24pD09p
低エネルギー大気圧プラズマフレアー中のストリエーション現象の発光分光
計測
Optical Emission Spectroscopic Measurements of Striation Phenomena in Low
Energy Atmospheric Pressure Plasma
山田大将1,2、堀田朋敬2、榊田創1,2、藤原大1,2、金載浩2、池原譲2,3、藤原正純2、加藤進2、板垣宏知2、木山學2、池原早苗3、中西速夫4、清水伸幸5
Hiromasa Yamada1, 2, Hajime Sakakita1, 2, Yutaka Fujiwara1, 2, Yuzuru Ikehara2,3, Jaeho Kim2,
Satoru Kiyama2, Susumu Kato2, Masanori Fujiwara2, Hirotomo Itagaki2, Tomonori Hotta1, 2, Hayao
Nakanishi4, and Nobuyuki Shimizu5
筑波大院システム情報, 2産総研電子光技術, 3産総研創薬基盤、4愛知県がんセンター,5国際医療福祉大学（山王病院）
1
Graduate School of Systems and Information Engineering at the University of Tsukuba,2Innovative
Plasma Processing Group, Electronics and Photonics Research Institute, AIST, 3Biotechnology
Research Institute for Drug Discovery, AIST,4Division of Oncological Pathology, Aichi Cancer
Center Research Institute, 5International University of Health and Welfare (SANNO Hospital).
1

1. Introduction
Plasma technology has been used in many fields
such as the removal of environmental pollutants,
combustion assistance, surface modifications, andmedical applications, and is still developing
actively. There are many unknown phenomena inthose application processes, although it isconsidered that reactive species play an importantrole. In the blood coagulation by low energy
atmospheric pressure plasma (LEAPP) equipment1),
minimally invasive treatment without tissue damage
was performed, which was substantially different
from the conventional hemostasis methods.2)
However, detail mechanism of blood coagulation
with LEAPP has not been understood.
Recently, the striation phenomena in theemission of LEAPP using neon gas were found by
Fujiwara et al.3). There is a possibility that thisphenomena are related to the spatiotemporalvariation of the electric field, and plasma
parameters. In this study, to understand thisphenomena, the plasma emission was measured by
an optical emission spectroscopy.
2. Experimental setup
A plasma source based on a dielectric barrierdischarge has been used as LEAPP. The
peak-to-peak voltage applied to the electrode was~6 kV and the frequency of the sinusoidal wave
was about 61 kHz. Neon gas was used as a working
gas for production of plasma. The plasma emission
was measured by a spectrometer. Schematic
diagram of the experimental setup was shown inFig. 1. A copper target plate was set at 10 mm fromthe nozzle exit, and it was treated by LEAPP.

Fig. 1. Schematic diagram of the experimental setup.
3. Experimental results
As a result, strong emissions of Ne I and weakemissions of N2* and N+ were observed.
Furthermore, the spatial distribution of emission
intensity of Ne I shows almost the same interval as
the striation pattern. In the conference, results suchas spatial distributions of excitation temperatureand gas temperature and so on will be presented.
Acknowledgements
This work was supported by Grants-in-Aid for
Scientific Research on Priority Area (24108006)
from the Ministry of Education, Culture, Sports,
Science and Technology of Japan.
References[1] H. Sakakita, Y. Ikehara, and S. Kiyama:
WO2012/005132.
[2] Y. Ikehara, sH. Sakakita, N. Shimizu, S. ikehara,and H. Nakanishi: J. Photopolymer Sci. Tech. 26(2013) 555.
[3] Y. Fujiwara, H. Sakakita, H. Yamada, H. Itagaki,
S. Kiyama, M. Fujiwara, Y. Ikehara, and J. Kim. (tobe published in JJAP Rapid Communications)