08:50 am open dewar refill to full

09:45 am open dewar refill to full, TPC pressure 31 mbar

09:47 Heat gun ON, TPC pressure 261 mbar, recirculation pressure 252 mbar

11:00 Building 182 liquid argon tower refiiled

11:20 Refill open dewar to 70/120 cm

11:36 TPC pressure 218 mbar, recirculation pressure 214 mbar

08:40, switch on heat gun, open dewar liquid level 50/120 (cm)

16:30, open dewar is refilled to 70/120 (cm)

21:40, switch off heat gun, open dewar liquid level 60/120 (cm)

Nov 04  in the morning, start using heat gun to blow the liquid argon in the open dewar, in order to rise the pressure difference between the TPC and the condenser.

Nov 04 fast circulating for 7 hours, pressure difference ~90 mbar

Nov 05 fast circluating for 10 hours, pressure difference ~90 mbar

Start at 09:35 am, open dewar liquid level 40/120

Stop at 08:20 pm, for the evening data taking

There was a possible power blackout on Nov 9 from 2 am to 4 am at builidng 182.

During the blackout, the vacuum pump for pumping the insulation vacuum of the cryogenic system was OFF.

Moistures were accumulated in the interlayer during these two hours, and now the vacuum insulation is not as good as before.

This causes some bubbles generating in the liquid delivery bellow and significantly reduces the fast recirculation speed.

9:00 am open dewar refilled to full, TPC pressure 30 mbar

09:29 Heat Gun ON

09:30 TPC 259 mbar Recirculation 257 mbar

10:03 TPC 382 mbar Recirculation 326 mbar

10:31 TPC 421 mbar Recirculation 333 mbar

11:06 TPC 465 mbar Recirculation 373 mbar

11:21 refil condenser, refill open dewar to 70/120 cm

11:37 TPC 311 mbar, Recirculation 274 mbar

12:01 TPC 261 mbar, Recirculation 249 mbar

13:07 TPC 292 mbar, Recirculation 264 mbar

13:33 TPC 310 mbar, Recirculation 276 mbar

10:20 Heater gun on

10:20 TPC 230 mbar Recirculation 241 mbar

10:59 TPC 391 mbar Recirculation 345 mbar

11:28 TPC 419 mbar Recirculation 360 mbar

11:59 TPC 425 mbar Recirculation 366 mbar

12:24 Refill open dewar to 80/120 cm

12:31 TPC 389 mbar Recirculation 344 mbar

13:02 TPC 98 mbar Recirculation 99 mbar

13:30 TPC 204 mbar Recirculation 198 mbar

14:01 TPC 292 mbar Recirculation 294 mbar

14:30 TPC 231 mbar Recirculation 223 mbar

14:57 TPC 286 mbar Recirculation 284 mbar

09:25 Heat gun ON

09:40 TPC pressure 241 mbar, recirculation pressure 231 mbar

10:45 TPC pressure 327 mbar, recirculation pressure 301 mbar

11:34 TPC pressure 318 mbar, recirculation pressure 289 mbar

12:08 TPC pressure 322 mbar, recirculation pressure 286 mbar

13:54 TPC pressure 300 mbar, recirculation pressure 288 mbar

09:39 heat gun on

12:37 TPC pressure 350 mbar, recirculation pressure 338 mbar

13:50 TPC pressure 336 mbar, recirculation pressure 315 mbar

09:30 Heat Gun ON

09:40 TPC pressure 293 mbar, recirculation pressure 277 mbar

10:20 open dewar refill to 70/120 cm

10:24 TPC pressure 264 mbar, recirculation pressure 241 mbar

13:40 TPC pressure 313 mbar, recirculation pressure 284 mbar

09:12 am MB OFF, LED ON, start forming gas pocket

10:46 am Gas pocket 7mm thick, LED OFF, MB ON

Argon refills of the open bath are suspended in order to increase the deltaP between the TPC and the recirculation vessel, in order to force gas recirculation through the oxygen-sorption filter. The goal is to see S2 signal.

Currently the pressure is stable, fluctuations seezed over night. DeltaP very low, ~5 mbar.

Up to now (last check evening of November 1) sporadic noise with high amplitude and frequency ~50kHz was suddenly appearing when the FEBs are turned on, forcing to stop the data acquisiton.

Gas pocket: ON

Fields: ON

SiPMs: OFF

FEBs: OFF

DAQ: idle

LAr level in the open bath: >1/2

14:00 TPC 330 mbar Recirculation 290 mbar. Liquid argon level in bath 65 cm 

15:00 TPC 335 mbar Recirculation 300 mbar. 

16:11 TPC 373 mbar Recirculation 333 mbar. 

17:26 TPC  330 mbar Recirculation 280 mbar. 

18:21 TPC  330 mbar Recirculation 280 mbar. 

19:10 Heat gun off 

20:40 TPC  225 mbar Recirculation 225 mbar. 

21:46 TPC  238 mbar Recirculation 242 mbar. 

Bubbler: 8.5 V, 5.2 mA

External LAr level: 60 cm 

14:34 TPC pressure 300 mbar , recirculation pressure 287 mbar 

15:00 Heaters off for S1 data taking 

15:30 TPC pressure 350 mbar , recirculation pressure 340 mbar 

16:24 TPC pressure 330 mbar , recirculation pressure 320 mbar 

17:20 TPC pressure 380 mbar , recirculation pressure 320 mbar 

18:28 TPC pressure 365 mbar , recirculation pressure 305 mbar 

18:40 Heaters on to generate gas pocket  

19:31 TPC pressure 345 mbar , recirculation pressure 285 mbar 

19:34 Heat gun off. Condenser refilled

20:14 TPC pressure 250 mbar , recirculation pressure 240 mbar 

21: 42 

TPC pressure (mbar):  230

Recirculation pressure (mbar): 220

Open dewar level ( cm/120cm): 55 cm 

Bubbler:   8.56 V          current : 5.1 mA

14:47 TPC pressure 330 mbar Recirculation pressure: 290 mbar 

15:35 TPC pressure 345 mbar Recirculation pressure: 300 mbar 

16:35 TPC pressure 440 mbar Recirculation pressure: 400 mbar 

16:43 Heat gun off 

18:04  TPC pressure 230 mbar Recirculation pressure: 230 mbar 

18:55  TPC pressure 250 mbar Recirculation pressure: 250 mbar 

Bubbler 8.4 V 5.1 mA 

LAr bath level 55 cm 

MB OFF 

LED ON 

15:36 TPC 320 mbar Recirculation 320 mbar

16:01 TPC 313 mbar Recirculation 313 mbar

16:31 TPC 235 mbar Recirculation 225 mbar

17:02 TPC 259 mbar Recirculation 258 mbar

17:33 TPC 270 mbar Recirculation 261 mbar

18:06 TPC 322 mbar Recirculation 319 mbar

Checked pressure regularly, steadily climbed from 15:00-19:00

19:00: TPC: 461 mbar   Recirculation 397 mbar

19:23: Dewar Level 40cm

19:23: Refill open dewar

19:33: Dewar leve 60cm, TPC pressure 201 mbar Recirculation pressure 201 mbar