Control of Beam Polarization at the NICA Collider A.M. Kondratenko 2, A.D. Kovalenko 1, M.A. Kondratenko 2, Yu.N. Filatov 1,3 and V.A. Mikhaylov 1 1 Join Institute for Nuclear Research, Dubna, Russia 2 Science and Technique Laboratory Zaryad, Novosibirsk, Russia 3 Moscow Institute of Physics and Technology, Dolgoprydny, Russia March 18 –19, 2013, Dubna, Russia Joint Institute for Nuclear Research International Workshop NICA-SPIN 2013

A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov NICA-SPIN2013, Dubna, March, 2013 Polarization control scheme in the Collider with spin tune = 0 If the two identical Siberian Snakes will be inserted in the opposite straight sections of the collider, then the spin tunes is equal to zero for any energies. Any arbitrary polarization direction of the particle is repeated after each turn. Thus, the possibility to stabilize any direction of the polarization at any point of the particle orbit by means of a small longitudinal field for different particle species is occurred. Blue arrows are the case of longitudinal polarization in SPD Red arrows are the case of vertical polarization in SPD Polarization in MPD in these cases is laying in the plane (zy) This case is analogues to the figure 8 shape collider in Jefferson Lab

Solenoids with stationary fields of B max ~1517 T can be used to obtain necessary integrals of longitudinal fields. Length of each solenoid can be limited to 4 5,5 m even in the case of deuterons. (B || L) max =425 Tm (protons) (B || L) max =480 Tm (deuterons) Solenoid-based Siberian Snake Polarization control scheme in the Collider with spin tune = 0 NICA-SPIN2013, Dubna, March, 2013 A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov

Polarization control in the Collider by means of small longitudinal field integrals is the spin rotation angle between the solenoids is the orbit rotation angle between the solenoids is the angle between the polarization and velocity directions are the spin rotation angles in the solenoids NICA-SPIN2013, Dubna, March, 2013 A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov

The scheme makes it possible: to provide polarization control of different particles (p,d, 3 He,…); to provide any direction of polarization in the particle orbit plane within the arcs (important for spin matching at injection, for polarimetry as well); to provide any direction of polarization in the vertical plane (zy) in the both collider detectors; realization of Spin Flipping System to avoid the closed orbit local displacement Polarization control in the Collider by means of small longitudinal field integrals NICA-SPIN2013, Dubna, March, 2013 A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov

Polarization control in the Collider by means of small longitudinal field integrals Inserts for proton and deuteron polarization control NICA-SPIN2013, Dubna, March, 2013 A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov

Polarization control in the Collider by means of small longitudinal field integrals NICA-SPIN2013, Dubna, March, 2013 A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov

are angles between quadrupole normal and vertical accelerator axis is quadrupole gradient L S, mL 1, mL 2, m L, m 1 2 2,40,150,70, B || L ||,T m B ||, Tk 1, m -2 k 2, m -2 G 1, T/mG 2, T/m protons255,20,560, deuterons8016,61,11,44863 NICA-SPIN2013, Dubna, March, 2013 The solenoid coupling compensation for half Siberian Snake A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov

are angles between quadrupole normal and vertical accelerator axis is quadrupole gradient L S, mL 1, mL 2, m L, m 1 2 0,400,30 0,10 37,8 31,5 B || L ||,T m B ||, Tk 1, m -2 k 2, m -2 G 1, T/mG 2, T/m 0,50,630,120,735,55,533 NICA-SPIN2013, Dubna, March, 2013 The solenoid coupling compensation for polarization control A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov

ВЫВОДЫ SPIN2012, Dubna, September, 2012 Предложен уникальный метод управления поляризацией любых частиц в коллайдере NICA. С помощью двух сибирских змеек со стационарным продольным полем обеспечивается спиновая частота равная нулю на энергии эксперимента. Требуемые места для размещения соленоидальных сибирских змеек составляют 47 м Следует особо отметить возможность управления поляризацией дейтронов. На сегодня, в диапазоне энергий коллайдера, были получены пучки дейтронов лишь с вертикальной (поперечной к скорости) поляризацией. Крайне важной для экспериментов является реализация Spin Flipping систем. Появляется уникальная возможность создания «идеального» коллайдера в реальной магнитной структуре. Направление поляризации контролируется предельно малыми интегралами полей. Это позволит проводить эксперименты с поляризованными пучками с рекордно высоким уровнем точности. Например, проводить эксперименты по точному измерению характеристик частиц и античастиц. Станет реальным проведение «фантастических» экспериментов об обнаружении дипольных моментов частиц и т.д. A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov

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