| ID |
Date |
Author |
Status |
Type |
Category |
Location |
Title |
Text |
 |
|
440
|
Thu Jul 10 15:44:43 2025 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | long run to test the appearance of high frequency noise | today, long run directly at full power
(33% amplifier ratio) => 98kW in the FPC
at the very begining of the run. |
|
|
441
|
Thu Jul 10 18:02:54 2025 |
Ronic Chiche | Fixed | info | detectors and electronics | ThomX igloo | laser PZT amplifier | this afternoon, I added the Gain = 2.8
amplifier at the output of the Laselock to
drive the laser PZT. |
|
|
442
|
Thu Jul 10 18:33:48 2025 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | New recipies with additionnal attenuation before the diffuser and new x3 amplifier on laser PZT | With optical attenuation + x3 amplifier
on laser PZT channel + feedback tuning
Temporary recipie |
|
|
443
|
Fri Jul 11 16:15:12 2025 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | Tuning of the slow feeback loop analog BW + fast feedback loop gain + PID | Today with Daniele, we tuned the potentiometer
after the Laselock which drives the analog
BW of the PID on the laser PZT, |
|
|
448
|
Thu Aug 7 11:14:47 2025 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | Alignment correction during the summer break | I restarted the FPC system this morning.
after some classic alignement procedure
(some LEFT steps on the cavity injection |
|
|
449
|
Wed Aug 27 12:01:41 2025 |
Ronic Chiche | Fixed | info | detectors and electronics | ThomX igloo | Power shut down on August 29th | This morning, all the equipments have been
switched off due to a power shut down
tomorrow morning. |
|
|
450
|
Thu Aug 28 18:01:46 2025 |
Ronic Chiche | Fixed | info | detectors and electronics | ThomX igloo | Power shut down on August 29th | after alignment, CEP adjustment and optimizing
the PDH phase, I got back ~92kW in the FPC
for 33% amplifier ratio. |
|
|
451
|
Tue Sep 16 12:32:52 2025 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | polarization measurement of the FP cavity beam | today, with Daniele, we did a simple polarization
measurement in transmission of the FP cavity
beam. |
|
|
452
|
Tue Sep 16 17:41:28 2025 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | detectors and electronics | ThomX igloo | Accelerometer measurement | with Daniele, we placed the accelerometer
on top of the fiber amplifier box which is
inside the housing. |
|
|
453
|
Thu Sep 18 18:29:04 2025 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | vacuum | detectors and electronics | cabling | software | utilities | ThomX igloo | Power shut down on September 23th | to anticipate the power shut down on next
tuesday 23/09,
this afternoon, I switched off all |
|
|
454
|
Fri Sep 26 11:08:21 2025 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | vacuum | detectors and electronics | cabling | software | utilities | ThomX igloo | Power shut down on September 23th | this morning, I restarted all the equipments
of the FPC.
everything was fine after being |
|
|
455
|
Fri Sep 26 11:13:35 2025 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | vacuum | detectors and electronics | cabling | software | utilities | ThomX igloo | Power shut down on September 23th | the 33MHz/500MHz RF frequencies from the
Ring seems different from the previous state
(maybe working at an energy of 50MeV instead |
|
|
456
|
Mon Sep 29 10:22:32 2025 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | vacuum | detectors and electronics | cabling | software | utilities | ThomX igloo | Power shut down on September 23th | This morning I did a phase alignment on
the PDH signal generator (Rigol DG4102)
this procedure ensure that both phases |
|
|
457
|
Tue Sep 30 15:17:30 2025 |
Ronic Chiche | Fixed | issue | lasers and optics | detectors and electronics | ThomX igloo | High frequency noise | Today, the lock of the FPC was particularly
bad (maybe the worst ever seen), with a lot
of high frequency noise. |
|
|
458
|
Wed Oct 1 10:14:12 2025 |
Ronic Chiche | Fixed | issue | lasers and optics | detectors and electronics | ThomX igloo | High frequency noise | At the end of the day, we found out what
was the origin of this noise : some road
renovation work with jackhammer and road |
|
|
459
|
Tue Oct 28 10:07:48 2025 |
Ronic Chiche | Fixed | issue | lasers and optics | detectors and electronics | ThomX igloo | High frequency noise | After this observation, we did a test with
Daniele to try to correlate the road traffic
in front of the Igloo with the lock losses |
|
|
460
|
Tue Oct 28 17:31:47 2025 |
Ronic Chiche | Fixed | issue | lasers and optics | detectors and electronics | ThomX igloo | High frequency noise | we did some tests with Marie to make some
vibrations on the door.
below, I exhibit some pictures of |
|
|
461
|
Mon Dec 1 18:03:29 2025 |
Ronic Chiche | Fixed | report | lasers and optics | detectors and electronics | ThomX igloo | Noise issue | since several days, we see that the locking
is more and more unstable and the lock duration
was sometime less than 20-30 seconds ! |
|
|
462
|
Wed Dec 3 16:23:40 2025 |
Ronic Chiche | Fixed | report | lasers and optics | detectors and electronics | ThomX igloo | Noise issue | yesterday, in the same conditions, we had
so many locking issues... exactly
in the same way than before. :-( |
|
|
463
|
Mon Dec 8 11:17:17 2025 |
Ronic Chiche | Fixed | issue | lasers and optics | detectors and electronics | ThomX igloo | High frequency noise | This morning, I installed a high-voltage
probe (1:1000) on the AC-line to see if one
could detect a correlation between lock losses |
|