adi bornheim test beam meeting - cms...
TRANSCRIPT
Las
er S
ou
rce
Per
form
ance
in 2
004
at H
4
Adi
Bor
nhei
mC
ALT
EC
H
Tes
t Bea
m M
eetin
g -
CM
S W
eek
9. J
une
2004
-C
ER
N
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
2
Las
er S
ou
rce
Bea
m T
est
Pre
par
atio
n
•La
ser
switc
hed
off d
urin
g w
inte
r -
Inte
rnal
coo
ling
wat
er d
rain
ed -
Rep
lace
d fa
ulty
mai
n tr
ansf
orm
er -
Che
ck fu
nctio
nalit
y w
ith
‘bric
olag
e’ c
oolin
g in
Mar
ch -
All
Lase
rs f
unct
iona
l.
•S
witc
h on
lase
rs in
Apr
il af
ter
Nor
th A
rea
Coo
ling
back
-C
heck
fu
nctio
nalit
y of
all
thre
e sy
stem
s -
One
blu
e la
ser
show
ed p
robl
em
and
coul
d no
t be
oper
ated
.
•A
fter
iden
tifyi
ng th
e ca
use
and
in v
iew
of t
he u
pcom
ing
beam
test
it
was
dec
ided
to c
all i
n se
rvic
e in
stea
d of
atte
mpt
ing
self-
repa
ir.
(N
on-t
ypic
al Y
LF c
ryst
al m
ount
dam
age
-M
anuf
actu
rer
clai
ms
~7
year
s lif
etim
e fo
r th
is p
art)
•S
ervi
ce v
isit
17.-
19. M
ay
-al
l thr
ee la
sers
rea
dy
afte
r th
at.
Per
form
ance
(pe
ak e
nerg
y, p
ulse
wid
th, t
ime
jitte
r) s
imila
r to
200
3.
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
3
2004
E0’
Bea
m T
est
Issu
es
•V
PT
sca
n’t s
ee 7
00nm
/800
nm ⇒
Don
’t us
e R
ed L
aser
.
(onl
y qu
ick
look
with
red
lase
r -
may
be s
ome
test
s sh
ould
be
done
to
get a
bet
ter
feel
ing
for
sign
al s
ize
-in
200
3 w
e ra
n 80
0 nm
at l
ess
than
10%
inte
nsity
and
with
10
dB fi
lter)
•V
PT
sne
ed m
ore
light
than
AP
Ds
⇒R
un a
t hig
her
inte
nsity
(to
be ta
ken
into
acc
ount
for
CM
S r
unni
ng ?
)
•It
appe
ars
that
ther
e is
a 1
0 dB
ligh
t los
s as
see
n b
y th
e M
EM
box
es
com
pare
d to
200
3. (
som
ewhe
re a
fter
the
1x80
sw
itch)
⇒
to b
e ch
ecke
d af
ter
the
beam
test
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
4
BL
UE
:U
se ‘L
aser
2’ t
o ru
n at
44
0 n
m
and
set u
p ‘L
aser
1’ t
o ru
n at
49
5 n
m
RE
DLa
ser:
700
nm
/ 80
0 n
m n
ot
visi
ble
to V
PT
s
Las
er s
ou
rce
layo
ut
at H
4
Blu
e
spar
e
Red
Blu
e
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
5
Few
Det
ails
on
th
e S
ou
rce
Mo
nit
or
Mai
n B
eam
Inte
nsity
Reg
ulat
or
Bea
m S
plitt
er 9
9%/1
%
Mai
n La
ser
Out
put
Mon
itor
Bea
m
Bea
m-F
iber
Cou
plin
g
To
Sou
rce
Mon
itor
To
Sup
er M
odul
e
Few
Not
es :
Lase
r m
ax p
ulse
rat
e is
100
Hz,
Las
er s
ourc
e m
onito
r D
AQ
run
s at
1Hz.
Lase
r S
ourc
e M
onito
r in
tegr
ates
the
lase
r pu
lse
sign
al fr
om a
dio
de w
ith a
dig
ital s
cope
.La
ser
sour
ce m
onito
r is
mea
nt to
hel
p to
adj
ust a
nd m
onito
r la
ser
perf
orm
ance
.In
tens
ity r
egul
ator
is n
ot a
hig
h pr
ecis
ion
(sub
%)
devi
ce, a
t ver
y lo
w in
tens
ity s
ettin
gs.
The
inte
nsity
mea
sure
men
t of t
he s
ourc
e m
onito
r is
(ca
n be
) ca
libra
ted
with
a p
hoto
met
er.
