Overview:

A magnetic ion beam deflector is installed to prevent viewport damage due to ion / electron beam bombardment. Additional lead glass disks are installed infront of the viewports for x-ray shielding

Viewport Shield(11/15/2015)

Ion / electron beam bonbardment of viewport

Viewport Shield(11/15/2015)

NdFeB magnets mounted on modified aluminum clamp

Viewport Shield(11/15/2015)

NdFeB magnets mounted on aluminum clamp

Viewport Shield(11/15/2015)

Magnetic deflector mounted on fusor to protect viewport

Viewport Shield(11/15/2015)

Magnetic deflectors for all 4 viewports

Viewport Shield(11/15/2015)

Lead glass disk for x-ray shielding and holder

Viewport Shield(11/15/2015)

Lead glass disk mounted on viewport

Viewport Shield(11/15/2015)

Ion / electron beam now deflected.

Viewport Shield(5/1/2016)

Ion / electron beam now deflected.

Viewport Shield(5/1/2016)

Second magnet added for greater deflection power for D- ions

Viewport Shield(5/1/2016)

Due to the previously observed interaction of the sputtered material and D- beam with AR dielectric coatings an internal shield system was designed to prevent exposure of the viewport internal surface with plasma or sputtered material.

Viewport Shield(5/1/2016)

A pump out duct in the side of the adapter vents the volume between the shield and the viewport.

Viewport Shield(5/1/2016)

A stainless adapter holds a 1.25" diameter 1/8" thick glass disk inside the vacuum system in front of the the viewport. The glass disk is held in place with a internal retaining ring. No groove in machined in the adapter, the friction force of the ring is sufficient to securely hold the disk in place.

Viewport Shield(5/1/2016)

Dimensions of the shield holder are as follows
Glass disk is McMaster 8477K28
Retaining ring is McMaster 92479A790

Viewport Shield(5/1/2016)

The adapter allows the glass disk to hang off of the free space inside the copper o-ring between the two conflat flanges.

Viewport Shield(5/1/2016)

The viton o-ring sealed glass disk viewports were replaced with AR coated vacuum rated viewports.

Viewport Shield(5/1/2016)

The small distance between the shield and viewport, and large aperture of the shield prevents any restriction in field of view.

Viewport Shield(5/1/2016)

The small distance between the shield and viewport, and large aperture of the shield prevents any restriction in field of view.

Viewport Shield(5/1/2016)

The lead glass x-ray shield is held in place with an o-ring but a plastic holder will be machined to securely hold it in pace.

Viewport Shield(5/1/2016)

Useful links:

http://www.fusor.net/ Open Source Fusion Research Consortium.

By attempting to reproduce any experiments or devices listed on this domain in part or in whole, you agree to hold me harmless against any lawsuit or liability.

Copyright © 1998 - 2005 by Andrew Seltzman. All rights reserved.