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| photomultiplier tubes product specification A standard fast, 12-stage, 51mm (2") tube Applications : Description : High and medium energy physics. Window : Material : Photocathode : Refr. index at 420 nm : Structure : Nb of stages : 130 g lime glass bi-alkali 1.54 linear focused 12 XP2262 Multiplier : Mass : Photocathode characteristics Spectral range : Maximum sensitivity at : Sensitivity * : Luminous : Blue : Radiant, at 400 nm : min.: 9 typ.: typ.: typ.: 70 11.2 90 A/lm A/lmF mA/W 290-650 420 nm nm Characteristics with voltage divider A Gain slope (vs supp. volt., log/log) : For a gain of : Supply voltage : max.: 2400 min.: 1500 typ.: typ.: typ.: typ.: typ.: typ.: typ.: typ.: 9 3x107 1800 10 1000 70 3 1 1 - 0.2 0.2 0.1 V nA cps % Anode dark current : Background noise : 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 +40C at 400 nm : Gain halved for a magnetic field of : perpendicular to axis "n" : parallel to axis "n" : % % %/K mT mT Characteristics with voltage divider ... : B A 1900 5x10 7 100 2.3 3.7 31 0.7 5 V mA ns ns ns ns pF 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 : PAGE 1/3 18/09/98 ABCDE 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 XP2262 (total : 16) (total : 22.25) Limiting values Anode luminous sensitivity : Supply voltage : Continuous anode current : Voltage between : D1 and photocathode : consecutive dynodes : anode and D12 : Ambient temperature : short operation (< 30 mn) : continuous operation & storage : min.: min.: -30 -30 max.: max.: +80 +50 C C min.: min.: 300 80 max.: max.: max.: 800 400 600 V V V max.: 2x108 max.: 2500 max.: 0.2 V mA Notes 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 N5-58, 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.). 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)-1/2. 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 photomultiplier tubes product specification Typical gain curve Gain 1E+9 XP2262 1E+8 1E+7 B 1E+6 A 1E+5 1000 XP2262 1500 Vht(V) 2000 2500 Typical spectral characteristics Sk (mA/W) 100 10 1 200 300 400 500 600 Wavelength (nm) 700 800 ref. sp: ic: n: K: A: 90500012 XP2262 short pin internal connection plane of symmetry of the multiplier cathode anode Dn: dynode Accessories Socket : Mu-metal shield : FE2019 MS172 PAGE 3/3 18/09/98 ABCDE |
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