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

Array parameters November 2011 (20/10-23/12)

After being kept at nitrogen temperature for 10 days, LABOCA was cooled down again to helium temperature to be ready for observations for the second half of the MPI time block. It was in use starting the 20th of October until a period of bad weather over Christmas.

Main parameter file: laboca-2011-11.rcp

Individual scans

Scan #Date Parameter fileArray plotIndividual channel maps
84655 2011-11-21T23:39 Uranus_84655_Laboca.rcp array_84655.pdf beams_84655.pdf
85243 2011-11-24T12:20 Mars_85243_Laboca.rcp array_85243.pdf beams_85243.pdf
86756 2011-12-01T07:38 Mars_86756_Laboca.rcp array_86756.pdf beams_86756.pdf

Notes on individual channels

Note: Channels which are terminated with a resistor are not listed in the following table anymore.

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. Channels 92 and 93 are variable, the latter may be usable.
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 mostly don't show astronomical signal and are considered bad.
6, 114, 133, 199, 204, 206, 208, 211, 213, 228, 309 Bad channels, not showing any astronomical signal or very low signal levels, unconnected to groups 4 or 7 above.
241 No proper signal. Picks up signal from channels 248 (strong) and 296 (weak).

channel_flags-2011-06.boa:
The channels which have to be considered bad are identical to those in period 2011-06. Thus the same macro can be used for flagging them.

# 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, 241 ]
# Bad channels (no/low signal)
bad = [ 6,  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, 220, 228, 309 ]