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Aperture for AFP, ALICE, and LHCb (LHC). M. Giovannozzi Acknowledgements: H. Burkhardt , B. Holzer , D. Macina , M. A. Gallilee , J. Jowett, G. Spigo. Disclaimer: unless otherwise stated, nominal parameters are used. AFP layout - I. AFP layout - II. Layout provided by G. Spigo . - PowerPoint PPT Presentation
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MG - LEB meeting 1
Aperture for AFP, ALICE, and LHCb (LHC)
M. Giovannozzi Acknowledgements: H. Burkhardt, B. Holzer, D. Macina, M. A. Gallilee, J. Jowett, G. Spigo
15/06/2012
Disclaimer: unless otherwise stated, nominal parameters are used.
MG - LEB meeting 2
AFP layout - I
15/06/2012
MG - LEB meeting 3
AFP layout - II• Layout provided by G. Spigo.• Defined maximum aperture markers
for MAD-X model:– Mechanical tolerances equal to those of
neighbouring magnetic elements, i.e., 0.84 mm radial, 0.36 mm horizontal.
– Aperture definition: maximum rectangle inscribed into real aperture shape.
• Defined installation of markers for Beam 1 and Beam 2 elements.
• Defined offset files.• No change in position between
injection and top energy.• All files (and sample job) available
under afs at ~giovanno/public/For_AFP
15/06/2012
MG - LEB meeting 4
AFP aperture: results - I
15/06/2012
02468
101214161820
-250 -200 -150 -100 -50 0 50 100 150 200 250
n1 (s
igm
a)
Distance (m)
AFP - Beam 1 - inj
AFP - Beam 2 - inj
02468
101214161820
-250 -200 -150 -100 -50 0 50 100 150 200 250
n1 (s
igm
a)
Distance (m)
AFP - Beam 1 - inj
AFP - Beam 2 - inj
b*=11 mq=170 mradSep=2 mm
MG - LEB meeting 5
AFP aperture: results - II
15/06/20120
102030405060708090
100
-250 -200 -150 -100 -50 0 50 100 150 200 250
n1 (s
igm
a)
Distance (m)
AFP - Beam 1 - colAFP - Beam 2 - col
0102030405060708090
100
-250 -200 -150 -100 -50 0 50 100 150 200 250
n1 (s
igm
a)
Distance (m)
AFP - Beam 1 - colAFP - Beam 2 - col
b*=0.55 mq=142.5 mradSep=0.5 mm
MG - LEB meeting 6
Alice beam pipe - I• New layout before LS2: certified (by M. A.
Gallilee) nominal layout.• New layout after LS2: certified (by M. A. Gallilee)
proposed layout.• S-dependent tolerances have been introduced
for both layouts.• Several configurations considered:– Nominal injection– Nominal collision – proton physics– Nominal squeezed - ion physics
15/06/2012
MG - LEB meeting 7
Alice beam pipe - II
15/06/2012
0.000
0.002
0.004
0.006
0.008
0.010
0.00
0.05
0.10
0.15
0.20
0.25
-20 -15 -10 -5 0 5 10 15 20
Tole
ranc
es (m
)
Aper
ture
(m)
S (m)
LS2 aperture Nom apertureLS2 tol. Nom. Tol.
