1 beam pipe and vxd mockup status at kek s.tanaka (kek) svd/pxd meeting
TRANSCRIPT
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Beam pipe and VXD mockup status at KEK
S.Tanaka (KEK)SVD/PXD meeting
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Beam pipe preparation status
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 OK
Cost estimation of materials OK (1 set has ordered)
Connectivity test (Be-Ti) OK (should be validate before this March)
Connectivity test (Ti-Ta) OK(should be validate before this March)
Ridge shape optimization To be finished soon
PXD mount To be solved (space for sensor)
Au plating inside IP chamber Start discussing with company
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2011 Optimizing production procedure(writing rough sketch note for each procedure) for first prototype.– Service space allocation will be decided– Validate the technology of connectivity for each materials.2012From 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 SVD Ladder mount start (SVD) (2013 Sep.) Beam pipe production 2014 End of 2014 -> BEAST Beam pipe production2015 Starting VXD assembly(Aug-Sep) (CR test ) and installation
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Schedule (IR mechanics)
When is the time limit to produce of IR subparts?
IR mechanics schedule
• We have still spare time to modify beam pipe design
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Beam pipe production
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How to optimize the IR mechanics design?
Subject Requirement to optimize
IP chamber Be part lowest atomic number metal
Ti part coefficient of linear thermal expansion difference with Be (similar number is better)
Au coating Protect SR from final focus magnet
Crotch part Material (Tantalum)
Cost, heavy material as shield , experience using as vacuum chamber, BG simulation
Outer shape Production procedure, Space requirement from PXD,SVD
Inner shape Beam optics, SR shielding, HOM power
Shield Heavy metal Cost, upper limit from CDC weight request, BG simulation, Space request from PXD, SVD
Technology choice of connectivity on each part
HIP = Hot Isostatic Pressing
•A test for Be-Ti brazing and Ti-Ta HIP is now undergoing.•They are not special technologies.•Ti is adopted instead of stainless steel to reduce the stress (see the following slides).
WL: 210W (Ta) WL: 140 W (Ta)
WL: 190 W (Ta)SRQ: ~ 50 WSRB: 100 W
WL: 70 W (Au)SRQ: few W
WL: 270 W (Ta)SRQ: ? WSRB: 130 W
10~20 m
VXD design
Otherwise BG shower reach PXD directly
Add heavy metal here
Add more if not too heavy
6mm gap for cabling
gap for Cooling pipe/BPM cable
2011/10/17ver.Base design are not changed
Request by BG simulation
PXD request
Latest space request(Dec.) from PXD:PXD group requested to make a space for Kapton flex and Omega.We may cut the beam pipe for Kapton flex, however those region is critical toshield BG for PXD or SVD. We have enough time to discuss before production
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Design work has been done.The mock-ups are in KEK and MPI.
Beam pipe and QCS mock-up
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Au coating inside of IP chamber
• The company, which performed Au coating, changed their policy not to use Be. Then we ask another company to produce dedicated sputtering system.
• Next fiscal year, we will try Au sputtering study using SUS pipe with CLEOII data.
12Pipe diameter was 4cm
Beam pipe (Crotch part)
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The crotch part (Tantalum) is divided into three pieces.The inner pipe structure has made by drilling with 5-axis stage.After then, those three pieces are joined by welding. Drilling test : finished Material for 1st version has ordered
Ridge shape to protect SR(x-ray) from final focus magnet
Beam pipe production
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Ti small pipe is connected with HIP (Ti-Ta)
IP chamber(inner) is connected with welding (Ti-Ti)
Outer pipe of IP chamber and inner pipe are connected by EBW
Vertex detector Assembly and installation
Koike(BP,SVD design, install jigs)Kohriki(BP,CDC,SVD design)Kanazawa(BP,KEKB machine)Sato(SVD mounting)
Simple Installation test
• Almost all mock-up components will be produced before the end of Mar.(including CDC inner cylinder and CDC inner structure mock-up)
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We will start from this April
End flange
• SVD flange should take care for SVD cables and pipes.• BP flange should take care for BP, PXD and shield support• This two components will be assembles, independently.
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Beam pipe is keep by this shield structureSUS mock up will be produced in a few weeks.The cost of HM ver, is around 6000$.
The shield is fixed by the end-flange
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Beam pipe endflange
SVD outer structure mock-up
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SVD end flange
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The holes for cabling are just implementation of SVD2
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Beam pipe is connected at here PXD PP space is not optimized on this ver.
SVD support flange
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VXD installation jigs
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Assembly at KEK
Combined with QCS at Tsukuba hall
SVD support ring
Vertex detector installation
The sled guide is fixed on backward side
Vertex detector installation
How to connect with backward sled
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Adapting support ring Connected with sled
Vertex detector installation
Guide pin to fix the VXD angle
Vertex detector installation
Temporal support guide
The VXD weight is keep by support guide and QCS
Vertex detector installation
This guide ring keep weight
Vertex detector installation
The backward weight is shift to this guide
SVD cover should not attach to another structure on installation at every time
Vertex detector installation
Remove backward sled
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How to fix at SVD backward
34VXD detector is fixed at backward endfor x, y, z axis
Remove sled
Remove support ring and adopt a bracketconnecting with CDC inner structure
SVD support ring at forward region
Guide roller to keep weight of SVD
Positioning guide pin(CDC side)
Release control rod after install(QC cryostat side)
The VXD center position is arranged by those rollers.Forward region is fixed only for x and y axis
Vertex detector installation
Vertex detector installation
Summary of KEK group statusKEK group are preparing mock ups for simple installation test.
