1. S. Tanaka (PXD mechanics session)
KEK IR status
S. Tanaka
(PXD mechanics session)

2. 12thB2GMDiscussion summary (VXD designers meeting)
The first priority of SVD designer is to solve 3rd layer's Hybrid cooling issue
VXD mechanical mockup (check for service space or assembly procedure)
The design should be finalize at 13thB2GM(2012 Nov.)
The mock-up should be shown at 14thB2GM(2013 Mar.)
The design requirement (i.e. connection with endflange)should be summarized at next SVD/PXD meeting in Sep.
KEK mockup design and production should wait until decision
The idea of ladder mount procedure is highly welcome
Tanaka have to send Step file of heavy metal to VXD designers
PXD ladder assembly will be done at MPI
Simple mount procedure on beam pipe =>good new for KEK group
The place of PXD PP at between SVD support cone and heavy metal
discussed on SVD/PXD meeting in Sep.
which is important for new installation procedure
The material selection and production procedure of SVD support structure
should decide at 14th B2GM (2013 Mar.)
Titanium option should be take care in parallel with base idea
Vienna, MPI and KEK group will start test production of CFRP cone and gluing test . (Vienna group will also study thermal stress effect)
Please keep watch the status of beam pipe production. The precision of this may cause serious situation in particular for PXD mount.
12thB2GM

3. Beam pipe, PXD and shield
9cm
Beam pipe design (outer dimension defined)
PXD design has finished
Shield design will finalized after SVD design
PXD PP position is still open question
One option is outside of End-flange (9cm between endflange and QCS)
Another is between SVD and shield <- Baseline(Start designing)
Discussion of BP+PXD assembly table should start.
Does the clearance between SVD and BP+PXD+HM require 1.5-2mm(OK!) on VXD assembly?
Path of dry air(or Nitrogen) ?
Include SVD volume? YES
flow on SVDvolume will be
more slow speed
M.Ritter (12th B2GM)

4. Beam pipe status

5. Beam pipe preparation status
TWO beam pipe(not three) will be produced (because of budget
and commissioning schedule)
Items
Study
Beam pipe design
Almost done (minor change is still acceptable)
Beryllium part production
done
Titanium part production
Design has done
IP Cooling OK
Mechanical tolerance estimation
OK (by weight, temperature stress)
Crotched part production procedure
Production period and cost estimation
Connectivity test (Be-Ti)
Connectivity test (Ti-Ta)
Ridge shape optimization
To be finished soon (Implementing to MC)
PXD mount
To be solved (space for sensor)
Au plating inside IP chamber
Now on preparation 5

6. Gold plating of IP inner pipe
"Tohokaken" produced sputtering chamber for IP inner tube.
The first trial of sputtering test will be adopted for dummy tubes with cupper plating process (next month).

7. Crotch part production
Ta block
Drilling inside structure
Cutting by electrical discharge machining
Brazing or EBW

8. Crotch part production
Test was done with small piece of Tantalum block.
The R=2 cm half-tube shape is done.
The ridge machining is done.
Final production will start after
decision of inner shape by BG
estimation

9. Beam outlet part
Ridge part(beam inlet)
The surface is slightly rough at the deepest point. We discussed this is because the ball end milling is adapted in vertical direction. If we apply some angle to the "mill", this may not happen.
The roughness is still acceptable in view point of accelerator and vacuum. The roughness may be OK for the gold-plating. The gold plating will be done to reduce wall current heat. Decision of gold plating is made if heat is not acceptable. Thick gold plating costs a lot. Decision should be made quantitatively.

10. Outer pipe production
Ti block
Be pipe

11. IP outer pipe The brazing tool : chamber is constrained using springs.
This setup had problem on horizontal constraint.

12. IP outer pipe

13. Production design
Measured
Design
Error
Concentricity
parallelism

14. Measured data for Titanium part

15. Concentricity check

16. IP outer pipe production
Brazing is done.
Precision is measured.
0. Visual inspection: OK.
Outer surface: Photos. Inner surface: OK with fiber scope (no photos this time).
1. Length: 0.3 mm longer than design.
This error already existed before brazing. Length change due to brazing is very limited.
2. Axis offset is 0.9 mm where target was less than 0.1 mm.
3. Parallelism is 0.2 mm where target was less than 0.1 mm.
4, Vacuum test: OK
Discussion: The method of error measurement exaggerate the error. The position/orientation of the beryllium pipe against two flanges should be measured.
We did not decide to use this pipe for BelleII IP chamber because of error.
IP chamber production schedule may be loosened in order to validate each
production process( expecting half year).

17. Support block for PXD
The mechanical error of IP chamber should be compensated with PXD support block design.
KEK group should provide the detail measured data of beam pipe and Tscharlie will design PXD support block.

