The SPEAR3 Upgrade Project at SLAC

Catherine Le Cocq, Brian Fuss, Michael GaydoshAlignment Engineering Group

SLAC

10/03/2004 IWAA2004 2

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.”

10/03/2004 IWAA2004 3

10/03/2004 IWAA2004 4

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.

10/03/2004 IWAA2004 5

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

10/03/2004 IWAA2004 6

Standard Cell Part 1

10/03/2004 IWAA2004 7

Standard Cell Part 2

10/03/2004 IWAA2004 8

Standard Cell Part 3

10/03/2004 IWAA2004 9

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

10/03/2004 IWAA2004 10

SPEAR3 Beamlines

α in radian x in mm z in mm

BL 1 -0.160000 -105.686 3951.16

BL 2 -0.162375 -108.738 3969.94

BL 3 -0.162375 -108.738 3969.94

BL 8 -0.158910 -104.298 3942.52

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.

10/03/2004 IWAA2004 11

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

10/03/2004 IWAA2004 12

Network 0 Description

Number of Points 330

Number of Stations 173

Number of Triplets 1356

Number of Height Differences

400

10/03/2004 IWAA2004 13

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

10/03/2004 IWAA2004 14

From SPEAR2 To SPEAR3

Z

X

Z

X

SPEAR3

Z offset = 6000 m X offset = 3000 m Y offset = 500 m H O = 75.791 m

38 floor SMxxFx

SPEAR2

Z offset = 90000 m X offset = 70000 m Y offset = 2000 m H O = 0.0 m

22 floor SPxxx3D

10/03/2004 IWAA2004 15

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

10/03/2004 IWAA2004 16

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

10/03/2004 IWAA2004 17

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

10/03/2004 IWAA2004 18

Datum Controlling Points

HRLN025

HRLS010

HRLS090

HRLS100 HRLS105

HBL8N10

SM14F5 SM05F5

10/03/2004 IWAA2004 19

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.”

10/03/2004 IWAA2004 20

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

10/03/2004 IWAA2004 21

Floor Monuments ChangesNovember 2003 – October 2004

10/03/2004 IWAA2004 22

Floor Monuments ChangesJuly 2003- November 2003

10/03/2004 IWAA2004 23

Network Weak Spot

BL11ID

10/03/2004 IWAA2004 24

Magnet X as-built

-0.030

-0.020

-0.010

0.000

0.010

0.020

0.030

0.0 50.0 100.0 150.0 200.0 250.0

Z Distance (meters)

X P

osi

tio

n (

inc

he

s)

Quads Bends Other Re Map

10/03/2004 IWAA2004 25

Magnet Y as-built

-0.030

-0.020

-0.010

0.000

0.010

0.020

0.030

0.0 50.0 100.0 150.0 200.0 250.0

Z distance (meters)

Y P

osi

tio

n (

inc

he

s)

Quads Bends Other Re Map

10/03/2004 IWAA2004 26

Final Conclusion

Map Z inch X inch Y inch

mean 0.001 -0.004 0.001

std 0.013 0.011 0.005

Re-Map Z inch X inch Y inch

mean 0.001 0.001 0.001

std 0.012 0.007 0.005

Quad & Bend Z inch X inch Y inch

mean 0.000 0.000 0.000

std 0.013 0.006 0.005

Next beam to beamlines will be Monday, October 18, at 6:00AM