Effect of a magnetic field generated by permanent magnets on the GPD polarization sensitivity

Paolo Soffitta; Enrico Costa; Alfredo Morbidini; Fabio Muleri; Alda Rubini; Daniele Spiga; Ronaldo Bellazzini; Alessandro Brez; Luca de Ruvo; Massimo Minuti; Michele Pinchera; Gloria Spandre

doi:10.1117/12.2069867

24 July 2014 Effect of a magnetic field generated by permanent magnets on the GPD polarization sensitivity

Paolo Soffitta, Enrico Costa, Alfredo Morbidini, Fabio Muleri, Alda Rubini, Daniele Spiga, Ronaldo Bellazzini, Alessandro Brez, Luca de Ruvo, Massimo Minuti, Michele Pinchera, Gloria Spandre

Author Affiliations +

Proceedings Volume 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray; 91444P (2014) https://doi.org/10.1117/12.2069867
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

The Gas Pixel Detector (GPD) is an imaging X-ray polarimeter with a moderate spectral resolution and a very good position resolution.^{1, 2} The GPD derives this information from the true 2-d charge image of the photoelectron track produced in gas and collected by an ASIC CMOS chip after its drift and its multiplication. In this paper we report on the experimental results of the study of the effect of a strong magnetic field in reducing the diffusion and increasing the sensitivity for a GPD filled with one bar of He-DME 20-80. We generated a magnetic field of about 1600 Gauss by means of commercial magnets made of an alloy of Neodymium-Iron-Boron configured as one ring and one cylinder. We compared the pixel size distributions and the modulation curves with and without magnets at two different drift fields, corresponding to different nominal diffusion properties, with both polarized and unpolarized sources. The results obtained show that a not sensitive improvement is present at this fields implying that a much larger magnetic field is necessary with this mixture, albeit a shift on the position angle of the modulation curve, derived from a polarized source, is observed.

Citation Download Citation

Paolo Soffitta, Enrico Costa, Alfredo Morbidini, Fabio Muleri, Alda Rubini, Daniele Spiga, Ronaldo Bellazzini, Alessandro Brez, Luca de Ruvo, Massimo Minuti, Michele Pinchera, and Gloria Spandre "Effect of a magnetic field generated by permanent magnets on the GPD polarization sensitivity", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91444P (24 July 2014); https://doi.org/10.1117/12.2069867

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
9 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Magnetism

Diffusion

Modulation

X-rays

Electrons

Sensors

Titanium

Show All Keywords

Keywords/Phrases

Search In:

Publication Years