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LABOCA Calibration
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Home > Instrumentation > LABOCA > LABOCA Calibration > Array parameters

Array parameters October 2007 (29/09-09/10)

After the investigation of a vacuum leak which appeared mid-September, LABOCA was cooled down on 28th of September. Around mid-October, a support structure to use with CHAMP+ tests was mounted in the C-cabin. This structure covered partly the LABOCA FoV.

Main parameter file: laboca-2007-10.rcp

Individual scans

Scan #Date Parameter fileArray plotIndividual channel maps
38392 2007-10-02T10:05 Mars_38392_Laboca.rcp array_38392.pdf beams_38392.pdf
39522 2007-10-08T12:16 Mars_39522_Laboca.rcp array_39522.pdf beams_39522.pdf
39761 2007-10-09T08:56 Mars_39761_Laboca.rcp array_39761.pdf beams_39761.pdf

Notes on individual channels

Channel #Description
101, 103, 106, 110, 205, 218 Strong cross-talk: 101↔106, 103↔110, & 205↔218.
241 No proper signal. Picks up signal from channels 248 (strong) and 296 (weak).
81-83, 84, 85, 86, 87-92, 93, 94-96, 135, 136, 142, 145, 150, 151, 157-160 Channels located in group 4 / cable M. All active channels pick up signal from channel 136 (cross-talk). Channels 84, 86, 93, and 136 are considered bad.
6, 179, 183, 184, 191, 192, 201, 204, 207, 228 Bad (noisy or insensitive) channels.

channel_flags-2007-10.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
# 7 channels show strong cross-talk
cross = [ 101, 103, 106, 110, 205, 218, 241 ]
# Bad channels (no or very weak astronomical signal)
bad = [ 6, 84, 86, 93, 136, 179, 183, 184, 191, 192, 201, 204, 207, 228 ]
# Remaining bolometers on cable M / group 4 (cross-talk)
cable_M = [ 81, 82, 83, 85, 89, 90, 91, 92, 94, 96, 159, 160 ]
cross = cross + cable_M