A. K. Sikdar

6 Questions 20 Answers 0 Followers

Questions related from A. K. Sikdar

Could someone help me with the name of company which sells cold emission electron gun based on carbon nanotube other than "cathode.com"?

I am in need of field emission miniature electron source of dimension( 1-2 mm diameter emission area and few mm long) which could generate few micro-amp of current at 100-200 V of applied voltage....

28 November 2016 4,687 5 View

Why is the cable impedance of 50 ohm cable is considered to be real in all calculations,whereas measurement of resistance by multimeter show infinite?

I am a Physics person. I am stuck with this simple thing which could be very obvious. Please help me to resolve this issue.Cable Impedance of 50 ohm cable is always considered to be real in all...

11 November 2014 3,112 17 View

Can someone suggest some name of commercial 50 ohm cryogenic, vacuum feedthrough company?

I want a 50 ohm coaxial, vacuum feedthrough capable of operating at 4 K . It should be non- magnetic too if possible? Please suggest any company that provide it commercially....

20 September 2014 1,957 10 View

Can anyone provide a reference how to take 160 GHz microwave to an enclosed chamber at 4k and a method to measure it?

I want to shine Penning trap at 4k with 160GHz, but I have no idea how to do it? I have a 10 cm diameter cold bore ( Liquid Helium filled bore magnet) and I need to take 160GHz all the way to the...

10 June 2014 6,148 2 View

Can we apply the concept of non exponential decay and quantum superposition to understand fission lifetime?

As we know in Quantum Mechanics,an unstable state remain as a superposition of intial state and decayed state.As long as quantum superposition persist classical exponential decay law is not valid,...

07 June 2014 6,775 1 View

How does K shell electronic wave-function change at the position of nucleus, when K X ray is emitted?

When a K shell X ray is emitted due to transition of electrons from upper states to K shell vacancy, is there any change of electronic wave-function of K shell at the position of the nucleus? Any...

17 December 2013 4,995 3 View