CX1174 반도체 회로 부품 판매점
Deuterium-Filled Ceramic Thyratron
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E2V Technologies
CX1174
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 (see Ratings) . . . . . 6.0 kA max
Average anode current . . . . . . . . 4.0 A max
GENERAL
Electrical
Cathode (connected internally to
one end of heater) . . . . . . . . . oxide coated
Cathode heater voltage
.
.
.
.
.
.
.
.
6.3
+
7
0.3
0.0
V
Cathode heater current . . . . . . . 40
A
Reservoir heater voltage (see note 1) . . . . 5.0
V
Reservoir heater current . . . . . . . 10
A
Tube heating time (minimum) . . . . . 15
min
Anode to grid 2 capacitance . . . . . 40
pF
Mechanical
Seated height . . . . . 212.7 mm (8.375 inches) max
Clearance required below
mounting flange . . . . . 57.15 mm (2.250 inches) min
Overall diameter
(mounting flange) . . . 152.4 mm (6.000 inches) nom
Net weight . . . . . . . 3.5 kg (7 3/4 pounds) approx
Mounting position (see note 2) . . . . . . . . . any
Tube connections . . . . . . . . . . . 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 300 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 grid . . . . . . 150
cathode flange and base . . . . . . 120
8C max
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-CX1174 Issue 5, October 2002
DataSheet4 U .com
527/5630
www.DataSheet4U.com
MAXIMUM AND MINIMUM RATINGS
These ratings cannot necessarily be used simultaneously, and
no individual rating must be exceeded.
Min Typical Max
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
(see note 7) . . . . . . . –
– 40
– 35
6.0 –
kV
kV
kA
– 8.0 kA
– 4.0 A
10 – kA/ms
400 – pps
Min Max
Anode (Single Shot, see note 8)
DC forward anode voltage . . . . . – 30 kV
Peak anode current . . . . . . . – 40 kA
Rate of rise of anode current . . . . . . . see note 5
Total conducted charge:
capacitor discharge . . . . . . –
0.4 C
power supply follow-on . . . . . –
18
C
Repetition frequency . . . . . . . 1 pulse per 10 s max
Grid 2
Unloaded grid 2 drive pulse voltage
(see note 9) . . . . . . . . 500 2000
V
Grid 2 pulse duration . . . . . . . 0.5 –
ms
Rate of rise of grid 2 pulse
(see note 6) . . . . . . . . 10
– kV/ms
Grid 2 pulse delay . . . . . . . . 0.5 3.0 ms
Peak inverse grid 2 voltage . . . . . – 450
V
Loaded grid 2 bias voltage . . . . 750 7180
V
Forward impedance of
grid 2 drive circuit . . . . . . 50 500
O
Grid 1 – Pulsed
Unloaded grid 1 drive pulse voltage
(see note 9) . . . . . . . . 400 1000
V
Grid 1 pulse duration . . . . . . . 2.0 –
ms
Rate of rise of grid 1 pulse
(see note 6) . . . . . . . . . 1.0 – kV/ms
Peak inverse grid 1 voltage . . . . . – 450
V
Loaded grid 1 bias voltage . . . . . . . . see note 10
Peak grid 1 drive current . . . . . 0.5 1.5 A
Grid 1 – DC Primed (See note 11)
DC grid 1 unloaded priming voltage . 75
DC grid 1 priming current . . . . 75
150
150
V
mA
Cathode
Heater voltage . . . . . . . . .
6.3
+
7
0.3
0.0
Heating time . . . . . . . . 15
–
V
min
Reservoir
Heater voltage (see note 1) . . . . . 4.5
Heating time . . . . . . . . 15
6.5 V
– min
Environmental
Ambient temperature . . . . . . 750 +90
Altitude . . . . . . . . . . . –
3
– 10 000
8C
km
ft
CHARACTERISTICS
Min Typical Max
Critical DC anode voltage for
conduction (see note 12) . . . –
0.5 1.0 kV
Anode delay time
(see notes 12 and 13) . . . . –
0.1 0.25 ms
Anode delay time drift
(see notes 12 and 14) . . . . – 15 50
ns
Time jitter (see note 12) . . . . –
1.0 5.0 ns
Recovery time . . . . . . . . . . . . see note 7
Cathode heater current
(at 6.3 V) . . . . . . . 35 40 45
A
Reservoir heater current
(at 5.0 V) . . . . . . . . 8.0 10 12
A
NOTES
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 mounted by means of its mounting
flange.
3. Under resonant charging conditions a maximum anode
voltage of 35 kV is recommended. Using command
charging techniques, where the voltage appears at the
anode for only a short time (51 ms), this thyratron may be
operated at up to 40 kV.
4. The peak inverse voltage including spike 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.
5. For single-shot or burst mode applications this parameter
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. This thyratron has a long recovery time (50 – 100 ms). The
amount of time available for thyratron recovery must be
maximised by circuit design, and reliable operation may
necessitate the use of command charging techniques. The
amount of time required for recovery is affected by gas
pressure, peak current, pulse duration and load mismatch
which keeps the thyratron in a conducting state.
CX1174, page 2
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