scu magnetic measurement system design and scu0 measurement results

SCU Magnetic Measurement System Design and SCU0

Measurement Results

Charles L. DooseEngineering SpecialistASD/Magnet Devices

DOE Lehman CD-2 Review of APS-Upgrade4-6 December 2012

Outline Why do we need a Superconducting Undulator (SCU)

magnetic measurement system? Project Contributors SCU magnetic measurement system requirements and

achieved specifications Previous design reviews SCU magnetic measurement system schedule and design SCU0 magnetic measurement results ES&H Conclusion

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DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December 2012

Why do we need a SCU magnetic measurement system? SCU0, which is an R&D programmatic project, requires magnetic

measurements to verify design goals and to confirm the phase errors, multipole components, and field integrals are within the APS required tolerances. SCU1 and subsequent longer SCUs will also require magnetic measurements to confirm the magnetic field quality.

The present design will accommodate SCUs with beam chamber apertures of 7 mm and greater and magnetic lengths of up to 2.5 m.

SCUs can provide higher performance than existing PM undulators. See Y. Ivanyushenkov’s and Kathy Harkay’s talks.


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Thanks to Some of the Contributors to the SCU0 Project


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APS: Melike Abliz Neil Bartkowiak Suzy Bettenhausen Ralph Bechtold Kurt Boerste Michael Borland Tom Buffington Dana Capatina Jeff Collins Roger Dejus Boris Deriy Chuck Doose Joel Fuerst Joe Gagliano jr./sr. Efim Gluskin

Quentin Hasse Kathy Harkay Yury Ivanyushenkov Mark Jaski Matt Kasa Suk Kim Bob Kustom Jie Liu Mike Merritt Liz Moog John Terhaar Emil Trakhtenberg Vadim Sajaev Denise Skiadopoulos Isaac Vasserman Joseph Xu

Yuko Shiroyanagi Sasha Zholents APS Alignment Group

Visitors from Budker Institute, Russia: Nikolay Mezentsev Vasily Syrovatin V. Lev V. Tsukahov

Collaborators: Sasha Makarov,

Technical Division, FNAL John Pfotenhauer, UW

Madison

SCU magnetic measurement system requirements

Table 3.4-7 from the APSU PDR lists the ID error tolerances that were set in 1995. See Kathy Harkay’s talk for more recent details on field errors.

Table 3.5-10 shows required and achieved measurement resolution. The achieved measurement resolution for the integrated fields are at

most 0.4% of the ID error tolerance limit, i.e., 0.2 G-cm.

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SCU magnetic measurement system requirements cont.

Horizontal Hall probe based system to map the local horizontal and vertical fields of a short period superconducting undulator for determining magnetic field and phase errors.

System should be capable of accommodating a SCU of up to 2.4 m in length.

Rotating coil capability with reproducibility of 1st integral ~ 10 ±G-cm (actual reproducibility ~ ± 1 G-cm).

The measurement system is installed in Building 314.


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SCU magnetic measurement system design

previous reviewsAPS Superconducting UndulatorConceptual Technical Design ReviewFriday, 5 February 2010 Review committee:Chair Pat Den HartogExternal members Joel Fuerst, PHY/ANLVladimir Kashikhin, FNALSoren Prestemon, LBNL APS members Jeff Collins, AES-MEDGeorge Goeppner, AES-MOMMerrick Penicka, AES-MED (Survey)Frank Lenkszus, AES-CTLVadim Sajaev, ASD-AOPJu Wang, ASD-PS

SCU Measurement System Design ReviewThursday July 14, 2011Review committee:Johannes BahrdtKathy HarkayBob Kustom (Chair)Vadim SajaevIsaac Vasserman

This review covered the detailed design of the horizontal measurement system for superconducting undulators.

Findings from these reviews were very positive, and several of the recommendations were implemented in the design of the measurement system


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SCU magnetic measurement system schedule


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The schedule required the SCU horizontal measurement system to be installed in Building 314 and to be ready to measure SCU0 by the end of March 2012.

Room temperature Hall probe and coil measurements of SCU0 were first performed in January 2012.

The measurement system was fully functional in March 2012. Detailed magnetic measurements of SCU0 were completed in

July 2012.


as-built features Warm-sensor system based on Budker Institute's wiggler measurement system.

Scanning Hall Probe– On-the-fly Hall probe measurements (2 cm/s, z 0.2 mm, typical z range ±35

cm) to determine local field errors and phase errors.– Three sensor Hall probe (attached to carbon fiber tubing and driven by linear

stage) to measure By and Bx along the mid-plane. Stretched Wire Rotating or Fixed Coil

– Stretched wire rectangular, delta and figure 8 coils to determine static and dynamic 1st and 2nd field integrals.

– Coils can be translated along transverse axis approximately ±1 cm to measure integrated multipole components.