18. Inner pipe production Drilling inside next step Ta+Ti by HIP
Ti+Ta by HIP
Be pipe
Ta-Ti-Be-Ti-Ta

19. Connection of inner and outer pipes
Ti-Ti connection by EBW

20. Combining each sub-parts
Brazing
Ti flange
On this fiscal year, we will make tools for EBW and try test production to check precision
Ta-Ta connection by EBW

21. BEAST setup

22. BEASTII setup
BEASTII setup on vacuum scrubbing
(no solenoid, no QCS)

23. BEAST group considering to use DOCK space on BEASTII operation
PXD and SVD dock designed by Tscharlie

24. PXD DOCK SPACE, phase t2
Phase t2 most constrained in terms of space. Use PXD DOCK space?
Both TPCs and BGOs could easily fit in DOCK space
Probably very good location for TPCs (see next page)
Probably not location good for BGO  Radiative Bhabha events blocked by shielding
Is there other PXD cabling space available that can be used for BGOs?
S.Vahsen

25. Balcony for MARCO
One additional support frame
to sustain MARCO weight

26. Schedule (IR mechanics)
2012 (preparation for VXD mock-up)
From the end of 2012
Starting VXD mock-up assembly
Mechanics check -> installation test , Cooling test
Beam pipe production(for BEASTII)
Freezing the mechanics design
(including cooling system, cabling, monitors)
2013 (final VXD design)
Beam pipe production
2014
SVD Ladder mount start (SVD) (2014 Sep.)
End of > BEASTII
2015
Starting VXD assembly(Aug-Sep) (CR test ) and installation 26

27. Thanks

28. Other subjects discussed on IR community

29. SuperKEKB beam energy @12GeV
Beam energy correlation
@ 12 GeV
Power supply of QC1 is restricted the Beam energy balance

30. Beam pipe offset for LER around QCS

31. Weakening corrector dipoles of QC1/2 by vertically shifting the IP off axis
LER Arc x mm IP mm
2012/8/6の資料　
Belle-II
solenoid axis
/ldata/SuperKEKB/Lattice/Developer/LER/sler_1672_3_f.sad
K.Oide

32. Weakening corrector dipoles of QC1/2 by vertically shifting the IP off axis
Proposal x IP
QC1P, QC2P
-1 mm
LER Arc
？ mm
Belle-II
solenoid axis
QC1E, QC2E
/ldata/SuperKEKB/Lattice/Developer/LER/sler_1672_3_f.sad
K.Oide

33. This shift will be allocated around bellows pipe
Y. Ohnishi

34. Reinforcement of QCS stage (to reduce vibration of QCS)
H.Yamaoka
(K.Kanazawa)

35. QCS support bridge 20m Fixed Material Concrete E=30GPa Density=2.3
Weight of Concrete shield
300tons
QCS support bridge
Weight of magnets
20tons
20m
Fixed
Material
Concrete
E=30GPa
Density=2.3
Damping= 2%
Concrete shield
300 tons
KEKB floor
B4 floor

36. 2012
1985

37. give to raise a characteristic value. （target value>100Hz)
Response of QCS tip area for 2 kind of vibration from floor（Vertical）
Input(two pattern)
床振動に対するここでのP.S.D.応答の計算
P.S.D
Integrated
Amplitude becomes below half if vibration by a KEKB floor is the same level as B4 floor.
 Resonance with QCS is avoided by strengthening bridge construction which
give to raise a characteristic value. （target value>100Hz)

38. Reinforcement of QCS stage
Fixed
20m
Now
New structure:design is ongoing
Adding shield：
300tons
QCS magnet：20tons
１．溝を埋めた
2.　(例)Adding beam
　鋼製 ロ500x500

39. Response of KEKBfloor for vibration from B4 floor（（Vertical）
Pos.2
Pos.1
Without
With B4

40. Without reinforcement With
28Hz
33Hz
51Hz
58Hz
71Hz
79Hz

41. Proposal of the photon scattering measurement on a Au coated surface
Ken-ichi Kanazawa
Takuya Ishibashi

42. Motivation
Design of the central beam pipe in the Belle II detector of Super KEKB
The central beryllium tube is coated with Au to stop photons with energy less than 10 keV.
How photons scatter on Au coated surface?
The inner surface of the pipe for the incoming beam has ridges to keep scattered photon on the surface from hitting the central beryllium pipe.
The problem of the edge scattering.
Ideal boundary
Scattered photon
Unwanted photons due to the edge scattering
Incoming photon
Ridge

43. Experiment
Measure the spatial distribution of scattered photon from the flat surface.
If possible quantitatively.
5 degree
Incoming 9 keV photon
Measure photons originate from the edge scattering
Are there any photons in this region?
If possible quantitatively.
Incoming 9 keV photon