FLASH+ Efficiency Measurements
|
Date |
Source |
Θd["] |
ηf (λ) |
ν[GHz] |
Θmb["] |
ηs(λ) |
Notes |
|
Observing Campaign: 2012 (after receiver upgrade) |
|||||||
|
21.06.2012 |
Mars |
6.95 |
0.95 |
350 |
17.6 |
0.69 |
|
|
0.95 |
462 |
13.2 |
0.60 |
||||
|
Observing Campaign: 2013 |
|||||||
| 30.11.2013 | Jupiter | 44.8 | 0.95 | 349 | 17.6 | 0.67 | |
| 0.95 | 466 | 13.2 | 0.58 | ||||
| 04.10.2013 | Mars | 4.40 | 0.95 | 349 | 17.6 | 0.65 | calibrating with 15 dB SB rejection |
| 0.95 | 458 | 13.3 | 0.56 | ||||
|
Observing Campaign: 2014 |
|||||||
| 14.05.2014 | Mars | 13.47 | 0.95 | 349.6 | 17.5 | 0.69 | |
| 0.95 | 403.9 | 15.1 | 0.63 | ||||
| 15.07.2014 | Mars | 8.67 | 0.95 | 273 | 22.3 | 0.72 | |
| 25.08.2014 | Mars | 7.02 | 0.95 | 309 | 19.7 | 0.69 | |
Notes on the calibration of FLASH+ data:
- The pointing and focus measurements during the commissioning confirmed that the optics of the FLASH+ performs as designed. The beams are diffraction limited (scale with frequency according to ΘFWHP ≈ 1.2 λ/D).
- The two channels are co-aligned on sky to better than 0.5''; the radial focus positions are determined to be nearly identical.
- The forward efficiency ηf (λ) is best estimated to 0.95 (± 0.02). This is default for the APEX online calibrator.
- The coupling efficiency to a given source (with diameter Θd["]) is described by ηs(λ) (recall that the coupling depends on source size).
- Both FLASH+ detectors operate with high image gain suppressions. Default for the APEX online calibrator is 15 dB as of 01.09.2013.