Capability

Full Regulation to 2 Megawatts of Anode Dissipation

Negative-Grid Operation

Liquid Cooled
The BURLE S94000E is designed especially for high-
power,
very-long
pulse
switch
and
regulator
applications. It is a liquid-cooled, ceramic-metal beam
power tetrode that utilizes thoriated-tungsten filaments
in a circular-array of unit electron-optical systems
surrounding a centrally located anode. The tube has the
capability of supplying high current to a uniquely
designed anode structure with negative voltage applied
to grid No.1.
This bulletin gives information unique to the BURLE
S94000E
tube,
in
addition,
accessories
for
the
installation of the tube are available from BURLE.
General information, covering the installation and
operation of this tube is given in Application Guide for
BURLE
Power
Tubes,
TP-105
and
S94000E
Installation and Operating Instructions.
Close attention to the data and information contained in
these publications will assure longer tube life, safer
operation, less equipment downtime, and fewer tube
handling accidents. For copies of these publications,
contact your BURLE Representative or write BURLE
INDUSTRIES,
INC.,
1000
New
Holland
Avenue,
Lancaster, PA 17601-5688.
General Data
Electrical
Filament
Type
Multistrand Thoriated Tungsten
Current, DC...
4200
typ.
A
Current, DC...
4700
max.
A
Starting Current
(must never exceed)..
5000
max.
A
Voltage at 4200A.
3.5
typ.
V
Minimum time to reach operating voltage
2
min.
Mu-Factor, (Grid No.1 to Grid No.2)...
9
typ.
Direct Interelectrode Capacitances:
Grid No.1 to anode.
0.7
pf
Grid No.1 to grid No.2 and cathode (input)
2000
pf
Anode to grid No.2 and cathode (output)
80
pf
Grid No.2 to cathode ..
1700
pf
Mechanical
Operating Attitude
Tube Axis Vertical
Operating Environment.
Above 125 kV the anode terminal
and ceramic insulator must be
immersed in oil or pressurized gas
Overall Length (Typ.) ...
0.914 m (36 in)
Maximum Diameter (Typ.).
0.565 m (22.25 in)
Weight (Typ.)
Uncrated.
Crated
147 kg (325 lbs)
394.625 kg (870 lbs)
Dimensions and Terminal
Connections..
See Outline Drawing
Thermal
Maximum Ceramic Temperature 150
°C
Maximum Metal Temperature. 150
°C
Minimum Storage Temperature
1
-65
°C
Maximum External Gas
Pressure, Absolute.. (2.1 bars) 30
PSI
Return To Product Page 2
Switch/Regulator Service
For a maximum On time of 10 seconds in any 1 minute interval.
Maximum Ratings, Absolute-Maximum Values
See Figure 1).
DC Anode Voltage
..
200
kV
Peak Anode Current 90
A
Anode Dissipation
.
2000
kW
Dc Grid No.1 DC Voltage -1000
V
DC Grld-No.2 Voltage
.
2.0
kV
Peak Grld-No.2 Current
.
8.0
A
Grid-No.1 Dissipation
2.3 Grld-No.2 Dissipation
2
.
3
.
10
10
kW
kW
Typical Operation
Switch-Tube Service
Pulse Length = 10 seconds. Repetition Rate = 1 per minute.
DC Anode Voltage
190
120 kV
Peak Anode Current .
90
65
A
DC Grid-No.2 Voltage...
1.5
1.5 kV
Peak Orid-No.2 Current.
3.5
1.0
A
DC Grid-No.1 Voltage.
-500
-500
V
Grid-No.1 Voltage During Pulse
-35
-60
V
Output (Load) Voltage During Pulse.
180
112 kV
Regulator Service
DC Anode Voltage Range....
175 to 182 105 kV
Peak Anode Current..
90
65
A
DC Grid-No.2 Voltage...
1.5
1.5 kV
Peak Orid-No.2 Current....
3.0
1.0
A
DC Grid-No.1 Voltage...
-500 -500
V
Grid.-No.1 Voltage During Pulse..
-35
-60
V
Output (Load) Voltage During Pulse.
