Probe measurements of electron energy spectrum and plasma-wall interaction in Helium/air micro-plasma at atmospheric pressure

Diagnostics of a microhollow cathode discharge at atmospheric pressure

“…Our group has reported on this problem [29]. In addition, a series of papers has also reported on this problem [15,20,22]. According to the literature [29], the plasma generated by the device is non-local and the electron temperature is low.…”

“…The helium is injected into the hole in the middle. Recently, some researchers have suggested that a steady discharge at atmospheric pressure requires an electrode hole diameter less than 0.2 mm [22]. For that reason, a hole with diameter of 0.12 mm was punched by a femtosecond laser (figure 1(b)).…”

“…Demidov et al [20] proposed a sandwich-like structure for an electrode [21], creating a microdischarge of a helium/ air mixture at atmospheric pressure. Although the plasma electron spectroscopy generated by such a device at atmospheric pressure has been diagnosed many times, the diagnostic results are still less satisfactory than those obtained at low pressure [22]. The current theories for probe diagnostics at high pressure have been summarized by Demidov et al Also, a sink parameter has been used to correct the results of probe diagnostics, and the advantages of wall-probe plasma diagnostics at high pressure have been proposed [23,24].…”

Development of diagnostics of electron density and temperature for atmospheric-pressure helium plasma based on optical emission spectroscopy analysis and a collisional-radiative model

“…5) However, there is no reliable method to diagnose the electron density and temperature of atmospheric-pressure helium plasma as effectively as for low-pressure helium plasma. Although some diagnostics of helium plasma at atmospheric pressure, such as probe measurements of the electron energy spectrum and plasma-wall interaction, have been researched in recent years, 6) the determination of the electron density and temperature of atmospheric-pressure helium plasma needs further investigation.…”

Magnetically insulated baffled probe (MIBP) for low-temperature and fusion-boundary plasma studies

“…In the majority of previous studies, unbaffled (cylindrical and spherical) probes have been applied for measuring [3-5, 8, 10, 12, 13] T e , n e , V S and F e (v) in stationary low-pressure (usually less than several Torr) plasma [4,5,8,10,12]. Probe theories have since been expanded to higher pressures, up to and beyond atmospheric pressure [10,[12][13][14][15]. Fast sweeping probes [16][17][18] can respond to plasma evolution and oscillation in time-varying plasmas, allowing measurement time resolution on the order of a fraction of one microsecond.…”