HAL Id: jpa-00227582
https://hal.archives-ouvertes.fr/jpa-00227582
Submitted on 1 Jan 1988
HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.
L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
XUV STIGMATIC POLYCHROMATORS
M. Pouey
To cite this version:
M. Pouey. XUV STIGMATIC POLYCHROMATORS. Journal de Physique Colloques, 1988, 49 (C1), pp.C1-323-C1-323. �10.1051/jphyscol:1988168�. �jpa-00227582�
JOURNAL DE PHYSIQUE
Colloque C1, Suppl6ment au n03, Tome 49, Mars 1988
XUV STIGMATIC POLYCHROMATORS
M. POUEY
L a b o r a t o i r e d e Physique Gaz e t Plasmas ( C N R S LA-400731, U n i v e r s i t e P a r i s X I , Bat, 2 1 2 , F-91405 Orsay Cedex, France
I n t h i s paper u e d e s c r i b e n e u S T I G H A T I C X U V P O L Y C H R O H A T O R S spe- c i a l l y designed for hot p l a s m a s diagnostics.Fixed horizontal a n d verti- cal diffracted beam divergences,as well a s E R E C T E D F L A T F I E L O are allo- w e d tmorehouer s o l u t i o n s o c c u r f a r v a r i o u s g r o o v e s density.
I n 'GRAZING I N C I D E N C E U L T I H A T E S POLYCHROHATORS'(UGP),the focusing i s a c h i e v e d by a s t i g m a t i c t o r o i d a l mirror (unit magnification),and t h e d i s p e r s i o n of t h e r a d i a t i o n , by a s i m p l e r o t a t i o n o f a plane t y p e V holographic grating W O R K I N G A T M I N U S O N E MAGNIFICATION.If t h e point s o u r c e s used to record t h e h o l o g r a m a r e l o c a t e d a t t h e s a m e distance f r o m t h e grating pole STIGflATIC images a r e l o c a t e d o n a c i r c l e centered o n t h e grating pole.Erected F L A T F I E L D may be t h e n c o n s i d e r e d in s o f a r a s t h e corresponding b r o a d e n i n g of t h e line s p r e a d f u n c t i o n I s less t h a t h e pixel size.
H o r e h o w e r F O R S U C H D E V I C E S A N D S U C H T Y P E O F H O L O G R A P H I C G R A T I N G A L T H E A B E R R A T I O N S A R E P R O P O R T I O N N A L T O m N .The s a m e property is obtain f o r t h e L I N E S P R E A D F U N C T I O N d e r i v e d f r o m t h e t r a n s v e r s e ray a b e r r a t i o n f u n c t i o n s evaluated F O R A P U P I L C O O D I N A T E S Y S T E n P E R P E N D I C U L A R T O T H E P R X N C I P A L RAY( T O E N S U R E T H A T T H E C O R R E C T S L O P E S OF T H E WAVE-FRONT A R E F O U N D )
.
A s example,ue d e s c r i b e in d e t a i l s e t h e d e s i g n a n d t h e performances o f a n UGP-80-100 model(i=80o,d=lm, n=7001/mm) u o r k i n g in m i n u s orders.
F o r a 5 0 m m wide detector (height 2.5mm,pixel s i z e 1 0 0 u m ) t h e f r e e spec- tral r a n g e decreases f r o m l l n m at 12.5nm t o 5 n m a t 60nm.Practical
practica1,between 5 a n d 6 5 n m . i ~ better t h a n 0.02nm. f o r optimal slit s i z e decreasing, v s t h e u a v e l e * n g t h , f r o m 6 2 u m t o 3 2 u m (slit height 2.5n t h i n c e t h e device u o r k s at o n e t o o n e magnification).FWHH of t h e L i n e s p r e a d f u n c t i o n derived f r o m exact R A Y T R A C E P R O F I L E uill be compared t o corresponding v a l u e d e r i v e d f r o m G E O H E T R I C A L O P T I C A L CRITERION.
Finally,the actual s t a t u s o f a prototype uill be described.
Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1988168
