Polarimetry Concept Based on Heavy Crystal Hadron Calorimeter

Transcription

1 Polarimetry Concept Based on Heavy Crystal Hadron Calorimeter for the JEDI Collaboration CALOR 216 May 17, 216 Irakli Keshelashvili

2 Introduction JEDI Polarimetry Concept MC Simulations Laboratory and Beam Tests Outlook Summary May 17, 216 Irakli Keshelashvili JEDI Collaboration 2 / 22

3 Introduction EDM Electric Dipole Moment JEDI Jülich Electric Dipole moment Investigation Collaboration members: 122 B a r y o g e n e s i s S t a n d a r d M o d e l - not enough CP violation nedm May 17, 216 Irakli Keshelashvili JEDI Collaboration 3 / 22

4 Why Storage Ring? Measuring EDM for Charged Pericles + - d v s E B d s dt = d E+ d ( v B) Store polarized deuterons (COSY) Interact with an E-field (Wien-Filter) Analyze Polarization Build-up (this talk) May 17, 216 Irakli Keshelashvili JEDI Collaboration 4 / 22

5 COSY (COoler SYnchrotron) at Forschungszentrum Jülich (Germany) Energy range: GeV (p) GeV (d) Max. momentum ~ 3.7 GeV/c Electron and Stochastic cooling Internal and external beams High polarisation (p,d) Spin manipulation!!! May 17, 216 Irakli Keshelashvili JEDI Collaboration 5 / 22

6 Ideal Polarimeter General Requirements for Storage Ring EDM sredm Precision Experiment complementary LHC Energy Frontier Reaction with Large A y : Best dc dc!!! Maximum Detection & Data Taking Efficiency!!! Full f in Reasonable FOM(q) region!!! No Magnetic / Electric Field!!! Stability Long / Short Term!!! May 17, 216 Irakli Keshelashvili JEDI Collaboration 6 / 22

7 dc dc Elastic 27 MeV Y. Satou et al., Phys. Lett. B 549, 37 (22). A y MeV 2MeV FOM MeV FOM = A y 2. s.2 [mb/sr] Ω d s d MeV 2MeV Θ [degree] 1 2MeV Θ [degree] Θ [degree] May 17, 216 Irakli Keshelashvili JEDI Collaboration 7 / 22

8 JEDI Polarimetry Concept Optimized for dc dc Reaction Target chamber Pl. Sci. tracking LYSO HCAL PMT Vacuum pipe C-block COSY beam BPM Ballistic diamond pellet target BPM May 17, 216 Irakli Keshelashvili JEDI Collaboration 8 / 22

9 LYSO Based Polarimeter Modular Setup / Easy Splitting Two layer, 2x36 segment de/e plastic scintillators Vacuum flight chamber Carbon target chamber LYSO modules 3x3x8mm Rogowski coils; Beam position monitors May 17, 216 Irakli Keshelashvili JEDI Collaboration 9 / 22

10 ucpu ucpu FADC Based DAQ 1 % Data Taking Efficiency Crystal PMT SADC FPGA FIFO Pile-Up Struck SIS bit resol. -2V to +2V 16 channel 64MS/ch 25MS/s 4ns per S. SWITCH... May 17, 216 Irakli Keshelashvili JEDI Collaboration 1 / 22

11 LYSO Modules First and Second Generation PMT Hamamatsu R1548 n 2 =1.51 LYSO Crystal 3x3x1mm n 1 =1.82 Mechanical Holding Magnetic Shielding ST-37 n=ö(n 1 n 2 )=1.66 SensL C / J 6x6 mm Sensor 35um Pixel 2x2 Array LYSO Crystal 3x3x8mm n 1 =1.82 Aluminum Housing May 17, 216 Irakli Keshelashvili JEDI Collaboration 11 / 22

12 LYSO Module Assembly and Mechanical Stability Entwurf - 1:1 - May 17, 216 Irakli Keshelashvili JEDI Collaboration 12 / 22

13 LYSO Crystal Wrapping and Homogeneity Test Double Layer Teflon 5mm Teflon 27 MeV deuteron beam Laser reflection 5mm Tedlar May 17, 216 Irakli Keshelashvili JEDI Collaboration 13 / 22

14 LYSO ( 176 Lu) + 6 Co Tests 8 % Resolution at 2.5 MeV Photons keV 6 LYSO+ Co keV LYSO Difference keV May 17, 216 Irakli Keshelashvili JEDI Collaboration 14 / 22

15 G4: Elastic dc dc Scattering Very Clear Signature E k elastic [MeV] elastic_theta_ek Entries Mean x Mean y RMS x RMS y ϑ lab elsetic [deg] May 17, 216 Irakli Keshelashvili JEDI Collaboration 15 / 22

16 G4: Inelastic dc X Simulation Far Below Elastic E-Spectrum elastic [MeV] ϑ proton (break-up) lab proton_theta_ek Entries Mean x Mean y RMS x RMS y elastic [MeV] ϑ neutron lab neutron_theta_ek Entries Mean x Mean y RMS x 34.5 RMS y E k E k ϑ (d C p X) inelsetic [deg] lab ϑ (d C n X) inelsetic [deg] lab elastic [MeV] E k deuteron ϑ lab deuteron_theta_ek Entries Mean x 72.5 Mean y 1.91 RMS x RMS y ϑ (d C d X) inelsetic [deg] lab num. of events number of secondaries (inelastic) num_secondaries Entries Mean 6.6 RMS num. of secondaries May 17, 216 Irakli Keshelashvili JEDI Collaboration 16 / 22

