GENERAL

Parameter

Description

Unit

MAXIMUM RATINGS (Absolute Maximum Values)

For High Energy Physics, Fast Time Response, High Pulse Linearity

127 mm (5 Inch) Diameter, Bialkali Photocathode, 14-Stage, Head-on Type

CHARACTERISTICS (at 25

°C)

Parameter

Min.

Unit

Parameter

Value

Unit

Typ.

Max.

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subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2010 Hamamatsu Photonics K.K.

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PHOTOMULTIPLIER TUBE

R1250

Supply Voltage

Average Anode Current

3000

500

0.2

Between Anode and Cathode

Between Anode and Last Dynode

V

V

mA

55

7.0

—

300

—

—

—

—

—

—

—

—

—

—

—

70

9.0

22

1000

130

1.4

50

2.5

54

1.2

8.3

1.0

1.0

160

250

µA/lm

—

%

A/lm

—

—

nA

ns

ns

ns

%

%

%

mA

mA

—

—

—

—

—

—

300

—

—

—

—

—

—

—

—

Cathode Sensitivity

Anode Sensitivity

Gain

Anode Dark Current (after 30 min storage in darkness)

Time Response

Gain Deviation

Pulse Linearity *

Luminous (2856 K)

Blue Sensitivity Index (CS 5-58)

Quantum Efficiency at 390 nm

Luminous (2856 K)

Blue Sensitivity Index (CS 5-58)

Anode Pulse Rise Time

Electron Transit Time

Transit Time Spread

Long Term

Short Term

2 % Deviation

5 % Deviation

NOTE: Measured with special voltage distribution ratios shown in the Table 2.

nm

nm

—

mm

—

—

—

°C

°C

—

—

300 to 650

420

Bialkali

120

Borosilicate glass

Linear focused

14

-30 to +50

-30 to +50

20-pin base

E678-20B (supplied)

Material

Minimum Effective Area

Structure

Number of Stages

Spectral Response

Wavelength of Maximum Response

Photocathode

Window Material

Dynode

Operating Ambient Temperature

Storage Temperature

Base

Suitable Socket

Supply Voltage: 2000 Vdc, K: Cathode, Dy: Dynode, P: Anode, G: Grid

Table 1: VOLTAGE DISTRIBUTION RATIO AND SUPPLY VOLTAGE

Electrode

Ratio

K

Dy1

0

Dy2

1.2

G1

2.5

G2

7.5

Dy3

1.8

Dy4

1

Dy5

1

Dy6

1

Dy7

1

Dy8

1

Dy9

11

1

Dy10 Dy11 Dy12

1.5

Dy13

1.5

3

2.5

Dy14

P

Supply Voltage: 2500 Vdc, K: Cathode, Dy: Dynode, P: Anode, G: Grid

Table 2: SPECIAL VOLTAGE DISTRIBUTION RATIO AND SUPPLY VOLTAGE

FOR PULSE LINEARITY MEASUREMENT

Electrode

Ratio

Capacitors in

µF

K

Dy1

0

Dy2

1.2

G1

2.5

G2

7.5

Dy3

1.8

Dy4

1

Dy5

1

Dy6

1

Dy7

1

Dy8

1.2

Dy9

1.5

2

2.8

Dy10 Dy11 Dy12

4

Dy13

5.7

8

5

0.01

0.01

0.02

0.02

0.02

0.04

0.06

Dy14

P