HOME SBOX THOMX MINICAV Utilities
THOMX orders THOMX installation THOMX commissioning THOMX control command
  Status of commissioning, report also here plots are reports.  Not logged in ELOG logo
 List  |  Find  |  Login  |  Help 
Entry   Finding correct motors position and parameters to keep the lock during a move, posted by Ronic Chiche at ThomX igloo about mechanics 
    Reply   Finding correct motors position and parameters to keep the lock during a move, posted by Ronic Chiche at ThomX igloo about mechanics 
Message ID: 364     Entry time: Tue Sep 17 12:48:13 2024     In reply to: 363
 Author: Ronic Chiche 
 Status: Fixed 
 Type: info 
 Category: mechanics 
 Location: ThomX igloo 
 Title: Finding correct motors position and parameters to keep the lock during a move 

this morning with Daniele, we did a quite long run with this motor position and it seems we don't lose the lock too much.

the motor positions are:

MOT.03 (M4): -186 500 steps

MOT.06 (M1): -797 500 steps

we got 85kW after CEP optimization and rough alignment optimization.

Ronic Chiche wrote:

this morning, I try to find a new region for MOT.03 and MOT.06 where we can move them without unlocking the cavity.

I started from the position:
MOT06 : ~ -785 000
MOT03 : ~ -200 000

and I do -10 000 steps (dz = 10k x 6nm = 60µm) at a time on both motors.
previously a good region for MOT.06 was -900 000 !

I moved also the laser cavity by 40µm to cancel the beating with the RF frequency.

MOT06 : ~ -795 000
MOT03 : ~ -191 000

Max power after optimazing the CEP ~ 65kW => I need to realign => 78kW
I need to increase the D parameter on the PID to compensate the (85kW / 78kW ratio).

I changed the MOT.03 and MOT.06 speed to 30steps/s => it seems a bit better.
but I still see some lock losses during a move.

.... to be continued...

 

ELOG V3.1.4-395e101