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CLIC DETECTOR PAC RING SHIELDING CONCEPT

CLIC DETECTOR PAC RING SHIELDING CONCEPT. 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.

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CLIC DETECTOR PAC RING SHIELDING CONCEPT

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  1. CLIC DETECTOR PAC RING SHIELDING CONCEPT Jerome Axensalva BE/OP

  2. 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. General Layout. Drawing by Nicolas Siegrist Jerome Axensalva BE/OP

  3. 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. Shielding layout. Drawings by Nicolas Siegrist Jerome Axensalva BE/OP

  4. Constraints we have around the demanded shielding:- The first 100 mm of depth of the yoke material.- 4 fixed concentric coil rings.- Cavern wall (not shown).- If any other, please specify…! Jerome Axensalva BE/OP

  5. What is required:A Moveable Shielding System Between the Coil Rings to Fill the 50 mm Gap. Shielding in extended position Shielding in retracted position Jerome Axensalva BE/OP

  6. What is proposed 1:We need a supporting system for the moveable shielding rings -> screwed sliding pins in the yoke… Shielding supporting pins Jerome Axensalva BE/OP

  7. What is proposed 2:…to guide and support the shielding rings… Shielding support Jerome Axensalva BE/OP

  8. What is Proposed 3:… and finally a translation equipment 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 shielding rings. Yoke grooving and hydraulic equipment Jerome Axensalva BE/OP

  9. 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. Shielding viewed from backward with yoke material hidden Jerome Axensalva BE/OP

  10. Manufacturing consideration:The rings are difficult to manufacture and transport in one single piece (Ø max ~ 11 m)…Areasonable solution is to split them into 3 equal sectors and re-assemble them once on the detectors. Jerome Axensalva BE/OP

  11. Test Bench:Preliminary tests are proposed on a prototype system to validate the hydraulic and sliding systems… Test bench assembly Jerome Axensalva BE/OP

  12. Test Bench:…and we also need to perform endurance tests on components: hydraulics, low friction pads, motion sensors, etc… Test bench assembly Jerome Axensalva BE/OP

  13. Test Bench:View from the bottom, grooves for hydraulic piping Test bench: grooves in the dummy shield part and hydraulic piping Jerome Axensalva BE/OP

  14. Test Bench:Hydraulic cylinders. Test budget: ~ 15.000 kCHF Jerome Axensalva BE/OP

  15. Questions: • Is this concept compatible with the yoke’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 around 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

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