HAMAMATSU PHOTONICS K.K., Electron Tube Center
314-5, Shimokanzo, Toyooka-village, Iwata-gun, Shizuoka-ken, 438-0193, Japan, Telephone: (81)539/62-5248, Fax: (81)539/62-2205
U.S.A.: Hamamatsu Corporation: 360 Foothill Road, P. O. Box 6910, Bridgewater. N.J. 08807-0910, U.S.A., Telephone: (1)908-231-0960, Fax: (1)908-231-1218 E-mail: usa@hamamatsu.com
Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49)8152-375-0, Fax: (49)8152-2658 E-mail: info@hamamatsu.de
France: Hamamatsu Photonics France S.A.R.L.: 8, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: (33)1 69 53 71 00, Fax: (33)1 69 53 71 10 E-mail: infos@hamamatsu.fr
United Kingdom: Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road Welwyn Garden City Hertfordshire AL7 1BW, United Kingdom, Telephone: 44-(0)1707-294888, Fax: 44(0)1707-325777 E-mail: info@hamamatsu.co.uk
North Europe: Hamamatsu Photonics Norden AB: Smidesv gen 12, SE-171-41 SOLNA, Sweden, Telephone: (46)8-509-031-00, Fax: (46)8-509-031-01 E-mail: info@hamamatsu.se
Italy: Hamamatsu Photonics Italia: S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: (39)02-935 81 733, Fax: (39)02-935 81 741 E-mail: info@hamamatsu.it
HOMEPAGE URL http://www.hamamatsu.com
Specifications
Dimensional Outline
(Unit: mm)
R8811
TEM A0021EA
HAMAMATSU
HIGH VOLTAGE LEAD
FARADAY CUP LEAD
ANODE LEAD
20
20
19.5
EFFECTIVE
AREA 3 Dia.
R8810
TEM A0022EA
HIGH VOLTAGE
LEAD
FARADAY CUP LEAD
ANODE LEAD
HAMAMATSU
15
15
14
EFFECTIVE
AREA 3 Dia.
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.
'
2001 Hamamatsu Photonics K.K.
Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office.
Parameter
R8810
R8811
Gain (Typ.)
Dark Current (Typ.)
Operating Pressure Level (Max.)
Bake-Out Temperature (at 10
-4
Pa, Max.)
Supply Voltage (Max.)
Operating Gain (Max.)
Faraday Cup Voltage (Max.)
Effective Area
Number of Dynode Stages
Total Built-in Resistor Value
Polarity of Detected Ions
Recommended Supply Voltage
Recommended Faraday Cup Voltage
Recommended Input Ion Energy
* When operating at pressure of 1 Pa, use caution to prevent discharge in particular at the junction point between the ion detector and feedthough.
Also be sure to maintain a safe distance between the ion detector and the metal parts around it.
1 x 10
5
(at -1500 V)
3 x 10
-14
A (at -1500 V)
1 x 10
-2
Pa
-2000 V
5 x 10
6
200 V
13 stages
13 M
-1500 V
2 x 10
3
(at -1000 V)
3 x 10
-14
A (at -1000 V)
1 Pa *
-1500 V
5 x 10
5
100 V
9 stages
9 M
-1000 V
350
C
3 mm Dia.
Positive
0 V
10 eV
TEM 1011E02
NOV. 2001 IP
Ion Detectors
PRELIMINARY
TEM B0036EA
Right : R8810
Left : R8811
-1000 V
ELECTRON
FARADAY-CUP
GND
Q-POLE
POSITIVE ION
Q-POLE
TEM C0025EA
TEM B0059EA
TEM B0060EA
100
10
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
1000
SUPPLY VOLTAGE (V)
10000
GAIN
R8811
R8810
TEM B0061EA
-3000
-2500
-1500
-1000
-500
0
0.001
0.01
0.1
1
ACCUMULATED OUTPUT CHARGE (C)
SUPPLY VOLTAGE (V)
10
100
1000
-2000
R8811
0
10
0
10
20
30
40
50
60
70
80
90
100
20
30
INPUT ION ENERGY (eV)
40
50
60
DETECTION EFFICIENCY (%)
R8811
10
-9
10
-11
10
-12
10
-13
10
-14
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
TIME (Min.)
OUTPUT CURRENT (A)
10
-10
R8810
R8811
Quadrupole mass spectrometers used for residual gas
analyzers have been downsized to solve problems of
high-pressure operation and limited installation space. A
trend of the downsizing would be an ever-greater degree
in the future. However, it cannot be achieved just by re-
ducing the ion source and Quadrupole electrode sizes.
Small ion detector is also required essentially. To meet
the requirement, Hamamatsu has developed compact
ion detectors. These unique ion detectors break the per-
formance barriers on conventional electron multipliers
and will prove the ideal result for your needs.
Despite the compact size, the electron multiplier electrodes have a large secondary emissive
surface, delivering a long service life equal to that of conventional electron multipliers.
A drop in gain after exposure to air is also minimized because the secondary electron emissive
surface is resistant to carbon absorption, which is a cause of gain decrease. It ensures reliable
operation over extended periods of time.
Especially, R8810 has an extra advantage of being able to operate under high pressures.
Ions emitted from Quadrupole are multiplied while being deflected and focused by the electron
lens created by the combination of the Faraday cup, the ion deflection electrodes and the elec-
tron multiplier electrodes. The layout of the Faraday cup, the ion deflection electrodes and the
electron multiplier electrodes are designed by special 3D simulation of ion and electron trajec-
tories. This layout allows detecting the input ions with high efficiency.
Life Characteristics
These compact ion detectors have an off-axis structure and a Faraday cup needed for ion de-
tection in Quadrupole mass spectrometers which are capable of making precise measure-
ments over a wide dynamic range with a high S/N. The structure also incorporates a voltage
divider, which is essential for discrete type electron multipliers. By simply wiring the high volt-
age, the signal and the Faraday cup, reliable operation can be achieved without adding any
other parts.
Structure
The electron lens created by the Faraday cup, the ion deflection electrodes and the electron
multiplier electrodes maintains high detection efficiency even when input ion energy increases.
Detection Efficiency vs. Input Ion Energy
Electron trajectories inside the ion detectors are optimized by special 3D simulation technique
to provide good linearity for the gain performance as a function of supply voltage.
Gain Characteristics
The electrode layout and structure are carefully designed to minimize ion feedback and dis-
charge, allowing operation at a stable base line even under high pressure.
Noise Characteristics
Compact Ion Detectors
Compact Ion Detectors
PDF 
ZIP