M1466A

Ver.8
New Product Bulletin
S-band Magnetron
M1466A
M1466A is a mechanical tuned pulsed type S-band
magnetron intended for medical linear accelerator
application.
Frequency range ------- 2993 to 3002 MHz
(at cooling water 40℃)
Peak output power ------Magnet
-------
2.8MW
separate
GENERAL CHARACTERISTICS
----ELECTRICAL---Heater voltage (pre-heating)
Heater current (note 9)
Minimum preheat time
8.5 V
9.0 A
180sec
----MECHANICAL---Dimensions
see outline drawing
Net weight
8 kg approximately
Mounting position
Any
Cooling
Water cooling
M1466A is water cooled and has an integral water jacket.
The recommended water quality is pure grade.
The recommended water flow is 5 liters per minute or more; a pressure of
approximately 1.25 kg/cm2 will be necessary to give this rate of flow.
The output water temperature must not exceed 50 ℃.
Output coupling
Waveguide transition NJC1301F
All specifications are subject to change without notice.
New Japan Radio Co.,Ltd.
SHEET 1 OF 9
Ver.8
ABSOLUTE MAXIMUM RATINGS
These ratings cannot necessarily be used simultaneously and no individual
ratings should be exceeded.
Min
Max
Units
Magnetic field (note 4 and 5 )
100
157.5
mT
1000
1575
gauss
Heater voltage
8.0
10.0
V
Peak anode voltage
48
kV
－
Peak anode current
55
110
A
Average anode power input (note 2)
6
kW
－
Duty cycle
0.0015
－
Pulse duration
4.5
－
μs
Rate of rise of voltage pulse (note 6)
80
120
kV/μs
Output water temperature
－
50
℃
V.S.W.R. at the output coupler
Pressureing of waveguide (note 7)
－
－
1.5:1
3.1
－
kg/cm2
TEST CONDITIONS AND LIMITS
The tube is tested to comply with the following electrical specification:
Magnetic field (note 4 and 5 )
Heater voltage (operating)
Anode current (peak)
Duty cycle
(note 2)
Pulse duration
V.S.W.R.
at the output coupler
Rate of rise of voltage pulse
(note 6)
Limits
Anode voltage (peak)
Output power
Frequency
Lower end of tuning range
Upper end of tuning range
R.F. bandwidth at 1/4 power
Stability (note 8)
Heater current (note 9)
Test Conditions 1
Test Conditions 2
Test Conditions 3
155.0 ± 2.5
1550 ±25
0
110
0.001
4.5
(note 12)
145.0 ± 2.5
1450 ±25
0
109
0.001
4.5
(note 12)
145.0 ± 2.5
1450 ±25
3.5
56
0.001
4.5
mT
gauss
V
A
－
μs
1.05
1.05
1.05
－
120
105
85
kV/μs
Test Conditions 1
Test Conditions 2
Test Conditions 3
(note 12)
Min
Max
37
43
1.6
－
Min
42
2.8
Max
48
－
(note 12)
Min
Max
40
46
2.6
－
－
3002
－
－
8
2993
－
2.5/tp
0.5
10
－
3002
－
－
8
2993
－
2.5/tp
0.5
10
－
3002
－
－
8
2993
－
2.5/tp
0.5
10
All specifications are subject to change without notice.
New Japan Radio Co.,Ltd.
SHEET 2 OF 9
Units
Units
kV
kW
MHz
MHz
MHz
%
A
Ver.8
LIFE TEST
End of Life Performance(under Test Conditions)
The tube is deemed to have reached end of life
following:
Peak anode voltage
Peak output power
R.F. bandwidth at 1/4 power
Frequency
Lower end of tuning range
Upper end of tuning range
Stability (note 8)
when it fails to satisfy the
42 kV min.
2.3 MW min.
3.5/tp MHz max.
2993 MHz max.
3002 MHz min.
1% max.
NOTE:
1. Heater voltage must be reduced within 5 seconds after the application of
high voltage according to the schedule shown on page 5.
The magnetron heater must be protected against arcing by the use of a
minimum capacitance of 4000 pF shunted across the heater directly at the
input terminals; in some cases a capacitance as high as 2 μF may be
necessary depending on the equipment design.
2. The various parameters are related by the following formula:
Pi = ib × epy × Du
where
Pi = mean input power in watts
ib = peak anode current in amperes
epy = peak anode voltage in volts
Du = duty cycle
3. The tuner mechanism is driven by means of three tapped holes in the tuner
knob ( see outline drawing ) via a flexible drive. The torque required is 0.7
kg-cm minimum; the torque applied must not exceed 5.0 kg-cm.
4. The magnetron is designed for use with a separate permanent magnet or
electromagnet. The north seeking pole of the magnet must be adjacent to the
cathode terminal, marked C. The position of the magnet must be adjusted so
that the axis of the field is in line with the axis of the anode and is at right
angles to the H plane of the system wave guide.
