Atacama Pathfinder EXperiment APEX
LABOCA Calibration
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Home > Instrumentation > LABOCA > LABOCA Calibration > Array parameters

Array parameters August 2013
(19/08-22/08)

LABOCA was cooled down during Swedish time in August, but warmed up again while the telescope was not reachable during a snowstorm.

Main parameter file: laboca-2013-08.rcp

Individual scans

Scan #Date Parameter fileArray plotIndividual channel maps
54306 2013-08-19T07:32 Uranus_54306_Laboca.rcp array_54306.pdf beams_54306.pdf

Notes on individual channels

Note: Channels which are terminated with a resistor are not listed in the following table anymore.
Also, from 2013 onward channel #241 is listed under "bad channels" and not under "cross-talk", since the cross-talkers may be usable for point sources, while #241 is not usable at all.

Compared to April and June 2013, the channels 257 and 307 now seem to be bad, while 309 was okay during the beammap.

Channel #Description
101, 103, 106, 110 Strong cross-talk: 101↔106 and 103↔110. 101 and 103 may be usable for point sources only.
81, 82, 83, 84, 85, 86, 89, 90, 91, 92, 93, 94, 96, 136, 159, 160 Channels located in group 4 / cable M. These channels usually don't show any astronomical signal and are considered bad.
177, 179, 180, 182, 183, 184, 185, 191, 192, 201, 202, 203, 205, 207, 217, 218, 220 Channels located in group 7 / cable A. These channels don't show astronomical signal and are considered bad.
6, 45, 114, 133, 199, 204, 206, 208, 211, 213, 219, 228, 241, 257, 307 Bad channels, not showing any astronomical signal or very low signal levels, unconnected to groups 4 or 7 above.

channel_flags-2013-08.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 = [ 101, 103, 106, 110 ]
# Bad channels (no/low signal)
bad = [ 6,  45,  81,  82,  83,  84,  85,  86,  89,  90,  91,  92,  93,  94,
       96, 114, 133, 136, 159, 160, 177, 179, 180, 182, 183, 184, 185, 191,
      192, 199, 201, 202, 203, 204, 205, 206, 207, 208, 211, 213, 217, 218,
      219, 220, 228, 241, 257, 307 ]