identification of worst-case forces
DESCRIPTION
Identification of Worst-Case Forces. Elwyn Baynham and Yury Ivanyushenkov Applied Science Division, Engineering and Instrumentation Department, RAL. MICE Collaboration Meeting, Osaka, August 1-3, 2004. Aims of work. - PowerPoint PPT PresentationTRANSCRIPT
1
Identification of Worst-Case ForcesIdentification of Worst-Case Forces
MICE Collaboration Meeting, Osaka, August 1-3, 2004
Elwyn Baynham and Yury Ivanyushenkov
Applied Science Division,Engineering and Instrumentation Department,
RAL
2
Aims of work
Calculation of axial magnetic forces in MICE by using OPERA package for various magnetic configurations:
• MICE final stage: - nominal and max p; - gap of 450mm and 600 mm, - non-flip and solenoidal modes;
• earlier stages of MICE.
3
Model in OPERA
Model:-18 coils;- no iron shielding
4
STEP I:
STEP II
STEP III
STEP IV
STEP V
STEP VII
By A.Blondel
MICE stages
5Alain Blondel
Step VII The full two-cell MICEibid. sensitivity will be better since volts will be higher.
can try various settings of polarities and absorbers (full / empty)and of absorber thicknesses (to match available RF or beam momentum)
MICE stages (2)
6
255 305
1260120
60200
620
263347
725
250
841
13751385 12501260
3660
(SFOFO, 200 MeV/c, beta=42 cm, gap =600 mm)
404
Centre coils: J=64.44 A/mm2
Focusing coils: J=113.95 A/mm2
Coupling coils: J=96.21 A/mm2
End #2 coils: J=67.11 A/mm2
255355
202
Matching #2 coils: J=41.46 A/mm2
2440
202
4541
4721
6041
6161
Matching #1 coils: J=65.06 A/mm2
End #1 coils: J=65.22 A/mm2
792
305
Gap=600
MICE magnetic system
Note:Geometry and currents fromWing and Ulisse
7
(SFOFO, p=200 MeV/c, beta=42 cm, gap =600 mm)
2.4 2.4
103.5
6.6
22
220
225
15.4236
103.5
6.6
22
220
225
15.4
236
All forces are in tonnes !
147 147
Centre coils: J=64.44 A/mm2
Coupling coils: J=96.21 A/mm2
End #2 coils: J=67.11 A/mm2
Matching #2 coils: J=41.46 A/mm2
Matching #1 coils: J=65.06 A/mm2
End #1 coils: J=65.22 A/mm2
Focusing coils: J=113.95 A/mm2
12.5 5
Forces in MICE magnetic system
15.4
8
(SFOFO, p=200 MeV/c, beta=42 cm, gap =450 mm)
4.1 4.1
83.9
13.9
20.8
235
228
14236
83.9
13.9
20.8
235
228
14
236
All forces are in tonnes !
147 147
Centre coils: J=64.44 A/mm2
Coupling coils: J=96.21 A/mm2
End #2 coils: J=67.11 A/mm2
Matching #2 coils: J=75.17 A/mm2
Matching #1 coils: J=56.30 A/mm2
End #1 coils: J=61.59 A/mm2
Focusing coils: J=113.95 A/mm2
24.3 7
Forces in MICE magnetic system
14
9
2.4
103.5
6.6
22
220
225
15.4236 147
12.5 5 15.4
4.1
83.9
13.9
20.8
235
228
14236 147
24.3 714
(SFOFO, p=200 MeV/c, beta=42 cm, gap =600 mm)
(SFOFO, p=200 MeV/c, beta=42 cm, gap =450 mm)
Forces Vs. Gap for p=200 Mev/c
10
(SFOFO, p=240 MeV/c, beta=42 cm, gap =600 mm)
1.4 1.4
101
2.9
24.4
316
324
23340
101
2.9
24.4
316
324
23
340
All forces are in tonnes !
147 147
Centre coils: J=64.44 A/mm2
Coupling coils: J=115.45 A/mm2
End #2 coils: J=67.11 A/mm2
Matching #2 coils: J=42.65 A/mm2
Matching #1 coils: J=78.12 A/mm2
End #1 coils: J=65.22 A/mm2
Focusing coils: J=136.74A/mm2
17.3 8
Forces in MICE magnetic system
23
11
(SFOFO, p=240 MeV/c, beta=42 cm, gap =450 mm)
2.4 2.4
79
9
23.3
366.6
328
21.5340
79
9
23.3
336.6
328
21.5
340
All forces are in tonnes !
