news from the rmr-lidar 2010/2011 asac meeting norderstedt 21./22.03.2011 g. baumgarten et al
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News from the RMR-Lidar 2010/2011ASAC meeting
Norderstedt 21./22.03.2011
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 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
CamServer/Client on tel-srv2Green=goodyellow=clouds?red=off Laser image BGM steps
NWT CamClient
CamServer
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)
• 1 s timeout after motor command
• 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)
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Optical Bench 2011
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New Etalon
Motor + Piston
Etalon
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New Etalon Housing
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Etalon test measurements 2010
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Etalon test measurements 2010
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Optical bench status and outlook
• Improvement: only one Etalon T=75%easy to align
• replacement of 532 nm detectorslower darkcount < 25Hz, lower deadtime ~30 ns
• replacement of 355 nm detectorshigher QE~40%, darkcount <30 Hz
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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)
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• computers involved: 8
• port based communication
- servers: 17- clients: 22
• file based communication: several scripts
INC: Summary
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• Installation of Newport “NewStep” motor for handling of l/2 plate at HG of laser#1.
Lasers: Maintenance July/August 2010
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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.
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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
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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
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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
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Data base
measurement statisticsand
system performance
measurement statistics 1994 – 2010
1
23
6
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Measurements 2010/2011
Single / Twin / DoRIS
2010
2009: Jan → RMR-Meeting: 122 h2010: Jan → RMR-Meeting: 220 h2011: Jan → RMR-Meeting: 100 h
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Daily max. Signal
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Monthly mean max signal 2008 – 2011
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Monthly mean max signal 2008 – 2011
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Monthly mean background 2008 – 2011
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Monthly mean max signal 2008 – 2011
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Monthly mean max signal 2008 – 2011
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Data summary
• 61% of measurements performed under daylight conditions.
• Most measurements performed with DoRIS, preferably N,E.
• Time resolution 30 seconds.
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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 ?
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Future activities
Summer 2011
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IAP RMR-Lidar operations summer 2011
NLC campaign : 31.05.2010 – 20.08.2010
Met. Rockets May 2011?