5. Using a small Hall effect probe, the magnetic field measured at each pole
face of the magnet must be within the following limits:
(1) At the center of the pole face and 38 mm from the surface, the field must
be 155.0 ± 2.5 mT ( 1550 ± 25 gauss ).
(2) At four or more points equispaced on a circle of 33 mm diameter
concentric with the pole face and 6.35 mm from its surface, including a
point nearest the back limb of the magnet, the field must be as follows. At
all points the field must be between 9.0 and 27 mT ( 90 and 270 gauss )
greater than the field measured at the center of the pole face; the
variation between the point must not exceed 13 mT (130 gauss ).
All specifications are subject to change without notice.
New Japan Radio Co.,Ltd.
SHEET 3 OF 9
Ver.8
6. Defined as steepest tangent to leading edge of voltage pulse above 80%
amplitude. Any capacitance in viewing system must not exceed 6.0pF.
7. At the maximum pressure of 3.1 kg/cm2 gauge the maximum leakage will be
such that with an enclosed volume of 1 liter the pressure will not drop by
more than 70 kPa in 7 days.
8. With the tube operating into a V.S.W.R. of 1.5:1 phased to give maximum
instability. Pulses are defined as missing when the r.f. energy level is less
than 70% of the normal energy level in a 0.5% frequency range. Missing
pulses are expressed as a percentage of the number of input pulses applied
during the period of observation after a period of 10 minutes.
9. Measured with heater voltage of 8.5 V and no anode input power.
10. The maximum variation of mean output power when the magnetron is
rotated through 360°around any axis of the magnetron will not be greater
than 4%.
11. The maximum variation of frequency when the magnetron is rotated through
360°around any axis of the magnetron will not be greater than 0.7 MHz.
12. This magnetron has been improved the stable oscillation at the dual energy
mode system operation.
The dual energy system required the plural output power oscillation without
magnetic field changes. This magnetron acceptable to be additionally
inspected the oscillation stability at the each customer's output power
conditions, after discussed the operating condition with our customers.
Of course, for the single energy mode system, this magnetron also
conventionally stable oscillate each operating condition. And then, inspection
at the dual operation conditions will be omitted.
All specifications are subject to change without notice.
New Japan Radio Co.,Ltd.
SHEET 4 OF 9
Ver.8
HEATER VOLTAGE REDUCTION SCHEDULE
All specifications are subject to change without notice.
New Japan Radio Co.,Ltd.
SHEET 5 OF 9
Ver.8
OUTLINE
All specifications are subject to change without notice.
New Japan Radio Co.,Ltd.
SHEET 6 OF 9
Ver.8
OUTLINE DIMENSIONS ( All dimensions without Limits are nominal. )
Ref
Millimeters
A
B
C
D
362.4 ± 1.35
136.09 ± 0.25
89.05
3.20
E
F
G
H
J
L
M
N
P
104.90
35.00
7.00
19.00 ± 0.20
73.82 ± 0.20
12. 50 ± 0.30
133.50
94.85
91.82
Q
R
31.40
5.55
S
191.85
U
V
X
Y
Z
AA
AB
6.35 ± 0.10
107.00
38.10 ± 0.10
6.40 ± 0.05
6.0 min.
8.00
152.25
AC
17.00
AD
AE
AF
AG
AH
AJ
AL
AM
8.00 ± 0.05
106.00
139.70
6.40
120.65
15.0 min.
55.96±0.16
36.91±0.16
All specifications are subject to change without notice.
New Japan Radio Co.,Ltd.
SHEET 7 OF 9
Ver.8
POLE PIECE
NOTE1: Magnetic field shall be 155.0±2.5 mT at this point.
All specifications are subject to change without notice.
New Japan Radio Co.,Ltd.
SHEET 8 OF 9
Ver.8
TRANSITION SECTION : NJC1301F
Ref
Ａ
Ｂ
Ｃ
Ｄ
Ｅ
Ｆ
Ｇ
Ｈ
Ｊ
Ｋ
Ｌ
Ｍ
Ｎ
Ｐ
Ｑ
Ｒ
Ｓ
Ｔ
Ｕ
Ｖ
Ｗ
Ｘ
Ｙ
Millimetres
85.8
92.1+0.12
+0.02
110.9±0.1
133.4
7.7±0.1
3.9±0.05
0
3.05-0.07
6.73±0.13
12.7
34±0.13
72.1±0.13
120.7±0.1
81
38.1±0.05
38±0.1
108±0.05
120
7.95+0.05
0
6.5
6.35±0.13
45°
67.13±0.13
69±0.1
All specifications are subject to change without notice.
New Japan Radio Co.,Ltd.
SHEET 9 OF 9