HAMAMATSU R7639 Datasheet
PHOTOMULTIPLIER TUBE
PRELIMINARY DATA
R7639
JUN. 2000
Quantum Efficiency: 40 % at 155 nm
High Sensitivity Solar Blind Photocathode (115 nm to 230 nm)
28 mm (1-1/8 Inch) Diameter, 9-Stage, Side-On Type
FEATURES
Spectral Response .....................115 nm to 230 nm
Cathode Sensitivity
Radiant at 155 nm ......................... 50 mA/W Typ.
Quantum Efficiency at 155 nm.....................40 %
Anode Sensitivity (at 1000 V)
Radiant at 155 nm ...................1.5 × 105 A/W Typ.
APPLICATIONS
Emission Spectroscopy
VUV Spectrophotometer
TPMSF0083
GENERAL
Parameter
Spectral Response 115 to 230 nm
Wavelength of Maximum Response 155 nm
Photocathode
Material Diamond —
Minimum Effective Area 3 × 12 mm
Window Material MgF2 —
Dynode
Secondary Emitting Surface Sb-Cs —
Structure Circular-cage —
Number of Stages 9 —
Direct Interelectrode Capacitances
Anode to Last Dynode 4 pF
Anode to All Other Electrodes 6 pF
Base 11-pin base
Weight 45 g
Suitable Socket E678-11A(option) —
Description/Value
JEDEC No.B11-88
Unit
Figure 1: Typical Spectral Response
TPMSB0172EB
100
CATHODE RADIANT
SENSITIVITY
10
QUANTUM
EFFICIENCY
1
QUANTUM EFFICIENCY (%)
CATHODE RADIANT SENSITIVITY (mA/W)
0.1
100 200 220 240120 140 160 180 260 280 300
WAVELENGTH (nm)
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PHOTOMULTIPLIER TUBE R7639
MAXIMUM RATINGS (Absolute Maximum Values)
Parameter
Supply Voltage
Between Anode and Cathode V dc
Between Anode and Last Dynode
Between Successive Dynodes V dc
Between First Dynode and Cathode
Average Anode Current mA
Ambient Temperature °C
CHARACTERISTICS (at 25°C)
Parameter
Cathode sensitivity
Quantum Efficiency at 121.6 nm
at 155 nm
Radiant at 121.6 nm
at 155 nm
Anode Sensitivity
Radiant at 155 nm
Gain
Anode Dark Current
ENI (Equivalent Noise Input)
Time Response
Anode Pulse Rise Time
Electron Transit Time
Transit Time Spread (TTS)
(After 30 minutes storage in the darkness)
Rating
1250
250
250
250
0.1
-30 to +50
Unit
V dc
V dc
Min. Unit
10
—
10
—
Typ.
26
40
26
50
1.0 × 1041.5 × 10
—
3.0 × 10
—
—
—
—
—
0.5 5
1.46 × 10
2.2
22
1.2
Max.
—
—
—
—
5
—
6
—
—
-16
—
—
—
%
%
mA/W
mA/W
A/W
—
nA
W
ns
ns
ns
Anode Current Stability
Light Hysteresis
Voltage Hysteresis
NOTES
: Averaged over any interval of 30 seconds maximum.
: Measured with the same light source as Note B and with the voltage
distribution ratio shown in Table 1 below.
Table 1: Voltage Distribution Ratio
Electrode
Distribution
Ratio
Supply Voltage=1000 V dc
K: Cathode Dy: Dynode P: Anode
: Measured with the same supply voltage and voltage distribution ratio
as Note E after removal of light.
: ENI is an indication of the photon-limited signal-to-noise ratio. It re-
fers to the amount of light in watts to produce a signal-to-noise ratio
of unity in the output of a photomultiplier tube.
ENI =
where q = Electronic charge (1.60 × 10
: The rise time is the time for the output pulse to rise from 10 % to 90 %
of the peak amplitude when the entire photocathode is illuminated by
a delta function light pulse.
K Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 Dy9 P
1111111111
2q·ldb·G·∆f
S
ldb = Anode dark current(after 30 minutes storage) in am-
peres.
G = Gain.
∆f = Bandwidth of the system in hertz. 1 hertz is used.
S = Anode radiant sensitivity in amperes per watt at the
wavelength of peak response.
-19
coulomb).
—
—
0.1
1.0
—
—
%
%
: The electron transit time is the interval between the arrival of delta
function light pulse at the entrance window of the tube and the time
when the anode output reaches the peak amplitude. In measurement, the whole photocathode is illuminated.
: Also called transit time jitter. This is the fluctuation in electron transit
time between individual pulses in the signal photoelectron mode, and
may be defined as the FWHM of the frequency distribution of electron transit times.
: Hysteresis is temporary instability in anode current after light and
voltage are applied.
l
max.
l
min.
TIME
TPMSB0002EA
ANODE
CURRENT
Hysteresis =
0
l
max — lmin.
l
i
5 6 7 (minutes)
l
i
× 100 (%)
(1) Light Hysteresis
The tube is operated at 750 volts with an anode current of 1 micro-ampere for 5 minutes. The light is then removed from the tube for a minute.
The tube is then re-illuminated by the previous light level for a minute to
measure the variation.
(2) Voltage Hysteresis
The tube is operated at 300 volts with an anode current of 0.1 microampere for 5 minutes. The light is then removed from the tube and the
supply voltage is quickly increased to 800 volts. After a minute, the supply voltage is then reduced to the previous value and the tube is reilluminated for a minute to measure the variation.
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