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Entry   Recipies for different FPC power, posted by Ronic Chiche at ThomX igloo about lasers and optics 
    Reply   Recipies for different FPC power, posted by Ronic Chiche at ThomX igloo about lasers and optics 
       Reply   Recipies for different FPC power, posted by Ronic Chiche at ThomX igloo about lasers and optics 
Message ID: 436     Entry time: Wed Jul 9 14:12:54 2025     In reply to: 432
 Author: Ronic Chiche 
 Status: Fixed 
 Type: info 
 Category: lasers and optics 
 Location: ThomX igloo 
 Title: Recipies for different FPC power 

For ~ 66kW power in the FP-cavity:

  • Alplhanov amplifier ratio : 25%
     
  • Axis 18 position : +0018369 steps
     
  • PID A (for laser/FPC lock) :

input : input a
P = 0.1
I = 0.0016
D = 1.4
Sign : positive
Sampling : fast
filter : off

  • Search A :

criterion : input d
upper th. : 10V
lower th. : 0.03V
speed : 100V/s
relock mode : none
off mode : hold

  • Output A :

range : 50%
offset : 5V

  • PID B (for RF/FPC lock) :

input : input b
P = 5
I = 0.0001
D = 1
Sign : negative
Sampling : mid
filter : off

  • Search B :

criterion : input c
upper th. : 0.45V
lower th. : -0.45V
speed : 1V/s
relock mode : none
off mode : hold

  • Output B :

range : 20%
offset : 5V

Ronic Chiche wrote:

For ~ 23kW power in the FP-cavity:

  • Alplhanov amplifier ratio : 15%
     
  • Axis 18 position : -0016014 steps
     
  • PID A (for laser/FPC lock) :

input : input a
P = 0.09
I = 0.0016
D = 1.35
Sign : positive
Sampling : fast
filter : off

  • Search A :

criterion : input d
upper th. : 10V
lower th. : 0.03V
speed : 100V/s
relock mode : none
off mode : hold

  • Output A :

range : 50%
offset : 5V

  • PID B (for RF/FPC lock) :

input : input b
P = 5
I = 0.0001
D = 1
Sign : negative
Sampling : mid
filter : off

  • Search B :

criterion : input c
upper th. : 0.45V
lower th. : -0.45V
speed : 1V/s
relock mode : none
off mode : hold

  • Output B :

range : 20%
offset : 5V

Ronic Chiche wrote:

For ~ 46kW power in the FP-cavity:

  • Alplhanov amplifier ratio : 20%
     
  • Axis 18 position : -0004710 steps
     
  • PID A (for laser/FPC lock) :

input : input a
P = 0.06
I = 0.0007
D = 0.85
Sign : positive
Sampling : fast
filter : off

  • Search A :

criterion : input d
upper th. : 10V
lower th. : 0.04V
speed : 100V/s
relock mode : none
off mode : hold

  • Output A :

range : 50%
offset : 5V

  • PID B (for RF/FPC lock) :

input : input b
P = 3
I = 0.00002
D = 2
Sign : negative
Sampling : mid
filter : off

  • Search B :

criterion : input c
upper th. : 0.45V
lower th. : -0.45V
speed : 1V/s
relock mode : none
off mode : hold

  • Output B :

range : 20%
offset : 5V

 

 

 

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