1. News from the RMR-Lidar 2010/2011 ASAC meeting Norderstedt 21./22.03.2011 G. Baumgarten et al.

2. Telescope Field of View tests NWT Removed polarizer from NWT, using pol. branch for FOV tests 1.5 mm fiber: 180 µrad up to 20.12.2010 1.0 mm fiber: 120 µrad 20.12. – 25.01.2010 0.5 mm fiber: 60 µrad 25.01. – 16.02.2011 0.8 mm fiber: 96 µrad since 16.02.2011

3. 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

4. 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 : 10cm @ 100km) Stabilization (1µrad : 10cm @ 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)

5. 526th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 Optical Bench 2011

6. 626th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 New Etalon Motor + Piston Etalon

7. 726th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 New Etalon Housing

8. 826th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 Etalon test measurements2010

9. 926th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 Etalon test measurements2010

10. 1026th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 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

11. ALOMA R RMR- Lidar – Norderst edt, 2011 11 Instrument Network Communication (INC) internal RMR-lidar network: *.rmrlidar.rocketrange.no rmr-srv (192.168.41.10) las-srv (192.168.41.21) las-bm1 (192.168.41.23) las-bm2 (192.168.41.24) tel-srv1 (192.168.41.41) tel-srv2 (192.168.41.42) daq-atmos (192.168.41.61) daq-spec (192.168.41.62) power controller Control Room (192.168.41.63) power controller Detection Room (192.168.41.64) communication types port based (pb) file based (fb)

12. ALOMA R RMR- Lidar – Norderst edt, 2011 12 computers involved: 8 port based communication servers:17 clients:22 file based communication: several scripts INC: Summary

13. ALOMA R RMR- Lidar – Norderst edt, 2011 13 Installation of Newport NewStep motor for handling of /2 plate at HG of laser#1. Lasers: Maintenance July/August 2010

14. ALOMA R RMR- Lidar – Norderst edt, 2011 14 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.

15. ALOMA R RMR- Lidar – Norderst edt, 2011 15 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

16. ALOMA R RMR- Lidar – Norderst edt, 2011 16 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

17. ALOMA R RMR- Lidar – Norderst edt, 2011 17 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

18. 1826th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 Data base measurement statistics and system performance

19. measurement statistics 1994 – 2010 1 2 3 6 1926th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011

20. 2026th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 Measurements 2010/2011 Single / Twin / DoRIS 2010 2009: Jan RMR-Meeting: 122 h 2010: Jan RMR-Meeting: 220 h 2011: Jan RMR-Meeting: 100 h

21. 2126th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 Daily max. Signal

22. 2226th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 Monthly mean max signal 2008 – 2011

23. 2326th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 Monthly mean max signal 2008 – 2011

24. 2426th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 Monthly mean background 2008 – 2011

25. 2526th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 Monthly mean max signal 2008 – 2011

26. 2626th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 Monthly mean max signal 2008 – 2011

27. 2726th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 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.

28. 2826th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 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 ?

29. 2926th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 Future activities Summer 2011

30. 3026th ALOMAR RMR-Lidar meeting - Norderstedt20.03.2011 IAP RMR-Lidar operations summer 2011 NLC campaign :31.05.2010 – 20.08.2010 Met. Rockets May 2011?