News from the RMR-Lidar 2010/2011 ASAC meeting Norderstedt 21./ G. Baumgarten et al.

Telescope Field of View tests NWT Removed polarizer from NWT, using pol. branch for FOV tests 1.5 mm fiber: 180 µrad up to mm fiber: 120 µrad – mm fiber: 60 µrad – mm fiber: 96 µrad since

CamServer/Client on tel-srv2 Green=goodyellow=clouds?red=off Laser image BGM steps NWT CamClient CamServe r SET CamClient Distance to target Server timing BGM commands

Performance of new system Analysis of 40 or 50 images (25/s, ~2 s) for BGM3 steps (two motors) Analysis of 40 or 50 images (25/s, ~2 s) for BGM3 steps (two motors) 1 s timeout after motor command 1 s timeout after motor command Stabilization (1µrad : 100km) Stabilization (1µrad : 100km) – average 5 µrad NWT – average 10 µrad SET – Peaks 30 µrad Beam deviations mostly caused by air turbulence at low altitudes (wind) Beam deviations mostly caused by air turbulence at low altitudes (wind)

526th ALOMAR RMR-Lidar meeting - Norderstedt Optical Bench 2011

626th ALOMAR RMR-Lidar meeting - Norderstedt New Etalon Motor + Piston Etalon

726th ALOMAR RMR-Lidar meeting - Norderstedt New Etalon Housing

826th ALOMAR RMR-Lidar meeting - Norderstedt Etalon test measurements2010

926th ALOMAR RMR-Lidar meeting - Norderstedt Etalon test measurements2010

1026th ALOMAR RMR-Lidar meeting - Norderstedt Optical bench status and outlook Improvement: only one Etalon T=75% easy to align Improvement: only one Etalon T=75% easy to align replacement of 532 nm detectors lower darkcount < 25Hz, lower deadtime ~30 ns replacement of 532 nm detectors lower darkcount < 25Hz, lower deadtime ~30 ns replacement of 355 nm detectors higher QE~40%, darkcount <30 Hz replacement of 355 nm detectors higher QE~40%, darkcount <30 Hz

ALOMA R RMR- Lidar – Norderst edt, Instrument Network Communication (INC) internal RMR-lidar network: *.rmrlidar.rocketrange.no rmr-srv ( ) las-srv ( ) las-bm1 ( ) las-bm2 ( ) tel-srv1 ( ) tel-srv2 ( ) daq-atmos ( ) daq-spec ( ) power controller Control Room ( ) power controller Detection Room ( ) communication types port based (pb) file based (fb)

ALOMA R RMR- Lidar – Norderst edt, computers involved: 8 port based communication servers:17 clients:22 file based communication: several scripts INC: Summary

ALOMA R RMR- Lidar – Norderst edt, Installation of Newport NewStep motor for handling of /2 plate at HG of laser#1. Lasers: Maintenance July/August 2010

ALOMA R RMR- Lidar – Norderst edt, Lasers: Maintenance July/August 2010 Exchange of flash lamps. laser#1: 53 M pulses laser#2: 53 M pulses Sealing of flow regulator in power supply of laser#1 due to leakage.

ALOMA R RMR- Lidar – Norderst edt, Lasers: Maintenance March 2011 Exchange of flash lamps. laser#1: 43 M pulses laser#2: 40 M pulses Exchange of primary mirror at beam widening telescope on laser table#2 holes in coating, also at 45° mirrors => probably singular seeding problem Connection of lasers to the new observatory N2 purge system

ALOMA R RMR- Lidar – Norderst edt, Lasers: Maintenance March 2011 Exchange of iodine cell in seeder box due to observed strange behavior of absorption spectrum. old cell: usage since 1994, solid iodine at 40°C new cell: all iodine in gas phase at 40°C (by eye) Logging of 2 additional IR energies in seeder box, now: seeder head laser#1 group laser#2 group

ALOMA R RMR- Lidar – Norderst edt, Lasers: Misc Shutdown of seeder control PC, program runs now on laser control PC: saving of computer maintenance and energy runs now as executable created with LabVIEW 8.6 Mobile Laser Status

1826th ALOMAR RMR-Lidar meeting - Norderstedt Data base measurement statistics and system performance

measurement statistics 1994 – th ALOMAR RMR-Lidar meeting - Norderstedt

2026th ALOMAR RMR-Lidar meeting - Norderstedt Measurements 2010/2011 Single / Twin / DoRIS : Jan RMR-Meeting: 122 h 2010: Jan RMR-Meeting: 220 h 2011: Jan RMR-Meeting: 100 h

2126th ALOMAR RMR-Lidar meeting - Norderstedt Daily max. Signal

2226th ALOMAR RMR-Lidar meeting - Norderstedt Monthly mean max signal 2008 – 2011

2326th ALOMAR RMR-Lidar meeting - Norderstedt Monthly mean max signal 2008 – 2011

2426th ALOMAR RMR-Lidar meeting - Norderstedt Monthly mean background 2008 – 2011

2526th ALOMAR RMR-Lidar meeting - Norderstedt Monthly mean max signal 2008 – 2011

2626th ALOMAR RMR-Lidar meeting - Norderstedt Monthly mean max signal 2008 – 2011

2726th ALOMAR RMR-Lidar meeting - Norderstedt Data summary 61% of measurements performed under daylight conditions. 61% of measurements performed under daylight conditions. Most measurements performed with DoRIS, preferably N,E. Most measurements performed with DoRIS, preferably N,E. Time resolution 30 seconds. Time resolution 30 seconds.

2826th ALOMAR RMR-Lidar meeting - Norderstedt ALOMAR level1 datafiles Signal corr. For nonlinearity / background removed + Uncertainty (1.4 GB/24h w/o raman channels) Level 1a: Gridded in 5 min time slots / 150 m altitude (35 MB/24h) Level1a Level2 ?

2926th ALOMAR RMR-Lidar meeting - Norderstedt Future activities Summer 2011

3026th ALOMAR RMR-Lidar meeting - Norderstedt IAP RMR-Lidar operations summer 2011 NLC campaign : – Met. Rockets May 2011?