Isoprime 100 - Coarse Ion Source Tuning Guide for Various Gases

IsoPrime User’s Guide
Version 1.01 IsoPrime100 User’s Guide Page 79 of 219
In this section, it is assumed throughout that the magnet position has been previously optimised
for best peak shape and beam coincidence.
COARSE TUNING THE ION SOURCE
Default source tunings similar to as shown below can be found in all instrument template
projects.
If for any reason a required tuning file for a specific gas is not available, the table below gives
recommended source tuning parameters for the various gas species:
Source
Parameter
CO
2
N
2
CO
SO
2
N
2
O
H
2
Accelerating
Voltage (V)
 3500
 3700
 3700
 2800
 3500
 4800
Extraction
Voltage
 75 %
 75 %
 75 %
 75 %
 75 %
 75 %
Half Plate
Differential (V)
Tuned for maximum sensitivity
Z Plate Voltage
(V)
Tuned for maximum sensitivity
Electron Volts
(eV)
70 to 100
95 to
100
95 to 100
95 to 100
95 to 100
95 to 100
Ion repeller
Voltage (V)
-2 to -10
-2 to -10
-2 to -10
-2 to -10
-2 to -10
 +45
Trap Current*
(μA)
200-800
200-400
200-600
400-600
 400
400-800