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Beam Position Monitoring SQUID array

Beam Position Monitoring SQUID array. Andrei Matlashov, A Selcuk Haciomeroglu, A Yong-Ho Lee, B A IBS/Center for Axion and Precision Physics , B KRISS Daejeon, Korea. a ndrei@ibs.re.kr. IBS/CAPP and KRISS Collaboration. G1 Beam Position Monitoring SQUID system.

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Beam Position Monitoring SQUID array

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  1. Beam Position Monitoring SQUID array Andrei Matlashov,ASelcukHaciomeroglu,A Yong-Ho Lee,B AIBS/Center for Axion and Precision Physics, BKRISS Daejeon, Korea andrei@ibs.re.kr

  2. IBS/CAPP and KRISS Collaboration

  3. G1 Beam Position Monitoring SQUID system Magnetically shielded room FLL Electronics ---- Acquisition/Analysis Dewar DC power/ SQUID control/ SQUID Gradiometers 8 channels

  4. AxialWire-Wound First-Order Gradiometers SQUID Superconducting wire 50 mm Pickup coil Φ 20 mm dBz/dz Pickup coil: Diameter 20 mm, baseline 50 mm

  5. Wire-wound Pick-up Coils Bonding Conventional bonding (Star Croelectronics) KRISS method SQUID chip Nb bonding Direct bonding Nb block Stray pickup area Stray pickup area: 0.3 mm x 2 mm = 0.6 mm2  Imbalance = 0.1 %  Better SNR or lighter MSR Diameter 20 mm: A=628 mm2

  6. 3-Layer Magnetically Shielded Room at CAPP

  7. SQUID Electronics Flux-lock loop circuits DC-power and acquisition • High-pass filter: 200 Hz • Low-pass filter: 2 kHz • Sensitivity: 1.0 nT/V and 0.01 nT/V with Gain = 100 • LSB: 15 × 10-15 T and 0.15 × 10-15 T with Gain = 100

  8. G2 Beam Position Monitoring SQUID system Number of SQUID magnetometers: 2 × 8 Pickup coil: 2-turn wire-wound magnetometer, Ø 17mm SQUIDs-in-Vacuum Design Superconductive Shielding Superconducting Imaging Surface  the First-Order Gradiometers Horizontal Cylindrical Dewar System Field Resolution: 1.2 fT/√Hz @1 kHz

  9. G2 Beam Position Monitoring SQUID system Liquid He Vacuum SQUIDmagnetometer To p-beam line

  10. Cylindrical Dewar: Schematic OD 230 ID 70 Magnetic Shielding (optional) 250 Mag. shielding 900 Length 500 Volume 43 L ID 344 440 S.C. shielding SQUID OD 650 700

  11. Superconducting Imaging Surface

  12. Cylindrical Dewar: Cross-section

  13. Cylindrical Dewar: Assembly

  14. Cylindrical Cryostat: Re-Liquefier OD 230 ID 70 250 Mag. shielding 900 ID 344 S.C. shielding OD 650

  15. 16 channel SQUID Magnetometers Array

  16. Magnetometer Design

  17. Magnetometer Parameters

  18. New Generation SQUID Magnetometers 0.33 fT/Hz1/2 Pick-up Loop: 12 × 12 mm2 Noise = 0.33 fT/Hz1/2 Pick-up Loop: 24 × 48 mm2 Noise = 0.11 fT/Hz1/2 IPHT, Jena, Germany (2011) Supercond. Sci. Technol. 24 (2011) 065009(5pp) doi:10.1088/0953-2048/24/6/065009

  19. SQUIDs Control Electronics and PS

  20. 16 channel SQUID Electronics Flux-lock loop circuits DC-power and acquisition • Output: Digital, optical • High-pass filter: 200 Hz • Low-pass filter: 2 kHz • Optimum signal frequency range: 500 ~ 1,000 Hz

