4-6 INITIAL OPERATION
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Tel: 970-495-0187, Fax: 970-484-9350, Internet: www.ionsources.com
4.3.2 Gas Only Mode
When gas only mode is selected, the Auto Controller functions as a gas
controller only. Independent control of the each of the four gas channels
is possible. The description below outlines the use with one gas channel
even though similar operation could be obtained using all the gas
channels. Use the Operating Mode Select button to select the gas only
mode. Selecting the Gas Only mode releases control of the Filament and
Discharge Power supplies so that they can be operated independently.
There is no feedback to maintain the discharge parameters. However,
at any time during the operation in gas only mode, the setpoints can be
acquired for operation later using the Auto Gas mode or the Manual Gas
mode.
Note that if there is no communication link to either the Filament Power
Supply or the Discharge Power Supply, the Auto Controller will only
function in the gas only mode, which must be selected to clear the HLP
7 message from the display. There will be no communication link if the
power is switched off to either of the power supplies or if any RS-485
cable connection on the rear panel is not connected to Auto Controller or
either of the power supplies.
There are two modes of operation for the discharge: Constant Current
Mode or Constant Voltage Mode. The Constant Current Mode allows for
small variations in the discharge voltage while maintaining a constant
current and is recommended when operating at 120 V and below.
The Constant Voltage Mode will allow for small variations in discharge
current and maintains a constant voltage. Constant Voltage Mode is
recommended for operation above 120 V.
4.3.2.1 Constant Current Mode
The operating condition selected for this demonstration is with a 2.5A,
120 V, discharge, which is Constant Current Mode operation. These
conditions are based on a vacuum pump speed of 800 liters per second.
Operating parameters for other pump speeds and gases can be found in
the Ion Source Manual.
Note that the operating range of the ion source may be limited by the
vacuum facility pump speed or other process that take place while the
ion source is running.
• Select Gas 1 using the white Gas Channel Select button on the Auto
