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1 BROOKHAVEN SCIENCE ASSOCIATES NSLS-II Insertion Device R&Ds Toshi Tanabe George Rakowsky, John Skaritka and Susila Ramamoorthy NSLS-II Experimental Facilities.

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Presentation on theme: "1 BROOKHAVEN SCIENCE ASSOCIATES NSLS-II Insertion Device R&Ds Toshi Tanabe George Rakowsky, John Skaritka and Susila Ramamoorthy NSLS-II Experimental Facilities."— Presentation transcript:

1 1 BROOKHAVEN SCIENCE ASSOCIATES NSLS-II Insertion Device R&Ds Toshi Tanabe George Rakowsky, John Skaritka and Susila Ramamoorthy NSLS-II Experimental Facilities Advisory Committee (EFAC)

2 2 BROOKHAVEN SCIENCE ASSOCIATES Outline 1)Cryo-Permanent Magnet Undulator (CPMU) New Magnet / Pole Materials Cold Measurement System New Gap Separation Mechanism 2)In-vacuum Elliptically Polarized Undulator (IVEPU) 3)Superconducting Insertion Devices EPU High Temperature Superconductor (HTS) 4)Cold Gas Refrigeration System 5)International Collaborations 6)Undulator Laboratory in Bldg. 832

3 3 BROOKHAVEN SCIENCE ASSOCIATES IVU Remanence Coercivity 1) CPMU Cryo-Permanent Magnet Undulator (Hara, et. al, 2004) Simple Concept : NdFeB has a negative thermal coefficient of remanent field (Br) [-0.1 % / º C], and of intrinsic coercivity (Hcj) [-0.5% / º C ] PrFeB (53CR at NEOMAX) shows no spin canting at the lower temperature. However, it does not have high enough coercivity at the high temperature needed for baking.

4 4 BROOKHAVEN SCIENCE ASSOCIATES New Materials W. Swift and M. Mathur IEEE Trans. Mag. Vol.10, No.2 (1974) Bakable PrFeB Magnet High Hcj type which can withstand the baking temperature (>100 °C) Get manufacturer/university with production capability involved Crystalized Dysprosium Pole Very high saturation flux density ~ 3.5T Vanadium permendur ~ 2.3T Soft iron ~ 2.1T A few vendors identified International collaboration subject

5 5 BROOKHAVEN SCIENCE ASSOCIATES Cold Measurement System Cold In-Situ Field Measurement In-vacuum mapper with Hall probe. The postion accuracy is maintained by laser tracker and piezo controller. In-vacuum streched wire / pulse wire system are also in consideration

6 6 BROOKHAVEN SCIENCE ASSOCIATES New In-vacuum Gap Separation Mechanism Linear motors drive the outer cage. Vacuum chamber Rail

7 7 BROOKHAVEN SCIENCE ASSOCIATES 2) In-Vacuum EPUs Out-of-vacuum Device (G mag ~10mm) Apple-II : bigger tuning range, simpler structure HiSOR EPU: easier shimming and more benign field profile Apple-II HiSOR In-vacuum Helical Undulator at SP8 In-vacuum Device (G mag ~7mm)

8 8 BROOKHAVEN SCIENCE ASSOCIATES 3) Superconducting Insertion Devices Low Temperature Superconducting Undulator Different techniques are being tested all over the world Need more R&Ds such as thermal intercept designs and lead design, etc. to achieve stable operations in a ring Superconductor EPUs Various designs have been proposed Available only after the development for a linear device is established High Temperature SC Device Depends on the conductor development New type such as coated conductor and thin film available More design flexibility Once the conductor exceeds the necessary performance level, it will be very promising candidates for future IDs

9 9 BROOKHAVEN SCIENCE ASSOCIATES SC-EPUs and a HTS Undulator Sasaki Snake S. Chouhan Rossmanith HTSU by T.Tanabe

10 10 BROOKHAVEN SCIENCE ASSOCIATES 4) Cold Gas Refrigeration System Use of LHe creates many safety issues to deal with. Closed circuit He refrigerator alleviates these problems. LHe plant may not be available in the vicinity of the ID. Needs higher capacity and more reliability for NSLS-II devices (CPMUs and SCUs)

11 11 BROOKHAVEN SCIENCE ASSOCIATES Schedule st user beam New MaterialsCold MeasurementIVEPUInternational CollaborationsGas RefrigeratorSCUsUndulator Lab

12 12 BROOKHAVEN SCIENCE ASSOCIATES Summary Cold measurement system is essential for the CPMU baseline design New in-vacuum gap separation mechanism New material R&Ds for further enhancement of the CPMU performance In-vacuum EPU design will be a challenge, but it shares the many development aspects with in-vacuum gap separation mechanism. SCU R&Ds Low temperature SCUs still require R&Ds SC-EPU will be available once the technology for linear devices matures HTS versions are promising candidates in the future Circulating He gas cooling system needs to be developed International Collaborations Undulator Laboratory in Bldg. 832


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