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Re: Mark3 operation 3e-4 torr / quad ion source @ -40kV, 1mA-9mA
Posted: Sat Feb 02, 2019 8:30 am
by Dennis P Brown
Nice apparatus! A side possibility; you can get single crystal silicon wafers super cheap (even select from the company what plane it was cut - 001, 011 etc.). Set it at the correct angle relative to your camera (maybe a micrometer rotation mount) and use it to get specific energies from the electron x-rays. The wafer need not be in the vacuum just line of sight to the x-ray source. Closer, of course, the better.
A side thought: one could "focus' the x-rays by placing the wafer on a circular vacuum ring and apply a moderate vacuum to deform the wafer into a spherical surface. This will weakly focus grazing x-rays off its front surface to "image" the source and provide an energy spectrum.
Re: Mark3 operation 3e-4 torr / quad ion source @ -40kV, 1mA-9mA
Posted: Sat Feb 02, 2019 11:54 am
by Andrew Seltzman
I'm planning to do something similar for energy. I have some CZT detectors which I'll mount on an x-y drive to position over the part of the image that I want to probe the energy at.
Re: Mark3 operation 3e-4 torr / quad ion source @ -40kV, 1mA-9mA
Posted: Sun Feb 03, 2019 12:07 am
by Andrew Seltzman
Some upgrades to the x-ray camera now include:
Diffrent molybdenum pinhole sizes 1.5mm, 1.0mm, 0.5mm to sharpen the image
A 3D printed sensor holder to allow zooming in by varying the distance from the sensor to the pinhole
Picture taken with a 1.5mm pinhole for 30s:
Picture taken with a 1.0mm pinhole for 30s:
Picture taken with a 0.5mm pinhole for 60s:
Picture taken with a 0.5mm pinhole for 60s (brightened):
Reducing the pinhole size noticeably sharpens the image at the expense of intensity.
Re: Mark3 operation 3e-4 torr / quad ion source @ -40kV, 1mA-9mA
Posted: Sat Jun 03, 2023 8:07 pm
by Andrew Seltzman
New upgrades on the Mark 3:
New more compact cooling system using 3d-printed components and including more compact coolant pressure and flow measurements
New grid assembly with 3d printed insulator box to allow a more compact design:
Re: Mark3 operation 3e-4 torr / quad ion source @ -40kV, 1mA-9mA
Posted: Sat Jun 03, 2023 11:37 pm
by Richard Hull
Very nice work. We all like to catch up on making out material better or better mounted for control purposes.
Richard Hull
Re: Mark3 operation 3e-4 torr / quad ion source @ -40kV, 1mA-9mA
Posted: Mon Jun 05, 2023 5:24 am
by Dennis P Brown
Beyond good - extremely professional. What is your ultimate objective for measuring the x-ray energies from a fusor?