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Interferometer_sensitivity_studies (General)
swinkels - 22:47 Wednesday 02 April 2008 (20254) Print this report
Some more magnetic injections
This afternoon, I repeated yesterday's measurement (see #20239) in the central building to check for repeatability. In this case, the coil was placed on the lower balcony in the north east corner (above the L-room). In theory, this measurement should be more or less independent of the place of the source.

Injections times: [f, gps_start, gps_stop]: [5 891181188 891181383; 7 891181402 891181484; 11 891181503 891181624; 15 891181640 891181761; 21 891181778 891181902; 33 891181921 891182106; 44 891182123 891182363; 57 891182379 891182647; 69 891182662 891183026; 87 891183048 891183531; 103 891183560 891184172]

Later in the evening, I did a similar measurement in the detection lab to check for any magnetic pick-up in the analog electronics. I was able to inject lines up to at least 800 Hz, but this required putting the coil right next to the rack, which is a good sign. To still get a sort of far-field measurement, I moved the coil as far away as possible while still being able to observe the lines. The final location was about 2 meter from the demodulation rack and about 1 meter from the ADC rack. The magnetometer MABDCE02 was placed in the mirror position. It might be possible that you are at the same time moving the NI mirror, but since this coupling should fall off with f^2, any remaining coupling at high frequencies should be due to the electronics.

Injection times: [57 891196702 891196769; 69 891196792 891196873
87 891196893 891196993; 103 891197014 891197115; 132 891197134 891197275; 153 891197513 891197638; 171 891197298 891197479; 203 891197659 891197901; 227 891197919 891198303; 253 891198330 891198633; 317 891198653 891199013; 397 891199039 891199433]; quiet = [891199451 891199701]
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