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 Penning trap vacuum chamber within the bore.Please provide some reference what kind of waveguide to be used or the window to transport it to the chamber. Kind of antenna that work at 4K and some details. I would also like to measure the losses in transmission if possible or power that it transfer to trapped ions directly if possible?
I suggest you look at the properties of CPWs (co-planar waveguides).
As far as I know they have no upper limit (he said).
We have worked to 20+GHz, See New Journal of Physics Vol16 063002 (2014)
Depends on the mode composition, power and how much loss you can tolerate.
160GHz already is 2mm, so quazi-optical methods (lens in open space) work very well. I used a low-reflectance windows in superconductive magnet bore; usually the windows can be made of quartz (clear and visible) or mylar film. There may be one or two windows - one is warm on the outer wall of the cryostat, and optionaly there may be a window on N2 coold thermal shield. 50um mylar have nearly no inernal resonances.
Then you can have a horn or dielectric antenna at the end of your waveguide, followed by a teflon or polystyrene lens (good news about polystyrene - it is transparent to visible light and its refractive index is nearly the same - so you can check the focus with a flashlight). Lens should focus the radiation on the sample.
Another two options - wispering gallery waveguide (thin-wall stainless steel pipe, ~5mm ID), or a teflon rod waveguide. Both have low thermal conductance so that you can bring the radiation close to the sample).
An AC-modulated excitation and a detector at 90 degrees to the reference beam can be used to see how your sample captures excitation.
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