Polarimetry Concept Based on Heavy Crystal Hadron Calorimeter for the JEDI Collaboration CALOR 216 May 17, 216 Irakli Keshelashvili
Introduction JEDI Polarimetry Concept MC Simulations Laboratory and Beam Tests Outlook Summary May 17, 216 Irakli Keshelashvili JEDI Collaboration 2 / 22
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
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
COSY (COoler SYnchrotron) at Forschungszentrum Jülich (Germany) Energy range:.45 2.8 GeV (p).23 2.3 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
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
dc dc Elastic Scattering @ 27 MeV Y. Satou et al., Phys. Lett. B 549, 37 (22). A y 1.8.6.4 27MeV 2MeV FOM 2 1 27MeV FOM = A y 2. s.2 [mb/sr] Ω d s d 1 1 1 5 1 15 2 25 3 27MeV 2MeV Θ [degree] 1 2MeV 1.1 5 1 15 2 25 3 Θ [degree] 5 1 15 2 25 3 Θ [degree] May 17, 216 Irakli Keshelashvili JEDI Collaboration 7 / 22
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
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
ucpu ucpu FADC Based DAQ 1 % Data Taking Efficiency Crystal PMT SADC FPGA FIFO Pile-Up Struck SIS 3316 14 bit resol. -2V to +2V 16 channel 64MS/ch 25MS/s 4ns per S. SWITCH... May 17, 216 Irakli Keshelashvili JEDI Collaboration 1 / 22
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
LYSO Module Assembly and Mechanical Stability 215 3.9. Entwurf - 1:1 - May 17, 216 Irakli Keshelashvili JEDI Collaboration 12 / 22
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
LYSO ( 176 Lu) + 6 Co Tests 8 % Resolution at 2.5 MeV Photons 12 117keV 6 LYSO+ Co 5 1 8 133keV 4 3 2 1 LYSO Difference 6 5 1 15 2 25 3 35 4 4 2 25keV 15 2 25 3 35 May 17, 216 Irakli Keshelashvili JEDI Collaboration 14 / 22
G4: Elastic dc dc Scattering Very Clear Signature E k elastic [MeV] 3 28 26 elastic_theta_ek Entries 24583 Mean x 8.731 Mean y 268.1 RMS x 6.864 RMS y 3.38 25 2 24 1 2 3 4 5 6 ϑ lab elsetic [deg] 15 22 2 1 18 5 16 May 17, 216 Irakli Keshelashvili JEDI Collaboration 15 / 22
G4: Inelastic dc X Simulation Far Below Elastic E-Spectrum elastic [MeV] 16 14 12 ϑ proton (break-up) lab proton_theta_ek Entries 385951 Mean x 47.73 Mean y 57.64 RMS x 35.14 RMS y 48.72 elastic [MeV] 16 14 12 ϑ neutron lab neutron_theta_ek Entries 3757577 Mean x 45.48 Mean y 58.49 RMS x 34.5 RMS y 48.16 E k E k 1 1 8 8 6 6 4 4 2 2 2 4 6 8 1 12 14 16 18 ϑ (d C p X) inelsetic [deg] lab 2 4 6 8 1 12 14 16 18 ϑ (d C n X) inelsetic [deg] lab elastic [MeV] E k 16 14 12 1 8 6 4 2 deuteron ϑ lab deuteron_theta_ek Entries 36934 Mean x 72.5 Mean y 1.91 RMS x 36.68 RMS y 9.66 2 4 6 8 1 12 14 16 18 ϑ (d C d X) inelsetic [deg] lab num. of events 7 1 6 1 5 1 4 1 3 1 2 1 1 number of secondaries (inelastic) num_secondaries Entries 197448 Mean 6.6 RMS 1.392 1 2 4 6 8 1 12 14 16 18 2 num. of secondaries May 17, 216 Irakli Keshelashvili JEDI Collaboration 16 / 22
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
Prototype Test BIG KARL Area External Proton and Deuteron Beam May 17, 216 Irakli Keshelashvili JEDI Collaboration 18 / 22
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 %) 5 4 3 2 1 cosmis Run 411 (1-4.1) (1-4.2) Entries 13113 Mean.4387 ±.8 RMS.879 ±.5 χ 2 / ndf 52.6 / 53 Constant 425.6 ± 5. Mean.4412 ±.7 Sigma.7145 ±.61 σ = 28ps 4.2 4.1 1 2 χ 2 / ndf 16.6 / 63 Constant 455.6 ± 5.2 Mean.2836 ±.6 Sigma.678 ±.5 2 1.5 1.5.5 1 CFD [sample/4ns] t 3 σ = 27ps 35 3 25 2 15 1 5 2 MeV FWHM = 4% Amp χ 2 / ndf 2.18e+6 / 2145 p 3 ±.2 p1 2114 ±. p2 37.3 ±. p3 119.8 ±. p4 982.7 ±.4 5 1 15 2 25 3 35 4 QDC 12bit [125fC] May 17, 216 Irakli Keshelashvili JEDI Collaboration 19 / 22
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.] 18 16 14 12 1 8 6 2 χ / ndf 43.35 / 2 p ± p1.6649 ±.1297 p2.1226 ± 5.541e 5 8 1 12 14 16 18 2 22 24 26 28 Energy [MeV] Resolution [%] 6 5 4 3 2 1 = E E p E 2 χ / ndf.517 / 2 p 212.1 ± 47.99 p1 25.44 ± 2.955 p2 ± 68.18 p1 p2 E 8 1 12 14 16 18 2 22 24 26 28 Energy [MeV] Deuteron Reconstruction Efficiency [%] 1 8 6 4 2 λ E = A e LYSO Module 1 LYSO Module 2 MC Simulation χ / ndf 1.319 / 3 Constant 4.687 ±.1191 Slope.1888 ± 6.363e 5 8 1 12 14 16 18 2 22 24 26 28 Energy [MeV] May 17, 216 Irakli Keshelashvili JEDI Collaboration 2 / 22
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
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
Carbon Scattering Ellastic to Inelastic Ration May 17, 216 Irakli Keshelashvili JEDI Collaboration 1 / 7
Cosmic Signal vs Intrinsic Radiation 5ns 6 1.5.5.1.15 TIME [s] Amplitude [V].2.4-74 mv 3 MeV Intrinsic radiation.6.8 1 May 17, 216 Irakli Keshelashvili JEDI Collaboration 2 / 7
EDDA@COSY Targets Optimized for dc dc Reaction White Noise C-block target C-wire target May 17, 216 Irakli Keshelashvili JEDI Collaboration 3 / 7
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
JEDI Polarimetry Concept Variable Effective Target Thickness N hits Readout t N beam current May 17, 216 Irakli Keshelashvili JEDI Collaboration 5 / 7
Cosmic Calibration K. Nowakowski, C. Dziwok 25 23.6% hco-6 Entries 66 Mean 243 RMS 98.8 χ 2 / ndf 13.5 / 87 Constant 241.8 ± 2.5 Mean 288 ± 4.8 Sigma 356.1 ± 9. 2 15 1 5 5 1 15 2 25 3 35 4 May 17, 216 Irakli Keshelashvili JEDI Collaboration 6 / 7
G4: Cosmic Simulation P. Maanen, LYSO 3x3x1mm with o, 45 o, 9 o 18 16 o Horizontal ( ) 14 12 o Inclined 45 1 8 Vertical (9 ) 6 4 2 2 4 6 8 1 12 14 E [MeV] May 17, 216 Irakli Keshelashvili JEDI Collaboration 7 / 7