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
6
Ove
rvie
w L
aser
Per
form
ance
200
4
�S
ho
rt t
erm
sta
bili
ty g
oo
d (
slig
htl
y b
ette
r th
an 2
003)
-L
on
g t
erm
sta
bili
ty w
ors
e th
an 2
003.
�P
erfo
rman
ce s
uff
icie
nt
for
rad
iati
on
mo
nit
ori
ng
(S
ee P
atri
ce’s
tal
k).
Tim
e [h
ou
rs]
Int_rel
No
rth
Are
a C
oo
ling
Pro
ble
m
Pu
lse
Sh
ape
Sp
litti
ng
Tes
t
Tu
rnta
ble
Po
wer
Cu
t P
rob
lem
Tu
rnta
ble
Pro
ble
m
E0’
Sta
bili
ty
E0’
Irra
dia
tio
nE
0’ S
etu
p
YL
F I
nst
abili
ty
YL
F I
nst
abili
ty
No
te :
Las
er D
AQ
rec
ord
s m
uch
mo
re e
ven
ts in
200
4 th
an in
200
3 d
ue
to a
dd
itio
nal
ran
do
m t
rig
ger
s se
nd
to
lase
r !
Plo
ts t
hu
s lo
ok
dif
fere
nt
!
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
7
Lo
ng
Ter
m D
egra
dat
ion
of
Las
er 2
at
440
nm
0.36
0.380.4
0.42
0.44
0.46
0.480.5
600
650
700
750
800
850
.T
ime
[ho
urs
]
Int_rel
-1.2
8 %
/day -1
.97
%/d
ay -1.6
7 %
/day
Deg
rad
atio
n ~
con
stan
t o
ver
~300
h.
Cau
sed
by
YL
F p
um
p la
mp
(‘s
tan
dar
d d
egra
dat
ion
’) (
?)
Co
nti
nu
es d
uri
ng
‘po
wer
off
’.D
egra
dat
ion
is ‘r
eal’
(see
n in
E0’
/ME
M).
�
No
att
emp
t w
as m
ade
to f
ix t
his
!
Inve
stig
atio
n d
iffi
cult
wit
ho
ut
inte
rru
pti
ng
Las
er -
Rad
iati
on
mo
nit
ori
ng
wo
rks.
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
8
Co
mp
aris
on
Deg
rad
atio
n 2
003
/ 200
4
0.3
6
0.3
8
0.4
0.4
2
0.4
4
0.4
6
0.4
8
0.5
60
06
50
70
07
50
80
08
50
.
Tim
e [h
ou
rs]
Int_rel
2004
2003
No
te :
Inte
nsi
ty S
cale
Arb
itra
ry !
!!A
lign
ed t
o h
ave
com
mo
n ‘0
’.(H
ow
ever
: S
cale
ag
rees
wit
h p
ow
er s
etti
ng
s)
2004
: ~
-1.
6% (
w.r
.t. 0
.5)
2003
: ~
-0.
4% (
w.r
.t. 0
.28)
Bu
t :
Do
es t
his
mat
ter
??
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
9
Pu
lse
wid
th h
isto
ry 2
004 T
ime
[ho
urs
]
Pulse Width [ns]
�P
uls
e w
idth
see
ms
to b
e n
ot
affe
cted
as
mu
ch a
s p
uls
e en
erg
y -
Bel
ow
30
ns.
Mai
n f
eatu
res
des
crib
ed in
th
e P
uls
e E
ner
gy
plo
t.
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
10
Gre
en L
aser
(49
5 n
m)
Per
form
ance
Tim
e [h
ou
rs]
Int_rel
495
nm
op
erat
ion
is m
ean
t fo
r sy
stem
atic
cro
ss c
hec
ks o
f th
e ra
dia
tio
n m
on
ito
rin
g.
Pro
du
cin
g 4
95 n
m li
gh
t w
ith
a T
iSL
aser
is v
ery
dif
ficu
lt.
Op
tim
al t
un
ing
pro
vid
es li
gh
t w
ith
in s
pec
s :
<10
% p
uls
e en
erg
y va
riat
ion
, <40
ns
pu
lse
du
rati
on
AP
D/P
N d
epen
ds
on
pu
lse
ener
gy
and
pu
lse
wid
th �
Sys
tem
atic
sH
ow
dif
fere
nt
will
th
e ra
dia
tio
n d
amag
e m
easu
red
at
440/
495
be
?S
om
e g
reen
dat
a h
as b
een
tak
en in
200
3 an
d in
200
4 �
to b
e st
ud
ied
?
Init
ial t
un
ing
OK
-si
mila
r to
200
3.
�F
ast
deg
rad
atio
n a
t 49
5 n
m.