MG - LEB meeting 815/06/2012
Alice aperture: results - I
0
50
100
150
200
250
-20 -15 -10 -5 0 5 10 15 20
n1 (s
)
Distance from IP (m)
Beam 1 - Nominal - Inj Beam 1 - After LS2 - Inj
05
101520253035404550
-7 -5 -3 -1 1 3 5 7
n1 (s
)
Distance from IP (m)
Beam 1 - Nominal - Inj Beam 1 - After LS2 - Inj
b*=10 mqext=170 mradSep=2 mm
• R = 17.2 mm, tol. = 5.1 mm -> n1 = 4.1 s• R = 19.2 mm, tol. = 5.1 mm -> n1 = 8.4 s
MG - LEB meeting 9
Alice aperture: results - II
15/06/2012
0
200
400
600
800
1000
1200
-20 -15 -10 -5 0 5 10 15 20
n1 (s
)
Distance from IP (m)
Beam 1 - Nominal - Coll Beam 1 - After LS2 - Coll
Beam 1 - Nominal - Ions Beam 1 - After LS2 - Ions
-10
10
30
50
70
90
110
130
150
-7 -5 -3 -1 1 3 5 7
n1 (s
)
Distance from IP (m)
Beam 1 - Nominal - Coll Beam 1 - After LS2 - Coll
Beam 1 - Nominal - Ions Beam 1 - After LS2 - Ions
b*=10 mqtotal=88 mradSep=0.5 mmb*=0.6 mqtotal=150 mradSep=0.7 mm
MG - LEB meeting 10
LHCb beam pipe - I• New layout before LS2: certified (by M. A.
Gallilee) nominal layout.• New layout after LS2: certified (by M. A. Gallilee)
proposed layout.• S-dependent tolerances have been introduced
for both layouts.• Several configurations considered:– Nominal injection– Nominal collision – proton physics– Nominal squeezed – proton physics
15/06/2012
MG - LEB meeting 11
LHCb beam pipe - II
15/06/2012
0.000
0.002
0.004
0.006
0.008
0.010
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
-20 -15 -10 -5 0 5 10 15 20
Tole
ranc
es (m
)
Aper
ture
(m)
S (m)
LS2 aperture Nom apertureLS2 tol. Nom. Tol.
MG - LEB meeting 1215/06/2012
LHCb aperture: results - I
0
50
100
150
200
250
-20 -15 -10 -5 0 5 10 15 20
n1 (s
)
Distance from IP (m)
Beam 1 - Nominal - Inj Beam 1 - After LS2 - Inj
05
101520253035404550
-7 -5 -3 -1 1 3 5 7
n1 (s
)
Distance from IP (m)
Beam 1 - Nominal - Inj Beam 1 - After LS2 - Inj
b*=10 mqext=170 mradSep=2 mm
MG - LEB meeting 13
LHCb aperture: results - II
15/06/2012
0100200300400500600700800900
-20 -15 -10 -5 0 5 10 15 20
n1 (s
)
Distance from IP (m)
Beam 1 - Nominal - Coll Beam 1 - Nominal -SqueezedBeam 1 - After LS2 - Coll Beam 1 - After LS2 - Squeezed
020406080
100120140160180200
-7 -5 -3 -1 1 3 5 7
n1 (s
)
Distance from IP (m)
Beam 1 - Nominal - Coll Beam 1 - After LS2 - Coll
Beam 1 - Nominal - Ions Beam 1 - After LS2 - Ions
b*=10 mqtotal=370 mradSep=2 mmb*=3 mqtotal=265 mradSep=0.7 mm
MG - LEB meeting 14
Conclusions for nominal LHC - I• AFP
– Current proposal is compatible with aperture requirements. It is also compatible with high-beat optics.
– Further aperture restrictions (installation of Ferrites) should be re-evaluated.– Compatibility between AFP and ALFA should be carefully assessed.– The AFP area will be completely changed in the HL-LHC era.
• Alice– Too small aperture at injection beyond -2 m from IP!– High-beta optics not considered: it will enhance the aperture problems.– Top energy configurations are fine.
• LHCb– No specific problems found.– V-crossing at top energy with b*=3 m considered: no problem found
• All the files for Alice and LHCb are available under– /afs/cern.ch/eng/lhc/optics/V6.503/aperture: nominal beam pipe– /afs/cern.ch/eng/lhc/optics/V6.503/aperture/as-built: upgraded beam pipe
Any feedback is more then welcome!15/06/2012
MG - LEB meeting 15
Conclusions for nominal LHC - II
An important remark: the running conditions after LS2 are not completely defined (or at least known to me). An exhaustive analysis is therefore not possible, to date.
15/06/2012