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E2V Technologies CX1151 Hydrogen Thyratron
The data to be read in conjunction with the Hydrogen Thyratron Preamble.
ABRIDGED DATA
Hydrogen-filled tetrode thyratron, featuring low jitter and low anode delay time drift. Suitable for use at high pulse repetition rates, in parallel for switching higher powers, or for switching long pulses. A reservoir operating from the cathode heater supply is incorporated. The tube is flange mounted with flexible lead connections. Peak forward anode voltage . . . . . . 25 kV max Peak anode current . . . . . . . . 1.0 kA max Average anode current . . . . . . . 1.25 A max Anode heating factor . . . . . . 14 x 109 VApps max Peak output power . . . . . . . . . 16.5 MW max
GENERAL
Electrical
Cathode (connected internally to mid-point of heater) . . . . . . . . . oxide coated Heater voltage . . . . . . . . . . 6.3 + 5% V Heater current . . . . . . . . . . 22 A Tube heating time (minimum) . . . . . 5.0 min Inter-electrode capacitances (approximate): anode to grid 2 (grid 1 and cathode not connected) . . . . . . 13 pF anode to grid 1 (grid 2 and cathode not connected) . . . . . . 7.5 pF anode to cathode (grid 1 and grid 2 not connected) . . . . . . . 26 pF
Mechanical
Seated height (excluding leads) . . . Overall diameter (excluding mounting flange) .. Net weight . . . . . Mounting position (see note Top cap (see note 2) . . . 301.0 mm (11.850 inches) max
. 84.12 mm (3.312 inches) max . . 0.7 kg (1 1/2 pounds) approx 1) . . . . . . . . . any . . . . . . . B.S.448-CT3
PULSE MODULATOR SERVICE MAXIMUM AND MINIMUM RATINGS
(Absolute values)
Min Max
Anode
Cooling ............... natural Peak forward anode voltage (see note 3) . . . . . . . Peak inverse anode voltage (see note 4) . . . . . . . Peak anode current . . . . . Peak anode current (pulse repetition rate limited to 60 pps max) . . Average anode current . . . . Rate of rise of anode current (see note 5) . . . . . . . Anode heating factor . . . . . ..- ..- ..- ..- ..- ..- ..- 25 25 1.0 2.0 1.25 kV kV kA kA A
5.0 kA/ms 14 x 109 VApps
E2V Technologies Limited, Waterhouse Lane, Chelmsford, Essex CM1 2QU England Telephone: +44 (0)1245 493493 Facsimile: +44 (0)1245 492492 e-mail: enquiries@e2vtechnologies.com Internet: www.e2vtechnologies.com Holding Company: Redwood 2002 Limited E2V Technologies Inc. 4 Westchester Plaza, PO Box 1482, Elmsford, NY10523-1482 USA Telephone: (914) 592-6050 Facsimile: (914) 592-5148 e-mail: enquiries@e2vtechnologies.us
# E2V Technologies Limited 2002
A1A-CX1151 Issue 4, September 2002
527/5626
MAXIMUM AND MINIMUM RATINGS
(Continued)
Min Max
Grid 2
Unloaded grid 2 drive pulse voltage (see note 6) . . . . . . . Grid 2 pulse duration . . . . . Rate of rise of grid 2 pulse (see note Grid 2 pulse delay . . . . . . Peak inverse grid 2 voltage . . . Loaded grid 2 bias voltage . . . Forward impedance of grid 2 drive circuit . . . . . . . 5) . . . . 300 1000 V . 1.0 - ms . 1.0 - kV/ms . 0.5 3.0 ms .- 450 V 750 7150 V 50 800 O
Grid 1 - DC Primed (See note 7)
DC grid 1 unloaded priming voltage . DC grid 1 priming current . . . . 75 50 150 100 V mA
Grid 1 - Pulsed
Unloaded grid 1 drive pulse voltage (see note 6) . . . . . . . Grid 1 pulse duration . . . . . Rate of rise of grid 1 pulse (see note Peak inverse grid 1 voltage . . . Loaded grid 1 bias voltage . . . Peak grid 1 drive current ... . . 5) . . . 300 1000 V . 2.0 - ms . 1.0 - kV/ms .- 450 V . . . . see note 8 . 0.3 1.0 A
Cathode
Heater voltage . . . . . . . . . Tube heating time . . . . . . . . 6.3 + 5% 5.0 - V min
Environmental
Ambient temperature . . . . . . 750 Altitude . . . . . . . . . . . - - +90 3 10 000 8C km ft
4. The peak inverse voltage must not exceed 25 kV for the first 25 ms after the anode pulse. 5. This rate of rise refers to that part of the leading edge of the pulse between 25% and 75% of the pulse amplitude. 6. Measured with respect to cathode. In certain cases the maximum drive pulse voltage may be exceeded without damage to the tube; a maximum value of 2.5 kV is then recommended. When grid 1 is pulse driven, the last 0.25 ms of the top of the grid 1 pulse must overlap the corresponding first 0.25 ms of the top of the delayed grid 2 pulse. 7. When DC priming is used on grid 1, a negative bias of 100 to 200 V must be applied to grid 2 to ensure anode voltage hold-off. DC priming is recommended for crowbar service. 8. DC negative bias voltages must not be applied to grid 1. When grid 1 is pulse driven, the potential of grid 1 may vary between 710 and +5 V with respect to cathode potential during the period between the completion of recovery and the commencement of the succeeding grid pulse. 9. Typical figures are obtained on test using conditions of minimum grid drive. Improved performance can be expected by increasing the grid drive. 10. The time interval between the instant at which the rising unloaded grid 2 pulse reaches 25% of its pulse amplitude and the instant when anode conduction takes place. 11. The drift in delay time over a period from 10 seconds to 10 minutes after reaching full voltage. 12. For equipment where jitter and anode delay time drift are not important, the tube may be triggered by applying a single pulse to grid 2 and connecting grid 1 to grid 2 via a 1000 pF capacitor shunted by a 0.1 MO resistor. 13. The recovery characteristics are controlled on a sampling basis.
