Supermirror hard-x-ray telescope.
The practical use of a grazing x-ray telescope is demonstrated for hard-x-ray imaging as hard as 40 keV by means of a depth-graded d-spacing multilayer, a so-called supermirror. Platinum-carbon multilayers of 26 layer pairs in three blocks with a different periodic length d of 3-5 nm were designed to enhance the reflectivity in the energy range from 24 to 36 keV at a grazing angle of 0.3 deg. The multilayers were deposited on thin-replica-foil mirrors by a magnetron dc sputtering system. The reflectivity was measured to be 25%-30% in this energy range; 20 mirror shells thus deposited were assembled into the tightly nested grazing-incidence telescope. The focused hard-x-ray image was observed with a newly developed position-sensitive CdZnTe solid-state detector. The angular resolution of this telescope was found to be 2.4 arc min in the half-power diameter.
Yamashita
K
K
Serlemitsos
P J
PJ
Tueller
J
J
Barthelmy
S D
SD
Bartlett
L M
LM
Chan
K W
KW
Furuzawa
A
A
Gehrels
N
N
Haga
K
K
Kunieda
H
H
Kurczynski
P
P
Lodha
G
G
Nakajo
N
N
Nakamura
N
N
Namba
Y
Y
Ogasaka
Y
Y
Okajima
T
T
Palmer
D
D
Parsons
A
A
Soong
Y
Y
Stahl
C M
CM
Takata
H
H
Tamura
K
K
Tawara
Y
Y
Teegarden
B J
BJ