Fig. 132: a) Calculated reflection and transmission curves R and T of the cavity against energy deviation from the centre of the Bragg reflection. The monochromator delivers a similar curve to R. Thus the calculated curve for the simulation of an energy scan is the convolution T*R. Experimental data is consistent with theory for anomalous absorption, resulting in the asymmetry around the Bragg position. b) Time pattern of stored photons at the exit of the cavity at the minimum intensity of the Bragg reflection a). Without the crystal in the beam, only a direct bunch of photons is observed at time 0 while many bunches, originating from multiple back and forth journeys inside the device, appear when the cavity is in Bragg condition.

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