Beam pipe (+PXD mount): done (KEK and MPI) QCS structure: done Heavy metal shield:
SVD end flange (for SVD and beam pipe each): SVD support ring: done SVD outer cover: CDC inner structure(between QCS and CDC):
CDC inner cylinder: All of parts will be produced before the end of this March.Then we will start studying installation procedure. After checking each parts, we will produce
one more set of Heavy metal shield(by Al) and beam pipe end flange, then send those to MPI.
(PXD assemble test (cables or cooling?) can be started from around this May or June at MPI.)• After our installation test, those parts may use for mechanics check or cooling test(Where
and how?).• The final mock up (the target is the end of this year) will be produced including feedback o
r requirements from cooling or mechanics community.
cont'd
• We will produce one beam pipe for BEASTII to validate whole production procedure in next fiscal year.
• After installation test, KEK mechanics group should concentrate into mainly SVD mechanics (Ladder mounting table or assembly jigs).
(Of course, Mechanics request from PXD is always welcome.)
Belle rotation
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Belle Rotation
Machine group decided to rotateBelle detector.This work will be on next fiscal year.
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Interference
Interference
Exchange piping
What we should take care?
Belle alignment pin position should be shift
Belle Rotation• Organizer: I.Nakamura, J.Haba• There are two candidate companies
interested in Belle rotation work.• One option is exchanging rail with
rotated angle at interaction region.• Another option is exchange all trucks
with shifted position.
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Discussion and requested items
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SVD/PXD dock position
• Please prepare the space request for Dock (SVD and PXD for each).– Also list of cables connectors with dimension for inlet and outlet
• On next B2GM well discuss about space allocation. 45
Service space allocation on QC cryostat
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I propose to have a special meeting about allocation of each service on next B2GM( Nov). -> summarize the list of parts in next B2GM
Related subjects:CO2 cooling tubes(SVD, PXD)SVD cablesPXD air cooling tubePXD cablesBP cooling tubesMonitor cables
Space:250cm2
Space requirement from QCS •Ouchi-san (QCS group leader) propose to put iron shield between QCS and Belle structure (Blue region) PXD/SVD dock space seems to be still free for this requirement
SVD mechanics discussion
Conflict region• The structure is cut at the center and a projection is made.
– Hatched region is the cut surface.– Regions with a blue circle is interfering.
• 1, 4, 5: Layer3 ladder and PXD.• 2, 6: Layer 3 ladder support and PXD• 3: Layer 3 hybrid and Layer 4 ribs.• 7, 8, 9 : The gap between CFRP cone and Beam pipe is narrow for the PXD cables. (The
top-view is narrowest… though).• 8: CFRP cone is interfering with the PXD patch panel. (we do not know the patch panel
shape is optimized or not.) • 7-9: The CFRP shape has been changed. The previous shape (shown in yellow) was
compatible with PXD design.
1 Feb. 2012 Toru Tsuboyama49
Discussion (Tanaka)There are two important milestones: 1, VXD mechanics mock-up production(end of this year)2, SVD ladder mounting (starting the end of next year)Then I asked Tsuboyama-san to set more detail schedule (also time of no return). i.e (including my questions, but some items may already be solved) A, when the design and production of mounting table should be finalized? B, Ladder mount test for each layer (+ thermal stress test?) should be finished before mo
ck-up productionC, Cooling test of hybrid with endring(+CO2 system?)How to manage to thermal connection between hybrid and endring?D, Until when, we should solve the interference between SVD(3rd) andPXD, or SVD(3) and SVD(4)etc.
SVD Milestone(Tsuboyama)
• Many subjects seem to be jammed on second quarter of 2012• To encourage those study effectively, man power should be concentrated
in one or two places to discuss in detail.
First step to solve the issues• The main subject of KEK IR group shift the stage of beam pipe design into helping S
VD mechanics work.– Mockup production– Some test to select materials– Ladder mount table design– Final SVD structure production
• In order to encourage sharing work with KEK group or other groups, SVD group prepare "Problem note" which describes (like weekly report):– Name of issue– responsible person– requirements to solve the issue– The time limit– concerning with other subjects (i.e. physics impact on ladder position) etc.
• We start discussion with SVD EVO meeting about this project and will discuss in detail at next B2GM (dedicated session concerning mechanics problems)
VXD assembly procedure
BKUP
Beam pipe have been already produced(KEK and MPI)
Heavy metal shield
SVD end flange
Beam pipe is connected with this bracket
Small Heavy metal shield(which keep by beam pipe)
SVD structure
Connection bracket of SVD halves