Long-Duration Energy Storage Is Key To Cleaning Up The Power Grid
you may come across terms like long-term storage, seasonal storage, diurnal storage, or long-duration storage. Long-term storage can include seasonal energy storage, which can shift delivery of power to a different time of year. Diurnal storage can shift power delivery over a few days. And, long-duration storage is particularly important for the power grid’s transformation to clean energy and what I’m focusing on here.refers to the amount of time a power system can discharge electricity.
Long-duration storage could also offer greater grid flexibility because it can store large amounts of energy. A long-duration storage system can charge when electricity demand is low and discharge later when it is most needed. When transmission systems need costly upgrades, energy storage can be deployed to help with these services instead. Longer duration systems can further extend the life of transmission equipment by operating more frequently and for longer periods.
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Excitation and probing of low-energy nuclear states at high-energy storage rings$^{229}\mathrm{Th}$ with a low-lying nuclear isomeric state is an essential candidate for a nuclear clock as well as many other applications. Laser excitation of the isomeric state has been a long-standing goal. With relativistic $^{229}\mathrm{Th}$ ions in storage rings, high-power lasers with wavelengths in the visible range or longer can be used to achieve high excitation rates of $^{229}\mathrm{Th}$ isomers. This can be realized through direct resonant excitation or excitation via an intermediate nuclear or electronic state, facilitated by the tunability of both the laser-beam and ion-bunch parameters. Unique opportunities are offered by highly charged $^{229}\mathrm{Th}$ ions due to the nuclear-state mixing. The significantly reduced isomeric-state lifetime corresponds to a much higher excitation rate for direct resonant excitation. Importantly, we propose electric dipole transitions changing both the electronic and nuclear states that are opened by the nuclear hyperfine mixing. We suggest using them for efficient isomer excitation in Li-like $^{229}\mathrm{Th}$ ions, via stimulated Raman adiabatic passage or single-laser excitation. We also propose schemes for probing the isomers, utilizing nuclear radiative decay or laser spectroscopy on electronic transitions, through which the isomeric-state energy can be determined with an orders-of-magnitude higher precision than the current value. The schemes proposed here for $^{229}\mathrm{Th}$ could also be adapted to low-energy nuclear states in other nuclei, such as $^{229}\mathrm{Pa}$.
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