E2V Technologies CX1154 Deuterium Filled Ceramic Thyratron ABRIDGED DATA

E2V Technologies CX1154 Deuterium Filled Ceramic Thyratron ABRIDGED DATA
E2V Technologies
CX1154
Deuterium Filled Ceramic Thyratron
The data to be read in conjunction with the Hydrogen
Thyratron Preamble.
ABRIDGED DATA
Deuterium-filled tetrode thyratron with ceramic/metal
envelope, featuring low jitter, firing time and drift. Suitable for
switching high power at high pulse repetition rates or for
switching long pulses. A reservoir operating from a separate
heater supply is incorporated.
Peak forward anode voltage . . . . . .
40
kV max
Peak anode current . . . . . . . . . 3.0 kA max
Average anode current . . . . . . . . 2.0
A max
GENERAL DATA
Electrical
Cathode (connected internally
to one end of heater) . . . . . . . .
Cathode heater voltage
. . . . . .
Cathode heater current . . .
Reservoir heater voltage (see note
Reservoir heater current . . .
Tube heating time (minimum) .
Anode to grid 2 capacitance
.
.
1)
.
.
.
.
.
.
.
.
.
.
.
.
oxide coated
+ 0.5
. . 6.3
V
7 0.0
.
22.5
A
. . 5.0
V
. . 7.0
A
.
15
min
15 to 20
pF
Mechanical
Seated height . . . .
Clearance required below
mounting flange . . .
Overall diameter
(mounting flange) . .
Net weight . . . . .
Mounting position (see note
Tube connections . . .
.
. .
165.1 mm (6.500 inches) max
38.1 mm (1.500 inches) min
.
111.1 mm (4.375 inches) nom
. . . 1.8 kg (4 pounds) approx
2) . . . . . . . . . any
. . . . . . . . see outline
Cooling . . . . . . . . . . . liquid or forced-air
Liquid . . . . . . . . . . oil or coolant immersion
Forced-air . . . . . . . . . . . . . . see below
Cooling by oil or coolant immersion is preferred in view of the
high voltages present. Further information is contained in the
relevant section of the Preamble.
The tube may be cooled by forced-air directed mainly onto the
base, and the metal/ceramic envelope should be maintained
below the maximum rated temperature. An air flow of at least
2.83 m3/min (100 ft3/min), depending on the mechanical
layout, will be necessary to keep the tube operating
temperatures under the limits specified below.
In addition to 200 W of heater power, the tube dissipates from
100 W per ampere average anode current, rising to 300 W/A at
the highest rates of rise and fall of anode current.
The cathode end of the tube must be cooled whenever heater
voltages are applied, since the cathode flange will reach a
temperature of 120 8C above ambient in the absence of cooling.
Envelope temperature:
ceramic, anode and grids . . . . . . 150
8C max
cathode flange and base . . . . . . 120
8C max
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-CX1154 Issue 4, September 2002
527/5626
Reservoir
MAXIMUM AND MINIMUM RATINGS
(Absolute values)
These ratings cannot necessarily be used simultaneously, and
no individual rating must be exceeded.
Min Typical Max
–
–
40
kV
–
–
–
3.0
35
–
kV
kA
–
–
–
–
–
–
10
400
Min
4.0
2.0
kA
A
– kA/ms
–
pps
Max
Anode (Single-Shot)
DC forward anode voltage .
Peak anode current . . .
Rate of rise of anode current
Total conducted charge:
capacitor discharge . .
power supply follow-on
(see note 7) . . . . .
Repetition frequency . . .
. . . .
–
. . . .
–
. . . . . . .
30
kV
10
kA
see note 5
–
0.1
C
. . . .
–
4
C
. . . . 1 pulse per 10 s max
Unloaded grid 2 drive pulse voltage
(see note 8) . . . . . . .
Grid 2 pulse duration . . . . .
Rate of rise of grid 2 pulse
(see note 6) . . . . . . .
Grid 2 pulse delay . . . . . .
Peak inverse grid 2 voltage . . .
Loaded grid 2 bias voltage . . .
Forward impedance of grid 2
drive circuit (see note 9) . . .
. . 500
. .
0.5
2000
–
V
ms
. . 10
– kV/ms
. .
0.5
3.0
ms
. .
–
450
V
.
750 7200
V
. .
50
500
O
Grid 1 – Pulsed
. . . . .
0.3
voltage
. . . . . 300
. . . . .
2.0
1.0
1000
–
A
V
ms
. . . . .
1.0
– kV/ms
. . . . .
–
450
V
. . . . . . . . see note 10
Grid 1 – DC Primed (See note 9)
DC grid 1 unloaded priming voltage . .
DC grid 1 priming current . . . . .
75
75
150
150
V
mA
Cathode
Heater voltage . . . . . . . . .
Heating time
. . . . . . . . .
CX1154, page 2
6.5
–
V
min
Environmental
+90
3
10 000
8C
km
ft
CHARACTERISTICS
Min Typical Max
Critical DC anode voltage for
conduction (see note 11) .
Anode delay time
(see notes 11 and 12) . .
Anode delay time drift
(see notes 11 and 13) . .
Time jitter (see note 11) . .
Cathode heater current
(at 6.3 V) . . . . . .
Reservoir heater current
(at 5.0 V) . . . . . .
. .
–
0.5
1.0
. .
–
0.1
0.25 ms
. .
