Weekly Bosi WSR3 report

WSR3 Report: 

WSR3 Report -- L.B. Bosi -- R.Passaquieti - Cascina 10 October 2006

WSR3 begins Toward STEP 10: 

WSR3 begins Toward STEP 10 The WSR3 officially started with ON CALL: Barsotti, Evans, Mantovani and Ruggi With the interferometer at STEP 4 and locking attempts to STEP 8 Just to warm up before the WSR3: Cables for the translation stages of B2 quadrant (Laser Lab) were reversed – solved by M.Evans & M.Mantovani (19h42). OMC telescope misalignment - E.Tournefirer (21h10), realigned it

Friday Night and Saturday early morningToward STEP 10: 

Friday Night and Saturday early morning Toward STEP 10 Continuing the Friday afternoon activities, part of the night was spent to recover a stable locking sequence to science mode (Thanks Barsotti-Evans) Realignment activity adjust the demodulation phases of B5 and B2_3f in order to survive to the thermal transient Etc.. (ref. talks) At 4h00 local time the ITF was left lock at step 10 for about half an hour, in order to check its robustness. LOGBOOK : Barsotti, Evans 13648 LOGBOOK : Ruggi – 13646 LOGBOOK : Dattilo - 13643 Thanks to Vincenzo Dattilo, we verified in the afternoon the communication misunderstading between Suspension Electronics and the Data Analysis peoples, about the compensation for the UD filters (It would cause the HW Injection activity failure); The followings were done: Dattilo implemented in ALP the switching of LockSW for NI and WI. LockSW is set to 0 as soon as NI and WI are switched to LowNoise mode Ruggi implemented the compensation for the filters in the DSP

Saturday Morning ITF unlocked at step 11 : 

Saturday Morning ITF unlocked at step 11 ON CALL: V.Dattilo and F.Nocera called at 6.30 in order to investigate Passing from step 10 to 11 the ITF unlocks Three different attempts were made to switch the NE and WE coil drivers to low noise.  All resulted in an unlock of the ITF LOGBOOK: Barsotti, Evans 13647

Saturday Morning NE,WE coil drivers offsets: 

Saturday Morning NE,WE coil drivers offsets Passing from step 10 to 11 the ITF unlocks First attempt was to disconnect lateral coils (Left and Right) on both Terminal Towers Considering that this was the first time that enphasys de-enphasys filters were tested, the attention was moved to the coil drivers. Was asked and I insisted for a direct measurement of the offsets on the coil drivers and the activity on these section was started During the morning and afternoon the problem was identified, measured and corrected by Vincenzo and Flavio. This activity finished at 15:30 LOGBOOK: Garufi, Gherardini,Bosi,Dattilo,Nocera 13654 LOGBOOK: Dattilo,Nocera comments 13658 , 13660

Saturday afternoon: Bad weather conditions: 

Saturday afternoon: Bad weather conditions After the removal of the offsets, there were several lock acquisition attempts ON CALL: Barsotti and Evans are called at 15h40 Lock acquisition problems seems to be due to bad weather conditions, further worsening in the afternoon LOGBOOK: Barsotti 13662 LOGBOOK: A.Divirgilio, M.Nassi 13659

Saturday afternoon: Mode-cleaner unlocks – T fluctuations: 

Saturday afternoon: Mode-cleaner unlocks – T fluctuations Around 18h00 the weather was better but mode-cleaner started to unlocks. The failure seems after the run to be related with a large fluctuations in the laser lab temperature (Dattilo). LOGBOOK: Dattilo – 13663 LOGBOOK: Nenci, Gherardini 13667 LOGBOOK: A.Divirgilio, M.Nassi 13659

Saturday evening: GAME OVER: 

Saturday evening: GAME OVER Due to the persisting problems to lock the IMC (After the T fluctuation problem was discovered) Due to the fact that we were confident for the moment to reach step 10 Due to the fact that the found “high noise–low noise solution” was awaiting still for a test  Bosi and Passaquieti declared the run closed. LOGBOOK: A.Divirgilio, M.Nassi 13659 LOGBOOK: Bosi comments 13654

WSR3 what we can learn?: 

WSR3 what we can learn? Hoping that in the future Air, Water, Fire and Earth will not decide to fight still together against us, the experience made during this run puts new questions for the collaboration: Does it make sense to start a weekly SCIENTIFIC run without a STEP 12 (or 10) in the immediately previous hours or days? Probably, have we to ask and consider the opinions of the commissioning coordinator before to start the run? Thanks to the crew and the on-calls that have participated, putting a big effort on trying to achieve the science mode condition for the WSR3