Donggyu Jang

8 Questions 18 Answers 0 Followers

Questions related from Donggyu Jang

Why does ICP (Inductively Coupled Plasma) has higher power efficiency for lower frequency operation?

Hello. I'm studying ICP (Inductively Coupled Plasma) and reading famous paper, "Plasma Sources Sci. Techno.l. 1 (1992) 179-186, "A simple analysis of an inductive RF discharge", R B Piejak, V A...

25 April 2016 8,791 6 View

How can I explain gas discharge with hollow electrodes?

Hello. The mechanism of the gas discharge is quite well-known when the gas is filled between two plane electrodes. In this case electron emission from cathode have significant role to get into...

14 April 2015 2,145 7 View

Could you help to deal with grounding problem in high voltage lab?

I know this should be complicated issue thus seems no clear answers. I just want to get some basic rule for grounding. Our lab is to discharge sub-atm pressure hydrogen gas with several tens of kV...

02 April 2015 1,579 7 View

How can bnc cable terminal work for impedance matching?

Hello. There is an instument with HighZ load and this is connected via 50 Ohm BNC cable to Oscilloscope(OSC) with several impedance selections (HighZ, 75 and 50 Ohm). People say I can choose 50...

21 February 2015 8,619 10 View

How can I calculate the laser intensity after laser passes through axicon?

Hello. For typical spherical lens, calculation of the focused intensity for the laser is simple: numerical number gives diffraction limited focused radius of the laser thus everything is...

16 February 2015 1,072 5 View

How is collisional frequency modified if target species is not cold?

Hello. The standard way of expressing collisional freq is n*sigma*v where n, sigma and v represents target species density, collisional scattering cross section and mean incident particle...

07 October 2014 3,386 2 View

How do you calculate the electron bunch charge with a given laser energy and quantum efficiency in a photocathode?

Hello. I'm now calculating charge of the e-bunch generated from the photocathode which is hit by the laser pulse. The following is my condition. 1. Laser energy: 600 mJ. 2. Laser diameter: 7...

31 July 2014 250 5 View

Is there any way to calculate the thermal conduction time with given thermal conductivity?

I'm working in the plasma physics and trying to calculate the thermal conduction time or speed. The plasma treated has cylindrical symmetry surrounded by the dielectric material. Right now I need...

03 June 2014 3,349 10 View