On Wed, 20 Aug 2008 23:09:52 -0400, "Eisboch"
wrote:


wrote in message
...

On Aug 20, 7:57 pm, Vic Smith wrote:


This is the best thing I've seen on lightning, and think it pretty
well hits the mark on what you can do on a boat.
It's geared toward sailboats, but the principles are there.
For electronics gear, I would do the same as I do at home with my
computer and other electronic gear if I anticipate lightning:
unplug it. An insulated non-conducting case might be appropriate
for a radio when at sea.http://edis.ifas.ufl.edu/pdffiles/SG/SG07100.pdf

--Vic

That is a good article.

Thanks


It is a good article in terms of what happens when you get hit and how to
design for a hit.

The other school of thought is a design to minimize your chances of getting
hit in the first place.

Both approaches are not fool proof, as the effects of a hit are not 100%
predictable, nor is a system designed to minimize the chances of a hit 100%
effective.

Personally, having many years of experience in designing vacuum processing
equipment that contain controlled plasma discharges, (basically the same as
lightning, except it is a sustained and controlled electrical discharge
through ionized gas), I am more of a believer in the concept of minimizing
the conditions that would lead to a strike in the first place. Ironically,
the approach is almost the opposite of trying to design a system to capture
the energy of a strike and safely transfer it to ground.

Biggest trouble with avoidance is that any boat is the tallest thing
around, and will attract any lightning that would have struck anywhere
near there without it. You get a choice of the mast or the lightning
rod. No strikes on boats just isn't doable. They even put masts on
powerboats to get the radar and VHF antennae higher for more range.
The only counter measure that really works is radar and a very big
engine.
Hiding under a bridge works, if there is room. A powerboat in a marina
next to sailboats won't be hit. Someone checked statistics on one make
and model of powerboat and found that more than ten percent had been
hit in the last five years.

Casady

On Aug 21, 1:47 am, (Richard Casady)
wrote:
On Wed, 20 Aug 2008 23:09:52 -0400, "Eisboch"
wrote:





wrote in message
...

On Aug 20, 7:57 pm, Vic Smith wrote:

This is the best thing I've seen on lightning, and think it pretty
well hits the mark on what you can do on a boat.
It's geared toward sailboats, but the principles are there.
For electronics gear, I would do the same as I do at home with my
computer and other electronic gear if I anticipate lightning:
unplug it. An insulated non-conducting case might be appropriate
for a radio when at sea.http://edis.ifas.ufl.edu/pdffiles/SG/SG07100.pdf

--Vic

That is a good article.

Thanks

It is a good article in terms of what happens when you get hit and how to
design for a hit.

The other school of thought is a design to minimize your chances of getting
hit in the first place.

Both approaches are not fool proof, as the effects of a hit are not 100%
predictable, nor is a system designed to minimize the chances of a hit 100%
effective.

Personally, having many years of experience in designing vacuum processing
equipment that contain controlled plasma discharges, (basically the same as
lightning, except it is a sustained and controlled electrical discharge
through ionized gas), I am more of a believer in the concept of minimizing
the conditions that would lead to a strike in the first place. Ironically,
the approach is almost the opposite of trying to design a system to capture
the energy of a strike and safely transfer it to ground.

Biggest trouble with avoidance is that any boat is the tallest thing
around, and will attract any lightning that would have struck anywhere
near there without it. You get a choice of the mast or the lightning
rod. No strikes on boats just isn't doable. They even put masts on
powerboats to get the radar and VHF antennae higher for more range.
The only counter measure that really works is radar and a very big
engine.
Hiding under a bridge works, if there is room. A powerboat in a marina
next to sailboats won't be hit. Someone checked statistics on one make
and model of powerboat and found that more than ten percent had been
hit in the last five years.

Casady

Eisboch:

C'mon down and you can help build a big sputtering system for us.

wrote in message
...


Eisboch:

C'mon down and you can help build a big sputtering system for us.


It's funny. The bulk of the systems we designed and built were conventional
batch type box coaters for optics, utilizing thermal and electron beam
evaporation, often with an ion source for controlling the packing density.
Mostly for high energy laser stuff, but we also built several systems over
the years for ophthalmic coatings. "Neutral Green" :-)

We also built many sputter deposition systems for everything from optics,
diamond-like coatings, to razor blades.
Plasma processing systems was my personal favorite and interest. It
combines so many technical disciplines that it was never boring.

Eisboch

On Aug 21, 9:01 am, "Eisboch" wrote:
wrote in message

...



Eisboch:

C'mon down and you can help build a big sputtering system for us.

It's funny. The bulk of the systems we designed and built were conventional
batch type box coaters for optics, utilizing thermal and electron beam
evaporation, often with an ion source for controlling the packing density.
Mostly for high energy laser stuff, but we also built several systems over
the years for ophthalmic coatings. "Neutral Green" :-)

We also built many sputter deposition systems for everything from optics,
diamond-like coatings, to razor blades.
Plasma processing systems was my personal favorite and interest. It
combines so many technical disciplines that it was never boring.

Eisboch

We need to make a sputter system to deposit thin multilayers on small
diameter parabolic mandrels. The mandrels are highly polished and we
need coatings with surface and interfacial roughness of less than 10
angstroms. These are for x-ray mirrors. See our web site at
www.parallax-x-ray.com

wrote in message
...
On Aug 21, 9:01 am, "Eisboch" wrote:
wrote in message


We need to make a sputter system to deposit thin multilayers on small
diameter parabolic mandrels. The mandrels are highly polished and we
need coatings with surface and interfacial roughness of less than 10
angstroms. These are for x-ray mirrors. See our web site at
www.parallax-x-ray.com


Your process requirements are a bit out of my league, (primary concern is
surface roughness 10 angstroms). I have access to a small sputter
deposition system that was originally built for MEMs type research and small
scale production. It is basically new, very little use and would probably
be cheaper than designing and building your own system, assuming the
configuration, instrumentation and metrology is suitable for your purposes.

http://www.vptec.com/New_Pages/VPT_Products.htm

The system I am referring to is similar to the "SP-2000" Click on "Sputter
Systems", then SP-2000.

My company was recently sold, however this piece of equipment was not part
of the sale. I was going to hold on to it for my own purposes, or find
someone that can use it.

If you are interested, I can get the details of the configuration, power
supplies, cathodes, instrumentation, etc. and forward them to your
company's address.

Eisboch