[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [TCML] first light
DC arcs are far different from AC arcs in that the maximum length of a DC discharge is determined by the electrode characteristics, the medium to be ionized, and the voltage acrossed the eletrodes whilst the length of an AC discharge is determined also by frequency and waveform. Consider the output arc of a Marx generator and that of a TC or maggie (also consider the difference in arc between an SSTC, VTTC, and an SGTC).
On Wed Jul 13th, 2011 1:33 PM EDT Carl Noggle wrote:
>That's true. I don't think I'd call it a good way, but it is a way. Hmmmmmmm--I guess I did call it a good way. It's an OK way if one is careful about the things you mention. A small piece of dust can act as a breakout point, which greatly lowers the inception voltage.
>
>---C
>
>
>> On 7/13/11 12:03 AM, Carl Noggle wrote:
>>> Hey-- A toroid or any top electrode will light up with corona when the
>>> electric field at its surface is about 30 kV per cm. For a sphere, the E
>>> field at the surface is voltage/radius. For example a sphere with a 10
>>> cm radius will light up at 300 kV or above. A cylinder will require
>>> twice the voltage to get the same E field, so a 10 cm radius cylinder
>>> will light up at 600kV. The field at the surface of a toroid is a little
>>> lower than that of a cylinder, but not much. So we would expect a 7x30
>>> toroid (8cm radius x 37.5cm radius)to turn on at 30kv/cm*8cm*2 = 480kV,
>>> or about 0.5 MV. When this voltage is reached, many dancing streamers
>>> will suddenly appear. Using toroids or spheres like this is a good way
>>> to measure the voltage.
>>>
>>
>>
>> I don't know that corona inception voltage is a good way to measure voltage. It's affected by things like surface imperfections, dust, etc.
>>
>> Even in a well controlled laboratory environment, looking for breakdown in polished sphere gaps with a radioactive source to make sure there's ions floating around is probably only good to a few percent.
>> _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>>
>>
>> __________ Information from ESET NOD32 Antivirus, version of virus signature database 6292 (20110713) __________
>>
>> The message was checked by ESET NOD32 Antivirus.
>>
>> http://www.eset.com
>>
>>
>
>
>
>__________ Information from ESET NOD32 Antivirus, version of virus signature database 6292 (20110713) __________
>
>The message was checked by ESET NOD32 Antivirus.
>
>http://www.eset.com
>
>
>_______________________________________________
>Tesla mailing list
>Tesla@xxxxxxxxxx
>http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla