ETC1 CX1622 Deuterium thyratron Datasheet

E2V Technologies
CX1622
Deuterium Thyratron
The data to be read in conjunction with the Hydrogen
Thyratron Preamble.
ABRIDGED DATA
Deuterium-filled, flange mounted tetrode thyratron featuring
high peak current, high rate of rise of current, low jitter and low
anode delay time drift. It has been specifically designed to
switch discharge circuits for pulsed lasers and for switching
long pulses. It has an internally connected reservoir operated
from the cathode heater supply and an internal shield to
minimise X-ray emission from the region of the anode.
Peak forward anode voltage . . . . . .
35
kV max
Peak forward anode current . . . . . . . 5.0 kA max
Average anode current . . . . . . . . 0.5
A max
Rate of rise of current . . . . . . . .
50 kA/ms max
Pulse repetition rate . . . . . . . . 200
pps max
GENERAL DATA
Electrical
Cathode (connected internally
mid-point of heater) . . .
Heater voltage . . . . .
Heater current . . . . .
Tube heating time (minimum)
to
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. . oxide coated
. . 6.3 + 5% V
.
22
A
. . 5.0
min
Mechanical
Seated height . . . . . 304.8 mm (12.000 inches) max
Clearance required below
mounting flange . . . . . 44.45 mm (1.750 inches) min
Overall diameter (excluding
mounting flange)
. . .
84.12 mm (3.312 inches) max
Net weight . . . . . . . 0.7 kg (1 1/2 pounds) approx
Mounting position (see note 1) . . . . . . . . . any
Top cap connector (see note 2) . . . . . B.S.448-CT3
Cooling (see note 3) . . . . . . . . . .
forced-air
MAXIMUM AND MINIMUM RATINGS
(Absolute values)
Min
Max
Min
Anode (Pulse Laser Service)
Peak forward anode voltage
(see note 4) . . . . .
Peak inverse anode voltage
(see note 5) . . . . .
Peak forward anode current .
Average anode current . .
Rate of rise of anode current
(see notes 6 and 7) . . .
Pulse repetition rate . . .
Max
Anode (Pulse Modulator Service)
. . . . –
35
kV
. . . . –
. . . . –
. . . . –
25
5.0
0.25
kV
kA
A
. . . . –
. . . . –
50
50
kA/ms
pps
Peak forward anode voltage
(see note 4) . . . . .
Peak inverse anode voltage
(see note 5) . . . . .
Peak forward anode current .
Average anode current . .
Rate of rise of anode current
(see notes 6 and 7) . . .
Pulse repetition rate . . .
. . . . –
35
kV
. . . . –
. . . . –
. . . . –
25
5.0
0.5
kV
kA
A
. . . . –
. . . . –
5.0 kA/ms
200
pps
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: E2V Holdings 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-CX1622 Issue 5, October 2002
527/5640
MAXIMUM AND MINIMUM RATINGS
NOTES
(Continued)
Min
Max
Grid 2 (See note 7)
Unloaded grid 2 drive pulse
(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 . .
voltage
. . . . 600
. . . . . 0.5
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
2000
–
V
ms
. 1.0
–
kV/ms
. 0
3.0
ms
. –
450
V
750 7200
V
. . . .
50
200
O
Grid 1 – Pulsed (See note 7)
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
. . . . . 0.3
voltage
. . . . 300
. . . . . 1.0
1.0
2000
–
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
50
150
100
V
mA
1. The tube must be fitted using its mounting flange.
2. A large area anode connector, E2V Technologies type
MA360A, is recommended.
3. Cooling of the anode stem is necessary under conditions of
high voltage and high anode dissipation in order to avoid
damage to the tube.
4. The maximum permissible peak forward voltage for
instantaneous starting is 25 kV and there must be no
overshoot.
5. The peak inverse voltage must not exceed 10 kV for the
first 25 ms after the anode pulse. Amplitude and rate of rise
of inverse voltage contribute greatly to tube dissipation and
electrode damage; if these are not minimised in the circuit,
tube life will be shortened considerably. The aim should be
for an inverse voltage of 3 – 5 kV peak with a rise time of
0.5 ms.
6. This rate of rise refers to that part of the leading edge of
the pulse between 10% and 90% of the pulse amplitude.
7. For applications requiring the highest rate of rise of anode
current, grid 1 should be pulse driven. Maximum grid drives
should be used, the rate of rise of grid 2 trigger pulse
should be as high as possible and the grid 2 pulse delay
should be 0.2 ms min.
For less severe applications, good results can be obtained
by driving both grids from a single pulse using the circuit
shown in Fig. 1.
5502A
1.0 kV
100 O
GRID 2
Cathode
0.5 ms
Heater voltage . . . . . . . . .
Tube heating time . . . . . . . .
6.3 + 5%
5.0
–
V
min
0.1 mF
1.0 kO
GRID 1
Environmental
Ambient temperature . . . . . . 750
Altitude . . . . . . . . . . . –
–
+90
3
10 000
8C
km
ft
Min Typical Max
CX1622, page 2
CATHODE
Fig. 1 Circuit for single pulse drive
CHARACTERISTICS
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) . .
Heater current (at 6.3 V)
.
10 kO
. . –
0.5
2.0
kV
. . –
0.15
0.25
ms
. . –
. . –
.
18
20
1.0
22
50
5.0
25
ns
ns
A
8. Measured with respect to cathode. 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.
9. When DC priming is used on grid 1, a negative bias of 100 V
to 200 V must be applied to grid 2 to ensure anode voltage
hold-off.
10. DC negative bias voltages must not be applied to grid 1.
The potential of grid 1 may vary between 710 V 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.
#E2V Technologies
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
304.8 max
84.12 max
215.9 + 13.0
111.1
95.25
1.6
6.5
381.0
6.35
14.38 + 0.18
12.70 min
12.000 max
3.312 max
8.500 + 0.512
4.375
3.750
0.063
0.256
15.000
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 (1.750 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
1D
CATHODE HEATER LEADS (YELLOW)
H LONG, TAGS TO SUIT 1J
#E2V Technologies
CX1622, page 3
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.
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.
CX1622, page 4
Printed in England
#E2V Technologies
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