
F.CONTROL SEQUENCES IN LASER OSCILLATOR APPENDIX B-70265EN/02
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[SQ20] READY OF DISCHARGING state
When oscillator start switch is turned on, evacuation is carried on and
then gas pressure control begins. When the gas pressure reaches the
set pressure, the discharge preparation completion state (LRDY) is set
to enable the discharge start switch (HVON) to be turned on.
[SQ30] READY OF BEAM-ON OPERATION state
When HVON is turned on, a high voltage is applied to the discharge
tube to start discharge. Next, the intra-tube gas pressure is controlled
at the pressure at oscillation time, and a compensation coefficient is
found. Then, the base discharge state is set, and the oscillation
preparation completion state is set.
The sequences for starting the oscillator are as follows:
Sequence
number
Meaning
10 Initial state (purge completed state)
16 Exhaust pump being started
17
State waiting for a negative pressure to be reached upon
completion of exhaust operation (leakage check)
18
State waiting for the turbo blower frequency arrival signal
(AR) to be turned on
20
Discharge preparation completion state (LRDY) (waiting for
discharge to be started)
26 Discharge being started
27
State waiting for the base discharge state to be set after the
start of discharge
28 Power compensation being performed
30 Oscillation preparation completion state (LSTR)
The sequences for stopping the oscillator are as follows:
Sequence
number
Meaning
30 Oscillation preparation completion state (LSTR)
23
State waiting for setting from gas pressure during laser
oscillation to discharge start time gas pressure
20 Discharge preparation completion state (LRDY)
14 State waiting 75 seconds
49 Vacuum being drawn with RUN turned off
12 Purge operation being performed
10 Initial state (purge completed state)
In addition, the following sequences are used:
Sequence
number
Meaning
50 State waiting 75 seconds with RUN turned on again
51 Automatic leakage check being made