1. Summary FD Support System
Andrea Jeremy: FD Support
Tatsuya Kume: Shintake Monitor
David Urner: MONALISA

2. Andrea JEREMIE N.Geffroy, B.Bolzon, G.Gaillard
FD support
Andrea JEREMIE
N.Geffroy, B.Bolzon, G.Gaillard

3. SUMMARY: Vibrations transmissibility study
First eigenfrequency measured:
With no masses: 74Hz (Q=12)
Masses of 1400Kg: 46Hz (Q=9)
First eigenfrequency simulated:
With no masses: 56Hz
Masses of 1400Kg: 26Hz
 Simulations done: gives a good idea of eigenfrequency evolution with masses and boundary conditions
Other table transfer function peaks: Due to the fact that supports are not fixed to the table and to the ground

4. Current QD0 configuration
QD0 + mover
beam
300mm (from Ghyslain’s drawing)
1200mm
Height to compensate!
T-plate
260mm
610mm
50mm
30mm
Idea for 260mm support is to have a bottom plate clamped to the bloc with some possibility of adjusting the position with big screws

5. Position adjustment
Height adjustment with shims =>so slightly shorter than 260mm
3 to 6 of such devices
Adjust position with screw
Table: flat surface

6. FD configuration (T.Okugi’s presentation)
Table=2400
IP=>
SBPM
QC3
FFTB
2.13
S3.00
SF1FF
QF1FF
100
450.1
200
180
SD0FF
QD0FF
76.2
785
380
2630
Sweeping
Honda
Shintake
S-band BPM slightly outside table on a “light” Sextupole=> how will the S-band BPM be supported?
Does this BPM need to be supported?

7. Mount stabilization for Shintake monitor-6 5th ATF2 Project meeting December 20, 2007
T. Kume, Y. Honda, and T. Tauchi High Energy Accelerator Research Organization (KEK) T. Suehara, H. Yoda, M. Oroku, T. Yamanaka and Y. Kamiya The univ. of Tokyo T. Sanuki Tohoku Univ.

8. Specifications expected for new table support
~10nm of amplitude for incoherent vibration with floor
>Use steal honeycomb core (<Al), thicker (110mm->250mm)
>Highly ridged mount on floor without any insulator
±5mm of height adjustable range with accuracy of ±1mm
>Shim between table mount and floor
±2.5mm of horizontal position adjustable range perpendicular to beam with accuracy of ±1mm
>Slide sheet between vertical table and horizontal table

9. Shintake monitor mount-side view assuming distance between end face of CLIC table and FF magnet is 20 mm, distance between end face of FF magnet and IP is 1000 mm
Downstream　⇔　Upstream

10. Shintake monitor mount-top view assuming beam goes center of CLIC table

11. David Urner ATF2 Meeting Dec 19 2007
MONALISA Update
David Urner
ATF2 Meeting Dec

12. CSM (Compact Straightness Monitor)
10cm
5cm
100cm
6D position transferred from left to right
breaking of symmetries is important
Preliminary simulation results of CSM Resolution:
sy:10nm
distance meter resolution: 1nm
Positional change of optics components with respect to each other: 1nm That’s the challenge.

13. Multi-fibre read out (compact launch)
FFI: Fixed Frequency Interferometry (OPD 400mm)
s=4.5nm
Displacement / nm
Time (hours)
Displacement / mm
Fixed frequency laser (FFI)
Compact Launch: 25x25x15mm
Test shown here with moving mirror
First stationary mirror test :
resolution 5 nm demonstrated
to be improved with vaccuum
and laser frequency stabilisation

14. Frequency stabilisation
Frequency standard: 87Rb D2 line at 780 nm
Simplified Schematic:
Need 20 kHz stability for 1nm over distances of 10m.
NPL done ~kHz.

15. Multi-fibre read out (compact launch)
FSI:Frequency Scanning Interferometry (OPD 400mm)
s=750nm
s=70nm
Add box to reduce air turbulence
s=750nm
Same interferometer can be used for FSI
Better resolution by just covering
interferometer with box
- expect to do even better in vacuum!

16. Overview of Current Design
Plan View
End View
Elevation