NIST designed cryostat

Transcription

1 NIST designed cryostat Pulse tube (60K, 3K), 16 hours 300K 3K Adiabatic Demagnetization Refrigerator (ADR) double-stage salt pills: GGG 1K, FAA 50mK Snout: 240-pixel TES (Mo-Cu bilayer + 4μ Bi absorber) 1 pixel 320um x 300um, total ~23 mm 2 High Precision Devices, Inc. NIST Photos by D.R. Schmidt (NIST) Gold coated Si collimator Bi + TES

2 Feasibility test with π - beam@psi First application of the TES to a hadron beam experiment Pionic carbon X-ray (4f 3d ~ 6.4 kev, no strong interaction effect) πm1 beam line in Paul Scherrer Institute Beam time: Oct. 27 ~ Nov. 5, 2014 Top view Lead shield TES arrays Carbon target 173 MeV/c π - beam e(μ) : π ratio = 2.5 : 1 total intensity: up to 6 MHz BC1 π beam carbon degrader lead collimator BC2 BC3 BC4 x-ray tube horizontal position [mm] beam profile w/o degrader π stop trigger = BC1 & BC2 & BC3 & BC4 7 T. Hashimoto@JPS 70th annual meeting

3 Measurement at the πm1 beam line of PSI

4 Measurement at the πm1 beam line of PSI

5 Pionic Carbon X-rays Calibrated with Cr and Co X-ray lines FeKα1 Counts / 1 ev FeKα2 πc 4-3 Carbon TES Data taking Beam (π- & e-) Calib. X-ray 13.5 hours 1.45 MHz 4.4 Hz/pixel Beam direct hit 0.4 Hz/pixel Beam hit on array ~400 Hz

6 Energy dependence of the LE tail fraction 0.3 BrKa Calibration targets Low-energy tail fraction CrKa π-c 4-3 FeKa MnKa CoKa CuKa GeKa AsKaSeKa GaKa GaAs Se RbBr Ge Photo by J.Uhlig (Lund) We can estimate the LE tail fraction for hadronic atom X-rays. reduce the systematic uncertainty

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8 Thermal cross-talk calculation

9 thermal diffusion in Si substrate convolution with TES time response P (t) / e t/ fall fall e t/ rise rise

10 Background from beam Counts / 1 ev Data MC(all) - MC(π - beam) MC(µ beam) - MC(e beam) Counts / 1 ev simulation by T.Hashimoto (RIKEN) Data MC(all) MC(proton) - MC(e ) + MC(e ) MC(γ) Energy (ev) Energy (ev) Figure 12: Measured TES self-triggered energy spectrum obtained at PSI experiment with beam-on and no calibration x-ray (x-ray tube off) conditions, compared with the simulated spectra. The left and right panels include different disaggregated data with initial beam particles (left) and particle species hitting on the TES (right), respectively. Beam momentum Total beam intensity Simulation πm1 at PSI 173 MeV/c /sec K /π /µ /e ratio / 40% / 5% / 55% Measured TES trigger rate / pixel 0.64/sec 0.71±0.11 /sec

11 Normalized Co Kα2 Co Kα1 ΔE=5.2 ev ΔE=8.0 ev ΔE=11eV ΔE=13eV Lines: changed only ΔE Can not fit the region between peaks of beam on data Normalized LE tail HE tail <ΔEFWHM> can not explain the LE and HE tails beam 2.8 MHz beam 1.45 MHz beam off

12 Energy dependence of energy resolution 14 beam 2.8 MHz beam 1.45 MHz FWHM (2.355 σ) [ev] beam off FeKa CoKa CrKa GaKa GeKa AsKa SeKa BrKa 4 MnKa CuKa

13 Low energy tail fractions Low-energy tail fraction FeKa CoKa ft CuKa GaKa SeKa GeKa AsKa BrKa beam 2.8 MHz beam 1.45 MHz beam 2.8 MHz ( 3 He target) beam off 0.16 CrKa

14 fht High-energy tail fraction High-energy tail fraction beam 2.8 MHz beam 1.45 MHz beam 2.8 MHz ( 3 He target) CrKa FeKa CoKa Relatively large systematics uncertainty for high-e elements almost constant fraction for Cr, Fe, and Co Not perfect fit, no information of complex

15 Pionic 3He X-ray measurement Counts / 8 ev π 3He 2p-1s FWHM 12 ev Γ ~30 ev