  21. SQUID Read-out and Control Electronics Flux-Lock-Loopbox Control External trigger port Analog-to-digital converter 24-bit resolution 10 kSample/s

  22. Optical Controls and Read-outs Computer (Digital I/O) FLL input (digital/serial) Trigger input (Electrical or optical) FLL control output 16 bit resolution 10 kSample/s per channel FLL output: Optical signal

  23. BMP Signals Triggering and Averaging e.g. fm=1 kHz 1 s 1 ms Signal Trigger <Measured data> Ch000 . . . Ch5 Ch4 Ch3 Ch2 Ch1 Trigger 1000 epochs/s 1 epoch

  24. SQUIDs Control Software

  25. SQUIDs I-V and V-Ф monitoring and adjustment

  26. Data Acquisition and Averaging Acquisition (Saving) window Real time averaging window During data saving, real time averaging window appears. Data are saved every 20 s (default value).

  27. BMP Systems in the Storage Ring • … Optical transmission (signal & control) • Storage ring • ADC: 16 bit, 10 kS/s sampling Data (1000 s/epoch) 16-ch Module <Averaging/Analysis> <Control/Acquisition> Interference-free control Noise-free acquisition No time-delay bet. modules

  28. SUMMARY • The First generation (G1) of BMP system: tested at KRISS and moved to CAPP for further tests and research. • The Second generation (G2) of BMP system: designed, all key • components manufactured; it will be assembled in May 2018. • Field Resolution: current G1 system  3.5 fT/√Hz @1 kHz • Field Resolution: under construction G2 system  1.2 fT/√Hz @1 kHz • Field Resolution: new generation SQUIDs  0.15 fT/√Hz @1 kHz

  29. THANKS FOR YOUR ATTENTION !

  30. DC SQUID Noise In ~ 0/4 applied I I0 I0 = RJ Rd RJ Vn n0 Rd L (N+1/2)0 V 1. Circulating current noise due to 2RJ: In=(4kBT/2RJ)0.5 SQUID inductance: L Flux noise=In×L={4kBT(L2/2RJ)}0.5 2. Voltage noise due to SQUID dynamic resistance Rd: Vn=(4kBTRd)0.5 Flux-to-voltage transfer: V Flux noise: Vn/V=(4kBTRd/V2)0.5 Total flux noise (intrinsic): n={4kBT(L2/2RJ + Rd/V2)}0.5= ~L/Rd0.5

  31. Single-chip Magnetometers from IPHT, Jena Sub-micrometer Josephson junctions Intrinsic noise: 0.33 fT/√Hz

  32. UC Berkeley Ø63.5 mm Gradiometer Single-channel dewar ez-SQUID Sensitivity: 0.7 fT/√Hz 63.5 mm 76 mm

  33. LANL Ø60 mm Gradiometers 2nd-order gradiometer 1 d=37 mm, b=60 mm, Noise: 1.2-2.8 fT/√√Hz at 1 kHz 2nd order gradiometer 2 d = 90 mm, b= 90 mm, Noise < 0.5 fT/√Hz

  34. Preamplifier Noise Contribution In direct readout mode Current bias Rw @Tav SQUID Rd Voltage output Vn, In 4.2 K Preamp. Noise of SQUID system: Φ2intrinsic + Φ2preamp Preamplifier noise contribution: Φpreamp=Vn,tot/(δV/δΦ) Vn,tot= {Vn2 + In2(Rd+Rw)2 + 4kBTSQRd + 4kBTavRw}0.5

  35. Low-noise Preamplifier Single-ended Lower input noise Higher ground noise Differential Higher input noise Less ground noise

  36. Preamplifier Noise Moderate input voltage noise Moderate input current noise cf) Low input voltage noise  High input current noise Large Rd: InRd>Vn

  37. KRISS Whole-head MEG System • B/Φ: 0.46 nT/Φ0 @ 100 Hz 2.5 fT/√Hz

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