NDLI: The data acquisition of the Micromegas detector for the CAST experiment

Content Provider	IEEE Xplore Digital Library
Author	Geralis, T. Fanourakis, G. Giomataris, Y. Zachariadou, K.
Copyright Year	2004
Description	Author affiliation: NCSR Demokritos, Inst. of Nucl. Phys., Attiki, Greece (Geralis, T.; Fanourakis, G.)
Abstract	The Micromegas (/spl mu/M) detector is one of the three types of detectors (CCD, /spl mu/M and TPC) that are used for solar axion detection at the CAST experiment. The /spl mu/M detector is sensitive to X-rays, originating from a conversion of axion to photon in a strong magnetic field (9T), in the range of a few hundred eV to 10 keV. Good detection efficiency, energy resolution, spatial resolution and extremely low background are the characteristics of this type of detector. The Data Acquisition of the Micromegas detector is presented here. The Front End cards are using multiplexed analog integrated circuits. A set of VME modules performs the readout that is expandable to read up to 2 /spl times/ 19 /spl times/ 2048 (77824) channels. The system has the capability to apply online, per individual channel, a threshold and a subsequent pedestal subtraction. At the CAST experiment rates the dead time is negligible. A PCI-MXI2-VME interface is used to read out the data to a PC, to perform monitoring and to Display Events. The system is based on the National Instruments' LabView software and is running both in Windows 2000 and Linux operating systems. The data are automatically archived on storage media at the central CERN computing facilities and the PC clock is synchronized periodically with the GPS time using the CERN time servers. This allows the precise event time stamping for the possibility to correlate them to astrophysical phenomena. The precision of the clock update is of the order of 50 /spl mu/s. The same system has been used for Medical Imaging R&D programs and Dark Matter searches.
Starting Page	3455
Ending Page	3459
File Size	992430
Page Count	5
File Format	PDF
ISBN	0780382579
ISSN	10823654
DOI	10.1109/NSSMIC.2003.1352656
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-10-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Data acquisition Clocks Charge coupled devices X-ray detection X-ray detectors Magnetic fields Energy resolution Spatial resolution Analog integrated circuits Monitoring
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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