Array parameters April 2009 (15/03-01/05)
During March 2009, LABOCA was removed from the C-cabin and the hexapod support
was improved with new leg joints. The support was also improved for the mirror
M6 in the C-cabin. After remounting, LABOCA was realigned and cooled down with
liquid Helium on March 9th to 11th, with observations starting on Marth 15th.
These mechanical changes required a complete new set of array parameters, which
were obtained by observations of several beam maps.
During this observing period, we found out that the pointing accuracy with LABOCA was still not perfect. Thus at the beginning of May the remaining LABOCA mirrors were also equipped with new hexapod joints, which again required new array parameters (2009-05).
Main parameter file: laboca-2009-04.rcp
Individual scans
Scan # | Date | Parameter file | Array plot | Individual channel maps |
---|---|---|---|---|
7762 | 2009-03-15T03:14 | Saturn_7762_Laboca.rcp | array_7762.pdf | beams_7762.pdf |
7790 | 2009-03-15T05:12 | Saturn_7790_Laboca.rcp | array_7790.pdf | beams_7790.pdf |
9033¹ | 2009-03-24T09:07 | Jupiter_9033_Laboca.rcp | array_9033.pdf | beams_9033.pdf |
12412¹ | 2009-04-05T09:44 | Jupiter_12408_Laboca.rcp | array_12408.pdf | beams_12408.pdf |
15009 | 2009-04-22T12:30 | Mars_15009_Laboca.rcp | array_15009.pdf | beams_15009.pdf |
15993 | 2009-04-24T23:51 | Saturn_15993_Laboca.rcp | array_15993.pdf | beams_15993.pdf |
17098 | 2009-04-27T23:42 | Saturn_17098_Laboca.rcp | array_117098.pdf | beams_17098.pdf |
Notes on individual channels
Channel # | Description |
---|---|
101, 103, 106, 110, 205, 218 | Strong cross-talk: 101↔106, 103↔110, and 205↔218. |
81-96, 135, 136, 142, 145, 150, 151, 157-160 | Channels located in group 4 / cable M. No signal and/or cross-talk (on a 20-30% level), depending on the date. We consider them bad. |
6, 160, 201 | Bad channels not showing any astronomical signal or very low signal levels. |
207, 228, 241 | No proper signal. Pick up signal from other channels at varying levels. |
179, 180, 183, 184, 185, 217, 220, 309 | Channels which are sometimes considered bad. Check your data. |
257 | Noisy, but will be weighted down during reduction. |
channel_flags-2009-04.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, 205, 218 ] # Bad channels (no/low signal) bad = [ 6, 160, 201, 207, 228, 241 ] # Remaining channels in group 4 / cable M: cable_M = [ 81, 82, 83, 84, 85, 86, 89, 90, 91, 92, 93, 94, 96, 136, 159 ] # Channels which are variable: bad_maybe = [ 179, 180, 183, 184, 185, 217, 220, 309 ] # Cable M channels are considered bad: bad = bad + cable_M