24 May 2019 (pp. 3827-3830). JACOW Publishing, Geneva, Switzerland.

Thesis/Dissertation

Model coupled accelerator tuning, Ph.D. dissertation, University of Victoria, 2023. Supervisors: O. Kester & D. Karlen.

Laser spectroscopy of rare Rubidium isotopes and development of data analysis software at TRIUMF, M.Sc. thesis, McGill University, 2012. Supervisors: F. Buchinger & M. Pearson.

Technical reports:

See lin12.triumf.ca beam physics repository

ECAS Reports/Tuning Time:

Autogenerated weekly ECAS reports

TRI-BN-20-09/Element Command Automated Summary Tool