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| ( DataSheet : www..com ) photomultiplier tubes product specification XP3462 Fast, 8-stage, 76 mm (3") round tube Applications : This tube features a good compromise between pulse amplitude resolution and time characteristics for scintillation detection application. Window : Material : Photocathode : Refr. index at 420 nm : Structure : Nb of stages : 200 g lime glass bi-alkali 1.54 linear focused 8 Description : Multiplier : Mass : Photocathode characteristics Spectral range : Maximum sensitivity at : Sensitivity * : Luminous : Blue : Radiant, at 420 nm : min.: 9 typ.: typ.: typ.: 290-650 420 100 12 96 nm nm A/lm A/lmF mA/W Characteristics with voltage divider A Gain slope (vs supp. volt., log/log) : For a gain of : Supply voltage : max.: 1600 min.: 1150 max.: 20 max.: 10000 typ.: typ.: typ.: 5.5 106 1350 2 5000 1 1 -0.2 typ.: typ.: 60 2 0.2 0.1 V nA c/s % % %/K % Anode dark current : Background noise : Mean anode sensitivity deviation : long term (16h) : after change of count rate : vs temperature between 0C and +40C at 400 nm Single electron spectrum : resolution : peak to valley ratio : Gain halved for a magnetic field of : perpendicular to axis "n" : parallel with axis "n" : mT mT Characteristics with voltage divider ... : For a supply voltage of : Gain : Linearity (2%) of anode current up to : Anode pulse : Rise time : Duration at half height : Transit Time : Transit Time Difference centre of PK to 18mm from it : Capacitance anode to all dynodes : B 1600 106 200 3 4 40 0.5 A 1350 106 50 V mA ns ns ns ns pF 0.7 5 PAGE 1/3 19/04/99 ABCDE www..com photomultiplier tubes product specification Recommended voltage divider Type A for maximum gain K G1 G2 D1 D2 D3 D4 D5 D6 D7 D8 A 0.12 0.7 2.3 1.5 1 1 1 1 1 1 1 Type B for best timing / linearity compromise K G1 G2 D1 D2 D3 D4 D5 D6 D7 D8 A 0.12 0.7 2.3 1.5 1.25 1.25 1.5 1.75 2 2.75 2.75 K: photocathode G1, G2: focusing electrodes Dn: dynode XP3462 (total :11.62) (total :17.87) A: anode Limiting values Gain: Supply voltage : Continuous anode current : Voltage between: G1 and photocathode : D1 and photocathode : consecutive dynodes : anode and D8 : Ambient temperature: short operation (< 30 mn) : continuous operation & storage : min.: min.: -30 -30 max.: max.: +80 +50 C C min.: min.: 250 80 max.: max.: max.: max.: 20 700 400 600 V V V V max.: 3x106 max.: 2000 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 sensitivity, expressed in A/lmF ("F" as in Filtered) is measured with a tungsten filament lamp with a colour temperature of 2856 5 K. Light is transmitted through a blue filter Corning CS no.5-58, polished to half stock thickness. The radiant sensitivity is measured with a tungsten filament lamp with a colour temperature of 2856 5K. Light is transmitted through an interference filter. Radiant sensitivity at 420 nm, expressed in mA/W, can be estimated by multiplying the blue sensitivity, expressed in A/lmF, by 7.5 for this type of tube. Dark current is measured at ambient temperature, after the tube has been in darkness for approximately 1 min. Lower value can be obtained after a longer stabilisation period in darkness (approx. 30 min.). Noise is measured at ambient temperature, after the tube has been stored with its protection hood, the tube is placed in darkness with Vd set at a value to give a gain of 3x107. After a 30 mn stabilisation period, noise pulses with a threshold of 1 pC (corresponding to 0.2 PE) are recorded. The peak to valley ratio is defined as the single electron peak value divided by the minimum value at 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 C is an example of a progressive divider, giving a compromise between gain, 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 1 ns., 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. 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 19/04/99 ABCDE photomultiplier tubes product specification Typical gain curve Gain 1E+7 XP3462 1E+6 B A 1E+5 1E+4 800 XP3462 1000 1200 1400 1600 Vht(V) 2000 Typical spectral characteristics Ske (mA/W) 100 10 1 ref.: sp: ic: n: 07200008 short pin internal connection plane of symmetry of the multiplier 200 XP3462 300 400 500 600 Wavelength (nm) 700 800 K: cathode Dn: dynode G1, G2: focusing electrodes A: anode Ct: coating Accessories Socket: FE2019 Mu-metal shield: MS153 PAGE 3/3 19/04/99 ABCDE |
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