PhUdn'.; p-iap buc b a y chiim tia dien tii co cac u u d i e m s a u : Moi t r u d n g che tao m a u sach nl-.d co ci:an k h o n g cao; Do t i n h k h i c t cua m a n g so vdi v a i h e u gdc dude d a m bao do cac
!)h;ui ;.d g a n nr,ú h:\y h(ii tiic tlidi dúdi lac d i m g n h i e t cua clium tia dien tU; Bdc bay duOc i:au het cac loai v a i lu;u vi c h u m tia ị\\cn td hoi tu co n a n g l u o n g r a i Idn: Do dieu c h i n h (xp s u a i va Llian;i i-.h.an kJu va n h i e t do, c u n g n h u de t h e o doi q u a Lrinh l.ing dong; Co t h e sd d u n g r a t it v:}i h e u gdc (dUdi 100 mg) de bdc b a y . cho nen t r o n g cac trvfdng hdp tien h a n h
Linii kien qiKinti tlicn lír livn ca sd.
n h i e u thiic n g h i e m de tim kiem cdng n g h e che tao v a t lieu mdi sc t i e t k i e m d a n g ke n g u y e n v a t lieu q u y h i e m .
Dac d i e m noi b a t ciia i)hudng i)hap chiim tia dien t d k h a c vdi cac phUOng p h a p hoc bay n h i e t h a y p h u n xa catdt la n a n g lUdng ciia c h u m dien td dUdc hoi tu trUc t i e p t r e n v a i lieụ K h i c h u m tia dien td n a n g lUdng cao bdn p h a v a t lieu thi t o a n bo dong n a n g cua cac dien tU di(dc c h u y e n t h a n h n h i e t n a n g do hi d d n g dot ngot. N g u y e n 15' b o a t d o n g c u a s u n g dien t d t r o n g c h a n k h o n g h o a n t o a n giong nhU mot d e n dien lu ba cUc ftriot): catdt la sdi volfram cd dien ap cao tdi 10 kV, dien a p t r e n dien cue kfdi dUOc dieu k h i e n cd do c h e n h dien ap cjin t h i e t so vdi catdt va a n d t tlnfdng hi loan bo c h u o n g t h e p k h o n g rị K h a c vdi t r i d t la t r o n g t h i e t hi c h a n k h d n g cdn c-d n a m c h a m tlien vdi t d trifdng cd h u d n g s o n g s o n g vdi soi catdt (vuong gdc vdi húdng bay r a cua dien t d ) . dieu kliien do Idn c d a i d trUdng se chinli dúdc k h o a n g each hoi t u cda c h u m dien td.
Q u y dao b a y cua dien td chíOc q u y e t d i n h bdi hai >'eu to q u a n t r o n g la v a n td.c b a n diiu
t h o a t r a khdi catdt va tld Idn cda lii t r u d n g . ihoo d i n h l u a t L o r e n t z :
F = -qv xB (l)
Khi n g u o n t)hat xa boat dong t a i m d c bao hoa thi đng catot cue dai dUde dieu khiet
h d n g viec hiọ chon d d n g đt. Dudi m d c bao hod, m a t do dong jdiu iliudc vao t h e gia Idc
Dong n a n g b a n đu c u a el ec t ro n p h a t xa la 3kT/2, k h d n g d a n g ke so vdi d o n g n a n g cud
c u n g c h u n g d a t dviac s a u khi dude gia tdc t r o n g d i e n trUdng mdt c h i e u dien ap cao (td 7 dei
10 kV).
C h u m tia (hen td b;in ra tu s d n g d i e n td dúoc dieu k h i e n va hrn tu vao c h e n d u n g va h e u goc. C h u m tia dien td dUdc gia toe t r o n g d i e n trUiing co n a n g ludng cao va boi lu va
chen n a y n h d t a c d u n g c d a t d trúdng dieu k h i c n . K h i c h u n g d d n g đt n-o. raing l u d n g cọ
dien td t r u y e n h e t cho v a i Heu goc. nhd đ m a v a t lieu hoa hdi roi l a n g dong len dẹ Do va\ d u n g phU((ng phai) ^'"^'^' hay c h u m tia dien tu cd t h e che tao m a n g m d n g co do t i n h k h i e t caọ He c h a n k h d n g cd c h u m tia dien t d Y B H - P M dUdc sd d u n g gdm c h u o n g t h e n k h d n gi, bdm cd lioc va bdm k h u y e c h t a n duoc dieu k h i c n nhd cac van chu Irinb.. a p s u a t tron
b u d n g boc bay d.i(^c k h d n g che c h i n h xac de tao r a hrdng dxy can i h i e t cho q u a t r i n h bdc ba p h a n d n g . N g u d n n a n g hfdng thing de kich t h i c h cde piian td bay hdi la c h u m tia d i e n tu >.
n a n g hi\ing cao duoc hoi lu t r e n bia v a t lieụ D d n g n a n g cua dien id cd t h e d a t 10 keV lu thuoc vao llie gia tdc. C h d m tia cd kich thifdc tieu diem vao cd L n n r ' . Khi hdi lu \-ao ngur v a t lieu, nd tao ntMi mot v u n g n h i e t do r a t cao lam cho cdc p h a n td cda v a i h e u i h a n g IK bay ldi tie tao t h a n h m a n g m o n g
M a n g m d n g dxvt v a n a d i dude l a n g d o n g t r e n de t h u y i i n h . vht heu gor d u n g de b^ bay la hot oxyt v a n a d i V,,0:, hoac V O . h a y h d n hop V , 0 , - V . O - , ep i h a n h viOn (difdng k i n h
lOmm; do d a y = S m m ) . V a t h e u ^j.6c n a y d.Mc d a i vao c h e n t r o n g budnt: c h a n k h d n g . a o .^u ed t h e d a t lii 10"' den 10*'Torr. K h o a n g each tu c h e n dén de la 2d cm. .Xhiel do de diMc g
CO d i n h tai 200"C. Ddng catot t d S d e n 10 A: D d n g tai (and't) d a t lu -K) đn 80 niẠ Thdi gi;
10 NeuvCn Nfin" Oinh
Dudi che do boc bay chum tia dien tii nhii tren, mang nhan dUdc thUdng la vo dinh
hinh. Viec tao ra cau true nano dadc thiic hien b^ng qua trinh tai ket tinh trong moi trUdng oxy dp suat thap va che do gia nhiet thich hdp.