Power Moter - Silk Bank · Title: Power Moter Created Date: 11/13/2018 11:03:01 AM
MOTER for the A1900 - LISE++lise.nscl.msu.edu/moter/MOTER_2008_08_01b.pdf · 2008-08-02 · MH....
Transcript of MOTER for the A1900 - LISE++lise.nscl.msu.edu/moter/MOTER_2008_08_01b.pdf · 2008-08-02 · MH....
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MH. 08/01/08, East Lansing, MI 1
MOTER for the A1900MOTER for the A1900Overview:
From GICOSY to MOTERDipoles and Fringe FieldsThe A1900, as calculated– I.e. optics prior to 2007 vault reconfiguration– Ray tracing a few selected particles– Observations– A look at optical properties– Tracing more (random) particles
The A1900 with and without “std. Ratios”
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MH. 08/01/08, East Lansing, MI 2
GICOSY to MOTERGICOSY to MOTERMOTER is different from transfer map based optics codes– Magnetic elements include drifts up- and downstream– Fringe fields are NOT squeezed into zero-length effective descriptions
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MH. 08/01/08, East Lansing, MI 3
GICOSY to MOTERGICOSY to MOTER
GICOSY MOTER
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MH. 08/01/08, East Lansing, MI 4
Enge Enge Coefficients for the A1900Coefficients for the A1900
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MH. 08/01/08, East Lansing, MI 5
A1900 elements and focal planesA1900 elements and focal planes
Image 1
Image 2
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MH. 08/01/08, East Lansing, MI 6
Selected particlesSelected particles
particles
Fixed start parameters
Selected particles:
• ± 10 and 20 mrad horiz.
• ± 10 and 20 mrad vert.
• ± 1 and 2 % in momentum
• plus on-axis beam
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MH. 08/01/08, East Lansing, MI 7
Trajectories of selected particlesTrajectories of selected particles
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MH. 08/01/08, East Lansing, MI 8
Overlapping fringe fields: trajectoriesOverlapping fringe fields: trajectories
Multiple passes
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MH. 08/01/08, East Lansing, MI 9
Particle going through 1st fringe field, then back through a drift, and then forward through 2nd fringe field: certainly unrealistic
Overlapping fringe fields: fieldsOverlapping fringe fields: fields
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MH. 08/01/08, East Lansing, MI 10
Averaging ????Averaging ????
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MH. 08/01/08, East Lansing, MI 11
Averaging ???Averaging ???
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MH. 08/01/08, East Lansing, MI 12
Averaging ???Averaging ???
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MH. 08/01/08, East Lansing, MI 13
Trajectories for large angles …Trajectories for large angles …
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MH. 08/01/08, East Lansing, MI 14
… reveal edge effect in dipole field… reveal edge effect in dipole fieldField kind of overshooting close to the edge of the yoke
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MH. 08/01/08, East Lansing, MI 15
Final Focus in XFinal Focus in XFor the ‘original’ A1900 optics (prior to vault reconfiguration)
Focus at about z = 3548 cm
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MH. 08/01/08, East Lansing, MI 16
Final Focus in YFinal Focus in Y
Focus at about z = 3548 cm
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MH. 08/01/08, East Lansing, MI 17
Results in focal planesResults in focal planes
Image 1
Image 2
Image 3
Focal Plane
Target
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MH. 08/01/08, East Lansing, MI 18
Image 1 vs. targetImage 1 vs. target
Dispersion ?X-focus ?
Y-focus ? Angle disp.?
Image ?
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MH. 08/01/08, East Lansing, MI 19
Image 1: dispersionImage 1: dispersion
Dispersion
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MH. 08/01/08, East Lansing, MI 20
Image 1: XImage 1: X--focusfocus
X-focus
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MH. 08/01/08, East Lansing, MI 21
Image 1: YImage 1: Y--focusfocus
Y-focus: Small (y,bbb)?
