Octal ASD Certification Tests at Michigan J. Chapman...
23
Octal ASD Certification Tests at Michigan J. Chapman, Tiesheng Dai, & Tuan Bui August 30, 2002 - CERN
Transcript of Octal ASD Certification Tests at Michigan J. Chapman...
Oct
al A
SD C
ertif
icat
ion
Test
s at M
ichi
gan
J. C
hapm
an, T
iesh
eng
Dai
, & T
uan
Bui
Aug
ust 3
0, 2
002
-CER
N
Goa
ls o
f Mic
higa
n Te
st
•C
onfir
m a
ctua
l dea
dtim
e vr
s set
ting.
•H
its/e
vent
vrs
trig
ger r
ate
(I/O
traf
fic te
st).
(Hav
e ob
serv
ed a
feat
ure
abov
e 20
KH
z).
•O
pera
te in
pai
r & e
dge
mod
es.
•M
easu
re d
rift s
pect
rum
& p
ulse
wid
th.
•Te
st g
ener
al st
abili
ty w
ith ti
me.
•Ex
amin
e hi
gh-r
ate
beha
vior
.
Har
dwar
e on
Cha
mbe
r
•17
AM
T2
Oct
al M
ezz
card
s wer
e in
stal
led.
O
ne fo
r a
trigg
er
inje
ctor
.
To th
e rig
ht is
the
setu
p sc
reen
for t
he A
SD.
Bel
ow is
the
AM
T se
tup
Impo
rtant
setti
ngs:
Sear
ch W
indo
w =
1.8
25µs
Mat
ch W
indo
w =
1.2
µs
ASD
Dea
dtim
e =
790
ns
Cos
mic
dat
a is
take
n w
ith
lead
ing/
trai
ling
mod
e.
Oth
er te
sts a
re d
one
in p
air
mod
e
AM
T &
ASD
setti
ngs
•D
ata
Inte
grity
Che
ck–
EVID
Mat
ch–
BC
ID M
atch
–D
ata
Stru
ctur
e•
Dat
a si
ze o
f eac
h TD
C•
Hea
d/Tr
aile
r cor
rect
–Pa
rity
Erro
r–
TDC
Err
ors
•Er
ror d
etai
ls a
re re
cord
ed
for f
urth
er a
naly
sis
•TD
C e
rror
repo
rts a
re
chec
ked
at e
nd o
f run
Onl
ine
Dat
a M
onito
r
Trig
gers
1.C
osm
ic tr
igge
r (2
4Hz)
OR
edw
ith1.
Con
tinuo
us p
ulse
r tr
igge
r fr
om 1
00H
z to
10
0KH
z.
400
Tick
s
Hig
h R
ate
Test
Diff
icul
ties
•A
MT-
2 le
vel 1
buf
fer a
ddre
ss “
bug”
has
two
effe
cts t
hat c
ompl
icat
e pr
ecis
e te
stin
g.–
At h
igh
trigg
er ra
tes &
mod
est h
it ra
te, h
its lo
st.
–A
t hig
h tri
gger
rate
s, re
adou
t of h
its n
ot in
the
mat
ch w
indo
w o
ccur
. Noi
se is
exa
gger
ated
.•
With
DA
Q u
sed,
full
read
out i
s lim
ited
to a
fe
w K
Hz.
For
trig
ger r
ates
up
to 1
00K
Hz+
pr
esca
le sa
mpl
ing
was
em
ploy
ed.
Con
ditio
ns fo
r Hit
Mis
s
Fals
e hi
ts a
bove
20K
Hz
Plot
show
s hit
rate
at 6
0mV
th
resh
old
in a
1.
2 µs
mat
ch
win
dow
. Rat
e is
a
few
hits
per
10
,000
eve
nts
in e
ach
chan
nel
belo
w 2
0KH
z &
rise
s 8 fo
ld a
t hi
gh ra
tes.
~8 fo
ld R
ise
at 2
0KH
z
Noi
se P
erfo
rman
ce
Uns
hiel
ded
hedg
ehog
s
Shie
lded
hed
geho
gsha
ve m
uch
smal
ler
nois
e ra
te.
20ns
wid
th 5
0ns
perio
d pu
lse
inje
cted
into
Mez
z.Ca
rd
0
100
200
300
400
500
600
700
800
900
300
370
440
510
580
650
720
790
Expe
cted
Dea
dtim
e (n
s)
Measured Deadtime (ns)
TDC
3 C
hann
el 6
TDC
1 C
hann
el 4
TDC
2 C
hann
el 4
TDC
2 C
hann
el 0
TDC
1 C
hann
el 0
Dea
dtim
e M
easu
rem
ent
Aver
age
Dea
dtim
e vs
. DAQ
Rat
eTD
C 3
, Cha
nnel
0
010
020
030
040
050
060
070
080
0
100
1100
1100
021
000
8500
0D
AQ R
ate
(Hz)
Deadtime (ns)
300
Setti
ng37
0 Se
tting
440
Setti
ng51
0 Se
tting
580
Setti
ng65
0 Se
tting
720
Setti
ng79
0 Se
tting
Dea
dtim
e vr
s DA
Q R
ate
ASD
noi
se fe
atur
e•
ASD
mai
n th
resh
old
is
set t
o –1
0mV
. One
ex
pect
s tha
t mos
t hits
ar
e in
trodu
ced
by A
SD•
For t
his c
ase
the
puls
e w
idth
seen
is n
arro
w,
arou
nd 2
0ns
ASD
Noi
se P
ulse
Wid
th
Mea
sure
men
ts a
re
done
with
nom
inal
60
mV
thre
shol
d &
ch
ambe
r H
V o
n, so
w
idth
dis
trib
utio
n in
clud
es r
eal
ioni
zatio
n hi
ts fr
om
cham
ber
& A
SD
nois
e hi
ts.
