PLS Short Pulse Pump Laser Controls

• PLS Short Pulse Laser Main Control Panel
• PLS Short Pulse Laser Diagnostics Panel
• PLS Short Pulse Internal Trigger Panel

• Related Information
• History Plots HOWTO

PLS Short Pulse Laser Main Control Panel

Diagnostics:

• Counter

 

 
 
 

Indicates if communication between local laser control and EPICS is established.

• Laser Status

 

 
 
 

Indicates the state of the laser:

Shutdown mode
Cold start mode
Standby mode
Warm start mode
Laser running mode
Q - Switch changing mode

In normal operation 'Laser running mode' or 'Standby mode' are the default states.
• Interlock summary

 

 
 
 

Indicates if all the required interlock conditions are met (User, Cover, Diode Temperature, LBO Temperature, Temperature Sensor, Flow, Power supply error, Diode error). The detailed interlock status is displayed in the 'Diagnostics Panel'.

• Key state

 

 
 
 

Indicates if the power supply key is in 'ON' or 'OFF' position.

• Q - Switch state

 

 
 
 

Reads back the Q - Switch state ('Internal', 'External' or 'off').
External is the default mode.

• Power setting (Reading)

 

 
 
 

Reads back the laser power level set by the operator. This is not a true readback of the laser power.

• LBO temperature (Reading)

 

 
 
 

Reads back the LBO temperature. The temperature should agree to the setting (~325.5 degF). A deviation from this temperature results in inefficient wavelength conversion.

• Q - Switch frequency (Reading)

 

 
 
 

Indicates the frequency at which the Q - Switch is operating.

Controls:

• Power setting

 

 
 
 

Sets the laser power level.

• Q - Switch state setting

 

 
 
 

The Q - Switch can be triggered using 'external' or 'internal' mode. The 'external' mode uses a trigger based on SLAC beam codes. This is the default setting. The 'internal' mode or 'OFF' mode should be used only for trouble shooting by experts.

• LBO temperature setting

 

 
 
 

Sets the temperature of the LBO frequency doubler. The temperature should agree with the 'Factory setting'. Changes should be made by experts only.

• ON/OFF switch

ON:      Turns on the pump laser diodes if the laser is in STANDBY mode.
OFF:    Turns off the pump laser diodes if the laser is in LASER RUNNING mode.

If the laser needs to be turned on after a failure (trip off), the 'ON/OFF' switch has to be pushed twice.

• Diagnostics

 

 
 
 

Opens the diagnostics panel with additional information (Pump diode states, interlock details)

• QS - Trigger

 

 
 
 

Opens the internal trigger panel. Only useful if Q - Switch state is set to internal.

PLS Short Pulse Laser Diagnostics Panel

Diagnostics

• Laser Status

 

 
 
 

Indicates the state of the laser:

Shutdown mode
Cold start mode
Standby mode
Warm start mode
Laser running mode
Q - Switch changing mode

In normal operation 'Laser running mode' or 'Standby mode' are the default states.
• Interlock summary

 

 
 
 

Indicates detailed information about interlock conditions:

User,
Cover,
Diode Temperature,
LBO Temperature,
Temperature Sensor,
Flow,
Power supply error,
Diode error.

If all required interlocks are met, the Interlock summary state indicates OK.
• Key state

 

 
 
 

Indicates if the power supply key is in 'ON' or 'OFF' position.

• LBO

LBO temperature (Reading)

Reads back the LBO temperature. The temperature should agree to the setting (~325.5 degF). A deviation from this temperature results in inefficient wavelength conversion.

LBO User setpoint (Reading)

Reads back the temperature set by the user. The temperature should agree with 'LBO setpoint temp - set'.

LBO Factory setpoint (Reading)

Reads back the LBO temperature factory value. Currently no deviation from this value were necessary.

• Q - Switch

Q - Switch state

Reads back the Q - Switch state ('Internal', 'External' or 'Off').External is the default mode.

Q - Switch frequency (Reading)

Indicates the frequency at which the Q - Switch is operating.

• Diode Operation Details

Variable	Description	Unit	Default
DT1 - 4	Temperature of pump diodes	degF	77 - 78
DTSET 1 - 4	Temperature setting of pump diodes	degF	78.00, 78.00, 78.00, 78.00
DI 1 - 4	Current of diode operation	A	18 - 20
DISET 1 - 4	Current setting for diode operation	A	19.20, 18.20, 18.60, 19.00
IMAX 1 - 4	Current maximum for diode operation	A	23.80, 22.60, 23.00, 23.40
ITHR 1 - 4	Current threshold for diode light emission	A	9.00, 8.20, 8.60, 9.00

Controls

• ON/OFF switch

ON:      Turns on the pump laser diodes if the laser is in STANDBY mode.
OFF:    Turns off the pump laser diodes if the laser is in LASER RUNNING mode.

If the laser needs to be turned on after a failure (trip off), the 'ON/OFF' switch has to be pushed twice.

• LBO temperature setting

 

 
 
 

Sets the temperature of the LBO frequency doubler. The temperature should agree with the 'Factory setting'. Changes should be made by experts only.

PLS Short Pulse Internal Trigger Panel

Diagnostics

• Q - Switch

Q - Switch state

Reads back the Q - Switch state ('Internal', 'External' or 'Off').External is the default mode.

Q - Switch frequency (Reading)

Indicates the frequency at which the Q - Switch is operating.

Controls

• Adjustment of internal trigger frequency

Related Information

E158 Laser Controls EPICS links:

• CID Laser PC CA Server
• One line Report of General and LabView PVs
• Database Template
• PEPII Controls

History Plots HOWTO

1. Open Epics Panel (Main or Diagnostics)
2. move mouse cursor over value
3. middle click mouse button, this will display the variable name in 'dmchan'
4. On the SCP go to Index --> SPECAL DISPLY --> Generl HIST Plots --> ENTER FULL NAME and manually type in the variable name (or drag and drop from 'dmchan')
5. ON the SCP Panel (GENERAL PURPOSE HISTORY PLOTTING) select the desired time and select AUTO SCALE PLOT