160
90 kV
Cut-Off Conditions
DC Anode Voltage..
200
kV
DC Anode Current..
10
mA
DC Grid-No.2 Voltage
1.0
kV
DC Grid-No.1 Voltage
-200
V
Electrical Considerations
Filaments
A DC filament supply is required. Filament excitation
with
an
AC
supply
may
generate
mechanical
resonances in the filament structure. A three-phase,
full-wave rectifier supply is recommended.
Protection Circuitry
Protection circuits are necessary to protect the tube in
the event of a flash-arc within the vacuum enclosure
when the tube is handling high energy.
All power supplies that are capable of supplying more
than 5 Joules of energy to the tube terminals should be
equipped
with high-speed fault protection. A full
explanation of fault protection requirements is covered
in Application Guide for BURLE Power tubes, TP-105.
In addition, a spark gap is required between grid No.2
and the cathode.
Ion Pump
Pumping Speed..
8 liter/sec
Controller Unit..
Varian No. 9210015, or equivalent
Cooling
4
Liquid Cooling
Liquid cooling of the filament, grid No.1, grid No.2,
filament ground, and the anode are required prior to the
application of power to the filament. Interlocking of
coolant flow through each element is required.
Normal procedure is to allow the coolant flow to remain
flowing for approximately one minute after all voltages
have been terminated from the tube. Under emergency
conditions, the coolant flow and tube voltages may be
terminated simultaneously.
Liquid Pressure Data
Any Inlet Except Mode ...
(6.9 bars) 100 max.
psi
Anode Inlet .
(7.6 bars) 110 max.
psi
Anode Outlet
(1.4 bars)
20 min.
psi
Resistivity of Water at 25ºC 1.5
min.
Mohm cm
Water Temperature at Any Outlet.
70
min.
°
C
Water Temperature at Anode Inlet 35
max.
°
C
Filament, Grid No.1, Grid No.2, Filament Ground,
and Anode Flow vs. Pressure Drop for Water
Coolant
Course
Minimum
Flow
(I/m) gpm
Typical Flow
(l/M) gpm
Maximum
DiffrI
Pressure
at Typical
Flow
(bars) psi
Anode:
To 1 Mega W
Dissipation
(567.8) 150
(605.6) 160
(1.4) 20
To 2 Mega W
Dissipation
(946.2) 250
(984.1) 260
(4.1) 60
Filament
(10.6) 2.8
(11.3) 3
(2.1) 30
Filament
Ground
(6.8) 1.8
(7.6) 2
(2.1) 30
Grid No.1
5
(6.8) 1.8
(7.6) 2
(2.1) 30
Grid No.2
(6.8) 1.8
(7.6) 2
(2.1) 30
Anode-Ceramic Cooling
In applications where the anode ceramic is not
immersed in oil, a flow of air or gas such as SF6 at a
rate of 20 cfm (0.0094 m
3
/s) may be required to
maintain ceramic temperature below 150
°
C.
Notes
1. The tube cooling channels must be free of water before
storage.
2. Peak dissipation during the pulse.
3. The power specified includes the filament power that is
absorbed by the grids. The grid-No.1 absorbs approx.
40% and grid-No.2 absorbs approx. 20% of the filament
power.
4. For additional information on liquid cooling, refer to
"Application Guide for BURLE Power Tubes, TP-105.
5. The grid No.1 coolant course should not be connected in
series with any other electrode coolant course
.
Return To Product Page 3
Accessories
The accessories tabulated below and depicted on page 4
for operating the S94000E switch tube are available from
BURLE. These accessories can be fabricated by the user
from detailed Specifications given in the Application
Guide,
"S946000E
Installation
and
Operating
Instructions.
Accessory (See Figure 4)
Quantity
Required
BURLE Order
Number
Manufacturer and Number
Coolant Fittings for:
Grid No.1, grid No.2, and filament ground:
Fitting.
3
C94804E
-
Clamp.
3
-
Aeroquip Marman No.24502-150
O-Ring
6
-
Parker No.2-Oil, Compound N674-70
Filament:
Fitting.
