SPring-8 (1436 m) since 1997

XFEL (700 m)From 2011

Hiroaki Kimura1,3 ） , Masafumi Yamashita2 ） , Yusuke Maeda2 ） , Yoshifumi Tsukamoto2 ） , Noriyoshi Azumi1 ） , Sakuo Matsui1 ） , Noritaka Kumagai1 ）

Installation and Alignment of Installation and Alignment of RIKEN-XFEL at SPring-8RIKEN-XFEL at SPring-8

1)RIKEN/SPring-8, 2)SPring-8 Service Co., Ltd. 3)JASRI/SPring-8

BL29XULFrom 2000

Outline

1. Overview of our XFEL2. Strategy of alignment 3. Vertical direction measurement4. Horizontal direction measurement5. Alignment of C-, S- band accelerator Section6. Summary

2

RIKEN’s XFEL: SPring-8 Compact SASE Source (SCSS) Concept

Short Period Undulator Lower Beam Energy

In-Vacuum Undulator : u= 18 mm, K=1.9, x < 1 Å E= 8 GeV,

8 GeV, C-band 35 MV/m 230 m

Short Accelerator LengthHigh Gradient Accelerator

Accelerator length of 400 m

EmbankmentWeathering bedrock

BedrockReplacement by excavation with crusher stone

33

Concrete pillar Diameter: 1.5 or 1.6m Total :139 Length :19-52m (Ave. 30m) Subsidence ～　２ 0mm/10years

Bedrock or Replacement with crusher stone.

Subsidence < 2mm/10years

Schematic view of XFEL

Mar. 2009: Building completedApr. 2009: Installation startedOct. 2010: Aging of accelerator startsFeb. 2011: Beam commissioning starts

Our situations under the alignment work1. Requested Accuracy of V&H directions

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Accelerator Sec.: ±0.1mm(BPM, Q-Mag), ±0.15mm(Accel. Str.) , Smooth/400m

Light Source Sec. : ±0.1mm/110m(Undulator Sec.)

Final goal : 30μm/110m and 5μm/12m at Undulator Section

→ X-ray Based Alignment and Beam Based Alignment

2. The period for installation & alignment work is 18 months.

3. Displacement of the floor is not small. ～ 2mm/year

4. 1 time / 1 ～ 2 months Survey is needed. → Half week for the entire survey, Compact survey network

Girders of Undulators and Q&BPMs are equipped remote positioning system.

Strategy of Alignment

Survey of Monuments

5

Vertical direction: Digital Level

Horizontal direction: Survey Network

Entirety:

Undulator Hall:

・ Reference monuments were mounted at intervals of about 30m as a beam line reference for alignment at 700mm horizontal off-set position.

Total: 32, Accel. Tunnel:14, U. Hall for BL3:9 for BL1: 9

・ Accelerator components and stone tables were aligned using a laser tracker, its coordinate system was made from two nearby monuments and an inner level.

By total station using only monuments that queues up straight

It takes 3 days to survey for all monuments.

By laser tracker using monuments of BL3, BL1, and additional points on the Wall

→ Permanent monuments have the advantage that the alignment work is started at once in an arbitrary place and a measurement accuracy improvement.

(Beam direction: Distance Meter)

Instrumentation

・ Laser Tracker: API T3 & OT

・ Digital Level: Trimble DiNi 0.3

・ Total Station: Leica TDA 5005

・ Optical Plummets: Leica NL

・ Distance Meter: Kern ME5000

・ Optical Level: Wild N3, Nikon AS-2

・ Laser Range Meter: HILTI PD32

・ Multi-Directional Lasers: TaJIma AL-KYRJ

　　

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Base level line of XFEL

400m200m

Height Difference -0.81mm ～

30m

16μrad

Def. Angle @Switching Mag. 20μrad

Deflecting angle～ 5 μrad

Geoid levelStraight lineStraight line

Accelerator Sec.Undulator Sec.FE & Exp.

