在线英汉翻译
Applications :High and medium energy physics.
Description :Window :Material :lime glass
Photocathode :bi-alkali
Refr. index at 420 nm : 1.54
Multiplier :Structure :linear focud
Nb of stages :12
Mass :130 g
Photocathode characteristics
Spectral range :290-650nm
Maximum nsitivity at :420nm Sensitivity • :
Luminous :typ.:70µA/lm
þBlue :min.:9typ.:11.2µA/lmF
Radiant, at 400 nm :typ.:90mA/W Characteristics with voltage divider A
Gain slope (vs supp. volt., log/log) :9
For a gain of :3x107
þSupply voltage :max.:2400typ.:1800V
min.:1500
þAnode dark current ‚ :typ.:10nA
þBackground noi ƒ :max.:6000typ.:1000cps Single electron spectrum „ resolution :typ.:70%
peak to valley ratio :typ.:3 Mean anode nsitivity deviation :
long term (16 h) :typ.:1%
after change of count rate :typ.:1%
vs temperature between 0 and +40°C at 400 nm :typ.:- 0.2 %/K Gain halved for a magnetic field of :
or
perpendicular to axis "n" :0.2mT
火车男parallel to axis "n" :0.1mT Characteristics with voltage divider … :B A
For a supply voltage of :23001900V Gain :6x1075x107
Linearity (2%) of anode current up to :250100mA Anode pul †:
Ri time :2 2.3ns
Duration at half height :3 3.7ns
Transit Time :3031ns
Transit Time Difference between centre of PK
and 18mm from it :0.7ns Capacitance anode to all dynodes :5pF PAGE 1/318/09/98
Recommended voltage divider
Type A for maximum gain
K D1D2D3D4D5D6D7D8D9D10D11D12A
4 1.1 0.9 1 1 1 1 1 1 1 1 1 1 (total : 16)
Type B for best timing / linearity compromi
K D1D2D3D4D5D6D7D8D9D10D11D12A
4 1.1 0.9 1 1 1 1.2
5 1.25 1.5 2.25 1.75 2.75 2.5(total : 22.25)
K: photocathode Dn: dynode A: anode
Limiting values
Anode luminous nsitivity :max.:2x108
Supply voltage :max.:2500V Continuous anode current :max.:0.2mA Voltage between :
D1 and photocathode :min.:300max.:800V
concutive dynodes :max.:400V
anode and D12 :min.:80max.:600V Ambient temperature :
short operation (< 30 mn) :min.:-30max.: +80°C
continuous operation & storage :min.:-30max.: +50°C罗斯福对日宣战演讲
Notes
þ Characteristic measured and mentioned on the test ticket of each tube.
留学中介• Luminous nsitivity is measured with a tungsten filament lamp with a colour temperature of 2856 ± 5 K. The blue radiant blue nsitivity expresd 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.
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‚ 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 Noi is measured at ambient temperature. After having been stored with its protection hood, the tube is placed in darkness with Vd t at a value to give a gain of 3 107. After a 30mn stabilisation period, noi puls 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 pul current greater than that obtainable with divider A, it is necessary to increa 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 compromis. It is generally recommended that the voltage ratio between two successive stages is less than 2.
† Measured with a pul light source, with a pul duration (FWHM) of approximately 1ns., the cathode being completely illuminated. The ri time is determined between 10 % and 90 % of the an
ode pul amplitude. The signal transit time is measured between the instant at which the illuminating pul of the cathode becomes maximum, and the instant at which the anode pul reaches its maximum. Ri time, pul 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.
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Accessories
appealsSocket :
2016高考英语听力
身份证号查询四级成绩入口FE2019Mu-metal shield :
MS172
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