17 Prototype Test BIG KARL Area External Proton and Deuteron Beam a) Front view LYSO crystal optical properties comparison w. Lithrani b) Top view Bragg peak scan. de/dx charakterisation c) Top view Absorbtion leangth determination Collimator Beam counter LYSO PMT HV 2D (X, ) table SADC FIFO May 17, 216 Irakli Keshelashvili JEDI Collaboration 17 / 22

18 Prototype Test BIG KARL Area External Proton and Deuteron Beam May 17, 216 Irakli Keshelashvili JEDI Collaboration 18 / 22

19 Time Resolution Cosmic and External Beam Time Resolution with 25 MS/s Far Below 1 ns QDC Energy Resolution at 2 MeV roughly 4 % Deuteron Reconstruction Efficiency at 8 % (Threshold 9 %) cosmis Run 411 (1-4.1) (1-4.2) Entries Mean.4387 ±.8 RMS.879 ±.5 χ 2 / ndf 52.6 / 53 Constant ± 5. Mean.4412 ±.7 Sigma.7145 ±.61 σ = 28ps χ 2 / ndf 16.6 / 63 Constant ± 5.2 Mean.2836 ±.6 Sigma.678 ± CFD [sample/4ns] t 3 σ = 27ps MeV FWHM = 4% Amp χ 2 / ndf 2.18e+6 / 2145 p 3 ±.2 p ±. p ±. p ±. p ± QDC 12bit [125fC] May 17, 216 Irakli Keshelashvili JEDI Collaboration 19 / 22

20 2 Prototype Characterization Using External Beam Incident vs Reconstructed d T kin Reconstructed Energy Resolution vs Incident d T kin Deuteron Identification Efficiency Bragg Peak, Absorption λ, Radiation Hardness FADC [a.u.] χ / ndf / 2 p ± p ±.1297 p ± 5.541e Energy [MeV] Resolution [%] = E E p E 2 χ / ndf.517 / 2 p ± p ± p2 ± p1 p2 E Energy [MeV] Deuteron Reconstruction Efficiency [%] λ E = A e LYSO Module 1 LYSO Module 2 MC Simulation χ / ndf / 3 Constant ±.1191 Slope.1888 ± 6.363e Energy [MeV] May 17, 216 Irakli Keshelashvili JEDI Collaboration 2 / 22

21 Next with 2x1 LYSO Modules Polarized Deuteron Beam / 6 Different Targets Target Station Beam Line Normalization Pl. Scint. 2x5 LYSO Cluster May 17, 216 Irakli Keshelashvili JEDI Collaboration 21 / 22

22 Summary Direct shot of protons and deuterons on LYSO Unpolarized deuteron and proton of: 1, 15, 2, 235, 27 MeV LYSO module development and mechanical construction: LYSO (2 types), PMT (2 types) and SiPM/MPPC (KETEK, SensL) 2 (+2) LYSO crystals will be tested: Saint Gobain (EU) 2x(3x3x1mm) EPIC Crystals (China) 1x(3x3x1mm) Saint Gobain 2x(15x3x1mm) 2x 1x LYSO modules in readout with polarized deuterons Analyzing power / FOM comparison of different targets May 17, 216 Irakli Keshelashvili JEDI Collaboration 22 / 22

23 Carbon Scattering Ellastic to Inelastic Ration May 17, 216 Irakli Keshelashvili JEDI Collaboration 1 / 7

24 Cosmic Signal vs Intrinsic Radiation 5ns TIME [s] Amplitude [V] mv 3 MeV Intrinsic radiation May 17, 216 Irakli Keshelashvili JEDI Collaboration 2 / 7

25 Targets Optimized for dc dc Reaction White Noise C-block target C-wire target May 17, 216 Irakli Keshelashvili JEDI Collaboration 3 / 7

26 JEDI Polarimetry Concept JüDiT Jülich Ballistic Diamond Pellet Target New Idea! COSY beam Vacuum pipe Target chamber Carbon exit window v=1m/s t= 1ms 1cm May 17, 216 Irakli Keshelashvili JEDI Collaboration 4 / 7

27 JEDI Polarimetry Concept Variable Effective Target Thickness N hits Readout t N beam current May 17, 216 Irakli Keshelashvili JEDI Collaboration 5 / 7

28 Cosmic Calibration K. Nowakowski, C. Dziwok % hco-6 Entries 66 Mean 243 RMS 98.8 χ 2 / ndf 13.5 / 87 Constant ± 2.5 Mean 288 ± 4.8 Sigma ± May 17, 216 Irakli Keshelashvili JEDI Collaboration 6 / 7

29 G4: Cosmic Simulation P. Maanen, LYSO 3x3x1mm with o, 45 o, 9 o o Horizontal ( ) o Inclined Vertical (9 ) E [MeV] May 17, 216 Irakli Keshelashvili JEDI Collaboration 7 / 7