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

Array parameters April 2013
(17/03-15/05)

Main parameter file: laboca-2013-04.rcp

Individual scans

Scan #Date Parameter fileArray plotIndividual channel maps
8947 2013-03-18T04:01 Carina_8947_Laboca.rcp array_8947.pdf beams_8947.pdf
8989¹ 2013-03-18T05:51 Carina_8989_Laboca.rcp array_8989.pdf beams_8989.pdf
19096 2013-04-10T01:03 Carina_19096_Laboca.rcp array_19096.pdf beams_19096.pdf
19097 2013-04-10T01:23 Carina_19097_Laboca.rcp array_19097.pdf beams_19097.pdf
27692 2013-05-04T05:32 Saturn_27692_Laboca.rcp array_27692.pdf beams_27692.pdf
29111 2013-05-08T16:30 Uranus_29111_Laboca.rcp array_29111.pdf beams_29111.pdf
 ¹ This scan is not considered for the averaged parameter file because of instabilities in the middle of the scan. Those were possibly caused by some passing clouds or something similar.

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.

In summary, even if channels #65 and #257 seem to be a bit more unstable than before, the bad channels have not changed compared to November 2012.

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, 309 Bad channels, not showing any astronomical signal or very low signal levels, unconnected to groups 4 or 7 above.
65, 77, 246, 257 These channels are variable and usually usable. Check your data.

channel_flags-2013-04.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)
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, 309 ]