PS2 Orbit Correction - Update
8
PS2 Orbit Correction - Update Wolfgang Bartmann PS2 Meeting, 26 th March 09 26-Mar-09 1 PS2 Orbit Correction - Update
description
PS2 Orbit Correction - Update. Wolfgang Bartmann PS2 Meeting, 26 th March 09. Error Assignment. Misalignments Dipoles:0.3 mm shift and 0.3 mrad angle for all axes Quadrupoles:0.2 mm shift and 0.3 mrad angle for all axes Field Errors Dipoles Δ B L/B ρ :0.5 10 -3 - PowerPoint PPT Presentation
Transcript of PS2 Orbit Correction - Update
PS2 Orbit Correction - Update 1
PS2 Orbit Correction - Update
Wolfgang Bartmann
PS2 Meeting, 26th March 09
26-Mar-09
PS2 Orbit Correction - Update 2
Error Assignment
• MisalignmentsDipoles: 0.3 mm shift and 0.3 mrad angle for
all axesQuadrupoles: 0.2 mm shift and 0.3 mrad angle for all axes
• Field ErrorsDipoles ΔBL/Bρ : 0.510-3
All errors are gaussian distributed with a cut-off at 3σ
26-Mar-09
PS2 Orbit Correction - Update 3
Positions of Correctors and BPMs
Horizontal corr. (black)Vertical corr. (red)
BPMs for both planes at each corrector
one vert. corrector removed in the centre
56 hor. and 54 vert. correctors;
110 BPMs
26-Mar-09
Sensitivity to different errorsError Aver. maximum
displacement in [mm]
Hor. Vert.
Relative dipole field error ΔBL/Bρ 0.5 10-3 TGAUSS(3) 8.8 -
Transverse quadrupole shift DX, DY 0.2 mm TGAUSS(3) 8.8 8.6
Longitudinal dipole shift DS 0.3 mm TGAUSS(3) 0.3 -
Tilt of dipoles about s-axis DPSI 0.3 mrad TGAUSS(3) - 5.4
Calculated with a sample of 50 machines; Qx = 13.25Qy = 8.21
26-Mar-09 4PS2 Orbit Correction - Update
PS2 Orbit Correction - Update 5
Results before/after correctionBefore correction After correction
Horizontal Vertical Horizontal Vertical
Average of max. displacement [mm] 13.56 11.63 0.54 0.43Average of r.m.s displacement [mm] 5.16 4.97 0.15 0.11
• Calculated with a sample of 500 machines
• Qx = 13.25, Qy = 8.21
• 100 correctors (instead of 110) in use; failure of 5 % of the monitors
• Corrector kicks are below 1 mrad (maxima ~ 0.2 mrad)
ρ = length/θ = 0.3/2e-4 = 1500 m
B = (Bρ)extr/ρ = 170/1500 ≈ 0.12 T
26-Mar-09
6
Orbit before/after correction, hor.500 machines
26-Mar-09 PS2 Orbit Correction - Update
4.86
6.86
8.86
10.8
6
12.8
6
14.8
6
16.8
6
18.8
6
20.8
6
22.8
6
24.8
6
26.8
6
28.8
6
30.8
6
32.8
60
10
20
30
40
50
60
xmax [mm]
Num
ber o
f mac
hine
s
0.24
0.34
0.44
0.54
0.64
0.74
0.84
0.94
1.04
1.14
1.24
1.34
1.44
1.54
1.64
1.74
0
10
20
30
40
50
60
70
80
90
xmax [mm]
Num
ber o
f mac
hine
s
PS2 Orbit Correction - Update 7
Orbit before/after correction, vert.500 machines
26-Mar-09
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.40
1.50
1.60
1.70
0
20
40
60
80
100
120
ymax [mm]
Num
ber o
f mac
hine
s
5.0
7.0
9.0
11.0
13.0
15.0
17.0
19.0
21.0
23.0
25.0
27.0
29.0
31.0
33.0
0
10
20
30
40
50
60
ymax [mm]
Num
ber o
f mac
hine
s
PS2 Orbit Correction - Update 8
Conclusion
• Orbit corrected by a factor of ≈ 25 OK
• Failure of correctors and monitors no issue
• Maximum corrector strength ≈ 0.2 mrad gives B = 0.12 T for 0.3 m length
26-Mar-09
