Array parameters November 2007 (18/10-15/11)
Around mid-October, a special mounting structure for CHAMP+ tests and the
holography receiver was installed in the Cassegrain cabin.
By mid-november, we discovered that this structure
was shadowing a significant fraction (32 channels) on the eastern edge of
LABOCA's field of view. The structure was removed on November 15th in the
afternoon.
No manual work was done on LABOCA itself, thus we don't expect
the channel parameters to have changed afterwards, except probably some
channels at the eastern edge, close to the shadowed area.
Main parameter file: laboca-2007-11.rcp
Individual scans
Scan # | Date | Parameter file | Array plot | Individual channel maps |
---|---|---|---|---|
46274 | 2007-11-10T08:46 | Mars_46274_Laboca.rcp | array_46274.pdf | beams_46274.pdf |
47083 | 2007-11-14T09:12 | Mars_47083_Laboca.rcp | array_47083.pdf | beams_47083.pdf |
47307 | 2007-11-15T09:13 | Mars_47307_Laboca.rcp | array_47307.pdf | beams_47307.pdf |
Notes on individual channels
Channel # | Description |
---|---|
101, 103, 106, 110 | Strong cross-talk: 101↔106 & 103↔110. |
241 | No proper signal. Picks up signal from channels 248 (strong) and 296 (weak). |
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 (which is considered bad). This causes very light cross-talk, probably insignificant for data reduction. |
6, 179, 184, 191, 192, 201, 205, 207, 217, 218, 220, 228, 309 | Bad (noisy or insensitive) channels. |
18, 28, 171, 172, 174, 177, 180, 185, 196, 213, 219, 221, 225, 227, 232, 248, 252, 254, 256, 259, 265, 273, 275, 278, 280, 283, 294, 299, 305, 314, 316, 320 | 32 channels shadowed by a mounting structure in the C-cabin. |
channel_flags-2007-11.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, 184, 191, 192, 201, 205, 207, 217, 218, 220, 228, 309 ] # Remaining bolometers on cable M / group 4 cable_M = [ 81, 82, 83, 84, 85, 86, 89, 90, 91, 93, 94, 96, 136, 159, 160 ] # Channels shadowed by the mounting structure in the C-cabin shadowed = [ 18, 28, 171, 172, 174, 177, 180, 185, 196, 213, 219, 221, 225, 227, 232, 248, 252, 254, 256, 259, 265, 273, 275, 278, 280, 283, 294, 299, 305, 314, 316, 320 ]