Overall of magnet measurement systems at NSRRC C. S. Hwang, NSRRC, Hsinchu, Taiwan

Transcription

1 Overall of magnet measurement systems at NSRRC C. S. Hwang, NSRRC, Hsinchu, Taiwan IMMW 17, Catalonia (Spain) 19 September 2011

2 Outline Status of 3 GeV TPS project Overview of magnet Lab. Measurement systems Hall probe measurement systems Magnetic field calibration system Rotating-coil measurement system Search-coil measurement system Pulse wire system Vacuum in-situ field measurement 3-D Helmholtz coil system Summary 2

3 Major Milestones of TPS project June 2005 Oct Dec May 2008 June 2008 Dec Dec Feb June 2012 Dec TPS Proposal to Government Lattice (circ m) approved by BOT TPS final approval by Legislative Yuan EPA approval; site plan completed Accelerator Design Book (DRAFT) issued TPS budget (Civil + Accelerator + BL) lock in Contract out of the civil construction Ground Break Civil construction completed Installation completed & commissioning Open to users

4 TPS and TLS at NSRRC site TLS TPS

5 TPS lattice parameters DBA lattice Circumference C (m) Energy E (GeV) 3.0 Natural emittance ε x0 (nm-rad) 1.6 Straight sections (m) 12 (x6) + 7 (x18) Revolution period (ns) Revolution frequency (khz) Radiofrequency (MHz) Harmonic number h 864 Energy loss per turn (dipole) (MeV) Betatron tune ν x /ν y /13.28 Momentum compaction (α 1, α 2 ) , Natural energy spread σ E Damping partition J x /J y /J s / 1.0 / Damping time τ x /τ y /τ s (ms) / / 6.08 Natural chromaticity ξ x /ξ y -75 / -26 Dipole bending radius ρ(m)

6 Progressive status of TPS construction

7 Civil construction of TPS site

8 Civil construction schedule Inside tunnel Bridge Roof of tunnel The civil construction has been delayed half year due to the ground issue. 8

9 Insertion devices in Phase I

10 Three sections double minimum βy for ID Flux (Photons/s/mrad/0.1%bw/0.5A) EPU48-6.5m EPU46 EPU48 IU22-2m IU22-3m BM EPU46 IU22-2m Bending Magnet IU22-6m Brilliance (Photons/s/0.1%bw/mm 2 /mr 2 /0.5A) EPU48-6.5m EPU48 IU22-2m IU22-3m EPU46 BM IU22-2m EPU46 Bending magnet IU22-6m Photon Energy (ev) Photon Energy (ev)

11 Design of Dipole, Quadrupole and Sextupole in SR S1 Four types of QP lamination shape Three types of SP lamination shapes7 A-type B-type Extended type H-type DP lamination shape Cutting type C-type 11 Standard type

12 Magnet construction BSL fabricates storage ring & booster ring magnets. Half part of prototype of Dipole, Quadrupole, and Sextupole are completed. Multipole error of SR magnet can be within specification but BR magnet is out of spec. Magnet field center will be adjusted by shim block and control within 10 µm. Most of mechanical precision is within 20 µm. Construction schedule has been delayed half year.

13 Layout of Vacuum system IG3 SGV2 Two 14 m long vacuum chamber of the whole 24 sectors has been completed. The aluminum chamber was fabricated and welding in local company & NSRRC. IG4 Construction is on time. IG5 IG6 BPM1 S3 BPM2 S4 B1 BPM3 BPM4 S5 BPM5 B2 SGV1 TMP2 TMP3 BPM6 BPM7 TMP1 IP1 NEG1 NEG2 IP2 NEG3 NEG4 IP3 NEG5 TMP4 IP4 NEG6 NEG7 NEG8 NEG9 IP5 TMP5 IP6 NEG10 TMP6

14 Vacuum chamber Superconducting Cavity Dipole

15 Storage Ring Girder System Design 1/6 ring symmetry section girders configuration One girder section(1/24) with magnets and vacuum system One girder section

16 Girder construction and alignment Girder is constructed in an automatic alignment system. Alignment depend on the PSD with laser system. Girder has been mass production in Taiwan and on time delivery.

