A de Waard et al 2005 Class. Quantum Grav. 22 S215 doi:10.1088/0264-9381/22/10/012
MiniGRAIL progress report 2004
A de Waard1, Y Benzaim1, G Frossati1, L Gottardi1, H van der Mark1, J Flokstra2, M Podt2, M Bassan3, Y Minenkov3, A Moleti3, A Rocchi3, V Fafone4 and G V Pallottino5
Show affiliationsThe MiniGRAIL detector was improved. The sphere was replaced by a slightly larger one, having a diameter of 68 cm (instead of 65 cm), reducing the resonant frequency by about 200 Hz to around 2.9 kHz. The last four masses of the attenuation system were machined to increase their resonant frequency and improve the attenuation around the resonant frequency of the sphere. In the new sphere, six holes were machined on the TIGA positions for easy mounting of the transducers. During the last cryogenic run, two capacitive transducers and a calibrator were mounted on the sphere. The first transducer was coupled to a double-stage SQUID amplifier having a commercial quantum design SQUID as a first stage and a DROS as a second stage. The second transducer was read by a single-stage quantum design SQUID. During the cryogenic run, the sphere was cooled down to 4 K. The two-stage SQUID had a flux noise of about 1.6 μ
0 Hz−1/2. The detector was calibrated and the sensitivity curve of MiniGRAIL was determined.
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- MSC
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- Dates
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Issue 10 (21 May 2005)
Received 26 November 2004, in final form 19 January 2005
Published 21 April 2005
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MiniGRAIL progress report 2004
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Laser frequency noise suppression by arm-locking in LISA: progress towards a bench-top demonstration
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An optical readout system for the drag-free control of LISA
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