PNPI polarized target for pion-nucleon scattering measurements at intermediate energies A.V Aldushchenkov, A.G. Dernyatin, A.I. Kovalev, D.V. Novinsky,

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Presentation transcript:

PNPI polarized target for pion-nucleon scattering measurements at intermediate energies A.V Aldushchenkov, A.G. Dernyatin, A.I. Kovalev, D.V. Novinsky, I. Okunev, V.A. Shchedrov, V.V. Sumachev, V.Yu. Trautman. Petersburg Nuclear Physics Institute, Gatchina, Leningrad district, , Russia. I.G. Alekseev, P.E. Budkovsky, V.P. Kanavets, L.I. Koroleva, B.V. Morozov, V.M. Nesterov, V.V. Ryltsov, D.N. Svirida, A.D. Sulimov. Institute for Theoretical and Experimental Physics, Moscow, , Russia. N.A. Bazhanov, E.I. Bunyatova Joint Institute for Nuclear Research, Dubna, Moscow district, , Russia. D. Novinsky (PNPI)

 The polarization parameters (P, R, A) measurement results above pion momentum above 1000 MeV/c made it possible to resolve part of discrete ambiguities in existing partial-wave analyses (PWA’s)  The polarization experiments at  N-elastic scattering use the proton polarized target.  The experiment uses a polarized proton target in which free protons have vertical polarization or polarization in the elastic scattering plane.  Uncertainty (abs.) is ±~2% at 70% of polarization magnitude.  The area under the PMR curve is determined using a Q meter. Preface D. Novinsky (PNPI)

The physics goals D. Novinsky (PNPI)

Experimental Setup, ITEP (Moscow) D. Novinsky (PNPI) MAIN ELEMENTS:  Vertically polarized proton target PT  4 sets of wire chambers for tracking  Trigger scintillation counters TARGET:  Cylinder  30mm, h=30mm, propanediole C 3 H 8 O 2, free proton density  10 %  Magnetic field 2.5 T  3 He evaporation type cryostat at 0.5 K  Dynamic nuclear orientation  Polarization (70-80) %, measurement accuracy ±2 %  Sign reverse once per day Beam Arm Proton Arm Pion Arm I Pion Arm II Pion Beam

Cryostat in the vertical sectional view D. Novinsky (PNPI) 1 – helium-3 pump-out 2 – neck 3 – helium-4 pump-out 4,11 – nitrogen screens 5,21 – helium inputs 6– nitrogen tank 7– magnet 8 – window 9 – magnet frame 10 – housing 12 – indium compaction 13 – rotating tee-joint 14 – helium-4 output through current-input 15 – connection to current source 16 – current-input compaction and helium-4 output 17 – current-input 18 – helium tank (at 4.2 K) 19 – refrigerator 20 – appendix with target (C 3 H 8 O 2 ) matter

Target: topview plane D. Novinsky (PNPI) 1 – target window, 2 – nitrogen screen, 3 – magnet area, 4 – container with the target (C 3 H 8 O 2 ) matter inside superconductive Helmholz coils

Polarization measurements D. Novinsky (PNPI)  polarization pump by the dynamic nuclear orientation method up to absolute value 70– 80%  method of proton magnetic resonance (PMR),  measurements are based on the calculations of square under the PMR curve: the system containing Q-meter with sequential contour and signal digitalization  Calibration is based on the equilibrium state at temperature 0.8 – 1.4 K

Polarization measurements D. Novinsky (PNPI)  Signal and background  Background: to take away signal from center by means of the magnetic field change

Polarization measurements D. Novinsky (PNPI)  Calibration: the equilibrium state

Electronic providing of the polarized target  Modernization of the target measurements  Two PCI-cards are inserted into the PC-board (Remote computer PC1 ).  Usage of PCI-card DAS6036 and the PCI-card PCI-1723 ADC and DAC with grade ≥ 14 bit, transformation is run by timer FIFO Transformation time ≤ 8  s  Usage of the new current source “Lambda-Genesys” for power supply of superconductive coils D. Novinsky (PNPI)

Current situation D. Novinsky (PNPI)  PCI-cards and programs are tested at PNPI  Current source is tested at PNPI and ITEP (Moscow)  Target location: ITEP  To continue spin rotation parameters mearurements, e.g. J-PARC  at PNPI accelerator  Cryostat at PNPI Netron Physics Department

 More than 20 years experiments Conclusions Acknowledgements  GREAT THANKS to the Organizing Committee ! ! ! D. Novinsky (PNPI)  Successful target work > 20 years  Modernization and new tests are required  New physics tasks  In memory of A.I. Kovalev ( )

PCI-card PCI-DAS6036  Low-cost, 16-channel, 200 kS/s analog I/O boards with two 16-bit analog outputs, eight digital I/O, and two counter/timers  16 channels of 16-bit A/D resolution  200 kS/s maximum sample rate  2 channels of 16-bit D/A at 10 kHz  8 bits DIO  2 16-bit counters D. Novinsky (PNPI)

PCI-card PCI-1723 (Advantech)  16-bit, 8-channel Non-isolated Analog Output CardMain Features  Auto calibration function  A 16-bit DAC is equipped for each analog output channel  Synchronized output function  Output values retained after system hot reset  2-port (16-channel) user-defined digital input/output  Board ID D. Novinsky (PNPI)