In this work, a MOGA optimization would be considered to evaluate candidate scenario strengths, and would be considered in the design to study and optimize the complicated phase-space relationships in regard to the spatial, temporal, momentum, and/or polarization optimization with respect to radiator configuration. While not all candidates may practically be explored this way, the MOGA approach is a powerful utility for the conceptual design to proceed pragmatically and would be used when relevant to distill optimal specifications, from a clearly broad set of “parent” parameters: Electron Drive Beam (energy, intensity, radiation, polarization) Single- & Double-Targets (bremsstrahlung and e+/e- converters) Electron Beam Power (radiation, activation, thermal management) Positron Collection (adiabatic matching, acceleration, optics) Experiment of Polarized Positron CW Source The components of the positron source experiment are described here… Risk mitigation Admittedly, the parameters of our proposal are fairly aggressive. This is mainly caused by our preliminary choice of producing positrons cleanly at 10 MeV. However, there is always an option of increasing the energy thereby increasing the positron production efficiency. A higher-energy scheme would use the same basic components as the 10 MeV scheme. Suppose the multi-turn injection of the accumulator ring allows for only 100 turns. Since we would like to keep the duty factor low for injection into the electron collider ring, the average current would drop by a factor of 10. We could recover the factor of 10 by increasing the electron energy to 100 MeV as illustrated in Fig. 10. All of the studies completed for 10 MeV would still be applicable. Figure 10. Positron production scheme using 100 MeV electron driver. Specific Location of Work The work will be performed at Jefferson Lab. We imagine testing the photogun at the UITF, and will explore both UITF and LERF as options for the positron source test. The final pre-conceptual design will not be constrained to either particularly. We will explore collaboration with Niowave
In this work, a MOGA optimization would be considered to evaluate candidate scenario strengths, and would be considered in the design to study and optimize the complicated phase-space relationships in regard to the spatial, temporal, momentum, and/or polarization optimization with respect to radiator configuration. While not all candidates may practically be explored this way, the MOGA approach is a powerful utility for the conceptual design to proceed pragmatically and would be used when relevant to distill optimal specifications, from a clearly broad set of “parent” parameters: Electron Drive Beam (energy, intensity, radiation, polarization) Single- & Double-Targets (bremsstrahlung and e+/e- converters) Electron Beam Power (radiation, activation, thermal management) Positron Collection (adiabatic matching, acceleration, optics) Experiment of Polarized Positron CW Source The components of the positron source experiment are described here… Risk mitigation Admittedly, the parameters of our proposal are fairly aggressive. This is mainly caused by our preliminary choice of producing positrons cleanly at 10 MeV. However, there is always an option of increasing the energy thereby increasing the positron production efficiency. A higher-energy scheme would use the same basic components as the 10 MeV scheme. Suppose the multi-turn injection of the accumulator ring allows for only 100 turns. Since we would like to keep the duty factor low for injection into the electron collider ring, the average current would drop by a factor of 10. We could recover the factor of 10 by increasing the electron energy to 100 MeV as illustrated in Fig. 10. All of the studies completed for 10 MeV would still be applicable. Figure 10. Positron production scheme using 100 MeV electron driver. Specific Location of Work The work will be performed at Jefferson Lab. We imagine testing the photogun at the UITF, and will explore both UITF and LERF as options for the positron source test. The final pre-conceptual design will not be constrained to either particularly. We will explore collaboration with Niowave