17 Distribution of cryogenic system

18 Cryogenic system fabrication turbine warmer Flexible transfer line Cold box dewar

19 Cryogenic system arrived at NSRRC Recovery oil removal module Recovery compressor Mail oil removal module Mail compressor Dryer Components are delivered too early. It is waiting for commissioning

20 Selection of RF Cavity - KEKB SRF Module installed at KEKB (508 MHz) and BECP-II/IHEP (500 MHz) Performance Power handling > 300 kw Q ext tunable Highly reliable at high power Superconducting Damped Cavity for KEKB T. Furuya GATE VALVE INPUT COUPLER HOM DAMPER ( SBP) DOOR KNOB TRANSFORMER LHe FREQUENCY TUNER HOM DAMPER (LBP) GATE VALVE Nb CAVITY N2 SHIELD ION PUMP m

21 Successful commissioning of the linac injection system Cooling plate of RWG phase shifter First completed components of the TPS project.

22 Consoles and Servers Intranet EPICS/OPI PC/Linux File and Name Server, Gateway, Archivers, Beam Physics Server (Modeling System), Display Managers, Database Server, Alarm Server, AP Server, Boot Server, Monitoring Services, Storage Server etc. Router EPICS IOC (Input Output Controller) Private Ethernet cpci EPICS IOCs Signal Conditioning Field Devices (Power Supply, Motion Controller, LXI Instruments, etc.) Control Ethernet Beamline Network, Network Attached EPICS Devices (e.g. EPICS Oscilloscope, etc.) Timing Miscellaneous EPICS IOCs Standard cpci EPICS IOCs - Intel CPU/Linux (fully preemptive kernel ) - High volume I/O - High speed serial connection (GbE, etc.) PLC-IOC Miscellaneous EPICS IOCs Safety Type - Pentium/XScale/ARM/PPC Linux - Soft real-time system System - RS-232/422/485 Devices - CCD camera server - PLC (safety type system) - Bunch-by-bunch feedback system interface - Special applications

23 Measurement system Hall probe (bench) Overview of magnet Lab. Measurement dimension Purpose Note 6 m ID and EPU Pulley driven by DC motor 5.4 m Wiggle, Undulator & EPU Linear motor with air bearing 1.5 m For Lattice magnet Soak in LHe 0.6 m Wiggle, Undulator & EPU For ID and lattice magnet 2 m For Lattice magnet Mechanical precision 20µm Rotating coil 840 QM and SM-storage ring NMR ESR Search coil 570 QM and SM-boost ring T mt WireOD=0.12mm, 30turns Wire OD=0.05mm 30turns Hall sensor calibration Kicker and septum Stretch wire - Insertion Devices Long loop coil 5-axes Insertion Devices

24 2m-long Hall probe bench TPS SR-dipole 2m-long probe Specificat -ion 3-Axis & three angle adjustment Moving rang : 200 * 60* 30 cm Stepping motor 2m-long bench Precision Pitch, Yaw, Raw: 0.1 mrad Z-axis Position: 15 µm X & Y-axis position:: 10 µm Optical scalar is used for distance measurement and was calibrated by laser encoder. 2m-long Hall probe aligned with Hall Probe= T NMR= T Purpose Dipole : Linear, Curve (1) Sensor Quadruple : Linear, Circular (2) Sextuple : Linear, Circular Corrector : Linear ID : On-fly Hall probe with High precision 0.005% C. S. Hwang, et al., "High-Precision Harmonic Magnetic-Field Measurement and Analysis Using a Fixed Angle Hall Probe", Rev. Sci. Instrum., 65(8), (1994) C.S. Hwang, F.Y. Lin, P.K. Tseng, A PC based real-time Hall probe automatic measurement system for magnetic fields, IEEE Trans. on Instrum. and Meas, Vol. 48, NO. 4, (1999).