2
C94801E
-
Clamp.
2
-
Aeroquip Marman No24502-200
O-Ring
2
-
Parker No.2-227, Compound N674-70
Anode:
Fitting.
2
C94802E
-
Clamp.
2
-
Aeroquip Marman No.24502-225
O-Ring
2
-
Parker No.2-229, Compound N674-70
Mounting Plate/Filament Return (Ground) for Tube:
Plate.
1
*
O-Ring.
1
-
Parker No.2-468, Compound N674-70
Pressure Sealing Sleeve for Mode (Not
Required for All Applications):
Sleeve.
1
C94803E
Parker No.2-364, Compound N674-70
Stand for Mounting Tube Accessories:
Stand .
1
* For information on this accessory, contact BURLE Power Applications Engineering, Lancaster, PA 17601-5688.
Figure 1 - Operating Region for S94000E Switch Tube
Warning - Personal Safety Hazards
Electrical Shock - Operating voltages applied to this
device present a shock hazard.
X-Ray Warning - This device in operation may
produce X-rays which can constitute a health hazard
unless the device is adequately shielded for
radiation.
Return To Product Page 4
Pressure Sealing Sleeve
(Not shown on assembly,
not required for all
applications)
Coolant Fitting for Plate
(Not shown on assembly)
Mounting Plate/Filament
Return (Ground)*
Stand* for Mounting Tube
Accessories Coolant Fitting for Grid No. 1, Grid
No. 2, and Filament Ground
Coolant Fitting for Filament
Return To Product Page 5
Figure 2 - Typical Constant Current Characteristics
(E
c2
= 1250V)
Figure 3 - Typical Constant Current Characteristics
(E
c2
= 1500 V)
Return To Product Page 6
Note 1 - Mating flange Aeroquip Marman No.4560-225, O-Ring
Parker
No.2-229,
Clamp
Aeroquip
Marman
No.24502-225,
suggested connector BURLE No.C94802E.
Note 2- (16)3/8-16 x 3/8 deep tapped holes, equally spaced on
18.5 ± 0.02 (469.9 ± 0.37 mm) B.C
Note 3- Clamp Aeroquip Marman No.24502-150S, O-Ring Parker
No.2-Oil, suggested connector BURLE No.C94804E.
Note 4-Clamp Aeroquip Marman No.24502-200, O-Ring Parker
No.2-227, suggested connector BURLE No.C94801E.
Note 5 - Mates with Varian/NRC cable model No.924-0750,
Power Supply Varian/NRC Model No.921-0015 or equivalent.
Tabulated
Dimensions
Dimensions
Inches
Millimeters
A
17.81± 0.2
(452.37 ± 5.08)
B
15.07± 0.2
(382.78 ± 5.08)
C Dia.
22.25
(565.15)
Max.
D Dia.
20.5± 0.2
(520.7 ± 5.08)
E Dia.
11.62±0.1
(295.15±2.54)
F
18.18± 0.2
(461.77 ± 5.08)
G Dia.
17.12
(434.85)
Max.
H
1.00
(25.4)
Ref.
J
0.98
(24.89)
Ref.
K
1.83
(46.48)
Ref.
L
15.9± 0.2
(403.86 ± 5.08)
M
1.25
(31.75)
Max.
N
2 ± 0.1
(50.8 ± 2.54)
0
6 ± 0.1
(152.4 ± 2.54)
P
5.25± 0.1
(133.35 ± 2.54)
0
3 ± 0.1
(76.2 ± 2.54)
R
3.25± 0.1
(82.55 ± 2.54)
S
7.25 ± 0.1
(184.15 ± 2.54)
T
7.5º
7.5°
Ref.
U
5.25± 0.1
(133.35 ± 2.54)
V
3 ± 0.1
(76.2 ± 2.54)
W
5
(127)
Ref.
X
3.75
(95.25)
Ref.
Y
1.62
(41.15)
Ref.
BB
3.5
(88.9)
Ref.
CC
2 ± 0.06
(50.8 ± 1.52)
DD
16.08± 0.15
(408.43 ± 3.81)
Figure 4 - Dimensional O