[Sneap] Electrical isolation and coolant

[Arthur Haberl]

We use Multitherm 503 for terminal cooling.  It is flammable if pushed far 
enough.

see:     http://www.multitherm.com/multitherm-503.html

    Art Haberl

----- Original Message ----- 
From: "Pertti O. Tikkanen" <pertti.tikkanen at helsinki.fi>
To: "Symposium of Northeastern Accelerator Personnel" <sneap at tunl.duke.edu>
Sent: Tuesday, November 13, 2007 2:20 AM
Subject: Re: [Sneap] Electrical isolation and coolant


> Paul,
>
> We have been using Shellsol as coolant for our MC-SNICS and Alphatross ion
> sources. It has worked well for years in our application. See if Shellsol
> properties suit yours. It is an industrial solvent used in cleaning e.g.
> motor parts and thus leaks should not be a problem.
> When replacing DI water with some other coolant one maybe needs to
> consider the difference in the heat transfer properties also.
>
> Regards,
> Pertti
>
> -- 
> Pertti O. Tikkanen, PhD
> Senior Laboratory Manager
>
> Accelerator Laboratory
> Department of Physical Sciences
> Box 43 (Pietari Kalmin katu 2)
> FIN 00014 University of Helsinki
>
> Office:  +358 9 191 50006
> Telefax: +358 9 191 50042
> Mobile:  +358 40 726 5386
>
>> Paul,
>>     You probably used R-113.  We still use it in our Helium source for
>> cooling - it is still available but expensive.  I do not know of a direct
>> replacement.  I would recommend revisiting the DI water cooling option.
>> We have several home built systems in use and they work well.  We have a
>> DI
>> service company change the canisters every six months and don't have
>> conductivity problems.  This is less than $100 as I recall. The highest
>> voltage difference is just 200 kV however.
>> Regards,
>> - Chris
>> --
>>
>> Chris R. Westerfeldt
>> Research Scientist / T.U.N.L. Radiation Safety Manager
>> Duke University Physics Department &
>> Triangle Universities Nuclear Laboratory
>> Science Drive, Box 90308
>> Durham, NC  27708-0308
>> Tel: (919) 660-2600
>> Fax: (919) 660-2634
>> Email: Cwest at Tunl.Duke.Edu
>>
>>
>>> From: Paul Voytas <pvoytas at wittenberg.edu>
>>> Reply-To: Symposium of Northeastern Accelerator Personnel
>>> <sneap at tunl.duke.edu>
>>> Date: Mon, 12 Nov 2007 14:11:55 -0500
>>> To: Symposium of Northeastern Accelerator Personnel
>>> <sneap at tunl.duke.edu>
>>> Subject: [Sneap] Electrical isolation and coolant
>>>
>>> Fellow SNEAPers,
>>>
>>> Short statement of problem:
>>> I'm searching for a high resistivity, non-flammable, non-corrosive,
>>> non-oil, ozone-safe, low greenhouse effect, fluid to use as coolant in
>>> an atmospheric pressure cooling system.
>>>
>>> Long story:
>>> We have an old, small, single ended accelerator we are trying to get
>>> reliably in shape for use as a teaching tool. The accel has a rollaway
>>> tank and historically, it's been run without the tank on. To get the
>>> voltage up and the xray dose down, we run with the tank on now (With SF6
>>> at atmospheric pressure).
>>> The problem is cooling the up-to-1000W RF source . With the tank off, a
>>> squirrel cage fan keeps everything fine. With the tank on, there's a
>>> heat exchanger (=radiator) in front of the fan that we can run coolant
>>> through. The coolant system is designed to be at atmospheric pressure
>>> and historically it used a freon ( 134a maybe?). Due to freon expense
>>> and ozone protection issues, I'm now using a perflourinated hydrocarbon
>>> (Dow performance fluids 5060 or 5080 ). I'd tried DI water, but the
>>> resistivity wasn't high enough--or didn't stay high enough and I don't
>>> have an active DIing system. The perfluorinated fluids are not cheap
>>> either (and they're pretty bad (good?) greenhouse gases) and I'm worried
>>> that the fluorine containing decomposition products (from the high x-ray
>>> fluxes) will end up corroding the system. I'd rather not us an oil if I
>>> can avoid it because a leak would cause a terrible mess that I'm not
>>> sure I could clean off the machine. I'd also rather not use
>>> flammables... I think the list is getting pretty short?
>>>
>>> Question:
>>> Does anybody have info on any fluids besides the perfluorinated
>>> hydrocarbons that satisfy these (or most of these) constraints?
>>>
>>> Thanks for any ideas,
>>> -Paul Voytas
>>>
>>> --
>>>
>>> pvoytas at wittenberg.edu
>>> office: 937-327-7823
>>> fax:    937-327-6340
>>>
>>> Physics Department
>>> Wittenberg University
>>> P.O. Box 720
>>> Springfield, OH 45501
>>>
>>> alt email: pvoytas at uwalumni.com
>>>
>>> _______________________________________________
>>> Sneap mailing list
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>>
>
>
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