Array parameters April 2008 (09/04-04/05)

After the modifications and tests made in February 2008, LABOCA was let warm up. It was cooled down again on 8th April, and stayed cold until we discovered sensitivity problems in the beginning of May.

Main parameter file: laboca-2008-04.rcp

Individual scans

Scan #	Date	Parameter file	Array plot	Individual channel maps
9281	2008-04-18T00:05	Mars_9281_Laboca.rcp	array_9281.pdf	beams_9281.pdf
9555	2008-04-18T23:27	Mars_9555_Laboca.rcp	array_9555.pdf	beams_9555.pdf
10406	2008-04-21T23:52	Mars_10406_Laboca.rcp	array_10406.pdf	beams_10406.pdf
12887	2008-05-02T23:15	Mars_12887_Laboca.rcp	array_12887.pdf	beams_12887.pdf

Notes on individual channels

Channel #	Description
101, 103, 106, 110	Strong cross-talk: 101↔106 & 103↔110.
81, 82, 83, 84-91, 92, 93-96, 135, 136, 142, 145, 150, 151, 157-160	Channels located in group 4 / cable M. 82, 83, 85, 86, and 92 are considered bad, the other active channels pick up signal from channel 92 (cross-talk).
6, 179, 184, 201, 205, 207, 218, 228, 309	Bad (noisy or insensitive) channels.
167, 191, 192	Channels that are bad in some of the maps, but not all.
241	No proper signal. Picks up signal from channels 248 (strong) and 296 (weak).

channel_flags-2008-04.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
# 5 channels show strong cross-talk
cross = [ 101, 103, 106, 110, 241 ]
# Bad channels (no or very weak astronomical signal)
bad = [ 6, 82, 83, 85, 86, 92, 179, 184, 201, 205, 207, 218, 228, 309 ]
# Variable channels (sometimes bad, sometimes not)
bad_maybe = [ 167, 191, 192 ]
# Remaining bolometers on cable M / group 4 (affected by cross-talk)
cable_M = [ 81, 84, 89, 90, 91, 93, 94, 96, 136, 159, 160 ]

	Atacama Pathfinder EXperiment APEX OLD pages, check new site LABOCA Calibration
		APEX TWIKI CONTACT SEARCH HELP NEWS DISCLAIMER