You are bidding on a Great Condition VARIAN V30T 911-5032 TRIODE SPUTTER ION PUMP with ACCESSORIES as can be seen in the pictures.
INCLUDES THE EXTRA ACCESSORIES WHICH CAN ALSO BE SEEN CONNECTED TO THIS VARION ION PUMP!!!
Operationally it is in 100% PERFECT CONDITION, that's why we offer a 90-DAY-WARRANTY!
Varian Ion Pump 911-5032 High Vacuum 4.50 Conflat Sputtering Getter Pump.
Make sure to check online information on this Varian Ion Pump by GOOGLING the following link: npl.washington.edu/TRIMS/sites/sand.npl.washington.edu.TRIMS/files/manuals-documentation/Varian%20-%20ion%20pump%20manual%20scanned.pdf
Information taken from the WEB below:
Nitrogen Pump Speed: 21
Overview
The sputter-ion pump operates on the principle of the Penning cold-cathode discharge. In this type of pump, a combination of magnetic and electric fields sustains a discharge in a structure such as shown in Figure 1. In the most common configuration, an array of cylindrical anode cells is placed between parallel cathode plates made of titanium. A positive voltage of between 3000 volts and 7000 volts is applied to the anode and a magnetic field of between 1000 and 2000 gauss is ap- plied parallel to axis of the anode cells. At pressures below approximately a millitorr, a cloud of spiralling electrons is captured inside the anode cells. These electrons collide with residual gas mol- ecules to form positive ions. The gas molecules, being heavier and of opposite charge than the elec- trons, accelerate out of the anode cell toward the cathode plates. When they reach the cathode, the ions release their energy, causing:
1. Some of the titanium atoms to be released (sputtering). This chemically active material is deposited onto surfaces nearby. It acts as a getter until saturated.
2. Secondary electrons to be released, which get incorporated into sustaining the discharge inside the anode cells.
3. Chemical reaction with the titanium, if the gas ion is an active, and/or burial in the cathode for both active and noble gases.
Triode
In the triode configuration of sputter-ion pumps, two basic changes are made:
a. The voltage polarity is modified, so that the anode array is grounded and the cathode plates are operated at a negative high voltage.
b. The cathode is constructed of strips of titanium instead of a flat plate.
This combination of changes shifts the balance of sputtering, ion burial, re-emission and net noble gas pumping to the point where stable pumping of air and modest loads of noble gases can be maintained.
Several variations of this structure, called triode, StarCell, etc., have been used, with more or less success in stabilizing noble gas pumping.
Stock # 220503