HEALTH AND SAFETY HAZARDS
E2V Technologies hydrogen thyratrons are safe to handle and operate, provided that the relevant precautions stated herein are observed. E2V Technologies does not accept responsibility for damage or injury resulting from the use of electronic devices it produces. Equipment manufacturers and users must ensure that adequate precautions are taken. Appropriate warning labels and notices must be provided on equipments incorporating E2V Technologies devices and in operating manuals.
CHARACTERISTICS
Min Typical Max Critical DC anode voltage for conduction (see note 9) . . Anode delay time (see notes 9 and 10) . . . Anode delay time drift (see notes 9, 11 and 12) . . Time jitter (see notes 9 and 12) Recovery time . . . . . . Heater current (at 6.3 V) .. .- .- 0.5 0.15 2.0 0.25 kV ms
.- 20 50 ns .- 1.0 5.0 ns . . see note 13 and curves 18 22 25 A
High Voltage
Equipment must be designed so that personnel cannot come into contact with high voltage circuits. All high voltage circuits and terminals must be enclosed and fail-safe interlock switches must be fitted to disconnect the primary power supply and discharge all high voltage capacitors and other stored charges before allowing access. Interlock switches must not be bypassed to allow operation with access doors open.
RATINGS FOR SINGLE SHOT OR CROWBAR SERVICE (See note 7)
DC forward anode voltage . . . . . Peak anode current . . . . . . . Product of peak current and pulse length Repetition frequency . . . . . . . . 30 kV max . 15 kA max . . 0.6 A.s max 1 pulse per 10 s max
X-Ray Radiation
All high voltage devices produce X-rays during operation and may require shielding. The X-ray radiation from hydrogen thyratrons is usually reduced to a safe level by enclosing the equipment or shielding the thyratron with at least 1.6 mm ( 1/16 inch) thick steel panels. Users and equipment manufacturers must check the radiation level under their maximum operating conditions.
NOTES
1. The tube must be mounted by the base flange only. 2. A large area anode connector, E2V Technologies type MA360A, is recommended. 3. The maximum permissible peak forward voltage for instantaneous starting is 20 kV and there must be no overshoot.
CX1151, page 2
# E2V Technologies
MAXIMUM RECOVERY CHARACTERISTICS
80
2917B
PEAK ANODE CURRENT 1000 A RE-APPLIED ANODE VOLTAGE 1 kV
70 GRID 2 VOLTAGE 0 V
60
50 712.5 40
725
MAXIMUM RECOVERY TIME (ms)
30 750
20
7100
10
0 100
500
1000
5000
10 000
50 000
GRID 2 RECOVERY IMPEDANCE (O)
SCHEMATIC DIAGRAM
7027
GRID 2 DELAYED WITH RESPECT TO GRID 1 GRID 2 VOLTAGE 300 - 1000 V, 1 ms
G2
R2
0
NEGATIVE BIAS VOLTAGE
G1
CATHODE HEATER SUPPLY
R1
GRID 1 CURRENT 0.3 - 1.0 A, 2 ms 0.5 ms MIN GRID 1/GRID 2 DELAY
RECOMMENDED GRID AND CATHODE HEATER CONNECTIONS
R1 = Grid 1 series resistor. 12 W vitreous enamelled wirewound is recommended, of a total impedance to match the grid 1 drive pulse circuit. R2 = Grid 2 resistor. 12 W vitreous enamelled wirewound is recommended, of an impedance to match the grid 2 drive pulse circuit. Components R1 and R2 should be mounted as close to the tube as possible.
# E2V Technologies
CX1151, page 3
OUTLINE
(All dimensions without limits are nominal)
4900B
1K
Ref A B C D E F G H J K L
Millimetres 301.0 max 84.12 max 215.9 + 13.0 111.1 95.25 1.6 6.5 215.9 6.35 14.38 + 0.18 12.7 min
Inches 11.850 max 3.312 max 8.500 + 0.512 4.375 3.750 0.063 0.256 8.500 0.250 0.566 + 0.007 0.500 min
L
1B A
Inch dimensions have been derived from millimetres.
C
Outline Notes
1. The recommended hole in the mounting plate is 76 mm (3.0 inches) diameter. 2. A minimum clearance of 44.45 mm (1.75 inches) must be allowed below the mounting surface. 3. The mounting flange is the cathode connection and this is connected internally to the mid-point of the heater.
SEE NOTE 3 F
SEE NOTE 1
SEE NOTE 2
GRID 1 LEAD (GREEN) H LONG, TAG TO SUIT 1J 3 HOLES 1G EQUISPACED ON E PCD GRID 2 LEAD (WHITE) H LONG, TAG TO SUIT 1J a g2 Cap
5536A
g1 1D k, hct Flange Reservoirs (internal) CATHODE HEATER LEADS (YELLOW) H LONG, TAGS TO SUIT 1J h h
Whilst E2V Technologies has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any use thereof and also reserves the right to change the specification of goods without notice. E2V Technologies accepts no liability beyond that set out in its standard conditions of sale in respect of infringement of third party patents arising from the use of tubes or other devices in accordance with information contained herein.
CX1151, page 4
Printed in England
# E2V Technologies

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