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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

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
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

slide5
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]ºC], and of intrinsic coercivity (Hcj) [-0.5% / [email protected]ºC ]
    • 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
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

slide11
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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