VPAL-A Accessories Usable with Other Vacuum Trainers

  

The VPAL-A, manufactured by The Science Source (TSS), has a number of interesting add-on packages that may be used with other manufacturers' vacuum pumping systems and trainers. For those with MKS VTS-1B trainers, I have indicated if a fitting adapter is needed or other accessory is needed.
Contact The Science Source for ordering details on the VPAL-A kits.
Please direct inquiries to me about using these TSS VPAL-A kits with other vacuum systems.

Plasma Topics Kit #46010

This TSS kit includes a dc high voltage, current limited power supply, components to perform sputter deposition, fixturing and phosphor screen to create and view an electron beam, and a Hittorf ("detour") tube to demonstrate obstructed and constricted glow discharges. (Please see these video clips of a similar ebeam device and a Hittorf tube.)
The TSS Plasma Topics Kit requires a special 1-3/8 inch diameter chamber with a KF40 compression fitting. These may be ordered from TSS. The KF40 fitting replaces the standard 1-1/2 inch compression fitting that is supplied with the MKS VTS-1B.
To use this kit, your vacuum system should be capable of achieving stable pressures over the range of 50 milliTorr to 5 Torr.

Crookes Radiometer #46040

Toy radiometers are evacuated to a specific pressure range and are then sealed. This item from TSS is a radiometer that is connected to a KF40 flange. When connected to a pumping system that is equipped with a pressure gauge, you can observe a variety of effects as the pressure decends to about 1 Torr and then to below 0.1 Torr. The use of this device is greatly enhanced if you are simultaneously observing a pressure vs time plot (as may be done with the VTS-1B's MKS146 software). This radiometer shows outgassing and thermal transpiration effects in a very vivid way.
Your vacuum system should be capable of operation down to about 60 milliTorr or better.

Thermal Conductivity and Mean Free Path #46042

This device consists of a hot wire element and constant current power supply. It acts as a simple Pirani gauge. When the sensor is attached to a vacuum system and the voltage across the filament is monitored, the characteristic S-shaped voltage-pressure curve will be produced. The most interesting use of the device is to use the relationships involving mean free path, thermal conductivity and the filament diameter to calculate the diameter of an "air" molecule. A full explanation is included with the device.
The sensor is contained in a 3/8 inch diameter aluminum tube. This will insert directly into the fitting at the top of the VTS-1B's standard glass chamber.
Your vacuum system should be capable of operation over a range of 50 milliTorr to 5 Torr.

Hot Wire Vacuum Evaporation Kit #46046

Who says you need high vacuum conditions to metallize a substrate by vacuum evaporation? This accessory consists of a glass chamber, substrate support, filament fixture and starter supply of consumables. The source material is a common alloy of two metals - one with a low vapor pressure and the other with a high vapor pressure (feel free to guess what the alloy is). When heated to a moderate temperature, only the high vapor pressure component is evaporated. This device demonstrates a practical vacuum process (evaporation) and also provides an excellent demonstration of vapor pressures.
Using this device on the MKS VTS-1B requires a special 1-3/8 inch diameter chamber with a KF40 compression fitting. This may be ordered from TSS. The KF40 fitting replaces the standard 1-1/2 inch compression fitting that is supplied with the MKS VTS-1B.
To use this accessory, your vacuum system should be able to achieve a base pressure below 100 milliTorr.

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