XP2262
photomultiplier tubes
product specification
A standard fast, 12-stage, 51mm (2") tube
Applications :
High and medium energy physics.
Description :
Window :
Material :
Photocathode :
Refr. index at 420 nm :
lime glass
bi-alkali
1.54
Multiplier :
Structure :
Nb of stages :
linear focused
12
Mass :
130 g
Photocathode characteristics
Spectral range :
Maximum sensitivity at :
290-650
420
nm
nm
70
11.2
90
µA/lm
µA/lmF
mA/W
Sensitivity • :
Luminous :
Blue :
Radiant, at 400 nm :
þ
min.:
9
typ.:
typ.:
typ.:
Characteristics with voltage divider A
Gain slope (vs supp. volt., log/log) :
9
3x107
For a gain of :
þ Supply voltage :
max.: 2400
min.: 1500
þ Anode dark current ‚ :
þ Background noise ƒ :
max.: 6000
Single electron spectrum „ resolution :
peak to valley ratio :
Mean anode sensitivity deviation :
long term (16 h) :
after change of count rate :
vs temperature between 0 and +40°C at 400 nm :
Gain halved for a magnetic field of :
perpendicular to axis "n" :
parallel to axis "n" :
Characteristics with voltage divider … :
typ.:
1800
V
typ.:
typ.:
typ.:
typ.:
10
1000
70
3
nA
cps
%
typ.:
typ.:
typ.:
1
1
- 0.2
%
%
%/K
0.2
0.1
mT
mT
B
A
For a supply voltage of :
2300
Gain :
6x107
Linearity (2%) of anode current up to :
250
Anode pulse † :
Rise time :
2
Duration at half height :
3
Transit Time :
30
Transit Time Difference between centre of PK
and 18mm from it :
Capacitance
anode to all dynodes :
1900
5x10 7
100
mA
2.3
3.7
31
ns
ns
ns
0.7
5
ns
pF
PAGE 1/3
V
18/09/98
ABCDE
XP2262
photomultiplier tubes
product specification
Recommended voltage divider
Type A for maximum gain
K
D1
D2
D3
D4 D5
D6
D7
D8
D9
D10 D11 D12 A
4
1.1
0.9
1
1
1
1
1
1
1
1
1
1
Type B for best timing / linearity compromise
K
D1
D2
D3
D4 D5
D6
D7
D8
D9
D10 D11 D12 A
4
1.1
0.9
1
1
1
1.25 1.25 1.5 2.25 1.75 2.75 2.5
K: photocathode
Dn: dynode
A: anode
(total : 16)
(total : 22.25)
Limiting values
max.: 2x108
max.: 2500
max.:
0.2
Anode luminous sensitivity :
Supply voltage :
Continuous anode current :
V
mA
Voltage between :
D1 and photocathode :
consecutive dynodes :
anode and D12 :
min.:
300
80
max.:
max.:
max.:
800
400
600
V
V
V
min.:
short operation (< 30 mn) :
continuous operation & storage :
min.:
min.:
-30
-30
max.:
max.:
+80
+50
°C
°C
Ambient temperature :
Notes
þ Characteristic measured and mentioned on the test ticket of each tube.
• Luminous sensitivity is measured with a tungsten filament lamp with a colour temperature of 2856 ± 5 K. The blue
radiant blue sensitivity expressed in A/lmF ("F" as filtered) is measured with a tungsten filament lamp with a colour
of 2856 ± 5 K transmitted through a blue filter Corning Cs N°5-58, polished to half stock thickness.
‚ Dark current is measured at ambient temperature, after the tube has been in darkness for approximately 1 min. A
lower value can be obtained after a longer stabilisation period in darkness (approx. 30 min.).
ƒ Noise is measured at ambient temperature. After having been stored with its protection hood, the tube is placed in
darkness with Vd set at a value to give a gain of 3 107. After a 30mn stabilisation period, noise pulses above a
threshold of 1 pC (corresponding to 0.2 photoelectron) are recorded.
„ The peak to valley ratio is defined as the single electron peak value divided by the minimum value to the left of the
peak.
… To obtain a peak pulse current greater than that obtainable with divider A, it is necessary to increase the
inter-dynode voltage progressively. Divider circuit B is an example of a progressive divider, giving an optimisation
of speed and linearity. other dividers can be conceived to achieve other compromises. It is generally recommended
that the voltage ratio between two successive stages is less than 2.
† Measured with a pulse light source, with a pulse duration (FWHM) of approximately 1ns., the cathode being
completely illuminated. The rise time is determined between 10 % and 90 % of the anode pulse amplitude. The
signal transit time is measured between the instant at which the illuminating pulse of the cathode becomes
maximum, and the instant at which the anode pulse reaches its maximum. Rise time, pulse duration and transit
time vary with respect to high tension supply voltage Vht as (Vht)-½. Transit Time Difference between centre and
edge (18mm from PK centre) is 0.25 ns at 2500 V with C divider.
Note : The envelope of the tube is covered with a conductive coating connected to the photocathode on top
of which a black paint is applied. This paint is neither guaranteed to be light-tight nor electrically
insulating. Care should be taken to avoid electrical shock.
PAGE 2/3
18/09/98
ABCDE
XP2262
photomultiplier tubes
product specification
Typical gain curve
Gain
1E+9
1E+8
B
1E+7
A
1E+6
1E+5
1000
1500
Vht(V)
2000
2500
XP2262
Typical spectral characteristics
Sk (mA/W)
100
10
1
200
ref.
90500012
sp:
ic:
n:
short pin
internal connection
plane of symmetry of the multiplier
K:
A:
cathode
anode
300
400
500
600
Wavelength (nm)
700
800
XP2262
PAGE 3/3
Dn:
dynode
Accessories
Socket :
Mu-metal shield :
FE2019
MS172
18/09/98
ABCDE