Improvement of the efficiency and beam quality of the TRIUMF Charge State Booster
| dc.contributor.author | Adegun, Adedapo Joseph | |
| dc.contributor.supervisor | Kester, Oliver | |
| dc.contributor.supervisor | Karlen, Dean | |
| dc.date.accessioned | 2023-06-30T22:09:32Z | |
| dc.date.available | 2023-06-30T22:09:32Z | |
| dc.date.copyright | 2023 | en_US |
| dc.date.issued | 2023-06-30 | |
| dc.degree.department | Department of Physics and Astronomy | en_US |
| dc.degree.level | Doctor of Philosophy Ph.D. | en_US |
| dc.description.abstract | At the Isotope Separator and Accelerator (ISAC) facility of TRIUMF, charge state breeding of radioactive isotopes with an atomic mass greater than 30 is required before they are injected into the linear accelerator (LINAC) for post-acceleration to provide the required mass-to-charge ratio (A/Q). A 14.5 GHz Electron Cyclotron Resonance Ion Source (ECRIS) PHOENIX booster developed by Pantechnik is employed for the charge breeding process. On the Charge State Booster (CSB), the two-frequency heating technique was implemented using only a single waveguide, contrary to the conventional implementation using two separate waveguides. In addition, the injection and extraction optics and the injection and extraction systems of the CSB were optimized for the first time. The optimization of the CSB injection optics performed in TRANSOPTR (TRIUMF’s in-house beam transport code) involved modelling of the magnetic field and electric field at the injection of the CSB ECRIS to determine tune settings for the injection of singly charged ions. Moreover, the magnetic field distribution of the source was mapped and the measurement results, when compared with the OPERA© simulation, revealed a discrepancy in the control settings of the power supply of the electron cyclotron resonance ion source’s solenoid coils. The measured magnetic field distribution was finally used to model the beam extraction system using the code IGUN©, which allowed the optimization of the extraction of highly charged ions and the reduction of the beam emittance. The implementation of the two-frequency heating technique provides an additional knob to condition the plasma of the CSB for the production of highly charged ions, while the optimization of the injection and extraction systems as well as the associated beam optics, were necessary to ensure that singly charged ions are efficiently injected into the charge state booster and highly charged ions with higher intensity and best emittance are extracted and delivered to the experiments in the TRIUMF ISAC Facility. The systematic optimizations of the CSB injection and extraction optics and the extraction system along with the implementation of the two-frequency heating resulted in a significant increase in the maximum charge state of cesium that can be produced, shifting it from 28+ to 32+. The global efficiency between 20+ and 32+ also increased to 41.1%, while the peak of the efficiency distribution shifted to 26+ with an efficiency of 9.1%. Additionally, the emittance of the total current extracted from the CSB decreased by a factor of 2. | en_US |
| dc.description.scholarlevel | Graduate | en_US |
| dc.identifier.uri | http://hdl.handle.net/1828/15171 | |
| dc.language | English | eng |
| dc.language.iso | en | en_US |
| dc.rights | Available to the World Wide Web | en_US |
| dc.subject | ECRIS | en_US |
| dc.subject | Beam dynamics | en_US |
| dc.subject | Plasma physics | en_US |
| dc.subject | Charge state booster | en_US |
| dc.subject | Ion sources | en_US |
| dc.subject | Accelerator physics | en_US |
| dc.subject | Beam optics | en_US |
| dc.title | Improvement of the efficiency and beam quality of the TRIUMF Charge State Booster | en_US |
| dc.type | Thesis | en_US |