25 6m-long Hall probe bench for ID Specificati -ons precision 6m granite-bench 3-Axis 7 two angle adjustment Moving range : 590*20 * 20 cm Optical Linear encoder Pulley driven by DC motor (only for on-fly) Pitch, Yaw, Raw: 0.1 mrad Z-axis Position: 25 µm X & Y-axis position:: 10 µm Pulley Optical sensor for reference point & for limit switch. Optical scalar is used for distance measurement that has been calibrated by laser encoder Purpose Sensor Wiggle U10 prototype EPU prototype EPU56 One or two Hall probe with high precision 0.01% C. S. Hwang, et al.,, September," Advance field measuremen method with three orthogonal Hall probe for an Elliptically Polarizing Undulator ", J. Synchrotron Rad. 5, (1998)

26 5.4m-long Hall probe bench for ID 2-axis probe EPU46 5.4m-long bench Pitch < ±0.15 mrad Yaw < ±0.15 mrad Roll < ±0.15 mrad Horizontal and vertical straightness < ±12.5 µm Perpendicularity between each axis mrad Peak field standard deviation 0.23G for Bx, 0.21G for By

27 1.5m-long Hall probe bench Superconducting dipole 1.5m-Hall bench Five degree of freedom- three translation and two rotation. A HTS superconducting dipole was measured by this system.

28 Magnetic field calibration system Standard magnet (Dipole, ~1.6T) Calibration probe NMR probe and/or ESR probe The uniformity of standard magnet ~ 0.5G/6cm (A and B) 6cm The calibration sensor and NMR (ESR) sensor in the same plane. (yellow line) Temperature control ~ ±0.25 o C A B

29 Cryogenic field measurement system FRP fan Hall probe motor & track Al fan FRP screw rod FRP track Al frame Mini-Hall probe Test Dewall FRP & Al track Magnet gap = 5.6mm Mini-Hall probe Al track SU15 array

30 Cryogenic Hall probe design Mini-Hall probe Dimension/ Action area (mm) Control current lead (mm) Magnetic field range (T) Temperat ure range (K) Sensiti vity (mv/t) Linearity error at 4.2K, B=0-5T (%) Probe (hollow) HHP 5*7*1/0.1*0.1 OD= >20 <1.5 Glue expansion rate E-5 K -1 Package hall probe material E-5 K -1 (ex: Ceramic, Steel, glass) Holder Probe Sensor Sensor and holder Material of Hall probe and holder ~ Stainless Steel (SS316)

31 Rotating coil measurement system Storage-ring magnet measurement system Booster-ring magnet measurement system Vertical offset (mm) Horizontal offset (mm) Normalized multipoles (*E-4) reproducibility < < < 0.1 reinstall reproducibility n=2 is quadrupole term, n=3 is sextupole term < < n=2, < 0.3 n>2, < 0.1

32 Rotating coil measurement units FRP support Printer circuit coil (Half circle) (3 turns for normal) (150/300 turns for bucking) Main shaft J. C. Jan, C. S. Hwang, J. W. Chen, C. H. Chang, T. C. Fan and F. Y. Lin, DESIGN OF A PRECISE UNIT FOR THE ROTATING COIL MEASUREMENT SYSTEM, Proceedings of PAC07, Albuquerque, New Mexico, USA. Parameter Nm (turns) Nb (turns) r1 (mm) r2 (mm) r3 (mm) r4 (mm) Measurement length (mm) SR-Normal- QM/SM QM-Bucking SM-Bucking BR-Normal- QM/SM

33 Rotating coil design & fabrication Normal coil Normal coil PCB-BasePad Insulation Copper r1 Layer1 Layer2 Layer3 Layer mm 2mm±0.05 Bucking coil r3 r1 a b r4 r2 Bucking coil Main coil Main coil (150 turns in 1mm groove) Bucking coil (300 turns in 1.4 mm groove)