495
nm
dro
pp
ed o
ut
of
spec
so
on
.R
emo
ved
fro
m d
ata
taki
ng
.
Sam
e re
aso
n a
s 44
0 n
m d
egra
dat
ion
?
Po
wer
/Wid
th t
un
ing
Pu
mp
Cu
rren
t T
est
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
11
Las
er In
ten
sity
Deg
rad
atio
n
0.02
8
0.03
0.03
2
0.03
4
0.03
6
0.03
8
0.04
0.04
2 770
780
790
800
810
820
830
840
850
0.36
0.37
0.38
0.390.4
0.41
0.42
760
770
780
790
800
810
820
830
840
850
Tim
e [h
ou
rs]
Int_rel
Lase
r 1
Lase
r 2
-4.7
%/d
ay
-2.0
%/d
ay
No
te :
Inte
nsi
ty S
cale
Arb
itra
ry !
!! A
pp
aren
t si
mila
r sl
op
e ac
cid
enta
l !!
Bo
th la
sers
sh
ow
mu
ch f
aste
r d
egra
dat
ion
th
an L
aser
2 in
200
3.
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
12
A f
ew g
ener
al r
emar
ks
•La
ser
mon
itorin
g ha
s to
mea
sure
LH
C in
duce
d ra
diat
ion
dam
age
-w
hich
has
a ~
12 h
tim
e sc
ale.
•P
reci
se in
-situ
cal
ibra
tion
met
hods
hav
e tim
e sc
ales
of
days
-w
eeks
-m
onth
.
•E
CA
L st
abili
ty h
as to
be
ensu
red
on th
ese
time
scal
es.
•W
hat i
s th
e be
st s
trat
egy
with
res
pect
to d
iffer
ent
wav
elen
gth
-in
tens
ity -
long
and
sho
rt te
rm s
tabi
lity
… ?
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
13
Infr
aRed
(800
nm
) M
on
ito
rin
g in
200
3 B
eam
Tes
t
Raw
sig
nal
s -
mea
n v
alu
es p
er r
un
(E
CA
L)
-av
erag
ed o
ver
tim
e b
ins
-sc
ale
arb
itra
ry, a
dju
sted
to
mea
n v
alu
e -
no
co
rrec
tio
ns
(no
n-l
inet
c.)
0.06
1
0.06
2
0.06
3
0.06
4 340
360
380
400
420
440
460
480
Las
er M
on
ito
r 80
0 n
m
EC
AL
Las
er R
un
s (a
vera
ged
)
T [
ho
urs
]
rel. Intensity
1 %
Mo
nit
ors
en
tire
LD
S c
hai
n f
rom
th
e 1x
2 sw
itch
on
-V
alu
able
cro
ss s
yste
mat
ic c
hec
k !
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
14
Lo
ng
Ter
m S
tab
ility
fro
m 2
003
Tes
t B
eam
Co
mp
are
stab
ility
(E
CA
L L
aser
ru
ns
AP
D(m
ean
)/P
N(m
ean
) as
se
en w
ith
440
nm
an
d 8
00n
m :
V:
~1.7
‰
AP
D/P
N
440n
m
V:
~0.5
‰
AP
D/P
N
800n
m
2004
dat
a to
co
me
…
09.0
6.20
04A
di B
ornh
eim
-La
ser
Sou
rce
Per
form
ance
-C
MS
Wee
k Ju
ne 2
004
15
Su
mm
ary
•L
aser
Per
form
ance
200
4 su
ffic
ien
t -
so f
ar ..
�S
ee P
atri
ce’s
tal
k fo
r a
mo
re q
uan
tita
tive
sta
tem
ent
..•
Lo
ng
ter
m s
tab
ility
wo
rse
than
200
3 -
seem
ing
ly c
ause
d b
y a
‘glo
bal
eff
ect’
(L
aser
2 a
nd
Las
er 1
).
�u
nd
er in
vest
igat
ion
…•
En
dC
apB
eam
Tes
t ra
ises
sev
eral
issu
es -
Red
vs
Gre
en -
Lig
ht
inte
nsi
ty n
eed
s -
..•
Bea
m T
est
very
val
uab
le -
Eve
n w
ith
ou
t b
eam
!
To
Do
:In
vest
igat
e si
gn
al d
ecre
ase.
In
vest
igat
e 10
dB
lig
ht
loss
.T
ry 4
95 a
gai
n !
Try
800
/700
ag
ain
aft
er 1
0 d
B s
olv
ed !
So
me
mo
dif
icat
ion
s to
Las
er D
AQ
in t
he
wo
rks.
Nee
d t
o im
pro
ve L
aser
Bar
rack
en
viro
nm
ent
!!