Datasheet

ELECTRON MULTIPLIER
R6985-80
With Conversion Dynode, Off-axis Structure
for Gas / liquid QMS (Quadruple Mass Spectrometry)
SPECIFICATIONS
GENERAL
Parameter
Input Aperture Diameter
Dynode Structure
Number of Dynode Stages
First Dynode Material
Total Built-in Resistance
Operating Ambient Temperature
Storage Temperature
Polarity of Detected Ions
Description / Value
Unit
11
mm
Conversion + box and linear focused —
19
—
—
Al2O3
17.15
MΩ
-30 to +50
°C
-80 to +50
°C
Positive / Negative
—
MAXIMUM RATINGS
Parameter
Anode to First Dynode Voltage
Anode to Last Dynode Voltage
Conversion Supply Voltage
Operating Vacuum Level
Bake-Out Temperature (at 5 × 10-3 Pa)
Average Anode Current A
Operating Gain
Value
-3000
350
±10
1 × 10-2
No baking
10
1 × 108
Unit
V
V
kV
Pa
—
µA
—
Figure 1: Typical Gain
109
TPMHB0876EA
108
107
CHARACTERISTICS
Unit
V
—
µA
pA
ns
pF
Value
-1900
1 × 106
5
1
4.5
1.8
106
GAIN
Parameter
Recommened Supply Voltage
Gain (Typ.)
DC Linearity (Typ.)
Dark Current (Max.)
Rise Time (Typ.)
Anode to All Other Electrode Capacitance
105
104
NOTE: A Averaged over any interval of 30 seconds maximum.
Figure 2: Dimensional Outline (Unit: mm)
CONVERSION DYNODE PIN
103
102
-1000
93 ± 1
INPUT APERTURE 11.0 ± 0.2
ELECTRON MULTIPLIER
-2500
50.0 ± 0.5
30.0 ± 0.5
2- 3.1
MOUNTING
HOLES
22.0 ± 0.5 20.0 ± 0.5
CONVERSION DYNODE
-2000
SUPPLY VOLTAGE (V)
12 ± 1
20.0 ± 0.5
58 ± 1
-1500
HIGH VOLTAGE PIN
30.0 ± 0.5
OUTPUT PIN
TPMHA0587EA
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Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications are
subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2014 Hamamatsu Photonics K.K.
-3000
ELECTRON MULTIPLIER R6985-80
POSITIVE ION / NEGATIVE ION DETECTION MECHANISM
CONVERSION DYNODE
When positive ions strike the conversion dynode, electrons are
emitted from the conversion dynode according to the quantity of
input ions. These emitted electrons are then guided into the
electron multiplier for secondary multiplication.
-10 kV
Q-POLE
ELECTRONS
POSITIVE IONS
Q-POLE
When negative ions strike the conversion dynode, positive ions are
emitted from the conversion dynode according to the quantity of
input ions. These emitted positive ions then enter the electron
multiplier while receiving energy from the difference in potential
between the conversion dynode and electron multiplier, and strike
the first dynode of the electron multiplier where electrons are
released according to the quantity of input positive ions. These
electrons are then guided to the second and subsequent dynodes
for secondary multiplication.
ELECTRONS
-1 kV
GND
CONVERSION DYNODE
+10 kV
Q-POLE
POSITIVE IONS
NEGATIVE IONS
Q-POLE
ELECTRONS
-1 kV
GND
TPMHC0248EA
HAMAMATSU PHOTONICS K.K.
www.hamamatsu.com
HAMAMATSU PHOTONICS K.K., Electron Tube Division
314-5, Shimokanzo, Iwata City, Shizuoka Pref., 438-0193, Japan, Telephone: (81)539/62-5248, Fax: (81)539/62-2205
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TPMH1339E02
Italy: Hamamatsu Photonics Italia S.r.l.: Strada della Moia, 1 int. 6, 20020 Arese (Milano), Italy, Telephone: (39)02-93581733, Fax: (39)02-93581741 E-mail: [email protected]
China: Hamamatsu Photonics (China) Co., Ltd.: B1201 Jiaming Center, No.27 Dongsanhuan Beilu, Chaoyang District, Beijing 100020, China, Telephone: (86)10-6586-6006, Fax: (86)10-6586-2866 E-mail: [email protected]
AUG. 2014 IP
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