Mar 3rd , 2014

Magnet Support(Moving stage/ KEKB floormodification)
H. YamaokaandMagnet group
1

QCS support system for KEKB

QCS support system for SuperKEKB
QCS support frame
QCS-L

FilledMoving stage
Precise flat surface floor

Concrete bridge2

Mechanical design
4000kg0.3G
4000kg
7000kgLoad conditions (Vertical dir.)Self-weight (QCS)：
Self-weigh(Supp. Frame):
Weight of magnets:

2500kg
10000kg
4000kgMagnetic force(axial dir.)Inner direction：
Outer direction:

7000kg4000kgSeismic load
0.3G in the horizontal direction

3

Static analysis
Vertical-dir.
(self-weight)

0.4mm

Axial-dir.
(Magnetic force)

0.7mm

4

Moving distance = 3.35m

Linear guide rail
H250x250
Motor
Level adjustment system5 Assembling is in progress…

6

-2m/min-Manual operation

7

KEKB concrete floor
modification

8

KEKB concrete floor modifications
L-side-Make reinforced concrete floor.
-Make precise flat floor (self-leveling).
-Mount the movable table.
R-side-Make reinforced concrete floor.
9We apply self-leveling method.
Traditional way

Self-leveling method

Set base blocks

Level adjustment
with shims.

 - Save working time.
- Improve vibration property.

10Set steel rods11

Dec.11, Fill with concrete

12

13

Dec. 07, High precision ﬂat surface ﬂoor(Self‐leveling method)14

Modal test of concrete bridge
Measurement

Vibration properties must be changed
due to the modifications.

FEM

Spring constant:
1x106N/mm

Resonant frequencies
Mode shapes
are measured and compared to FEM.
Fixed(Y)

Fixed

15

Measurement

FEM
31Hz

31Hz

63Hz
63Hz

89Hz
80Hz

16

Jan. 6,7th ,Flatness of the floor was measured.
High precision level

Laser tracker

17

Result (Measured with Laser Tracker)
Unit: mm
1500
1800

200

500

1000

000.02-0.029-0.033-0.058500-0.017-0.008-0.06-0.045-0.0451000-0.043-0.0960.011-0.021

-0.02

1500

0.008

-0.034

0.011

-0.06

-0.033

2000

0.021

-0.0110.011-0.019-0.0382500-0.018-0.005-0.008-0.074

-0.05

3000

-0.041-0.015-0.014-0.066-0.0563500-0.018-0.022-0.035-0.04-0.061

4000-0.028-0.005-0.04-0.017

-0.05

4500

-0.015-0.036-0.028-0.092-0.081

5000-0.022-0.024-0.008-0.016

-0.04

5500

-0.046-0.057-0.04-0.047-0.0556000-0.046-0.039-0.03-0.046-0.0416500-0.061-0.045-0.047-0.033-0.0457000-0.054-0.068-0.082-0.078-0.0747500-0.087-0.086-0.081-0.097-0.0868000-0.113-0.106-0.125-0.131-0.08

 Flatness is about less than 0.1mm.

18Conclusion
Present situation

At KEK @ Mar. 3rd-Modification of the floor is completed.
-Waiting to install the movable table.

At factory of fabricator;-Assembling is in progress…

Assembling in KEK, Middle of March.

19

20

34Hz
34Hz

64Hz
64Hz

Measurement

ANSYS

21

79Hz
74Hz

この点での各値~5nm<70Hz

 Measurement data is good agreement with calculation.

22

・Motor(2m/mim)・Hand operation is possible.

23Modal test

Input

Operational Modal Analysis
From Wikipedia, the free encyclopedia
Ambient modal identification, also known as
Operational Modal Analysis (OMA), aims at

OutputYZ

identifying the modal properties of a structure
based on vibration data collected when thestructure is under its operating conditions, i.e., noinitial excitation or known artificial excitation. The
modal properties of a structure include primarily theXnatural frequencies, damping ratios andmode shapes.

24