Atacama Pathfinder EXperiment APEX
LABOCA Calibration
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Array parameters October 2008 (22/09-02/11)

LABOCA was kept at Nitrogen temperature between the 8th and 22nd of September. It was cooled down afterwards and was operational without interruption until November 2nd.

Only two beam maps were observed during this period, with the second one suffering slightly from atmospheric instabilities. Since no mechanical work was performed at LABOCA between August and October, we don't expect the channel offsets to have changed. You therefore may also use the offsets obtained in August for your data reduction.

Main parameter file: laboca-2008-10.rcp

Individual scans

Scan #Date Parameter fileArray plotIndividual channel maps
55636 2008-10-22T01:29 Uranus_55636_Laboca.rcp array_55636.pdf beams_55636.pdf
57408 2008-10-28T00:43 Uranus_57408_Laboca.rcp array_57408.pdf beams_57408.pdf

Notes on individual channels

Channel #Description
103, 110 Strong cross-talk: 103↔110.
81-96, 135, 136, 142, 145, 150, 151, 157-160 Channels located in group 4 / cable M. No signal/noisy and/or cross-talk with channel 90.
6, 82-84, 90, 98, 101, 106, 160, 179, 183-185, 191, 192, 202, 217, 220, 257 Bad channels not showing any astronomical signal.
201, 205, 207, 218, 228, 309 Insensitive channels, showing very low signal levels.
51, 108 Suspicious channels (sometimes noisy, sometimes not)
241 No proper signal. Picks up signal from channels 248 (strong) and 296 (weak).

channel_flags-2008-10.boa:

# 25 channels not connected to any bolometer
not_connected = [ 29,  33,  35,  40,  64,  66, 124, 135, 142, 144, 146, 151, 158,
                 189, 193, 195, 200, 224, 226, 284, 295, 302, 304, 306, 311 ]
# 20 channels with 1MOhm resistor
resistor = [  15,  16,  87,  88,  95, 139, 143, 145, 149, 150, 157, 178,
             181, 186, 187, 188, 190, 255, 310, 317 ]
# 2 channels sealed with an absorber
blind = [ 4, 163 ]
sealed = blind
# channels showing strong cross-talk
cross = [ 103, 110, 241 ]
# Bad channels (no signal or noisy)
bad = [  6,  82,  83,  84,  90,  98, 101, 106, 160, 179, 183, 184, 185, 191, 192,
       201, 202, 205, 207, 217, 218, 220, 228, 257, 309 ]
# Suspicious channels (sometimes noisy, sometimes not)
bad_maybe = [ 51, 108 ]
# Remaining bolometers on cable M / group 4 (may be noisy or show cross-talk)
cable_M = [ 81, 85, 86, 89, 91, 92, 93, 94, 96, 136, 159 ]