Observations on the Stanford 4800 KG gravity wave detector with a cosmic ray monitor

Details Observations on the Stanford 4800 KG gravity wave detector with a cosmic ray monitor Observations on the Stanford 4800 KG gravity wave detector with a cosmic ray monitor

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt.........6m&link_type=abstract

Ph.D. Thesis Stanford Univ., CA.

Statistics

Cosmic Rays, Cryogenic Equipment, Detection, Gravitational Waves, Scintillation Counters, Cosmic Ray Showers, Noise Temperature

Scientific paper

The group at Stanford University has constructed a 4800 kg cryogenic detector which is the most sensitive detector for gravitational radiation successfully operated to date. In this dissertation data are presented from the 1985 run of 36.8 days aggregate collection time. Over the full bandwidth of approximately 13 Hz, the optimum detector noise temperature was found to be 8 mK when the system was operated at 4.3 K. An actual filter was implemented over a 5 Hz bandwidth which yielded the filtered noise temperature of 15 mK. Filtering over the entire bandwidth and operation of a dilution refrigerator at 1 K should lower the noise temperature to below 3 mK. The rate of events whose signal temperature exceeded 0.6 K was found to be higher than that for a similar run in 1981, partly due to greater general activity in the laboratory. A preliminary coincidence experiment was conducted between the Stanford detector and a room temperature detector in Guangzhou, China. In a total of 9.38 days of simultaneous data collection the number of coincidences observed was entirely consistent with random statistics. In the second half of this dissertation, the effect of cosmic rays on a gravity wave bar detector is considered. A one-dimensional thermoacoustic model is used to predict the size of the signal. Measurable effects are restricted to rarer events which may easily be vetoed as gravity wave candidates.

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