Monument

Laser Tracker,TDA 5005

Optical level

ME5000

Digital Level

・ Accel. Tunnel:14, U. Hall for BL3:9 for BL1: 9

・ Reference point: Center of 1.5 inch ball on the target plate

・ Horizontal position could be moved on the floor by using a plummet.

Vertical Direction

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History of Floor subsidence from Aug. 2008

By Digital Level

Accelerator Building Area The shape of the subsidence data is very similar to that of embankment. It is as same as the case of BL29XUL(not pillar structure) Recent subsidence 0.15mm/month @ Z= 200m (BL29XUL 8mm/year@BL29XUL )

Light Source Building Area Recent subsidence is small.

Subsidence of top surface of concrete pillar

Observed subsidence is agree with that of floor.

9Bedrock

Embankment

Vertical Direction By Digital Level

10

History of Floor subsidence from Aug. 2008

Difference of Monument from ideal line

Reference point

+1mm +2mm +1mm

Adjusted before installation

Difference of monument position is within 1mm.

Horizontal direction: Survey network

・ by TS using ATR

Entirety (640m)

Light Source Building (240m)

・ 23 control points only monuments that queues up straight.・ 4 measuring positions

・ Accuracy of ATR:1”

→ Estimated error of network: ± 0.5mm

・ 28 control points ・ Monuments for BL3: 9 ・ Monuments for BL1: 9 ・ Additional points on the Wall :10 size: 240m × 8 m・ 9 measuring positions

・ by Laser Tracker

・ Accuracy of LT :1”, 20μm+0.2ppm

→ Estimated error of network: ±0.2mm

Measuring Position Control Point

BL3

BL1

IDIDIDIDIDID

Horizontal Direction By Total StationSurvey network

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Difference of Monument from ideal line

Accelerator BuildingLight Source Building

We defined two fixed points. Building curves, swells with the south.

South

North

Entirety consists of three straight line.

-10 ～ +15 mm /7years@BL29XUL

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We defined two fixed points at both side of Und. section.

Difference of monument position in Undulator section is within 0.1mm in both directions.

Displacement at Light Source Building

Undulator-Section

Vertical

Horizontal

Digital level data (res. 10μm) is good agreement with HLS data(res. 0.1μm ） .

By Digital Level

By LT survey network

Alignment of Accelerating Structure

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Using the digital level and the total station

Fiducials

Adjustment Unit

Alignment Unit

CCR

Using the laser tracker

C & S-band accelerator section ( ～ 400m) 136 accelerating structures 24 stone tables for Q-magnet and BPM.

Check of Alignment

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Most part is aligned smoothly.

Position of Accelerator Components

Diff

eren

ce(m

m)

Diff

eren

ce(m

m)

C-band C-band S-band

Vertical

Horizontal

・ There are some jump at several parts.

Strategy of alignment: We adopted permanent monuments and compact survey network.

Summary

Acknowledgements・ IHI Inspection & Instrumentation Co., ltd.・ Pasco Corp., especially Dr. Mishima

Difference of reference monuments from ideal line: At Accelerator building: Vertical: 1mm Horizonta: 2mm At Light Source building: 0.2mm, 0.1mm in ID section

Displacement of floor: It was within our expectation. → It is important to know the history of the ground displacement for the new facility. We should take care of the displacement of floor in the future

Alignment of components: Most component is good. Some smoothing is needed before beam commissioning in next February.

Displacement of BL29XUL in 7years @IWAA2008

-60.0

-50.0

-40.0

-30.0

-20.0

-10.0

0.0

10.0

0 10 20 30 40 50 60

-20.0

-10.0

0.0

10.0

20.0

0 10 20 30 40 50 60

Vac. Sta.＃

Alt

i.(m

)

50m

Top　ViewSideView

Original Altitude Line

Level(

mm

)La

tera

l(m

m) North

South

Vac. Sta.＃

Level: Subsidence at #51: 54mm (8mm / year)Lateral: Displacement : ～ － 5 ～ +15mm 17

→ Accelerator section of XFEL building (located at #35 - #64)

Ground displacement depends on that of embankment.

： GNSS others ：TS