34 RCS repeatability testing Normalized multipoles Repeat: SR_QM_S, G200, V6, I180A a2/b1 Index (n) Reinstall-1024pts-10a Reinstall-1024pts-10b Reinstall-1024pts-10c Reinstall-1024pts-10d Reinstall-1024pts-10e Horizontal offset (mm) Vertical offset (mm) Repeat-SR_QM_S Number of measurements Three factors should be considered if 10 µm precision of field center is required: The temperature of measurement laboratory should be controlled within ±0.5 o C. The coil temperature variation also keep within ± 2.5 o C. The high resolution of rotary encoder and the digital leveling meter to decide exact skew quadrupole (in Q-magnet) & sextupole (in S-magnet) components

35 Precision of magnet re-installed ˪ F, SR-QM-S, =0.2E-4 Normalized multipoles (*E-4) assembly1 assembly2 assembly3 assembly4 assembly Index (n) Vertical offset (mm) Horizontal offset (mm) Q10, Torque 500Kgf*cm Number of assembly

36 RCS repeatability testing after re-assembly Normalized multipoles ˪ F, SR-QM-S =3.1E-4 =0.3E-4 Reinstall-1024pts-2a Reinstall-1024pts-3a Reinstall-1024pts-4a Reinstall-1024pts-5a Reinstall-1024pts-6a Reinstall-1024pts-7a Reinstall-1024pts-8a Reinstall-1024pts-9a Reinstall-1024pts-10a This precision include the reassembly of RCS system and magnet Opp. side - reinstallation: SR_QM_S, G200, V6, I180A a2/b Index (n) Systematic error check & test: 1.The magnet was moved everywhere on the longitudinal axis on the bench. 2.The magnet was inversed 180 o. 3.Rotatory encoder with pulses & a high precision digital angle meter on coil is necessary to have a resolution better than 0.1 mrad. Vertical offset (mm) Horizontal offset (mm) Number of reinstallation

37 Stretch wire for ID measurement ì ì Bydz'dz (G Ecm 2 ) % ( ì ì Bydz'dz) % ( ì Bydz) X-axis (mm) ì Bydz (G Ecm) First integral Second integral C. S. Hwang, C.H. Hong, F.Y. Lin and S.L. Yang, "Stretch-wire system for the integral magnetic field measurement, Nucl. Instrum. Meth. A 467 (2001)

38 Long loop coil for accelerator magnet measurement PC-586 Step Motor Control Card PC-STEP-4A-CL Step Motor Control Card PC-STEP-4A-CL AT-GPIB Board DIO Board PC-DIO24 PDS15 X-X Z-Z PDS15 Y-Y R-R Integrator PDI-5025 Reset External Trig Low Pass Filter by Circuit X-X Z-Z Motors Y-Y R-R Motors Stretched Wire Signal Optical Scalar Divider by Circuit C.S. Hwang, F.Y. Lin, T. C. Fan, Integral magnetic field measurement using an automatic fast long-loop-flip coil system, IEEE Trans. on Instrum. and Meas., Vol. 52, NO. 3, (2003) C. S. Hwang, C.H. Hong, F.Y. Lin and S.L. Yang, "Stretch-wire system for the integral magnetic field measurement, Nucl. Instrum. Meth. A 467 (2001)

39 Helmholtz coil system. z m z m α x α y = Automatic measurement for the three magnet dipole moment of permanent magnet. m y y m = m x x + m y y + m z z x (a) m x α x = tan -1 ( m x m z ) k m z θ zk,k θ xi,k θ yj,k S N m = m x 2 + my 2 + mz 2 m y α y = tan -1 ( m y ) j m z m x cos θ xi,k + m y cos θ yj,k + m z cos θ zk,k (b) m x i M k = m k = m x x k + m y y k + m z z k

40 Helmholtz coil system C. S. Hwang, et al."a Highly Automatic Measurement System for Three-Orthogonal Magnetic Moment of the Permanent Magnet block, Rev. Sci. Instrum. 67(4), (1996)

41 Accuracy of Helmholtz coil Component (Unit) (x,y,z) Block direction (-x,-y,z) (x,-y,-z) (-x,y,-z) m z ( T ) m y ( T ) m x ( T ) Replacing the different direction of the magnet on the holder to survey the absolute angle error and the main component deviation of the block magnetic moment of the measurement system.

