29
Do not select beam current while in Manual mode.
2. Adjust for a minimum accelerator current:
a. Adjust the accelerator voltage to minimize the accelerator current
(refer to Step
13. on page 39
). Typically, the accelerator current
should be no more than 10% of the beam current.
•
Excessive accelerator currents may be an indication of mis-
aligned grids or a system pressure above 4 x 10
-2
Pa (3 x 10
-4
Torr).
•
Refer to the ion source technical manual for grid alignment
procedures.
b. Adjust the operating conditions and/or gas flow rate to bring the A/
B Ratio within the recommended limits.
When the accelerator-current-to-beam-current ratio exceeds the pro-
grammed A/B Ratio value, an audio alarm will sound, if enabled, and an
E25 error message will appear on the Accelerator Current display.
Operating the ion source with high accelerator current may damage the
grids.
3. Adjust the neutralizer filament current until the neutralizer emission cur-
rent is about 110% to125% of the beam current (refer to Step
9. on
page 25
).
•
When the neutralizer current is satisfactory, the MPS-3000 CE
FC power supply should be completely adjusted for Manual
mode operation.
•
The user may continue operating in Manual mode or may
select Local mode (refer to
“Local Operation” on page 42
).
FC Storing Operating Conditions
All adjustable operating conditions are stored automatically in the selected
memory location when the Adjust knob is turned. This is the only method of
storing parameters.
FC Recalling Operating Conditions
Selecting RCL with the MEMORY switch, allows the user to view the operat-
ing conditions stored in the unused memory location. After about four sec-
onds, the original parameters will be displayed.
NOTE
NOTE
CAUTION
Summary of Contents for MPS-3000 CE
Page 1: ...MPS 3000 CE Power Supply Technical Manual 425964...
Page 2: ...MPS 3000 CE Power Supply Technical Manual...
Page 90: ...86 Filament Cathode with Filament Neutralizer or PBN Option...
Page 91: ...87 Hollow Cathode and HCN 7 pin or 2 x 4 pin feedthrough...
Page 92: ...88 Hollow Cathode and Hollow Cathode Neut 6 pin feedthrough...
Page 93: ...89 Filament Cathode with Filament Neutralizer or PBN Option...
Page 94: ...90 3cm Source Filament Cathode and Filament Neutralizer...
Page 95: ...91 3cm Source Hollow Cathode and Hollow Cathode Neutralizer...
