Boost Analysis Status Matt Weaver MDI Meeting March 31, 2006.
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Boost Analysis Status Matt Weaver MDI Meeting March 31, 2006
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Transcript of Boost Analysis Status Matt Weaver MDI Meeting March 31, 2006.
Boost Analysis Status
Matt Weaver
MDI Meeting
March 31, 2006
Combining 2y’(z) and dy’/dy(z) Fits
eff
effo
yz
zssz
2
2
2
222
'2
1)(
L
L
H
H
LLHHeff
2
L
LLH
HHo ffs
222
L
L
H
H
L
L
H
H
s
2
angular spread at waists precisely determined
asymptotic angular spread (z >> ) poorly determined
z scale factor
LL yyresyyres
eff
eff
boost sz
z
z
szdydz
yd22
2
22
2
2
2
2
2
22
2 )(1
1
1'
Together, these fits will determine both HER and LER emittances
Assuming equal *s and waist locations
Monte Carlo Validation 14mm * 14mm *
10mm * 10mm *
6mm * 6mm *
y’dy’/dy
z (cm)z (cm)
mra
d-c
m
mra
d
≤ 1 week data
5 fit parametersY*
y-waist z offsetH
L
2YY’ detector error
Fit 2 is a simple sumof the two 2s
No y’ dy’/dy} covariance terms included
*
(mm
)
wai
st z
(m
m)
H
(nm
)
L
(nm
)
generated value
Monte Carlo Fit Results
combined fity’(z) fit only
Run 5 Fit Results*
(m
m)
wai
st z
(m
m)
H
(nm
)
L
(nm
)
combined fity’(z) fit only
wai
st z
(m
m)
z-ce
ntr
oid
(m
m)
(Relative) waist offset anti-correlateswith movement of z-centroidas expected if magnetic waist
is static
Waist Location
2
2
24 d.o.f.
Combined Fit
wai
st z
(m
m)
z-ce
ntr
oid
(m
m)
(Relative) waist offset anti-correlates with movement of
z-centroid as expected if magnetic waist is static
Waist Location
wai
st z
(m
m)
Waist Location (more)2
YY
’ (m
rad
-cm
)
2YY’ detector error should
be constant, except for significant changes to detector
(e.g. loss of SVT module)Any variation in the fit may
indicate additional waist motion(HER vs LER)
Ideally, this parameter will bereplaced with a constant 2
YY’ and an additional waist offset.
2Y
Y’ (
mra
d-c
m) Monte Carlo
Y
(m
)S
pec
ific
Lu
min
osi
ty
Y derived from combined-fit results shows good anti-correlation with specific luminosity
Lu
min
ou
s Y
(0)
(m
)Comparison with Josh
*
(mm
)
Don’t see muchcorrelation.
Error barsare
complementaryin scale.
Run 5b may bean interestingcomparison
HE
R B
un
ch C
urr
ent
(mA
)
LE
R B
un
ch C
urr
ent
(mA
)
Lu
min
osi
ty
Other Machine Conditions
Run 4 Combined Fit Results*
(m
m)
wai
st z
(m
m)
H
(nm
)
L
(nm
)
Y
(m
)
YL
(m
)
2
2
24 d.o.f.