42 Long-loop coil measurement system for pulse magnet AC Septum AC Septum Long-loop coil Long-loop coil Long-loop coil Print-circuit board for the wire with various shape to match magnet.

43 Field measurement results

44 Positioning method of Quadrupole & Sextupole Horizontal reference Vertical reference Horizontal reference Vertical reference The positioning precision of this method is within few µm. A PSD with laser is used to double check the system position.

45 Position shimming method of Quadrupole & Sextupole

46 Positioning method of SR-DM -z Type I -z Type II +z +y +z +z +x Two reference plates are for defining the horizontal position and four reference plates are for defining vertical position. 45 degree clamper was used to push magnet to touch reference plane and fixed by the torque range tool. The positioning precision of this method is also within few µm.

47 SR prototype Quadrupole-9 Mutipoles Spec. Measurement (*E-4), ±0.2E-4 at 180 A Normalized at 25 mm Bn/B1 (*E-4) 1 st Bn/B1 (*E-4) 2 nd Bn/B1 (*E-4) 3 rd Bn/B1 (*E-4) 1 st Normal T/m^(n-1) 1 st Skew T/m^(n-1) a2/b1 ± ± E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E+22 Vertical offset (mm) Horizontal offset

48 SR prototype Quadrupole-1 Mutipoles Spec. Measurement (*E-4), ±0.2E-4 at 180 A Normalized at 25 mm Bn/B1 (*E-4) 1 st Bn/B1 (*E-4) 2 nd Bn/B1 (*E-4) 3 rd Bn/B1 (*E-4) 1 st Normal T/m^(n-1) 1 st Skew T/m^(n-1) a2/b1 ± ± E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E+21 Vertical offset (mm) Horizontal offset (mm)

49 SR prototype Sextupole-2 Mutipoles Spec. Measurement (*E-4), ±0.2E-4 Normalized at 25 mm Bn/B2 (*E-4) 1 st Bn/B2 (*E-4) 2 nd Bn/B2 (*E-4) 3 rd Bn/B2 (*E-4) 1 st Normal T/m^(n-1) 1 st Skew T/m^(n-1) a1/b a3/b E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E+21 Vertical offset (mm) Horizontal offset (mm)

50 SR prototype Sextupole-3 (profile error) Mutipoles Spec. Measurement (*E-4), ±0.2E-4 at 150 A Normalized at 25 mm Bn/B1 (*E-4) 1 st Bn/B1 (*E-4) 2 nd Bn/B1 (*E-4) 3 rd Bn/B1 (*E-4) 1 st Normal T/m^(n-1) 1 st Skew T/m^(n-1) a1/b a3/b E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E+21 Vertical offset (mm) Vertical offset (mm)

51 BR prototype pure Quadrupole magnet Mutipoles Spec. Measurement (*E-4), ±0.2E-4 at 104 A Normalized at 15 mm Bn/B1 (*E-4) 1 st Bn/B1 (*E-4) 2 nd Bn/B1 (*E-4) 3 rd Bn/B1 (*E-4) 1 st Normal T/m^(n-1) 1 st Skew T/m^(n-1) b2/b E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E+32 Vertical offset (mm) Horizontaloffset (mm)

52 BR prototype Sextupole magnet Mutipoles Spec. Measurement (*E-4), ±0.2E-4 at 7.3 A Normalized at 15 mm Bn/B1 (*E-4) 1 st Bn/B1 (*E-4) 2 nd Bn/B1 (*E-4) 3 rd Bn/B1 (*E-4) 1 st Normal T/m^(n-1) 1 st Skew T/m^(n-1) E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E+30 Vertical offset (mm) Horizontal offset (mm)