Miscellaneous– Ability to measure dynamic 1st and 2nd field integrals, magnet coil voltages, and

current during a quench.DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December 2012

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Mechanical overview

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• One 3.5 m travel linear stage• Three ±1 cm travel transverse linear stages• Three manual vertical stages• Two rotary stages• Warm Ti tubing installed inside cold Al beam

chamber as guide for carbon fiber Hall probe assembly


Beam chamber and guide tube cross section


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Cold (20K) Al beam chamber Warm (~300K)

Ti guiding tube

Warm (~300K) carbon fiber tube holding Hall probe or 4 mm wide Integral coil

X

Y

Vacuum

Air


Hall sensor assembly


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Three Arepoc Hall sensors and one temperature sensor mounted to a ceramic holder that is then installed in a carbon fiber tube.

Two sensors measure By above and below the mid-plane separated by ~1mm (suggested by I. Vasserman).These sensors were calibrated by M. Abliz.

The third sensor measures Bx.

Nominal K1 scale factor 14 T/V.

By1

Bx

3.8 mm OD29 mm length

SCU magnetic measurement system integral coil configuration


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3.5 m linear stageUS end of SCU0

US end of SCU0with integral coil in guide tube

Rotatable connector

DS end of SCU0; rotating and x stages and coil and Ti tube tensioners

US end showing bellows and x stage

SCU magnetic measurement system Integral coil configuration


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Upstream end rotating stage with ceramic pin to define coil width and position

Down-stream end rotating stage with ceramic pin and brass tensioning fixture

One turn integral coil supported at each end by ceramic pins with 4 mm “V” cut mounted to rotating stagesCoil can be configured at rectangular, delta, or figure 8

SCU0 magnetic measurement results from July 2012Hall probe data, vertical field and 1st field integral vs longitudinal position


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<Typical By field with Main coil current of 500A and correction coil current of 51.7A

1st field integral of above data>

SCU0 magnetic measurement resultsHall probe data, trajectory and phase errors


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Trajectory from previous slides data

Phase errors 0.73 deg rmsfrom previous slides data

SCU0 magnetic measurement resultsHall probe data, angular flux density spectra


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Measurement files:Fmap-SCU-000-0017-0005Fmap-SCU-000-0017-0015

SCU0 magnetic measurement resultsHall probe data, Beff, Keff, and photon energy


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Beff and Keff as a function of main coil current

Fundamental photon energy (keV) as a function of main coil current

SCU0 magnetic measurement resultsIntegral coil data 1st Integrals as a function of x position


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1st vertical field integral as a function of transverse position

1st horizontal field integral as a function of transverse positionIntegrated skew quadrupole ~114 GTolerance is 50 G

Note, this data includes the Earths field which is approximately -175 G-cm for the 3.5 m long coil

Concept for correction of the skew quadrupole component for SCU1

The skew quadrupole component is caused by the coil winding geometry. A simple skew quadrupole correction coil design is being studied and will be

implemented on the 1.14 meter long SCU1 magnetic structure. The correction coil will consist of two SC rectangular planar coils placed above and

below the SCU1 magnet cores. These will be wired in a quadrupole configuration and be energized by a small 20 A power supply.


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Skew Quadrupole correction coils

SCU0 magnetic measurement results1st Integrals of By and Bx during a quench


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23 G-cm is equivalent to 1 µRad angle 2.3 kG-cm2 is equivalent to 1 µm offset

During a quench the change of exit angle would be ~1.5 µRad in 50 msAnd the change of exit offset ~4 µm

1st By integral ~35 G-cm p-p

1st Bx integral~30 G-cm p-p

APS-U PDR, Table 3.5-8

Quantity Specification Measured

Bx: 350 G-cm 30 G-cm

By: 2100 G-cm 35 G-cm

Measured field integrals are an order of magnitude less than specification

SCU Magnetic Measurement System ES&H


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Integrated Safety Management System (ISMS)– APS-U Project following Argonne’s ISMS program requirements – Argonne Integrated Safety Management System (ISMS) Description recently

revised and submitted to DOE ASO• Describes framework for integrating ESH requirements with mission objectives• References Argonne LMS procedures which implement specific portions of the ISMS

ISM is practiced daily by our project team by discussing the upcoming activities and testing and determining the best course of action. All work is planned and coordinated with all the team members input.

All work performed according to ANL Environment, Safety and Health Manual https://docs.anl.gov/lms/documents/legacy/eshman/index.html

Summary


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The SCU horizontal magnetic measurement system has been fully operational since March 2012.

Magnetic measurements of SCU0 have been completed. SCU0 measured rms Phase errors are typically 1 degree or less where the

specification is 8 degrees rms. The angular flux density is near 99 % of an ideal device up to the 7th

harmonic. From measured data a quench of SCU0 should not cause a beam dump. The SCU0 magnet performed better than design specifications for all

parameters except the integrated skew quadrupole component that measured at 120 G where the tolerance is 50 G. A correction coil design is presently being studied to reduce the skew quadrupole component.

We are ready to measure SCU1 now.

scu magnetic measurement system design and scu0 measurement results

Documents

magnetic measurements

magnetic lengths

review of aps

aps upgrade project

magnetic field quality

scu0 projectdoe lehman

review committee

design goals