NDLI: A hard X-ray imaging polarimeter for balloon-borne astronomy

Content Provider	IEEE Xplore Digital Library
Author	Austin, R.A. Minamitani, T. Ramsey, B.D.
Copyright Year	1996
Description	Author affiliation: Space Sci. Lab., NASA Marshall Space Flight Center, Huntsville, AL, USA (Austin, R.A.; Minamitani, T.; Ramsey, B.D.)
Abstract	A polarimeter based upon an optical avalanche chamber is being developed at the Marshall Space Flight Center. The polarimeter will be carried aloft by balloon for imaged polarization measurements of celestial sources at energies between 40 keV and 100 keV. In the lab, using a small prototype polarimeter, we have measured a modulation factor of 0.3 at 54 keV. The polarimeter works by using a CCD camera to image the track of each photoelectron liberated when an X-ray is absorbed in the optical avalanche chamber. By virtue of this technique, we are able to measure the ejection direction of the photoelectrons (i.e. polarization of the incident X-ray beam) as well as locate the position of the absorbed X-ray to within a region smaller than the size of the charge cloud. As a result, we can obtain a map detailing the two dimensional distribution of polarization amplitude and polarization direction. We present details of this work as well as a description of the balloon experiment we are currently building.
Starting Page	131
Ending Page	135
File Size	675254
Page Count	5
File Format	PDF
ISBN	078033180X
DOI	10.1109/NSSMIC.1995.504193
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-10-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	X-ray imaging Astronomy Extraterrestrial measurements Optical modulation Optical polarization Energy measurement Prototypes Charge coupled devices Charge-coupled image sensors Current measurement
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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