ASD
Noi
se
“Rea
l Hit
Noi
se”
Hit
Wid
th D
istri
butio
n
At 6
0mV
& a
bove
the
hits
per
cha
nnel
rea
ch
a pl
atea
u &
are
mos
tly“r
eal”
cha
mbe
r si
gnal
s
At l
ow th
resh
old
hits
ar
e fr
om A
SD n
oise
fa
lling
with
thre
shol
d.
Hit
Rat
e vs
Thr
esho
ld
For
this
test
the
trig
ger
sign
al is
inje
cted
into
a
mez
z ca
rd fo
r di
gitiz
atio
n &
to th
e tr
igge
r. T
he
mea
sure
d tim
e sh
ould
be
unifo
rmly
dis
trib
uted
in a
25
nsw
indo
wsi
nce
the
digi
tizat
ion
cloc
k is
not
sy
nchr
oniz
ed to
the
trig
ger
puls
er. A
uni
form
,na
rrow
& la
rge
wid
this
ex
pect
ed fo
r th
ese
puls
es.
Tim
e &
Wid
th M
easu
rem
ent
Wid
th e
ncod
esam
plitu
de
Hits
from
Cos
mic
Ray
Fine
Tim
e M
easu
rem
ent
Cos
mic
Ray
Obs
erva
tion
ASD
Noi
se
Cos
mic
Ray
Spe
ctru
m
Low
rec
onst
ruct
ion
effic
ienc
y of
6 la
yer
cosm
ic tr
acks
is d
ue
to d
ead
chan
nels
. M
ost o
f the
loss
is
trac
ed to
shor
ts &
op
en c
ircu
its o
n th
e sh
ield
ed h
edge
hog
card
s.
Rec
onst
ruct
ion
Effic
ienc
y
Was
0.4
5 fo
run
shie
lded
17 M
ezza
nine
Car
ds a
re
test
ed a
t 100
KH
z D
AQ
ra
te in
clud
ing
cosm
ic
ray
trig
ger.
Sys
tem
run
s w
ithou
t any
pro
blem
s.
Ave
rage
eve
nt si
ze is
36
.29
(= 0
.29
hits
per
ev
ent)
& is
con
stan
t ov
er a
long
per
iods
.
(ASD
isst
able
& q
uite
)
Stab
ility
Tes
t at 1
00K
Hz
Ope
rate
Mez
zani
ne C
ard
for
long
dri
ft ti
mes
with
out
prob
lem
s (A
SD is
stab
le &
qu
iet o
ver
long
per
iods
)
Pair
mod
e ca
nnot
be
used
w
ith lo
ng d
rift
tim
es d
ue to
lim
ited
num
ber
of b
its. C
an
a) sl
ow d
own
cloc
k or
b)
use
lead
ing
& tr
ailin
g ed
ge
mod
e.
Hits
with
lead
ing
edge
>
1.6µ
s are
lost
DA
Q fo
r Lon
g D
rift T
ime
Con
clus
ions
•Fr
om a
n op
erat
iona
l sta
ndpo
int t
he A
SD w
orks
w
ithou
t pro
blem
& is
cap
able
of t
rigg
erin
g at
100
KH
z.•
The
mea
sure
d av
erag
e A
SD d
eadt
ime
is a
s exp
ecte
d.
One
ASD
cha
nnel
was
out
side
the
typi
cal p
atte
rn.
•T
he m
easu
red
hit r
ate
for
a H
V-o
n-ch
ambe
r is
abo
ut
1KH
z pe
r m
ezza
nine
car
d w
hen
the
ASD
thre
shol
d is
60
mV
or
abov
e.
•W
e ob
serv
e co
smic
ray
s at l
ow tr
igge
r ra
te.
•W
e ar
e un
able
to p
erfo
rm h
igh
rate
test
s due
to th
e kn
own
AM
T p
robl
em. W
e ob
serv
e no
ASD
pro
blem
s.•
It is
pos
sibl
e to
ope
rate
ASD
/AM
T m
ezza
nine
car
d w
ith lo
ng d
rift
tim
es b
ut w
ith d
eadt
ime
less
than
800
ns.
