Page 13 - Demo

350 C, thus it could be optional to remove a representative sample, allow to quench and apply X-ray diffraction. This approach however is known to alter the liquid-structure [48], therefore, in-situ diagnostics of the molten salt is thus preferable [49].
In order for the transmutator to operate in the subcritical regime, real-time spatial and temporal monitoring is paramount. Passive spectroscopy as well as active spectroscopy such as CAN laser spectroscopy and gamma-spectroscopy [36] are important features allowing the real- time knowledge of the TRU, FP and FLiBe chemical and isotopic concentrations.
The Coherent Amplification Network (CAN) [35] laser, shown in Fig. 5, is a bundle of a large number of laser fibers that are optically coherently interfered as a whole. The adoption of fiber lasers allows us the high efficiency and ease in straightforward increase to the needed ultimate power of the transmutator driver as a whole. These fibers are optically controlled in such a way as to maintain its phase, amplitude, etc. with other fibers in real time through a feedback circuit. Because of this construct, CAN laser has several features that are important to the purpose of the transmutator monitoring. First, because it is based on the fiber laser technology, its efficiency is high (on the order of 30%). Second, because its power (or energy) is linearly proportional to the number of the fibers, we can produce a large power (or energy) system. Third, since each fiber is controlled including its subcyclic phase with other fibers by the feedback control loop, we can control its properties such as the phase, frequency, amplitude duration, etc. in real-time. In some cases, while within one bundle the above features are built in, in another bundle it may take a different crystal material so that their frequency component (and other parameters) may be distinct from the former bundle. If we take such a construct, it allows additional varied adaptability to the broad demand to monitor different areas or different physical conditions of parts of the tank.