. .
–
–
15
1.0
50
5.0
ns
ns
. . 20
22.5
25
A
. .
6.0
7.0
8.0
kV
A
NOTES
. . . .
Grid 2
Peak grid 1 drive current
Unloaded grid 1 drive pulse
(see note 8) . . . .
Grid 1 pulse duration . .
Rate of rise of grid 1 pulse
(see note 6) . . . .
Peak inverse grid 1 voltage
Loaded grid 1 bias voltage
4.5
15
Ambient temperature . . . . . .
750
Altitude . . . . . . . . . . .
–
–
Anode (Pulse Modulator Service)
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 notes 5 and 6) . . . . .
Pulse repetition rate . . . . .
Heater voltage (see note 1) . . . . .
Heating time
. . . . . . . . .
6.3
15
6.8
–
V
min
1. The reservoir heater must be decoupled with a suitable
capacitor to avoid damage by spike voltages. The recommended reservoir heater voltage for each individual tube is
stamped on the tube envelope. This recommended value is
determined for hold-off at the maximum anode voltage
under DC conditions. For lower voltages and modulator
operation the reservoir heater voltage should be increased
to a value consistent with voltage hold-off at the operating
level. Maximum reservoir voltage (i.e. maximum gas
pressure in the tube) is one prerequisite for maximum
thyratron life. The reservoir voltage should be stabilised to
+0.05 V.
2. The tube must be fitted using its mounting flange.
3. Under resonant charging conditions a maximum anode
voltage of 35 kV is recommended. Using command
charging conditions where the voltage appears at the
anode for only a short time (51 ms), this thyratron may
be operated up to 40 kV.
4. The peak inverse voltage including spike must not exceed
10 kV for the first 125 ms after the anode pulse.
5. In single shot or burst mode, this paramenter can exceed
150 kA/ms. The ultimate value which can be attained
depends to a large extent upon the external circuit.
6. This rate of rise refers to that part of the leading edge
of the pulse between 25% and 75% of the pulse amplitude.
7. Under fault conditions, most of the coulombs are often in
the power supply follow-on current, rather than the storage
capacitor discharge.
8. Measured with respect to cathode. Pre-pulsing of grid 1 is
recommended for modulator and high rate of rise of
current applications. 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.
#E2V Technologies
9. 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. Also the higher grid 1 is pulsed, the larger must
the grid 2 negative bias be, to prevent the tube firing on the
grid 1 pulse.
10. 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.
11. Typical figures are obtained on test using conditions of
minimum grid drive. Improved performance can be expected by increasing grid drive.
12. 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.
13. The drift in delay time over a period from 10 seconds to 10
minutes after reaching full voltage.
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 1/16-inch
(1.6 mm) thick steel panels.
Users and equipment manufacturers must check the radiation
level under their maximum operating conditions.
SCHEMATIC DIAGRAM
GRID 2 DELAYED
WITH RESPECT TO GRID 1
7032
GRID 2 VOLTAGE
500 – 2000 V,
1 ms
CATHODE
HEATER
SUPPLY
G2
R2
G1
R1
C1
0
NEGATIVE BIAS VOLTAGE
GRID 1 CURRENT
0.3 – 1.0 A,
2 ms
0.5 ms MIN
GRID 1/GRID 2 DELAY
RESERVOIR
HEATER
SUPPLY
C2
(VARIABLE)
RECOMMENDED GRID, CATHODE AND RESERVOIR 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 series resistor. 12 W vitreous enamelled wirewound is recommended, of an impedance to match the grid 2
drive pulse circuit.
C1, C2 7
reservoir protection capacitors with a voltage rating 5500 V;
C1 =
1000 pF low inductance (e.g. ceramic),
C2 =
1 mF (e.g. polycarbonate or polypropylene).
Components R1, R2, C1 and C2 should be mounted as close to the tube as possible.
#E2V Technologies
CX1154, page 3
OUTLINE
(All dimensions without limits are nominal)
2397C
1C
ANODE CONNECTION FITTED
WITH 1/4-20 UNC SCREW
L
GRID 2 CONNECTION
FITTED WITH
8-32 UNC SCREW
A
D
MOUNTING FLANGE
SEE NOTE 1
E
SEE NOTE 2
1F
SEE NOTE 3
Ref
Millimetres
Inches
A
B
C
D
E
F
G
H
J
K
L
165.1 max
111.13
101.6
2.54
50.8 min
69.85 max
190.5 min
6.35
6.50
95.25
85.73
6.500 max
4.375
4.000
0.100
2.000 min
2.750 max
7.500 min
0.250
0.256
3.750
3.375
Inch dimensions have been derived from millimetres.
GRID 1 LEAD (GREEN)
G LONG, TAG TO SUIT 1H
Outline Notes
6 HOLES 1J
EQUISPACED ON K PCD
1B
1. The mounting flange is the connection for the
cathode, cathode heater return and reservoir
heater return.
2. A minimum clearance of 38.1 mm (1.500 inches)
must be allowed below the mounting flange.
3. The recommended mounting hole is 73.0 mm
(2.875 inches) diameter.
RESERVOIR HEATER LEAD (RED)
G LONG, TAG TO SUIT 1H
CATHODE HEATER LEAD (YELLOW)
G LONG, TAG TO SUIT 1H
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.
CX1154, page 4
Printed in England
#E2V Technologies
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