147
Centre coils: J=64.44 A/mm2
Coupling coils: J=115.45 A/mm2
End #2 coils: J=67.11 A/mm2
Matching #2 coils: J=83.07 A/mm2
Matching #1 coils: J=66.82 A/mm2
End #1 coils: J=61.59 A/mm2
Focusing coils: J=136.74 A/mm2
147
33.3 38.6
Forces in MICE magnetic system
21.5
12
(SFOFO, p=240 MeV/c, beta=42 cm, gap =600 mm)
1.4
101
2.9
24.4
316
324
23340 147
17.3 8 23
(SFOFO, p=240 MeV/c, beta=42 cm, gap =450 mm)
2.4
79
9
23.3
366.6
328
21.5340 147
33.3 38.6 21.5
Forces Vs. Gap for p=240 Mev/c
13
Forces Vs.p for gap =450 mm
(SFOFO, p=200 MeV/c, beta=42 cm, gap =450 mm)
2.4
103.5
6.6
22
220
225
15.4236 147
12.5 5 15.4
(SFOFO, p=240 MeV/c, beta=42 cm, gap =450 mm)
2.4
79
9
23.3
366.6
328
21.5340 147
33.3 38.6 21.5
14
(NO-FLIP, p=200 MeV/c, beta=42 cm, gap =600 mm)
2.2 2.2
100.8
3.6
14
59.5
46
46.797
100.8
3.6
14
59.5
46
46.7
97
All forces are in tonnes !
146
Centre coils: J=63.81 A/mm2
Coupling coils: J=93.10 A/mm2
End #2 coils: J=67.11 A/mm2
Matching #2 coils: J=34.99 A/mm2
Matching #1 coils: J=68.33 A/mm2
End #1 coils: J=64.01 A/mm2
Focusing coils: J=68.03 A/mm2
146
39.4 13.5
Forces in MICE magnetic system
46.7
15
(‘Solenoidal’, p=200 MeV/c, beta=42 cm, gap =600 mm)
1.8 1.8
100.6
3.6
13.7
60.3
45
15.751.5
100.6
3.6
13.7
60.3
45
15.7
51.5
All forces are in tonnes !
146
Centre coils: J=63.81 A/mm2
Coupling coils: J=93.10 A/mm2
End #2 coils: J=67.11 A/mm2
Matching #2 coils: J=34.99 A/mm2
Matching #1 coils: J=68.33 A/mm2
End #1 coils: J=64.01 A/mm2
Focusing coils: J=68.03 A/mm2
146
26.3 15.3
Forces in MICE magnetic system
15.7
16
Net Force, tonne / Case
SFOFO, p=200 Mev/c, beta=42 cm
SFOFO, p=240 Mev/c, beta=42 cm
N0-FLIP, p=200 Mev/c,
beta=42 cm
‘Solenoid’, p=200 Mev/c,
beta=42 cm
Gap=450 mm
Gap=600 mm
Gap=450 mm
Gap=600 mm
Gap=600 mm
Gap=600 mm
Central focus pair 0 0 0 0 0 0
Edge focus pair 7from centre
5towards centre
38.6from centre
8towards centre
13.5towards centre
15.3towards centre
Coupling coil 14from centre
15from centre
21.5from centre
23from centre
46.7from centre
15.7towards centre
Tracker solenoid 24.3towards centre
12.5towards centre
33.3towards centre
17.3towards centre
39.4towards centre
26.3towards centre
Summary table for axial magnetic forces
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Conclusions and next steps
Conclusions:• so far the highest net forces on modules are created in NON-FLIP mode (but the highest net force on the edge focus pair is in case of p=240 MeV/c and gap of 450 mm) -> there is no a single worst mode for all the modules;• both the edge focus pair and the tracker solenoid (but not the coupling coil) are sensitive to the value of the gap;• forces are much higher for 240 MeV/c.
Next steps:• better definition of non-SFOFO modes – Non-flip, solenoidal;• definitions of magnetic configurations and force calculation for various MICE stages.