Applied Furtonic Research

Hardware archeologist/Industrial & lab instrument player. ⚡⚛️☢️🏳️‍🌈

[Applied Furtonic Research @IAtomictek]

Contaminated gate valve

[Applied Furtonic Research @IAtomictek]

@Kristall_Wang_ 磁偏转的rheed gun不常见啊，看起来像是哪个课题组手搓的设备，现在很多商用级系统为了追求小体积都是电偏，第一次见这么大的。

[Applied Furtonic Research @IAtomictek]

@beamshift @macona The JEOL microscope did have vacuum gauges, but the vacuum meter is just a microammeter calibrated in microamps. I’m not really sure what the actual vacuum pressure is.

[Applied Furtonic Research @IAtomictek]

High voltage failure occurs, possibly due to electron gun arcing or dielectric breakdown from the high voltage cable.

[Applied Furtonic Research @IAtomictek]

@macona Yes, this TEM has a diffusion pump using Santovac 5 fluid, and I have a silicone heating tape that I might be able to use to bakeout the column, I’ll try that.

[Applied Furtonic Research @IAtomictek]

@macona That is reasonable, I’ll be putting some molecular sieves into the chamber and letting it sit for some days.

[Applied Furtonic Research @IAtomictek]

@macona Perhaps several years. When I received it, the gun section had been removed, and the top of the column was totally open, with a lot of dust inside, I have to clean it with no choice, There were even nut shells left by squirrels inside the electrical cabinet, horrible condition.

[Applied Furtonic Research @IAtomictek]

@macona Ethanol

[Applied Furtonic Research @IAtomictek]

@beamshift Suspecting the problem might be with the cables or the gun, I unplugged the high-voltage connector from the HV tank. When starting up, it seems fine and never tripped the protection. At 100 kV, the beam current is about 100 µA, probably caused by the flow of oil inside the tank.

[Applied Furtonic Research @IAtomictek]

@beamshift However, sometimes it could stay on stably for a while under 60kV, with an even higher beam current (about 80 µA). When I raised the high voltage directly to 80 kV, it could not stabilize, and every time the beam current went off-scale and tripped the protection.

[Applied Furtonic Research @IAtomictek]

@macona I cleaned the electron gun chamber with solvent, and the helium leak detector did not detect any serious leak.

[Applied Furtonic Research @IAtomictek]

Completely refurbished but still not very satisfying.
Knowing I could down the rabbit hole but still I’ll design a secondary electron detector & scanning module for this scope, possibly hard decision.

[Applied Furtonic Research @IAtomictek]

Diffusion pump is running

[Applied Furtonic Research @IAtomictek]

Power up

[Applied Furtonic Research @IAtomictek]

Making poor man’s 3-axis hall probe! It’s a replacement for lakeshore MMZ series but this one can handle up to 50kG field.

[Applied Furtonic Research @IAtomictek]

@CALVINGINEERING These old balzers pumps are nasty cause they’re prone to failure when you got one of these nowadays. Considering its lifespan, cleaning and oil reservoir replacement is advised.

[Applied Furtonic Research @IAtomictek]

All rubber pipes have been replaced, especially the evacuation port of the specimen airlock.

[Applied Furtonic Research @IAtomictek]

TEM airlock motion

[Applied Furtonic Research @IAtomictek]

TEM repair time

[Applied Furtonic Research @IAtomictek]

Update: Fixed the micrometer that used for sample stage displacement.
Vacuum system seems still in tight, when it arrives the camera chamber is still under vacuum.
Electronic components still require dust removal