Jerome Axensalva BEOP 16122011 MDI meeting 1 Introduction 1 At its both ends the CLIC detectors must be shielded to avoid radiation leaks in the experimental cavern this can be achieved by filling the gap between the detector and the cavern walls with dedicated material ID: 300063
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Slide1
CLIC DETECTOR PAC RING SHIELDING CONCEPT
Jerome Axensalva BE/OP
16/12/2011 MDI meeting
1Slide2
Introduction 1:
At its both ends, the CLIC detectors must be shielded to avoid radiation leaks in the experimental cavern, this can be achieved by filling the gap between the detector and the cavern walls with dedicated material.
Jerome
Axensalva
BE/OP
General Layout. Drawing by Nicolas
Siegrist
16/12/2011 MDI meeting
2Slide3
Introduction 2:
To allow the detectors to be moved in and out the cavern and to insure the maximum tightness against radiations (no gap between the cavern wall and the detectors), it is foreseen that this radiation shielding can be extended and retracted.
Jerome
Axensalva
BE/OP
Shielding layout. Drawings by Nicolas
Siegrist
16/12/2011 MDI meeting
3Slide4
Constraints we have around the demanded shielding:
- The f
irst 100 mm of depth of the yoke material.- 4 fixed concentric
c
oil rings.
- Cavern wall (not shown).
- If any other, please specify…!
Jerome Axensalva BE/OP
16/12/2011 MDI meeting
4Slide5
What is required
:A Moveable Shielding System Between the Coil Rings to Fill the 50 mm Gap.
Jerome Axensalva BE/OP
16/12/2011 MDI meeting
5
Shielding in extended position
Shielding in retracted positionSlide6
What is proposed 1:
We need a supporting system for the moveable shielding
rings -> screwed sliding pins in the yoke…
Jerome
Axensalva
BE/OP
16/12/2011 MDI meeting
6
Shielding supporting pinsSlide7
What is
proposed 2:
…to guide and support the shielding rings…
Jerome Axensalva BE/OP
16/12/2011 MDI meeting
7
Shielding supportSlide8
What is Proposed 3:
… and finally a translation e
quipment to perform the 50 mm In and Out stroke -> double effect hydraulic cylinders. ! Note, that, at this point, grooving's in the yoke are needed to run the hydraulic piping to the inner s
hielding
r
ings.
Jerome Axensalva BE/OP
16/12/2011 MDI meeting
8
Yoke grooving and hydraulic equipmentSlide9
What is Proposed 4:
Note that the shielding rings are also grooved to house the hydraulic cylinders. Low friction material is in place at the interface between the sliding pins and the shield to minimize the risk of jamming.
Jerome Axensalva BE/OP
16/12/2011 MDI meeting
9
Shielding viewed from backward with yoke material hidden Slide10
Manufacturing consideration:
The rings are difficult to manufacture and transport in
one single piece
(Ø max ~ 11 m)…
A
reasonable solution is to split them into 3 equal sectors and re-assemble them once on the
detectors.Jerome Axensalva BE/OP
16/12/2011 MDI meeting
10Slide11
Test Bench:
Preliminary tests are proposed on a prototype system to validate the hydraulic and sliding systems…
Jerome Axensalva BE/OP
16/12/2011 MDI meeting
11
Test bench assemblySlide12
Test Bench:
…and we also need to perform endurance tests on components: hydraulics, low friction pads, motion sensors, etc…
Jerome Axensalva BE/OP
16/12/2011 MDI meeting
12
Test bench assemblySlide13
Test Bench:
View from the bottom, grooves for hydraulic piping
Jerome Axensalva BE/OP
16/12/2011 MDI meeting
13
Test bench: grooves in the dummy shield part and hydraulic pipingSlide14
Test Bench:
Hydraulic cylinders.
Jerome Axensalva BE/OP
16/12/2011 MDI meeting
14
Test budget: ~ 15.000
kCHFSlide15
Questions:
Is this concept compatible with the
y
oke’s magnetic field (Threads, Grooves, Piping fixes, … ) ?
Do we really have 100 mm of the yoke’s material available ?
Can we anticipate a clearance between the fixed coils rings and the moveable shield rings of 5 mm ?
Need to evaluate the stress and deformations of the yoke a
round the sliding pins threads -> need to know the exact yoke material.Radiation levels compatible with the hydraulic components ? (piston rings of the hydraulic cylinders are made of synthetic material).
Failure mode(s) ? Redundancy ?Seismic constraints ? Cavern wall movements transmitted to the detectors ? (hydraulic circuits opened/relieved or not during operation) ? …
Jerome Axensalva BE/OP
16/12/2011 MDI meeting
15