| | 17 | [[br]] |
| | 18 | = Source Maintenance = |
| | 19 | [[br]] |
| | 20 | Inside the source is a platinum mesh electron gun which starts a plasma. The mesh has a special coating which wears out |
| | 21 | after about 2-3 months of running (depending on amount of use). As time goes on and the coating wears out the source |
| | 22 | will need more arc current and source gas (H2) to maintain beam magnitude. When the coating is really worn out you will not |
| | 23 | be able to start a plasma. |
| | 24 | [[br]] |
| | 25 | Another paramater to keep on eye on is the current drawn by the primary electrode. If the power source of the primary electrode |
| | 26 | (labeled Beam Energy) is over 1.2 mA, then this could be a sign that the cooling water has too many impurites and has a |
| | 27 | decreased electrical resistance. The water must be changed and possibly the de-magnetizing filter. |
| | 28 | The filter can be obtained by contacting Peabody Scientific (Frank Schmurra: 978.535.0444). |
| | 29 | The filter is a bag of beads in a sealed cloth bag. DO NOT OPEN THE BAG!!! The bag must be |
| | 30 | intact when it is put into the system. Go to the blue-grey box under the bender and open it. |
| | 31 | Be careful, there is electric equipment everyhwere, shut off all close by electic equipment, the turbo and rough pump |
| | 32 | are ok to leave on.Inside is the cooling system for the source. Using a pan, drain the water out of the system. |
| | 33 | There is a clear plastic cylindrical filter holder, unscrew the outside cap carefully so to not spill the water in it |
| | 34 | on top of the motor that pumps the water through the cooling lines. The old filter bag is sitting in this piece in a |
| | 35 | mesh basket. Simply take out the old one, and place the new filter inside. The old one can be thrown out with the |
| | 36 | regular trash. Make sure that the rubber gasket is in place and screw the filter holder back on. |
| | 37 | Re-connect the water pipes and add distilled water in the PVC pipe top , it should only take one gallon (3.8 Liters)? at most. |
| | 38 | There is a flow meter interlock in this cooling system, the source power will shut off if it does not detect fluid flowing. |
| | 39 | When turning the cooling system on, hold down the power button for a minute or so, this makes sure all the air pockets get pushed |
| | 40 | out of the system which could have shut down the power. |
