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Help me identify this thyratron E2V FX2602
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bk
May 7, 2013, 4:38:48 PM5/7/13
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It's a EEV FX2602. I contacted E2V for the specs, but they have no information on it. Apparently it was a semi-custom item. I know it was used for a laser (either excimer or CO2).
I'm not clear on the grids. There are two grid ring attachements, one near the middle and one close to the bottom cathode. It's a grounded cathode, not grounded grid type of thyratron. But I don't know if the two grids are two control grids G1, G2, or one control grid and one gradient grid.
Most of the E2V thyratrons which have two grids bring the bottom grid on a wire out the bottom of the unit. Mine doesn't do that. On the bottom there are only the cathode and reservoir heater wires.
So, I'm thinking that the upper grid is actually a gradient grid, and the lower grid is the control grid. But if so, that lower one looks to be very close to the cathode, not higher up like I would expect. Or is the bottom ring a 'keep alive' grid and the upper ring is the control grid?
Can anyone clarify? If not, my next plan is to x-ray the thing to see the insides.
http://s1313.photobucket.com/user/bkuschak/library/
I'm not clear on the grids. There are two grid ring attachements, one near the middle and one close to the bottom cathode. It's a grounded cathode, not grounded grid type of thyratron. But I don't know if the two grids are two control grids G1, G2, or one control grid and one gradient grid.
Most of the E2V thyratrons which have two grids bring the bottom grid on a wire out the bottom of the unit. Mine doesn't do that. On the bottom there are only the cathode and reservoir heater wires.
So, I'm thinking that the upper grid is actually a gradient grid, and the lower grid is the control grid. But if so, that lower one looks to be very close to the cathode, not higher up like I would expect. Or is the bottom ring a 'keep alive' grid and the upper ring is the control grid?
Can anyone clarify? If not, my next plan is to x-ray the thing to see the insides.
http://s1313.photobucket.com/user/bkuschak/library/
Salmon Egg
May 7, 2013, 5:49:47 PM5/7/13
to
In article <fcfb248e-d4e8-4d00...@googlegroups.com>,
bk <bkus...@gmail.com> wrote:
> http://s1313.photobucket.com/user/bkuschak/library/
My very wild guess is that it is a hydrogen thyratron very similar to
the kind EG&G used to make.
--
Sam
Conservatives are against Darwinism but for natural selection.
Liberals are for Darwinism but totally against any selection.
bk <bkus...@gmail.com> wrote:
> http://s1313.photobucket.com/user/bkuschak/library/
My very wild guess is that it is a hydrogen thyratron very similar to
the kind EG&G used to make.
--
Sam
Conservatives are against Darwinism but for natural selection.
Liberals are for Darwinism but totally against any selection.
bkus...@gmail.com
May 8, 2013, 11:29:05 PM5/8/13
to
> My very wild guess is that it is a hydrogen thyratron very similar to
>
> the kind EG&G used to make.
>
> Sam
>
> the kind EG&G used to make.
>
Yes, you're right, it is a hydrogen thyratron. That much I knew.
Apparently, only multi-gap thyratrons have gradient grids. I found a datasheet for the FX2803, a dual gap triode thyratron from EEV, and it looks similar to the one I have. That one also was designed for CO2 pulsed laser applications. I think the FX2602 is a lower-voltage version of the same kind.
The fact that the grid connections are widely separated is what makes me think this is a dual gap thyratron, rather than a single-gap type with two grids.
Brian
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