Array parameters September 2013
(12/09-24/11)
LABOCA was cooled down again on September 11th, and has been used more or less continuously afterwards until the end of the Swedish time block on 24th of November. It was then warmed up for the summer shutdown and will be available again in March 2014.
Main parameter file: laboca-2013-09.rcp
Individual scans
¹ These scans are not considered for the averaged parameter
file because of their relatively low S/N.
² This scan is not considered for the averaged parameter file because LABOCA warmed up before the map was finished.
² This scan is not considered for the averaged parameter file because LABOCA warmed up before the map was finished.
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.
Compared to earlier this year, channel 257 is now consistently bad. Also, channel 170 seems to be unusable after about mid-September.
| 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, 257, 309 | Bad channels, not showing any astronomical signal or very low signal levels, unconnected to groups 4 or 7 above. |
| 65, 77, 170 | Variable channels. While 65 and 77 are usually usable, 170 is considered bad after mid-September. |
channel_flags-2013-09.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, 133, 136, 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, 257, 309 ]
![[Home]](https://www.apex-telescope.org/images/icon-home.gif "APEX Telescope Home Page"){kind=icon}