ETC CX1151

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
kV
. . –
. . –
25
1.0
kV
kA
. . –
. . –
2.0
1.25
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: [email protected] 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: [email protected]
# 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
150
100
V
mA
Grid 1 – DC Primed (See note 7)
DC grid 1 unloaded priming voltage .
DC grid 1 priming current . . . .
75
50
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
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
2.0
kV
. –
0.15
0.25
ms
. –
20
50
ns
. –
1.0
5.0
ns
. . see note 13 and curves
18
22
25
A
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
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
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.
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.
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.
# 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
MAXIMUM RECOVERY TIME (ms)
40
725
30
750
20
7100
10
0
100
500
1000
5000
10 000
50 000
GRID 2 RECOVERY IMPEDANCE (O)
SCHEMATIC DIAGRAM
GRID 2 DELAYED
WITH RESPECT TO GRID 1
7027
GRID 2 VOLTAGE
300 – 1000 V,
1 ms
G2
R2
G1
R1
CATHODE
HEATER
SUPPLY
0
NEGATIVE BIAS VOLTAGE
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)
1K
4900B
L
1B
A
Ref
Millimetres
Inches
A
B
C
D
E
F
G
H
J
K
L
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
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
Inch dimensions have been derived from millimetres.
Outline Notes
C
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
a
GRID 2 LEAD (WHITE)
H LONG, TAG TO SUIT 1J
5536A
Cap
g2
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