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HY-3205 Datasheet

Deuterium Triode Thyratron

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HY-3205
Deuterium Triode Thyratron
Description
The HY-3205 is a deuterium-filled, triode thyratron designed for grounded grid operation. The
grounded grid configuration (Note 1) allows the tube to be operated at a higher peak current
compared to a similar grounded cathode thyratron. The deuterium fill gas facilitates operation at a
higher voltage and low to moderate pulse repetition rates as compared to similar thyratrons having a
hydrogen fill gas. The relatively high pulse current is achieved while employing only free or forced air
convection cooling. The tube is mounted by its grid mounting flange in any position.
Specifications
Absolute Ratings
(Maximum)(Non-Simultaneous)
epy, Peak Forward Anode Voltage, kv (Notes 2, 3, 4)................................................................32 kv
ib, Peak Forward Anode Current, a (Notes 5, 6).................................................................. 20,000a
ibx, Peak Reverse Anode Current..........................................................................................Note 7
epx, Peak Reverse Anode Voltage, kv (Note 8).........................................................................20 kv
Ib, Peak Average Anode Current, Adc......................................................................................5 Adc
Ib, RMS Average Current , Aac (Note 9)..............................................................................47.5 Aac
Anode temperature, °C (Note 10)........................................................................................ 450 °C
Charge transfer per shot, (Note 11)............................................................................ 10 Coulombs
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HY-3205 Deuterium Triode Thyratron, Page 1 of 6



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HY-3205 Datasheet

Deuterium Triode Thyratron

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HY-3205 pdf
HY-3205
Deuterium Triode Thyratron
General Electrical Data
Ef, Cathode Heater Voltage, Vac ........................................................................................6.3±8%
If, Cathode Heater Current @ Ef=6.3 Vac, Aac .............................................................. 14.4 - 17.6
Er, Reservoir Heater Voltage, Vac (Note 12).........................................................................6.3±8%
Ir, Reservoir Heater Current @ Er=6.3 Vac, Aac ................................................................ 2.4 - 3.3
Tk, Minimum Tube Warm-up Time, Minutes ................................................................................10
Trigger Driver Requirements
MIN
TYP MAX.
Egy, Peak Open Circuit Driver Voltage, Negative Going
Applied to The Cathode, v................................................... 500.................750............... 1500
Zg, Driver Circuit Output Impedance, Ohms............................... ---..................100................ 250
Driver Pulse Rise Time, ns.......................................................... ---..................100................ 150
Driver Pulse Width, μs................................................................ 1.....................2................... ---
Peak Reverse Driver Voltage, v.................................................. ---...................---................... ---
Bias Voltage, Positive, V............................................................ ---...................---.................. 300
Triggering Characteristics
MIN
TYP MAX.
Anode Delay Time, μs (Notes 13, 14)......................................... --- ..................--- ................. 500
Anode Delay Time Drift, ns (Note 14)........................................ --- ..................--- ................. 150
Time jitter, ns (Note 14)............................................................ --- ..................--- ................... 5
Current Rise Time, ns (Note 15)................................................. ---....................7................... ---
Notes
1. This thyratron is designed to operate with the grid at chassis ground potential. The tube is driven into conduction by applying the triggering
pulse to the cathode lead. Therefore, the limits shown for egy are negative while the bias voltage is positive (i.e., the opposite polarity of what
would be the case for triggering a standard grounded cathode thyratron.
2. The dwell time at the peak anode voltage should be minimized in order to minimize prefiring. For operation at the rated epy, the dwell time
must not exceed 1 millisecond.
3. After thyratron anode current stops flowing and before voltage is reapplied to the anode, the anode voltage must stay between 0 and –500
volts for at least 100 μs to allow the gas to deionize.
4. This tube may be operated in air at up to 32 kv. Some of the more important derating factors that determine the safe operating voltage in air
are the cleanliness of the tube’s ceramic insulators, the rate of rise of anode voltage, the dwell time at the operating peak anode voltage, the
pulse repetition rate, and ambient pressure, temperature, humidity and contaminant level. This tube may also be operated while immersed in an
insulating gas or liquid.
5. The peak current capability of 20,000 amperes applies to low duty, short discharge duration (shorter than 150 nanoseconds) applications
without significant reverse current.
6. For anode current discharges longer than 150 nanoseconds or for discharge waveforms which exhibit significant current reversals use the
charge transfer per shot limitation for determination of the allowable peak current capability.
7. This tube is recommended for applications where the discharge current waveform has reversals. Each time the current reverses, the magnitude
of the current on that reversal must not exceed 60% of the magnitude of the current on the half cycle immediately preceding it.
8. The reverse anode voltage shown applies for a previously nonconducting tube. Exclusive only of a spike not longer than 25 nanoseconds, the
peak reverse anode voltage must not exceed 5kv during the first 50 microseconds after conduction.
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HY-3205 Deuterium Triode Thyratron, Page 2 of 6


Part Number HY-3205
Description Deuterium Triode Thyratron
Maker Excelitas
Total Page 6 Pages
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