Nsls ii insertion devices
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NSLS-II Insertion Devices. Toshi Tanabe George Rakowsky, John Skaritka, Steve Hulbert, Susila Ramamoothy NSLS/BNL NSLS-II Accelerator Systems Advisory Committee 2006/10/9-11. Outline. List of NSLS-II insertion devices (baseline + options) Comment on Phase Errors

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NSLS-II Insertion Devices

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Nsls ii insertion devices

NSLS-II Insertion Devices

Toshi Tanabe

George Rakowsky, John Skaritka,

Steve Hulbert, Susila Ramamoothy

NSLS/BNL

NSLS-II Accelerator Systems Advisory Committee

2006/10/9-11


Outline

Outline

  • List of NSLS-II insertion devices (baseline + options)

  • Comment on Phase Errors

  • Cryo-Permanent Magnet Undulator (CPMU) for hard X-rays

    • Cold Measurement Issues

    • New magnet and pole materials

  • Elliptically Polarized Undulator (EPU)

    • Apple-II v.s. HiSOR (SPring-8) Design

  • Permanent Magnet Damping Wiggler

  • Superconducting Wiggler (SCW)

  • Superconducting Undulator (SCU)

    • Conventional, VPU and HTS versions

  • No QPU, Figure-8, Revolver options are discussed


List of nsls ii ids

List of NSLS-II IDs


Rms phase errors

RMS Phase Errors

  • Improving the rms phase error from 3.0° to 2.0° changes the relative intensities by 86% -> 98% for harmonic 7 (D = 12% points), 81% -> 96% for harmonic 9 (D = 15% points), and 75% -> 93% for harmonic 11 (D = 18% points).

Roger Dejus


Nsls ii insertion devices

CPMU

  • Cryo-Permanent Magnet Undulator (Hara, et. al., 2004)

    • Simple Concept: NdFeB has a negative thermal coefficient of remanent field (Br) [-0.1 % / [email protected]], and of intrinsic coercivity (Hcj) [-0.5% / [email protected] ]

    • Higher field and higher radiation damage resistance simply by cooling the magnet array in lower temperature (~150K)

  • Remaining Issues

    • Cold measurement system

    • Cold shimming technique if required

  • New Material R&D

    • PrFeB magnet and Dy pole combination for operation at lower temperature than 150K


History of mini gap undulators at the nsls

History of Mini-Gap Undulators at the NSLS

Currently Installed

Proposed


X 25 mgu installed in the nsls x ray ring

X-25 MGU Installed in the NSLS X-Ray Ring


Direct gap measurement by keyence ls 7030

Direct Gap Measurement by Keyence LS-7030

Measurement accuracy of ±2mm and repeatability of ±0.15mm

Upper Array

Detector

Emitter

Lower Array


Direct gap measurement at micron resolutions

Direct Gap Measurement at Micron Resolutions

Keyence gap readings track with post temperatures

35C°

10 min

Upstream Gap

10 mm

Post temperatures

Downstream Gap

30C°


Cold measurement system

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 / pulsed wire systems are

    also in consideration


Nsls ii insertion devices

EPUs

  • Apple-II v.s. HiSOR EPU (eventually in-vacuum)

    • Apple-II : bigger tuning range, simpler structure

    • HiSOR EPU: easier shimming and more benign field profile

    • Better vacuum chamber design to reduce the radiation damage of permanent magnets maybe needed


Peak field profile comparison

Peak Field Profile Comparison

  • HiSOR

  • Apple-II

Tracking studies are needed to determine the effect

of dynamic aperture reduction due to these roll-offs.


Mpw 1 8t 15mm gap

MPW (1.8T / 15mm Gap)

  • Conventional Hybrid Design with Permendur Poles

    • Close to the limit with simple block structures

    • Reducing the gap with soft-iron poles will certainly reduce the cost


Superconducting wiggler

Superconducting Wiggler

  • NSLS-I Three Mode SCW by Oxford

    • 11 pole @ 3.0T (lu=17.6cm, gvac=19.5mm)

    • 5 pole @ 4.7T

    • 1 pole @ 5.5T

  • HTS version will be investigated


Superconducting undulator nsls proto type

Superconducting Undulator (NSLS proto type)

Bifilar SC winding APC-type NbTi with integral He gas cooling @ 4K

  • APC-type NbTi expected to run at Je=2000A/mm2

  • Cooling channel underneath the coils to ensure maximum cooling

(Ceramic) isolating spacer

Beam tube with integral cooling by He gas > 4K

Low carbon steel yoke

Yoke:

1006 Steel

Embedded He Gas Cooling Channel


Other insertion device r ds

Other Insertion Device R&Ds

  • New (In-vacuum) Gap Separation Mechanism

  • Superconducting EPU

  • High-Temperature Superconducting Undulator

    • Cryocooler capacity increases drastically with higher temperature (ex. [email protected], [email protected] by Cryomech, Inc.)

    • Splices do not create quench problem if cooled sufficiently

    • Quench propagation is on order of magnitude slower than LTS

       Simpler and cheaper protection scheme

Innercage

S. Chouhan


Summary

Summary

  • CPMU

    • Cold measurement and shimming are main remaining issues

    • New material R&Ds for further enhancement of the performance

  • SCW

    • OK for LTS

    • Higher field version / HTS version will be investigated

  • EPU

    • Apple-II or other structure to be determined after tracking study

    • Better vacuum chamber design to minimize radiation damage on magnets

    • In-vacuum EPU design will be a R&D subject

  • DW

    • Design and cost issues only

    • Possible candidate for new gap separation mechanism

  • SCU

    • Low temperature SCUs still require R&Ds

    • HTS versions are promising candidates in the future


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