INTELLIGENT TRIGGER PROCESSOR FOR THE CRYSTAL BOX by ...
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INTELLIGENT TRIGGER PROCESSOR FOR THE CRYSTAL BOX by ...
A 1 arge solid angle modul ar Nal (J i) detector with 432 phototubes and 88 trigger scintillators is being used to search simultaneously for three lepton flavor ...
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I N T E L L I G E N T TRIGGER
PROCESSOR
FOR THE C R Y S T A L
BOX
by G.H.
S a n d e r s , H . S . B u t l e r , M . D . C o o p e r , G.W. H a r t , C M . H o f f m a n , G . E . Hogan, H.S. M a t i s , V . D . Sandberg, R.A. W i l l i a m s L o s A l a m o s N a t i o n a l L a b o r a t o r y , L o s A l a m o s , NM 87545 E . B . H u g h e s , J . R o l f e , S . W i l s o n , H. Zeman H i g h E n e r g y P h y s i c s L a b o r a t o r y and D e p a r t m e n t o f P h y s i c s , S t a n f o r d U n i v e r s i t y , S t a n f o r d , CA 94305 ABSTRACT
A 1 a r g e s o l i d a n g l e modul a r N a l (J i) d e t e c t o r with 432 phototubes and 8 8 trigger scintillators is being used to search simultaneously for three lepton flavor changing d e c a y s o f t h e muon. A beam o f up t o 1 0 m u o n s s t o p p i n g p e r s e c o n d w i t h a 6 % duty factor would yield up t o 1 0 0 0 t r i g g e r s p e r s e c o n d f r o m r a n d o m t r i p l e c o i n c i d e n c e s . A reduction o f t h e t r i g g e r r a t e t o 1 0 Hz i s required from a hardwired primary trigger processor d e s c r i b e d i n t h i s paper. F u r t h e r r e d u c t i o n t o 6 5
TO M A S T E R
>
9 0 MeV"
>
120
MeV
Logic used t o compose t h e primary master reactions.
trigger
MeV*
for
the
u -«• ey
and
y. + eyy
- 228 -
I MASTER
TRIGGER
INTEGRATE a HOLD
TIME a AMPLITUDE SIGNALS E
TIME TO AMPLITUDE CONVERTER
108 C H A N N E L S
MULTIPLEXER
SODIUM IODIDE QUADRANTS
A N A L O G TO DIGITAL CONVERTER
LSI INTELLIGENT
11/23 MULTIPLEXER
8 0 K WORD
QUADRANT
1
MEMORY
A
nr.
Q-BUS
A
ACC
ACC
CRATE
C R A T E S 3,4,5--
QUADRANT k
QUADRANT
11
i
rz
A
ACC
ACC
2
T
CRATE
2
2
1
DRIFT C H A M B E R , SCINTILLATOR DATA
PDP
UNIBUS
11/44
/ M A G \ DISK
F i g . 6.
\TAPE J
MB
D
BRANCH
HIGHWAY
DISP TERM
Schematic r e p r e s e n t a t i o n of the secondary t r i g g e r processor. Signals from the sodiun i o d i d e modules i n each quadrant are acquired through the I n t e l l i g e n t Multiplexers. Other p o r t i o n s of t h e experiment a r e acquired through the CAMAC Branch Highway. The MBD combines a l l p o r t i o n s of t h e data f o r transmission t o t h e PDP-11/44.
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CRYSTAL BOX MULTIPLEXER 8 DIGITIZER
L S I 11/23 INTERRUPTS STABILIZATION EVENT -
COMP. ROY. OPER. ROY.
DRIFT CHAMBER DATA
STABILIZATION EVENT SELECTED
SCINTILLATOR DATA
MASTER; TRIGGER SELECTED MASTER. TRIGGER
„SET, BITS
BRANCH MGHWKV TERM.
A-2 CLEARS BITS
T T EVENT N0-9 BUSY
CRYSTAL DATA ACQUISITION SYSTEM READY
- c r L S I NOT IN PROCESSING MODE
< 3
PDP
CRYSTAL DATA COLLECTED
BIT TESTED FOR PROCESSING COMPLETE
QUADRANT I • H
BRANCH HBHWAY
•m - SE DUMP
CRYSTALS
NO. II
NO. 12
II MBD
DRIFT CHAMBER NO. >
SCINTILLATOR! NO. 10
PROGRAMS
PERIPHERALS
i g . 7.
D e t a i l s of the secondary processor f o r one quadrant i l l u s t r a t i n g handling and system s y n c h r o n i z a t i o n .
