RF probe

RF probe

Introduction to Magnetic Resonance Imaging

Published in Jianming Jin, in Magnetic Resonance Imaging, 2018

The RF coil, also known as an RF resonator or RF probe, is responsive to frequencies in the general band defined by the Larmor frequency of interest. It is desirable for the FOV of the coil to be filled by the sample and little else so that no unnecessary noise is introduced into the received signal, or equivalently, so that little power is wasted from the transmitter. This often requires that the probe have dimensions comparable to the sample. For sample sizes much smaller than the corresponding wavelength, a solenoidal coil may be an efficient resonator. This is usually the case in spectroscopic experiments.

Development of Bunching System for High Intensity Cyclotron at CIAE

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Journal Information

Published in Journal of Nuclear Science and Technology, 2022

Pengzhan Li, Tianjue Zhang, Xianlu Jia, Bin Ji, Guofang Song, Ming Li, Junyi Wei

The open-loop buncher system is tested in air environment after the buncher is assembled (Figure 4). The RF probe, connected to the oscilloscope, is placed on the central electrode of the buncher to indicate the bunching voltage. About 3 pF parasitic capacitance due to the probe is introduced in this configuration’ therefore', the matching circuit should be tuned again to get a resonance frequency of 70.5 MHz and input impedance of 50 Ω when the probe is settled down. A circulator is added between the amplifier and the matching circuit to protect the amplifier from reverse power. The open-loop bench test shows that 370 Vpeak is established on the central electrode of the buncher, and the corresponding RF power consumption is 37 W.

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Introduction to Magnetic Resonance Imaging

Development of Bunching System for High Intensity Cyclotron at CIAE