MiniGRAIL progress report 2004

被引：15

作者：

de Waard, A

Benzaim, Y

Frossati, G

Gottardi, L

van der Mark, H

Flokstra, J

Podt, M

Bassan, M

Minenkov, Y

Moleti, A

Rocchi, A

Fafone, V

Pallottino, GV

机构：

[1] Leiden Univ, Kamerlingh Onnes Lab, LION Inst Phys, NL-2300 RA Leiden, Netherlands

[2] Twente Univ Technol, Low Temp Div, NL-7500 AE Enschede, Netherlands

[3] Univ Roma Tor Vergata, Dipartimento Fis, I-00173 Rome, Italy

[4] INFN Roma 2, Rome, Italy

[5] Natl Labs Frascati, Ist Nazl Fis Nucl, Frascati, Italy

[6] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[7] INFN Roma 1, Rome, Italy

来源：

CLASSICAL AND QUANTUM GRAVITY | 2005年 / 22卷 / 10期

关键词：

D O I：

10.1088/0264-9381/22/10/012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The 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 mu phi(0) Hz(-1/2). The detector was calibrated and the sensitivity curve of MiniGRAIL was determined.

引用

页码：S215 / S219

页数：5

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