New hard x-ray/gamma-ray telescope Welcome-1

Tadayuki Takahashi; Shuichi Gunji; Masaharu Hirayama; Tuneyoshi Kamae; S. Miyazaki; Yutaro Sekimoto; Masaaki Tanaka; Takayuki Tamura; Noriko Y. Yamasaki; Takamasa Yamagami; Masaharu Nomachi; Heihachiro Murakami

doi:10.1117/12.138605

22 December 1992 New hard X-ray/gamma-ray telescope - Welcome-1

Tadayuki Takahashi, Shuichi Gunji, Masaharu Hirayama, Tuneyoshi Kamae, S. Miyazaki, Yutaro Sekimoto, Masaaki Tanaka, Takayuki Tamura, Noriko Y. Yamasaki, Takamasa Yamagami, Masaharu Nomachi, Heihachiro Murakami

Author Affiliations +

Proceedings Volume 1734, Gamma-Ray Detectors; (1992) https://doi.org/10.1117/12.138605
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

We have developed a low background hard X-ray/gamma-ray telescope for balloon-borne experiments. The telescope called Welcome-1 (Well type Compound Eye) utilizes newly developed well-type phoswich counters. In the well-type phoswich counter, the background from external and internal sources are reduced significantly, Welcome-1 is designed for observation in the energy range from 60 keV to 800-1000 keV. The effective area of Welcome-1 is 740 sq cm at 122 keV and 222 sq cm at 511 keV line. We flew Welcome-1 in 1990 and 1991 to detect hard X-rays from SN1987A, PSR1509-58, Cen-A and others. The background levels at an altitude of 4g/sq cm are 1 x 10 exp -4/sq cm photons/s/keV at 122 keV and 3 x 10 exp -5 photons/sq cm/s/keV at 511 keV. The data obtained during the flight shows that the detector in fact has the 3 sigma sensitivity of about a few x 10 exp -6 photons/sq cm/s/keV and about 10 exp -4 photons/sq cm/s in a 10 exp 4 s observation for the continuum spectrum and line spectrum, respectively.

Citation Download Citation

Tadayuki Takahashi, Shuichi Gunji, Masaharu Hirayama, Tuneyoshi Kamae, S. Miyazaki, Yutaro Sekimoto, Masaaki Tanaka, Takayuki Tamura, Noriko Y. Yamasaki, Takamasa Yamagami, Masaharu Nomachi, and Heihachiro Murakami "New hard X-ray/gamma-ray telescope - Welcome-1", Proc. SPIE 1734, Gamma-Ray Detectors, (22 December 1992); https://doi.org/10.1117/12.138605

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