GICOSY: 20 mrad → 0.3 mm
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MH. 08/01/08, East Lansing, MI 22
Image 1: angular dispersionImage 1: angular dispersion
Angular dispersion: Some (a,dd)? GICOSY: 2% → 0.8 mrad
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MH. 08/01/08, East Lansing, MI 23
Image 2: dispersionImage 2: dispersion
Dispersion
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MH. 08/01/08, East Lansing, MI 24
Image 2: YImage 2: Y--focusfocus
Y-focus: at least two terms, but small
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MH. 08/01/08, East Lansing, MI 25
Image 2: YImage 2: Y--focus (large angles)focus (large angles)
Y-focus: aberrations small also for larger angles
GICOSY, (y,bbb) only expects about twice this aberration
~ 3 mm
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MH. 08/01/08, East Lansing, MI 26
Image 3: XImage 3: X--focusfocus
X-focus: small aberrations visible
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MH. 08/01/08, East Lansing, MI 27
Image 3: angular dispersionImage 3: angular dispersion
Angular dispersion: visible aberrations
GICOSY (±2%) : (a,dd) → +4.5 mrad, (a,ddd) → 0.25 mrad
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MH. 08/01/08, East Lansing, MI 28
Focal PlaneFocal Plane
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MH. 08/01/08, East Lansing, MI 29
Focal Plane: XFocal Plane: X--focusfocus
X-focus: aberrations, but small
GICOSY (±20 mrad) : (x,aa) → -0.2 mm, (x,aaa) → ±0.06 mm
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MH. 08/01/08, East Lansing, MI 30
Focal Plane: dispersionFocal Plane: dispersion
Essentially dispersion-free
GICOSY: all (x,pn) yield < 0.5 mm
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MH. 08/01/08, East Lansing, MI 31
Focal Plane: angular dispersionFocal Plane: angular dispersion
But not fully achromatic
GICOSY (±2%) : (a,dd) → -7 mrad, (a,ddd) → ±2.6 mrad
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MH. 08/01/08, East Lansing, MI 32
Focal Plane: YFocal Plane: Y--focusfocus
1 mm
Y-focus: very slightly underfocused
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MH. 08/01/08, East Lansing, MI 33
Focal Plane: YFocal Plane: Y--focusfocus
Y-focus: for larger angles also aberrations
GICOSY (±40 mrad) : (y,b) → 6 mm, (y,bbb) → ±7.5 mm
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MH. 08/01/08, East Lansing, MI 34
Single ParticlesSingle ParticlesSo far only one non-zero coordinate per particle, now multiple:
Initial: + 20 mrad (x), + 20 mrad (y), + 1 % (dp/p)
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MH. 08/01/08, East Lansing, MI 35
Single ParticlesSingle Particles
Initial: + 20 mrad (x), + 20 mrad (y), + 1 % (dp/p)
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MH. 08/01/08, East Lansing, MI 36
Single ParticlesSingle Particles
Initial: + 40 mrad (x), ± 0 mrad (y), - 2 % (dp/p)
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MH. 08/01/08, East Lansing, MI 37
Extreme Particle: plenty aberrationsExtreme Particle: plenty aberrations
Initial: + 40 mrad (x), + 40 mrad (y), - 2 % (dp/p)
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MH. 08/01/08, East Lansing, MI 38
Extreme particle: doesn’t make it!Extreme particle: doesn’t make it!
Initial: + 40 mrad (x), + 40 mrad (y), - 2 % (dp/p)
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MH. 08/01/08, East Lansing, MI 39
A1900 vertical angle acceptanceA1900 vertical angle acceptance
Initial: 0 mrad (x), - 40 mrad (y), 0 % (dp/p)
casting some doubt about ± 40 mrad vertical angle acceptance
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MH. 08/01/08, East Lansing, MI 40
Ray tracing random particlesRay tracing random particles
Initial Phase space: ± 60 mrad (x), ± 40 mrad (y), ± 2.5 % (dp/p)
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MH. 08/01/08, East Lansing, MI 41
Ray tracing random particlesRay tracing random particles
Initial Phase space: ± 60 mrad (x), ± 40 mrad (y), ± 2.5 % (dp/p)
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MH. 08/01/08, East Lansing, MI 42
Ray tracing random particlesRay tracing random particles
Initial Phase space: ± 60 mrad (x), ± 40 mrad (y), ± 2.5 % (dp/p)
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MH. 08/01/08, East Lansing, MI 43
Ray tracing random particlesRay tracing random particles
Initial Phase space: ± 60 mrad (x), ± 40 mrad (y), ± 2.5 % (dp/p)
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Initial angular distributionsInitial angular distributions
Initial Phase space: ± 60 mrad (x), ± 40 mrad (y), ± 2.5 % (dp/p)
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A1900, XA1900, X--trajectories, againtrajectories, again
Without any non-unit ratios (±10,20 mrad, ±1,2%)
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And the same with “Std. Ratios”And the same with “Std. Ratios”
With the “standard ratios” applied to triplet 1 (same particles)
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““UntweakedUntweaked” Y focusing” Y focusing
Without any non-unit ratios (±20,40 mrad, ±1,2%)
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And the same with “Std. Ratios”And the same with “Std. Ratios”
With the “standard ratios” applied to triplet 1 (same particles)