Investigation of Nonthermal Plasma Jet Excitation Mode and Optical Assessment of Its Electron Concentration

Round 1

Reviewer 1 Report

The results of the study of the plasma jet at atmospheric pressure helium driven by a capacitive discharge using different modes of excitation are presented in this paper. An automated digital holographic interferometry complex developed for the observation and study of a nonthermal plasma jet generated in a pulsed mode is proposed and described. The authors estimated the peak electron concentration at 0.9·10^16 cm-3.

 

Generally, the quality of this paper seems to be a quite good, including quality of figures. The subject is quite interesting for scientists.

 

I have the following comments:

1. Generally, the authors should focus on improving the description of the article to make it less chaotic;
2. The title of the manuscript uses the term "…electron concentration". This is omitted in the abstract;
3. Throughout the text, spaces between the numeric values and "°C" should be removed;
4. Figure 6 shows the three-channel plasma jet. Similarly to Figure 1, the Authors should add a sketch of this device (e.g. as Figure 1b);
5. The English language should be carefully checked.

Author Response

Dear Editor and Reviewer,

Thank you very much for the essential comments and remarks regarding our article!

Please see the attachment.

Author Response File: Author Response.docx

Reviewer 2 Report

The work of Ivankov et al. presents interesting plasma diagnostics of a atmospheric pressure helium driven by a capacitive discharge using different modes of excitation. For this, the authors used the digital holographic interferometry technique. In general the subject is of interest of Plasma MDPI journal, however the presentation of the paper needs to be improved for its subsequent acceptance. Some points are addressed: (1) The abstract is not organized in a readable structure, ie main objective, experimental and main observed results, please improve; (2) The introduction does not present at the end the novelty of the present work, as well as its main objective; (3) Please insert a picture os the experimental device in Fig. 1; (4) Please insert the degree in C in the temperature axis of Fig. 3; (5) Please name the two axis of Fig. 4; (6) Please insert a scale in Fig. 5. In addition, Figs. 5 and 6 can be merged; (7) The presentation of topic 3.1 fits well with the topic “Materials and Methods”; (8) If possible, it is interesting to insert a scale in Figs. 8 and 9; (9) The topic 4 is only "Discussion" and topic 5 only "Conclusion". Still on the topic 4, please improve the discussions, there is no citations or correlations of the results with related literature.

Author Response

Dear Editor and Reviewer,

Thank you very much for the essential comments and remarks regarding our article!

Please see the attachment.

Author Response File: Author Response.docx

Round 2

Reviewer 2 Report

The authors performed the improvements in the paper, so it is recommended that it be published in its current form.