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

Array parameters April 2011 (22/02-27/05)

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Main parameter file: laboca-2011-04.rcp

Individual scans

Scan #Date Parameter fileArray plotIndividual channel maps
10157 2011-03-23T01:38 Saturn_10157_Laboca.rcp array_10157.pdf beams_10157.pdf
10392 2011-03-24T04:55 Saturn_10392_Laboca.rcp array_10392.pdf beams_10392.pdf
11006 2011-03-26T01:29 Saturn_11006_Laboca.rcp array_11006.pdf beams_11006.pdf
11459 2011-03-27T07:57 Saturn_11459_Laboca.rcp array_11459.pdf beams_11459.pdf
11462 2011-03-27T08:23 Saturn_11462_Laboca.rcp array_11462.pdf beams_11462.pdf
11702 2011-03-29T02:31 Saturn_11702_Laboca.rcp array_11702.pdf beams_11702.pdf
11822 2011-03-29T03:59 Saturn_11822_Laboca.rcp array_11822.pdf beams_11822.pdf
11839 2011-03-29T05:20 Saturn_11839_Laboca.rcp array_11839.pdf beams_11839.pdf
11862 2011-03-29T06:55 Saturn_11862_Laboca.rcp array_11862.pdf beams_11862.pdf
11880 2011-03-29T08:25 Saturn_11880_Laboca.rcp array_11880.pdf beams_11880.pdf
21127 2011-04-23T03:34 Saturn_21127_Laboca.rcp array_21127.pdf beams_21127.pdf
24761¹ 2011-05-04T17:02 Uranus_24761_Laboca.rcp array_24761.pdf beams_24761.pdf
27244 2011-05-14T01:06 Saturn_27244_Laboca.rcp array_27244.pdf beams_27244.pdf
27246 2011-05-14T01:28 Saturn_27246_Laboca.rcp array_27246.pdf beams_27246.pdf
 ¹ This scan is not considered for the averaged parameter file because of its low S/N. The observations were performed in the afternoon with a rather unstable atmosphere.

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 93 and 159 are variable, but (even when ok) they pick up signal from other channels and are therefore usable only for very compact sources.
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, 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).
222, 257 These channels are somewhat noisy, but usable (they will be weighted down by the data reduction software).

channel_flags-2011-04.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, 241 ]
# Bad channels (no/low signal)
bad = [ 6,  81,  82,  83,  84,  85,  86,  89,  90,  91,  92,  93,  94,  96, 114,
      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 ]