Atacama Pathfinder EXperiment APEX
LABOCA Calibration
MPIfR Bonn   ESO   Onsala Space Observatory
  APEX TWIKI CONTACT SEARCH HELP NEWS DISCLAIMER

Home > Instrumentation > LABOCA > LABOCA Calibration > Array parameters

Array parameters April 2015
(21/03-24/04)

Main parameter file: laboca-2015-04.rcp

Individual scans

Scan #Date Parameter fileArray plotIndividual channel maps
6260 2015-03-23T05:00 Saturn_6260_Laboca.rcp array_6260.pdf beams_6260.pdf
9218 2015-04-04T03:53 Saturn_9218_Laboca.rcp array_9218.pdf beams_9218.pdf
13458 2015-04-14T05:12 Saturn_13458_Laboca.rcp array_13458.pdf beams_13458.pdf

Notes on individual channels

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

Channel 183 is present in BeamMaps 6260 and 9218 but it is a bad channels in BeamMap 13458, channel not considered in the LABOCA rcp file. The rest of channels looks like the previous period (2015-09-16 to 2015-10-21).

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.
114, 116, 117, 118, 119, 120, 126, 128, 129, 130, 131, 132, 133, 134, 141, 147, 148, 152, 153, 154, 155, 156 Channels located in group 5 / cable L. These channels don't show astronomical signal (factor 20 below normal) 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/or cross-talk and are considered bad.
6, 45, 170, 199, 204, 206, 208, 211, 213, 219, 228, 241, 309 Bad channels, not showing any astronomical signal or very low signal levels, unconnected to groups 4, 5, or 7 above.

channel_flags-2015-04.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 or very high noise)
bad = [ 6,  45,  81,  82,  83,  84,  85,  86,  89,  90,  91,  92,  93,  94,
       96, 114, 116, 117, 118, 119, 120, 126, 128, 129, 130, 131, 132, 133,
      134, 136, 141, 147, 148, 152, 153, 154, 155, 156, 159, 160, 170, 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, 309 ]