control of beam polarization at the nica collider a.m. kondratenko 2, a.d. kovalenko 1, m.a....
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Control of Beam Polarization Control of Beam Polarization
at the NICA Colliderat the NICA Collider
A.M. Kondratenko2 , A.D. Kovalenko1, M.A. Kondratenko2 ,
Yu.N. Filatov1,3 and V.A. Mikhaylov1
1Join Institute for Nuclear Research, Dubna, Russia 2 Science and Technique Laboratory Zaryad, Novosibirsk, Russia
3Moscow Institute of Physics and Technology, Dolgoprydny, Russia
"ADVANCED STUDIES INSTITUTE – SYMMETRIES AND SPIN"
(SPIN-PRAHA-2013 AND NICA-SPIN-2013)
July 7 –13, 2013, Prague , Czech Republic
2A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov
SPIN-Praha’2013, Prague, 7-13 July, 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
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Solenoids with stationary fields of Bmax~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
A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov
SPIN-Praha’2013, Prague, 7-13 July, 2013
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Polarization control in the Collider by means of small longitudinal field integrals
Gy
is the spin rotation angle between the solenoids
y
yz
sin
)sin(21
yz
sin
sin22
is the orbit rotation angle between the solenoids is the angle between the polarization and velocity directions
21, zz are the spin rotation angles in the solenoids
B
LBG i
zi||1
zy eeS
cos sinSPD
A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov
SPIN-Praha’2013, Prague, 7-13 July, 2013
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The scheme makes it possible: to provide polarization control of different particles (p,d,3He,…); 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
A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov
SPIN-Praha’2013, