PHOTOMULTIPLIER TUBE

R2078

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subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2014 Hamamatsu Photonics K.K.

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SPECIFICATIONS

FEATURES

Extremely Improved Solar Blind Photocathode for Aerospace and

General Photometric Applications, 25 mm (1 Inch) Diameter,

Ruggedized Low Profile Tube, Cs-Te Photocathode, 10-Stage, Head-on

GHigh Quantum Efficiency ............................

GRuggedized, Low Profile Structure ............

14 % at 254 nm Typ.

43 mm in bulb length

Parameter

Description / Value

Unit

Spectral Response

Wavelength of Maximum Response

Photocathode

Window Material

Dynode

Base (temporary)

Operating Ambient Temperature

Storage Temperature

Suitable Socket

nm

nm

—

mm

—

—

—

—

—

°C

°C

160 to 320

240

Cs-Te

21

Quartz

Circular cage

10

12-pin base JEDEC No. B12-13

-40 to +80

-40 to +80

E678-12A (supplied)

Material

Minimum Effective Area

Structure

Number of Stages

MAXIMUM RATINGS (Absolute Maximum Values)

Supply Voltage: 1500 V, K: Cathode, Dy: Dynode, P: Anode

CHARACTERISTICS (at 25

°C)

VOLTAGE DISTRIBUTION RATIO AND SUPPLY VOLTAGE

Parameter

Min.

Unit

Parameter

Value

Unit

Supply Voltage

Average Anode Current

2000

300

0.015

V

V

mA

Between Anode and Cathode

Between Anode and Last Dynode

Radiant at 254 nm

Radiant at 365 nm

Radiant at 550 nm

Quantum Efficiency at 254 nm

Radiant at 254 nm

PHD at 1

Cathode Sensitivity

Anode Sensitivity

Gain

Anode Dark Current (after 30 min storage in darkness)

Dark Counts

NOTE: AThe discrimination level is set at one forth the average electron pulse height to measure the background.

BPlateau voltage (V0) at the test up in HPK.

CThe rise time is the time of the output pulse to rise from 10 % to 90 % of peak amplitude when the entire photocathode is illuminated by a

delta function light pulse.

Electrodes

Ratio

K

Dy1

2

Dy2

1

Dy3

1

Dy4

1

Dy5

1

Dy6

1

Dy7

1

Dy8

1

Dy9

11

1

Dy10

P

20

—

—

9.8

2.0

1.0

—

—

—

—

29

3.4

3.8

14.2

1.5

5.0

15

10

20

1.5

mA/W

mA/W

mA/W

%

A/W

—

pA

ns

—

1.2

—

—

—

—

100

20

—

—

Typ.

Max.

GENERAL