| ID |
Date |
Author |
Status |
Type |
Category |
Location |
Title |
Text |
 |
|
313
|
Tue Jan 16 12:19:35 2024 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | software | ThomX igloo | Restarting equipements after Christmas shutdown | on last friday (12/01/2024), the IcePap
DS issue was solved and I was able to control
the FP-cavity motors properly. |
|
|
314
|
Tue Jan 16 12:26:12 2024 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | 33MHz (FP-cavity vs RF) phase stability | this morning, with Vincent Chaumat, we
made a beating (phase detection) between
the laser 33MHz and the 33MHz coming from |
|
|
315
|
Fri Jan 19 18:05:42 2024 |
Ronic Chiche | Fixed | info | detectors and electronics | ThomX igloo | Adding one photodiode in reflection | this morning, I added a DET36 photodiode
in reflection (I used a thin beam splitter)
to better measure the coupling over the full |
|
|
316
|
Thu Jan 25 10:15:28 2024 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | cabling | ThomX igloo | controller M1 & M4 (plan mirrors) with IcePap controllers | previously, we have connected motor M4
with an IcePap controller.
see this post : https://elog.lal.in2p3.fr/FPC/THOMX+commissioning/278 |
|
|
317
|
Thu Jan 25 12:45:41 2024 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | cabling | ThomX igloo | controller M1 & M4 (plan mirrors) with IcePap controllers | this double motors scheme works good.
if motor P4 is used by increasing
value, the FP-cavityPZT signal (pink signal |
|
|
318
|
Thu Jan 25 13:36:35 2024 |
Ronic Chiche | Fixed | info | detectors and electronics | ThomX igloo | First stable X-rays production | this morning, we locked the laser on the
FP-cavity with about 48-49kW stable in the
FP-cavity (for 32% of amplifier ratio). |
|
|
319
|
Fri Jan 26 11:05:27 2024 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | cabling | ThomX igloo | controller M1 & M4 (plan mirrors) with IcePap controllers | at the begining of each session, it will
be mandatory to avoid any backlash for the
motors : |
|
|
320
|
Fri Jan 26 13:04:56 2024 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | 33MHz (FP-cavity vs RF) phase stability | today, I locked the laser on the
FP-cavity and the FP-cavity on the RF reference
with 47kW inside the FP-cavity. |
|
|
321
|
Thu Feb 1 17:23:23 2024 |
Ronic Chiche | Fixed | info | detectors and electronics | ThomX igloo | locking | during the last days we changed the FP-cavity
- RF reference locking system to force the
right bucket: |
|
|
322
|
Fri Feb 2 11:53:40 2024 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | ThomX igloo | Laser cavity temperature/pressure sensitivity | this morning, I did a 500MHz beating frequency
(Laser vs RF) drift test with the Smaract
motors configured with "Sensor Mode" |
|
|
323
|
Wed Feb 7 18:33:42 2024 |
Ronic Chiche | Fixed | info | detectors and electronics | Optical room | lock oscillateur 33MHz - synthé 500MHz | This morning with Daniele, we changed the
laser/RF locking scheme :
1) we use the laser 33MHz internal |
|
|
324
|
Fri Feb 9 09:50:45 2024 |
Ronic Chiche | Under Process | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | 20Hz oscillation in the locking between Laser and FP-cavity | yesterday I did 2 tests to try to understand
the origin of the 20Hz oscillation which
is dominant in the remaining 10-20ps rms |
|
|
325
|
Fri Feb 9 15:49:39 2024 |
Ronic Chiche | Under Process | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | 20Hz oscillation in the locking between Laser and FP-cavity | what does this 10ps phase jitter mean in
term of cavity length variations ?
L = L0 + dL sin(2pi fm t) = L0 |
|
|
326
|
Fri Feb 9 18:00:05 2024 |
Ronic Chiche | Under Process | issue | mechanics | lasers and optics | detectors and electronics | ThomX igloo | 20Hz oscillation in the locking between Laser and FP-cavity | measure to be done next week to check the
20Hz noise on the laser amplifier signal:
- install a DET10 in reflection |
|
|
327
|
Fri Mar 1 18:38:17 2024 |
Ronic Chiche | Fixed | info | software | ThomX igloo | correct parameters for locking the FP-cavity | Today, we restarted the FP-cavity locking,
after 3 weeks without using it.
those 3 weeks have been used to set |
|
|
328
|
Mon Mar 4 09:32:06 2024 |
Ronic Chiche | Fixed | info | software | ThomX igloo | correct parameters for locking the FP-cavity | this morning I solved the problem of the
33MHz frequency beating which should be ~12kHz
between the generator (at the new frequency |
|
|
329
|
Mon Mar 4 12:39:56 2024 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | ThomX igloo | Laser and FP cavities frequency adjustment | at the beginning of the procedure, the
frequency gap between the new Ring 33MHz
frequency (33.3378MHz) and the laser/FP cavities |
|
|
330
|
Mon Mar 4 18:32:21 2024 |
Ronic Chiche | Fixed | info | mechanics | lasers and optics | ThomX igloo | Laser and FP cavities frequency adjustment | This afternoon, I did the 2nd half of the
travel: dF @ 33MHz = 0Hz
=> the Smaract motor position is |
|
|
331
|
Tue Mar 5 11:20:43 2024 |
Ronic Chiche | Fixed | info | software | ThomX igloo | correct parameters for locking the FP-cavity | this morning, I finished the FP-cavity
alignment with the new ring RF frequency.
I get back 50kW @ 33% amplifier ratio. |
|
|
332
|
Tue Mar 19 13:01:22 2024 |
Ronic Chiche | Fixed | info | lasers and optics | detectors and electronics | ThomX igloo | FP-cavity lock survey during the Linac section changing operation | This morning with Daniele, we operated
the FP-cavity to be sure there is no issue
due to the Linac section changing operation |
|