SCU Magnetic Measurement System Design and SCU0 Measurement Results Charles L. Doose Engineering Specialist ASD/Magnet Devices DOE Lehman CD-2 Review of APS-Upgrade 4-6 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 2 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. DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December

Thanks to Some of the Contributors to the SCU0 Project DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December 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 from the APSU PDR lists the ID error tolerances that were set in See Kathy Harkay’s talk for more recent details on field errors.  Table 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. 5 DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December 2012

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

SCU magnetic measurement system design previous reviews APS Superconducting Undulator Conceptual Technical Design Review Friday, 5 February 2010 Review committee: Chair Pat Den Hartog External members Joel Fuerst, PHY/ANL Vladimir Kashikhin, FNAL Soren Prestemon, LBNL APS members Jeff Collins, AES-MED George Goeppner, AES-MOM Merrick Penicka, AES-MED (Survey) Frank Lenkszus, AES-CTL Vadim Sajaev, ASD-AOP Ju Wang, ASD-PS SCU Measurement System Design Review Thursday July 14, 2011 Review committee: Johannes Bahrdt Kathy Harkay Bob Kustom (Chair) Vadim Sajaev Isaac 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 DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December

SCU magnetic measurement system schedule DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December  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  Room temperature Hall probe and coil measurements of SCU0 were first performed in January  The measurement system was fully functional in March  Detailed magnetic measurements of SCU0 were completed in July 2012.

SCU magnetic measurement system design 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 B y and B x along the mid-plane.  Stretched Wire Rotating or Fixed Coil –Stretched wire rectangular, delta and figure 8 coils to determine static and dynamic 1 st and 2 nd field integrals. –Coils can be translated along transverse axis approximately ±1 cm to measure integrated multipole components.  Miscellaneous –Ability to measure dynamic 1 st and 2 nd field integrals, magnet coil voltages, and current during a quench. DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December

SCU magnetic measurement system design Mechanical overview 10 DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December 2012 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

SCU magnetic measurement system design Beam chamber and guide tube cross section DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December 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

SCU magnetic measurement system design Hall sensor assembly DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December 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 B y above and below the mid-plane separated by ~1mm (suggested by I. Vasserman). These sensors were calibrated by M. Abliz. The third sensor measures B x. Nominal K1 scale factor 14 T/V. B y1 BxBx 3.8 mm OD 29 mm length

SCU magnetic measurement system integral coil configuration DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December m linear stage US end of SCU0 with 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 DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December 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 stages Coil can be configured at rectangular, delta, or figure 8

SCU0 magnetic measurement results from July 2012 Hall probe data, vertical field and 1 st field integral vs longitudinal position DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December <Typical B y field with Main coil current of 500A and correction coil current of 51.7A 1 st field integral of above data>

SCU0 magnetic measurement results Hall probe data, trajectory and phase errors DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December Trajectory from previous slides data Phase errors 0.73 deg rms from previous slides data

SCU0 magnetic measurement results Hall probe data, angular flux density spectra DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December Measurement files: Fmap-SCU Fmap-SCU

SCU0 magnetic measurement results Hall probe data, B eff, K eff, and photon energy DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December B eff and K eff as a function of main coil current Fundamental photon energy (keV) as a function of main coil current

SCU0 magnetic measurement results Integral coil data 1 st Integrals as a function of x position DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December st vertical field integral as a function of transverse position 1 st horizontal field integral as a function of transverse position Integrated skew quadrupole ~114 G Tolerance 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. DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December Skew Quadrupole correction coils

SCU0 magnetic measurement results 1 st Integrals of B y and B x during a quench DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December G-cm is equivalent to 1 µRad angle 2.3 kG-cm 2 is equivalent to 1 µm offset During a quench the change of exit angle would be ~1.5 µRad in 50 ms And the change of exit offset ~4 µm 1 st B y integral ~35 G-cm p-p 1 st B x integral ~30 G-cm p-p APS-U PDR, Table QuantitySpecificationMeasured 350 G-cm30 G-cm 2100 G-cm35 G-cm Measured field integrals are an order of magnitude less than specification

SCU Magnetic Measurement System ES&H DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December  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

Summary DOE Lehman CD-2 Review of the APS Upgrade Project 4-6 December  The SCU horizontal magnetic measurement system has been fully operational since March  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 7 th 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.