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M. Modena CERN

“CLIC magnets developments”. M. Modena CERN. Acknowledgments: CERN TE-MSC CLIC Magnets Study Team: A. Aloev , E. Solodko, P. Thonet , A. Vorozhtsov. “CLIC Project Meeting #16” CERN, Friday 13 June 2014. Outline:.

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M. Modena CERN

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  1. “CLIC magnets developments” M. Modena CERN Acknowledgments: CERN TE-MSC CLIC Magnets Study Team: A. Aloev, E. Solodko, P. Thonet, A. Vorozhtsov “CLIC Project Meeting #16” CERN, Friday 13 June 2014

  2. Outline: • A quick status on the magnet R&D advancement, (1 slide per magnet type): • Main Beam Quadrupole (MBQ) • Drive Beam Quadrupole (DBQ) • Steering correctors • QD0 • SD0 • Other studies (ILC and ATF studies) • Note: a similar status will be presented next week at IPAC14: • M. Modena et al.: “Status of CLIC Magnets Studies and R&D”, (TUPME007). 2

  3. MBQ: The last MBQ Type1 prototype procured has shown excellent machining precision on all the iron quadrants critical surfaces (±7µm). • The key point is now to study and develop a: precise;fast;robust (thinking to a semi-industrial production) design and method to assembly the 4 quadrants with the required precision. • This task is now subject of the WP 3.1 of PACMAN.The PhD student (I.Doytchinov) will be very well supported also from the academic point of view (Cranfield University – UK). References: - M. Modena et al.: “Performances of the Main Beam Quadrupole Type1 Prototypes for CLIC” MT23, Boston, US, July 2013, IEEE Transactions on Applied Superconductivity, Vol. 24, NO. 3, JUNE 2014, 4002504 - M. Modena, R. Leuxe, M. Struik: “Results on Ultra-Precise Magnet Yoke Sectors Assembly Tests”, MT23, Boston, July 2013, IEEE Transactions on Applied Superconductivity, Vol. 24, NO. 3, JUNE 2014, 9001304

  4. MBQ electromagnetic design: The design finalized for the procurement of 8 DBQ units (with Danfysik) optimizes the tight boundary conditions: space availability; field quality (on the full gradient range), and minimize power and cooling needs. • 2 units are at CERN and ready for installation in CLEX • 6 other units will be delivered in September

  5. DBQ permanent magnet design: ASTeC (Daresbury Lab.) has developed two designs that cover the needed gradient range of the Decelerator (i.e: integrated gradient from 1.2 to12.2 T ) • the 1stprototype (High Gradient) was delivered at CERN and measured (at magnetic Meas. Lab and at Metrology Lab.). • the 2ndprototype (Low Gradient) is just assembled and under functional tests. It will be delivered at CERN in the Summer to pass then full set of magnetic tests. • The R&D includes studies of the key aspects towards serie production (this is the most populated magnet family in CLIC 3 TeV with41848 units). • Future activities with ASTeC will cover new designs (based on PM) for CLIC transfer lines dipoles: -dipoles of MB RTML (Main Beam Ring Transfer line to Main Linac) -dipoles of DB TAL (Drive Beam Turn Around Loop) References: - J.A. Clarke et al: “Novel Tunable Permanent Magnet Quadrupoles For The CLIC Drive Beam”, MT23, Boston July 2013, IEEE Transactions on Applied Superconductivity, Vol. 24, NO. 3, JUNE 2014 4003205 - P. Wadhwa et al.: “Design and Measurement of a Low-energy Tunable Permanent Magnet Quadrupole Prototype”, will be presented at IPAC14 on next week (TUPRO113)

  6. Steering Correctors for MBQ: Two prototypes (for Type1 and Type4) were built at CERN. - They are not yet measured and tested (priority and resources problem within MM Section). - A critical aspect will be the functional tests with the corrector mounted on the MBQ (the correctors work at 100 Hz, and this will surely impact on the active stabilization system). - To be noted that the EM steering correction is the CLIC baseline design (CDR) but we are very confident that a more elegant and efficient solution (i.e. nano-positioning provided by the stabilization system) will be possible. - The study of this alternative (including the functional test of the steering correctors) is now subject of WP 3.3 of PACMAN (PhD student: D. Tshilumba)

  7. QD0: QD0 prototype built in 2011/2012 is now under test at LAPP (dynamic tests for stabilization R&D). Having now available at CERN an Helmholtz Coils measurement system, we have started measurements/check of the permanent magnet blocks (SmCo and NdFeB) in order to clarify some inconsistency appeared between measurements and simulation in the NdFeB blocks. Tests and simulation should proceed and be completed in the Summer. References: - M. Modena, et al., “Design, Assembly and First Measurements of a short Model for CLIC Final Focus Hybrid Quadrupole QD0”, IPAC12, New Orleans, May 2012, Conf. Proc. C1205201 (2012) pp.THPPD010. - V. Remondino: “Calibration and qualification of the Brockhaus 3D-Helmholtz coils system for permanent magnets measurements” MSC-MM Internal Note EDMS Id: 1364773, 13 March 2014.

  8. SD0: SD0 design is under finalization: • We received offers (expensive!) for the key central components (PM blocks and the 4 Permendur sectors done by EDM). We are re-evaluating the design (i.e. simplifying it from 12-blocks to 6-blocks (SmCo). • We are also considering a different solution to be implemented (super-ferric design, see next point). This will have no impact on the design (and cost) of the central components. • Anyway, before to proceed further I am also waiting confirmation on CLIC budget decision for magnets R&D program (end of June).

  9. Other studies, ILC QD0: Under the aegis of the Linear Collider Collaboration we are investigating an alternative design for the ILC QD0. The baseline is today a super-conducting (coil dominated) design. We have studied an adaptation to ILC parameters of CLIC QD0 design but also a “super-ferric” variant (i.e. same hybrid design with small superconducting coils at the place of the low current density resistive coils). Advantages in dimensions and weight are evident and one of the most interesting aspect is that the iron part is still “visible” so much more easy to be aligned and eventually stabilized. (This work will be presented next week at IPAC14: M. Modena, A. Aloev, H. Garcia, L. Gatignon, R. Tomas: “Considerations for a QD0 with Hybrid Technology in ILC”, at IPAC14, TUPME006)

  10. Other studies, QD0 for ATF at KEK: ON STANDBY, waiting for procurement decision by ATF: In 2012 we finalized the conceptual and magnetic design for a new compact QD0: It should be tunable and provide ~12.5 T/m of gradient on a 60 mm diam. bore The design would be an evolution (ex. tunability) of a prototype developed at CERN for LINAC4. Critical aspects like the stability vs. temperature, were also successfully assessed. Prototype built for LINAC4: Aperture: 45 mm, Gradient: 16 T/m

  11. Other studies, Octupoles for ATF at KEK: ON STANDBY, waiting for procurement decision by ATF: This would be an alternative solution (easier to be installed) to a new QD0: In 2013 we started to study an octupole design for ATF after Rogelio’s proposal. Two units will be needed. Requirements: wide tunability; the best possible field quality for a 20 mm aperture; stability. We have developed a conceptual design that fit the requirements and we are now waiting a possible procurement decision Global discussions between Labs Managements are ongoing …We remain positive and waiting decisions ! 

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