Bibcode
Reglero, V.; Rodrigo, J.; Velasco, T.; Gasent, J. L.; Chato, R.; Alamo, J.; Suso, J.; Blay, P.; Martínez, S.; Doñate, M.; Reina, M.; Sabau, D.; Ruiz-Urien, I.; Santos, I.; Zarauz, J.; Vázquez, J.
Referencia bibliográfica
In: Exploring the gamma-ray universe. Proceedings of the Fourth INTEGRAL Workshop, 4-8 September 2000, Alicante, Spain. Editor: B. Battrick, Scientific editors: A. Gimenez, V. Reglero & C. Winkler. ESA SP-459, Noordwijk: ESA Publications Division, ISBN 92-9092-677-5, 2001, p. 623 - 626
Fecha de publicación:
9
2001
Número de citas
2
Número de citas referidas
1
Descripción
The JEM-X Signal Multiplexing Systems are large HURA codes "written" in
a pure tungsten plate 0.5 mm thick. 24.247 hexagonal pixels (25% open)
are spread over a total area of 535 mm diameter. The tungsten plate is
embedded in a mechanical structure formed by a Ti ring, a pretensioning
system (Cu-Be) and an exoskeleton structure that provides the required
stiffness. The JEM-X masks differ from the SPI and IBIS masks on the
absence of a code support structure covering the mask assembly. Open
pixels are fully transparent to X-rays. The scope of this paper is to
report the optical performances of the FM JEM-X masks defined by
uncertainties on the pixel location (centroid) and size coming from the
manufacturing and assembly processes. Stability of the code elements
under thermoelastic deformations is also discussed. As a general
statement, JEM-X Mask optical properties are nearly one order of
magnitude better than specified in 1994 during the ESA instrument
selection.