53 Dipole (T) Multipoles distribution of Q-magnet along Z-axis BSL-Q1 and Q10-Normal term Q10 Q1 Quadrupole (T/m) Sexturpole (T/m^2) Octupole (T/m^3) Dectupole (T/m^4) pole (T/m^5) Z (mm)

54 Quadrupole (T/m) Multipoles distribution of Q-magnet along Z-axis Octupole (T/m^3) BSL-Q1 and Q10-Skew term Q10 Q Dectupole (T/m^4) Sexturpole (T/m^2) pole (T/m^5) pole (T/m^6) Z (mm) Exact Skew quadrupole term can be obtained after the angle calibration of Hall probe. 54

55 In-situ magnetic field measurement system (IMMS) Purpose : Check magnetic performance of in-vacuum undulators Design goals : - Measure the magnetic field inside the vacuum chamber without contaminating the chamber. - The accuracy of Hall probe positions in transverse and vertical axes are less than 30 µm. - The measurement time of 3m undulator is less than 10 minutes. Two major parts : Optical positioning system, Hall probe transferring system. Status : All components are almost getting ready, and we are assembling them now. Future work : Control program development, measurement data analysis software development, undulator prototype magnetic field measurement.

56 IMMS optical positioning system PSD Focusing lens or spatial filter Beam splitter Beam expander Laser Carrier Iris Cube corner Mirror Laser scale Breadboard Function : Detect the position of Hall probe and feed back to transferring system.

57 IMMS optical component assembly Beam expander Laser Piezo motor controller Mirror Beam splitter Position sensitive device Breadboard

58 IMMS Position & control system Galil controller XY stage XY stage Driver box This system is just under development. It will be finished before the end of this year and test in the in-vacuum undulator in next year..

59 Pulse Wire Method Pulley Damper Reference Magnet Undulator Magnet Weight Optical detector Wire Wire Pulse generator Supporter

60 A comparison between Pulse wire and Hall probe measurement Z position [m] st Integral Field [Volt] traceback HallMeas Time[sec] st Integral Field [Gauss-cm]

61 2 nd integral field by pulse wire nd Integral Field Measurement of Pulse Wire Method 4 Otical signal [Volt] w48 w50 Pulse Reduction of amplitude Wire diameter = 0.250mm Pulse Duration = 1/freq. x duty cycle = 1/0.6Hz x 1% = Sec Pulse amplitude from fun. generator = 4V, offset = 2V Burst count = 1, burst period = 5 sec Power supply of transistor, V C = 20 V Oscilloscope vertical range = 300 mv, Oscilloscope sampling time = 20 µsec AC sampling sweep number: 1024 pt Averge : 36, tension = =1640g Due to step-back Tail signal A0906a.opj Time [sec] There are some issues need to be improved for the ID measurement. So we just use the Hall probe to measure the ID. But it can be used to determine the field center of the quadrupole and sextupole magnet precisely.

62 Summary Lattice magnet - Moving fixed angle Hall probe system => point-by-point for any type magnet - Rotating coil system => global measurement for multipole magnets - Stretch wire system => simple mechanism for quick double check Insertion device magnet - Three-orthogonal Hall probe system => helical field for phase shimming - Highly automatic Helmholtz system => magnet block sorting - Pulse-wire system (not yet mature) => mini-gap undulator - Stretch wire system => fast multipole shimming 3D-Hall probes issues - Position & angle calibration on a reference magnet should be done - The planar Hall effect and probe temperature should be compensated - Field calibration should consider the orthogonal between three Hall probe Wire measurement system - The wire length for the harmonic components measurement should be within 1 m long for Cu wire and 2 m long for Be-Cu wire to keep high precision of 0.01% - Use the Litz wire to enhance the resolution and accuracy - Print-circuit board as wire is good for rotating coil

63 Thanks for your attention