MICROCALORIMETERS FOR X-RAY SPECTROSCOPY

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Submitted on 1 Jan 1988

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MICROCALORIMETERS FOR X-RAY SPECTROSCOPY

E. Silver, C. Hailey, S. Labov, N. Madden, D. Landis, F. Goulding, B.

Chanan, J. Rutledge, G. Bernstein, P. Richards, et al.

To cite this version:

E. Silver, C. Hailey, S. Labov, N. Madden, D. Landis, et al.. MICROCALORIMETERS FOR X-RAY SPECTROSCOPY. Journal de Physique Colloques, 1988, 49 (C1), pp.C1-41-C1-41.

�10.1051/jphyscol:1988105�. �jpa-00227425�

JOURNAL DE PHYSIQUE

C o l l o q u e C l , S u p p l 6 m e n t au n 0 3 , Tome 4 9 , Mars 1 9 8 8

E . SILVER, C. HAILEY, S . LABOV, N. MADDEN*, D. LANDIS*, F. GOULDING*

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P. RICHARDS* *

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Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.

* ~ a w r e n c e Berkeley Laboratory, Berkeley, CA 94720, U.S.A.

* * University of California at Irvine, U.S.A.

***university of California at Berkeley, Berkeley, CA 94720, U. S.A.

* * * X

University of California at Davis, U.S.A.

The m e r i t s of microcalorimetry below 1 ° K f o r high r e s o l u t i o n spectroscopy has become widely recognized on t h e o r e t i c a l grounds. By combining t h e high e f f i c i e n c y , broadband s p e c t r a l s e n s i t i v i t y of t r a d i t i o n a l p h o t o e l e c t r i c d e t e c t o r s with t h e high r e s o l u t i o n c a p a b i l i t i e s c h a r a c t e r i s t i c of d i s p e r s i v e spectrometers, t h e microcalorimeter could p o t e n t i a l l y r e v o l u t i o n i z e spectroscopic measurements o f a s t r o p h y s i c a l and l a b o r a t o r y plasmas, I n a c t u a l i t y , however, t h e performance of prototype instruments has f a l l e n s h o r t of t h e o r e t i c a l p r e d i c t i o n s and p r a c t i c a l d e t e c t o r s a r e s t i l l unavailable f o r use a s l a b o r a t o r y and space-based instruments. These i s s u e s a r e c u r r e n t l y being addressed by t h e new c o l l a b o r a t i v e i n i t i a t i v e between LLNL, LBL, U . C . I . , U.C.B., and U.C.D..

Microcalorimeters of various types a r e being developed and t e s t e d a t temperatures of 1 . 4 , 0.3, and 0.l0K. These include monolithic devices made from NTD Germanium and composite c o n f i g u r a t i o n s u s i n g sapphire s u b s t r a t e s with temperature s e n s o r s f a b r i c a t e d from NTD Germanium, evaporative f i l m s of Germanium-Gold a l l o y , o r m a t e r i a l with superconducting t r a n s i t i o n edges. A new approache t o low n o i s e p u l s e counting e l e c t r o n i c s has been developed t h a t allows t h e u l t i m a t e speed of t h e device t o be determined s o l e l y by t h e d e t e c t o r thermal response and geometry. Our l a b o r a t o r y s t u d i e s of t h e thermal and r e s i s t i v e p r o p e r t i e s of t h e s e and o t h e r candidate m a t e r i a l s should enable u s t o c h a r a c t e r i z e t h e p u l s e shape and subsequently p r e d i c t t h e u l t i m a t e performance. We a r e b u i l d i n g a compact a d i a b a t i c demagnetization r e f r i g e r a t o r f o r conveniently reaching 0.1"K i n t h e l a b o r a t o r y and f o r use i n f u t u r e s a t e l l i t e - b o r n e missions. A d e s c r i p t i o n of t h i s instrument t o g e t h e r with r e s u l t s from our most r e c e n t experiments w i l l be presented.

(''work performed under the auspices of the US Department of Energy by the Lawrence Livermore Laboratory under contract number W-7405-ENG-48, U.S.A.

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1988105