Array parameters December 2007 (16/11-31/12)

By mid-november, we discovered that the mounting structure installed recently in the C-cabin (to be used with CHAMP+ tests or holography) was shadowing a significant fraction (31 channels) of LABOCA's field of view. The structure was removed on November 15th in the afternoon. LABOCA continued to work as expected until the end of December, when we warmed it up at the start of the Bolivian winter.

Main parameter file: laboca-2007-12.rcp

Individual scans

Scan #	Date	Parameter file	Array plot	Individual channel maps
47507	2007-11-16T07:56	Mars_47507_Laboca.rcp	array_47507.pdf	beams_47507.pdf
48118	2007-11-19T08:19	Mars_48118_Laboca.rcp	array_48118.pdf	beams_48118.pdf
48756	2007-11-24T05:27	Mars_48756_Laboca.rcp	array_48756.pdf	beams_48756.pdf
54019	2007-12-21T05:28	Mars_54019_Laboca.rcp	array_54019.pdf	beams_54019.pdf
54552	2007-12-24T03:32	Mars_54552_Laboca.rcp	array_54552.pdf	beams_54552.pdf
54993	2007-12-26T06:03	Mars_54993_Laboca.rcp	array_54993.pdf	beams_54993.pdf

Notes on individual channels

Channel #	Description
101, 103, 106, 110	Strong cross-talk: 101↔106 & 103↔110.
81-91, 92, 93-96, 135, 136, 142, 145, 150, 151, 157-160	Channels located in group 4 / cable M. All active channels pick up signal from channel 92 (cross-talk) in varying intensities, from few-percent level (#47507) to significant. Channel 92 is considered bad.
6, 179, 183, 184, 191, 192, 201, 205, 207, 217, 218, 220, 228, 309	Bad (noisy or insensitive) channels.
241	No proper signal. Picks up signal from channels 248 (strong) and 296 (weak).

channel_flags-2007-12.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
# 5 channels show strong cross-talk
cross = [ 101, 103, 106, 110, 241 ]
# Bad channels (no or very weak astronomical signal)
bad = [ 6, 92, 179, 183, 184, 191, 192, 201, 205, 207, 217, 218, 220, 228, 309 ]
# Remaining bolometers on cable M / group 4 (affected by cross-talk)
cable_M = [ 81, 82, 83, 84, 85, 86, 89, 90, 91, 93, 94, 96, 136, 159, 160 ]

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