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Submitted on 1 Jan 1979
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STREAK IMAGE CAMERA ”AGAT” WITH PICOSECOND TIME RESOLUTION USED FOR
INVESTIGATIONS IN PLASMA PHYSICS
V. Averin, O. Brekhov, B. Gorbenko, A. Klepov, G. Kolesov, L. Kondrashova, V. Lebedev, V. Miller, B. Stepanov
To cite this version:
V. Averin, O. Brekhov, B. Gorbenko, A. Klepov, G. Kolesov, et al.. STREAK IMAGE CAM- ERA ”AGAT” WITH PICOSECOND TIME RESOLUTION USED FOR INVESTIGATIONS IN PLASMA PHYSICS. Journal de Physique Colloques, 1979, 40 (C7), pp.C7-875-C7-876.
�10.1051/jphyscol:19797423�. �jpa-00219425�
JOURNAL DE PHYSIQUE CoZZoque C7, suppldment a u n 0 7 , Tome 40, J u X Z e t 1979, page C7- 875
STREAK IMAGE CAMERA"AGAT" WITH PICOSECOND TIME RESOLUTION USED FOR INVESTIGATIONS I N PLASMA PHYgCS
V.I. Averin, O.M. Brekhov, B.S. Gorbenko, A.F. Klepov, G.V. KoIesov, L.I. Kondrashova, V.V. Lebedev, V.A. Miller and B.M. Stepanov.
Coss ta n d a r d , U. S. 5'. R.
Time-analizing image converters PV-001 and PV-OOZR, developed by t h e All-Union S c i e n t i f i c Research I n s t i t u t e of Optical- Physical Measurements together with t h e Physical I n s t i t u t e of t h e Soviet Academy of Sciences, make it possible t o record t h e pulse s i g n a l s of r a d i a t i o n i n v i s i b l e and near-infrared region a s well a s i n s o f t X-ray one.
A d i s t i n g u i s h i n g f e a t u r e of the focu- s i n g systems of t h e both converters consis- t s i n t h e small spread of e l e c t r o n f l i g h t times from a photocathode t o t h e d e f l e c t i o n systems of an e l e c t r o n beam thanks t o high e l e c t r i c f i e l d i n t e n s i t y a t t h e photoca- thode which reaches 30 kV/cm.
The image converter PV-001 has a low r e s i s t a n c e oxygen-silver-cesium photocatho- de with s p e c t r a l s e n s i t i v i t y of 300 uA/W a t t h e wavelength 1,06 urn. An e l e c t r o n i c s h u t t e r i s arranged behind t h e anode i n t h e foxm of two paira; of d e f l e c t i o n p l a t e s
( s h u t t e r and compensating ones), t h e shut- t e r diaphragm is placed between them ( t h e cutoff v o l t a g e of an e l e c t r o n beam i s 400 V ). Then it i s followed by t h e wide- band d e f l e c t i o n system f o r image sweep on t h e screen. The s p a t i a l r e s o l u t i o n of %he
converter i s not l e s s t h a n 35
6 ' .
The image converter PV-002 R has a gold photocathode on a mica s u b s t r a t e , sen- s i t i v e over t h e s o f t X-ray region. Two mu- t u a l l y perpendicular d e f l e c t i o n systems, each of them i s analogous t o t h e d e f l e c t i o n system of t h e image converter PV-901, We arranged behind t h e anode.
The c a l c u l a t i o n of t h e electron-opti- c a l systems of PV-001 and PV-002R i s car- r i e d out; with consideration f o r a l l known f a c t o r s , which r e s t r i c t a l i m i t i n g time r e s o l u t i o n , i f t h e subpicoseconddtime re- s o l u t i o n i s ensured i n t h e PV-001 conver- t e r and t h e picosecond time r e s o l u t i o n en- sured i n t h e PV-002R converter.
The e l e c t r o s t a t i c converter PMU-I with a microchannel p l a t e (MIIKP) i s designed f o r t h e contact amplification of t h e image brightness a t t h e output of t h e time-ana- lyzing converters.
The diameters of t h e operating area of t h e photocathode .and anode a r e equal t o 40 mm, t h e electron-optical amplification i s I, t h e l i m i t i n g s p a t i a l r e s o l u t i o n i s 20 m-', t h e conversion c o e f f i c i e n t a t t h e wavelength 0,45 urn i s n o t l e s s than I O ~ W / W .
One of t h e above mentioned time-ana- lyzing converters connected with t h e PNN-I brightness a m p l i f i e r by f i b e r - o p t i c a l d i s k s
Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19797423
may be used i n a s t r e a k camera "Agat". than 25.
The image sweep a t t h e camera output The camera
"
Agat"
has been a l r e a u i s photographed on a standard high sensi- used when i n v e s t i g a t i n g d i f f e r e n t high- t i v e f i l m w i t h t h e width of 35 mm by means speed processes, such as picosecond p u l ~ e of a contact camera attachment. The m a x i - d u r a t i o n generation of s o l i d - s t a t e l a s e r s mum dimensions of t h e image on t h e f i l m a r e and dye-Sasers, focused l a s e r r a d i a t i o n I 0 x 40 mm a t t h e s p a t i a l r e s o l u t i o n up t o i n t e r a c t i o n with d i f f e r e n t media, develop- 20 mmol. To prevent t h e exposure of t h e ment of e l e c t r i c a l breakdown i n gas and f i l m by t h e background of t h e b r i g h t n e s s d i e l e c t r i c creeping discharge under t h e a m p l i f i e r , W i s supplied by p u l s e voltage, a c t i o n of high-voltage nanosecond pulses.A t customer-Is wish t h e camera may be 'Phe examples of recording high-speed a l s o complete with a s p e c i a l l y developed processes by means of t h e camera "Agatl' system f o r immediate v i s u a l i z a t i o n and di- a r e given i n Fig. 1-3.
-
S p e c t r a l s e n s i t i v i t y range (A):w i t h t h e image converter Fig. 1. Photochronogram of t h e i n t e r n a l s t r u c t u r e o f a g e n e r a t i o n s p i k e of
with t h e image converter a Ndrglass mode-locking l a s e r .
1,0;2,0;5,0 10,0;20,0;
50,0;100,0;
200,O;5C0,O3
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Limiting time resolution,...
PBeC 1
S e l f - d e l a y of s t a r t i n g ,
nsec
...
n o t more, Fig. 2. Microphotogram of W s p i k e s of a-
Additional delay of s t a r - t i n g c o n t r o l l e d everyo t h e r nanosecond
...
-
Power consumption of t h e camera 220 V , $0 Hz (VA),.
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Overall ~ m e n s i o n s , ram...t h a n 15 Ndrnlass l a s e r .
Fig. 3. Photochronographic r e c o r d i n g
-Mass, kg
