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Daily Reports

Observers on-site: Maite Beltrán, Anaëlle Maury, Andrés Zuleta, Rodrigo Álvarez and Angel (AoD). Dave, Carlos and Jean supporting on-site (Tuesday, maintenance slot).

Operators: Gloria (day shift) and Sergio (night shift)

Jan 28th, Tuesday

14:00-16:00; Angel. No system check. NIKA2 and subsystems in good shape. Very bad weather (collateral effects of the storm Herminia; Ivo is coming). EMIR checks of high-frequency signal of external calibrator pending.

16:00-19:00; Rodrigo. Clear skies and tau_225GHz~0.15 after the last storm. Taumeter's external box wiped. Deicing system at work.

19:00-02:00: Anaëlle & Andrés. Sergio inspected the telescope from the platform (~19:30 LT). Ambient temp. -10C. Hard ice block on the upper third of the subreflector. A thumb-thick ice layer on the lower-half of M1. Telescope stopped.

Jan 29th, Wednesday

02:00-06:00; Angel: Ice on M1 and M2. Deicing active. Telescope stopped.

06:00-13:00; Maite: Antenna still stopped at 06:00. Deicing active all night but not properly working in some sectors (e.g., 8 and 3). Sergio moved the antenna to sun rising direction and waiting. Opacity at 0.3 and rising. \\

- 08:00: Cloudy skies, opacity 0.3. Waiting. Still ice on the bottom side of the antenna.

- 12:45: Ice almost melted. Wind gusts 15 m/s. Opacity 0.26.

- 13:00: We will start with test on EMIR.

13:00-19:00: Rodrigo: tests using t07, pointing, onoff_psw. Antenna parked due to high winds (14:00).

• 16:00. Testing pointing t07, bad results, parking antenna.

19:00-02:00: Anaëlle & Andrés. Snow and wind. Telescope parked.

Jan 30th, Thursday

02:00-06:00; Angel: Snow storm, high wind with a brief stop at ~01:30 (LT). Ambient temp. -9C. Deicing fully working, except for sector 8 (see below). Waiting for a sunny morning for defrosting. Light fog at the end of the shift.

06:00-13:00; Maite: Stopped snowing but we are in the clouds. Deicing working, waiting for the Sun. Temperature -10C.

- 12:00: Still plenty of ice on antenna surface. The wind does not allow to use the platform to clean the secondary.