Probing Channeling Radiation Influenced by Ultrasound

Channeling and Radiation in Periodically Bent Crystals

“…As a result, in [87,133] the attention was paid not to the UR (the intensity of which is negligibly small in the low-amplitude regime, see Sect. Similar studies were carried out in [10,116,219,220,291,292]. Similar studies were carried out in [10,116,219,220,291,292].…”

“…Therefore, the main focus of [69,87,133,220], (as well as that of [10,219,291,292] where the propagation of longitudinal ultrasonic waves through a crystal was considered) was on various aspects of the influence of the additional undulator-type oscillations of the particles on the spectrum of ChR rather than on the properties of CU and of its radiation.…”

“…Moreover, in the limit a ≤ d the UR becomes less intensive than the background bremsstrahlung radiation [183,158]. In the papers [10,87,116,219,220] (see also [291,292] and references therein) the parametric resonance enhancement of ChR emitted by positrons in the presence of either transverse or longitudinal supersonic wave was considered. Indeed, for a ≤ d and by a proper choice of the parameter C it is possible to make the CUR frequency ω u comparable or equal to that of ChR ω ch , see (4.6).…”

“…The channeling experiments accompanied by the transmission of ultrasonic waves in piezoelectric crystals (see [291,292] and the references therein) suggest that this is also a realistic method to construct a CU, which is, although, still to be realized. From this end, Fig.…”

“…4.14 allows one to estimate the frequencies ν of the transverse AW to be transmitted through the crystal to achieve the periodic bending. The values λ u ∼10-10 2 µm range correspond bending amplitude a (cm) to the frequencies within the 0.1-1 GHz range, which seems to be achievable [291,292]. The values λ u ∼10-10 2 µm range correspond bending amplitude a (cm) to the frequencies within the 0.1-1 GHz range, which seems to be achievable [291,292].…”