The SPEAR3 Upgrade Project at SLAC

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The SPEAR3 Upgrade Project at SLAC

• Catherine Le Cocq, Brian Fuss, Michael Gaydosh
• Alignment Engineering Group
• SLAC

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SPEAR History

• 1972 Commissioning as a 2.4 GeV colliding beam
  facility.
• 1974 Upgrade to 4 GeV.
• 1991 Completion of a dedicated electron
  injector.SPEAR2 operates routinely at 2.3 GeV as
  a synchrotron radiation source.
• IWAA97 Re-Visiting SPEAR After 25 Years poster
  by M. Pietryka and all.
• 1997 Initial upgrade proposal.
• 1999 Start of SPEAR3 upgrade project.
• 2004 3 GeV 100 mA operations.

SLAC-SSRL-SPEAR 3 dedication event of January 29,
2004 The project was completed three months
ahead of schedule, and within its 58M budget.
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SPEAR3 Goals

• 3 GeV injection energy (increase from current 2.3
  GeV).
• 18 nm-radian beam emittance (reduction from 160
  nm-radian).
• 100 mA stored beam initially (same as SPEAR 2)
  with future increases towards 500 mA.

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SPEAR3 Lattice

• 18 magnet girders
• 14 standard cells
• 4 matching cells
• 18 straight sections
• 12 are 3.1 m
• 4 are 4.7 m
• 2 are 7.6 m
• 234.126 m storage-ring circumference

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Standard Cell Part 1
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Standard Cell Part 2
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Standard Cell Part 3
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SPEAR3 Magnets Summary

• 36 gradient dipoles
• 28 full-length and 8 3/4 lenghth
• 94 quadrupoles
• 4 different lengths 0.60, 0.50, 0.35 and 0.2 m
• 72 sextupoles
• 2 different lengths 0.25 and 0.21 m
• 72 dipole correctors
• 2 injection dipoles
• 2 injection quadrupoles
• 1 septum magnet

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SPEAR3 Beamlines
The 7 Insertion Devices beamlines stayed in the
same position. The 4 bend magnets beamlines had
to be moved. Here are their SPEAR3
characteristics with respect to the center of the
upstream straight.
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SPEAR3 Timeline

• Network 0
• April SPEAR2 removal
• May to mid June Floor construction
• June 13 to 19 New monuments
• Network 1
• June 26 July 3 Mark templates
• Network 2
• July 18 August 1 Support plates
• August to November Installation
• Network 3
• November 17 to 23 Final alignment
• December Commissioning
• 2004 Network

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Network 0 Description
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Network 0 Composition

• Booster TC2002 Survey 9/2001
• BTS TC2002 Survey 3/2002
• Building 130 Tracker Survey 7/2002
• SSRL Tracker Survey 9/2002
• SPEAR Ring Tracker Survey 11/2002
• SSRL BL0 TC2002 Survey 2/2003

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From SPEAR2 To SPEAR3
SPEAR2 Z offset 90000 m X offset 70000 m Y
offset 2000 m H O 0.0 m 22 floor SPxxx3D
SPEAR3 Z offset 6000 m X offset 3000 m
Y offset 500 m H O 75.791 m 38 floor
SMxxFx
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Network 1

• Purpose Give values to the new SPEAR3 monuments.
• Description
• 166 points
• 121 ring monuments including 34 new floor and 4
  old floor
• 45 SSRL and BTS monuments
• 46 laser tracker stations
• 611 triplet observations
• Distances 30 µm
• Horizontal angles 50 µm / D
• Vertical angles 50 µm / D
• 144 height differences 50 µm
• Comment
• sigma a posteriori 0.628621 (distance 0.859524,
  horizontal angle 0.450801, vertical angle
  0.563869, height difference 0.782653)
• Weighted datum

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Network 2

• Purpose Check the new floor stability before the
  alignment of the support plates.
• Description
• 152 points
• 121 ring monuments
• 31 SSRL and BTS monuments
• 47 laser tracker stations
• 676 triplet observations
• Distances 30 µm
• Horizontal angles 40 µm / D
• Vertical angles 50 µm / D
• 123 height differences 50 µm
• Comment
• sigma a posteriori 0.825995 (distance 0.832926,
  horizontal angle 0.900147, vertical angle
  0.671085, height difference 0.967139)
• Free datum

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Network 3

• Purpose Assign new values to the SPEAR3
  monuments before fine tuning all necessary
  magnets and vacuum chambers.
• Description
• 368 points
• 122 ring monuments 38 floor, 33 aisle, 50 wall
  and 1 ceiling
• 45 SSRL monuments
• 201 magnet TB
• 40 laser tracker stations
• 636 triplet observations
• Distances 40 µm
• Horizontal angles 40 µm / D
• Vertical angles 50 µm / D
• 303 height differences 60 µm
• Comment
• sigma a posteriori 1.046304 (distance 0.891794,
  horizontal angle 0.802313, vertical angle
  1.206194, height difference 1.245124)
• Mixed datum with further 3-parameter
  transformation

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Datum Controlling Points
HRLN025
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First Conclusion

• December 11, 2003 first complete turn of an
  injected electron bunch around the ring.
• By December 15, 2003 the RF system was
  operational and SPEAR 3 started accumulating beam
  up to 2 mA.
• January 22, 2004 the stored current reached 100
  mA (maximum current allowed for operation this
  year).
• March 8, 2004 BL 9 was opened with first users
  March 15.
• By end of March 2004 BL 10, BL 11, BL 6 and BL 5
  were opened and ready for users.

Extract from the SPEAR 3 Upgrade Project
Close-out Report from April 2004 Measurements
of beam line parameters indicated that the SPEAR
3 optical performance goals were achieved.
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2004 Network

• Purpose Map the whole ring as part as the 2004
  Summer/Fall downtime.
• Description
• 950 points
• 143 monuments 37 floor, 32 aisle, 45 wall, 1
  ceiling, 11 others and 17 SSRL points used for
  height only.
• 807 magnet TBs
• 44 laser tracker stations
• 1809 triplet observations
• Distances 40 µm
• Horizontal angles 50 µm / D
• Vertical angles 50 µm / D
• 270 height differences 50 µm
• Comment
• sigma a posteriori 0.938286 (distance 1.287779,
  horizontal angle 0.825724, vertical angle
  0.589023, height difference 0.996919)
• Mixed datum, offset between the 2 trackers

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Floor Monuments ChangesNovember 2003 October
2004
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Floor Monuments ChangesJuly 2003- November 2003
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Network Weak Spot
BL11 ID
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Magnet X as-built
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Magnet Y as-built
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Final Conclusion
Next beam to beamlines will be Monday, October
18, at 600AM