Current Mark3 cad revision:

Mark3-rev13

Previously documented Mark3 cad revision:

Mark3-rev9

Revision 9 was used for the collection of all stage1 data.

Current Mark3 cad revision animation:

Revisions 0 through 13 in GIF format.

New grid cooling pumps:

New water cooling loop and fluorinert cooling loop pumps (leftmost 2) replace the old cooling pumps.

New grid cooling pumps:

New water cooling pumps are higher performance achieving nearly silent operation while greatly reducing space requirements.

The new fluorinert pump uses a high performance brush less electronic drive, coupling magnetically to the internal pump drive thereby eliminating the need for a motor driven magnet yoke and eliminating decoupling problems. The higher capacity allows the pump to operate at a lower rotation speed reducing coolant temperature.

The new water pump also uses a brush less drive design of a spherical impeller mounted on a graphite ceramic point contact bearing allowing higher performance and silent operation.

Radiator modifications:

New right angle swivel coolant connections reduce space, and improve coolant line routing.

Cooling Fan (3/14/2011):

New cooling fan, Nidec VA450DC runs on 12Vdc instead of 120Vac and is rated at 220CFM. PWM control allows variable speed operation.

Cooling Fan (3/14/2011):

Mounted on reactor, now exhaust blows over the core, cooling it.

Cooling Fan (3/14/2011):

Old cooling fan removed.

Control system upgrade:

New control system uses a dsPIC30F2012 microcontroller and will use fiber optic cabling to the host computer to eliminate electrical interference.

All instrumentation and control equipment on the Mark 3 will be upgraded to use high speed serial over fiber multiplexed over a common control port.

Vacuum system upgrade:

New turbo pump with magnetic bearings is significantly smaller. Vacuum system will be fitted with electrically controlled valves.

Vacuum system upgrade:

Turbo pump controller.

Vacuum system upgrade:

Vacuum hub completely removed and upgraded to use 2.75" conflat cube, electrical valve and MKS quattro 999 gauge.

Anode Layer Ion Source:

Four anode layer ion sources will allow stable operation at pressures under 10mTorr. These sources replace the ECRF ion injectors which never worked properly and were not used in fusor operation.

• Anode Layer Ion Source

Grid Power Supply:

Spellman series 3000 power supply will supply power to the ion accelerating grid for reactor testing.

• Power Supply