First Investigations of the ATF2 optics from the UK

1
First Investigations of the ATF2 optics from the
UK

• Deepa Angal-Kalinin
• James Jones
• Daresbury Laboratory, UK
• 11th December, 2004

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• First discussions to participate in the ATF2
  Final focus tests at the ILCWS-WG4, KEK.
• Study of various optics versions
• Extraction line FF S. Kuroda
• Extraction line FF NLC like FF
• MAD decks from obtained from SLAC
• Reproduced optics results with MAD, BETA
  (J.Payet, Saclay)
• Tracking using DIMAD, TRACY2
• Preliminary investigations of the tolerances for
  these two optics versions

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Existing ATF extraction line final focus
(Kuroda version) Beam optics with BETA
At IP bx,y 13.5, 0.1 mm hx0.072 rad
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Kuroda version
Chromaticities
xycorrected
xyuncorrected
How local is local correction?
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Existing ATF extraction line final focus
(Kuroda version)
Vertical phase space at IP for sE0.1
Tracking with BETA
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Existing ATF extraction line final focus
(Kuroda version)
Bandwidth with DIMAD tracking
Tracked beam size for sE0.0 sx0 3.81mm, sy0
32.67 nm Tracked beam size for sE0.1 sx0
3.86mm, sy0 34.54 nm
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Existing ATF extraction line NLC like final
focus Beam optics with BETA
At IP bx,y 4, 0.1 mm hx0.14 rad
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NLC like FF
Chromaticities
xycorrected
xyuncorrected
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Existing ATF extraction line NLC like final
focus
Vertical phase space at IP for sE0.1
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Existing ATF extraction line NLC like final
focus
Bandwidth with DIMAD tracking
Tracked beam size for sE0.0 sx0 2.042 mm,
sy0 32.03 nm Tracked beam size for sE0.1
sx0 2.059 mm, sy0 32.04 nm
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Synoptic layout of Kuroda version Final
H-angle -0.216 rad
Other version Final H-angle -0.037 rad,
Synoptic layout of other version Final H-angle
-0.037 rad
What are the layout constraints?
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First estimates of tolerances on quadrupoles and
sextupoles
Kuroda version
NLC like version
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Kuroda version
NLC like version
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Kuroda version
NLC like version
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Kuroda version
NLC like version
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Tolerances on sextupole strengths 1 change in
one sextupole strength at a time. Beam tracking
with DIMAD for d0.1
Kuroda version
NLC like version
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Work Plan

• Understand layout constraints.
• Evaluate the implications of available beam data
  in the extraction line for ATF2.
• Study the tolerances for different optics
  versions of the extraction line final focus
• Studies of the tuning procedures and tuning knobs
• Compare with ILC like lattice correspondence of
  the knobs
• Scaling of optics to higher energies?
• Specific contribution to be discussed at the
  ATF2 meeting on 5th January.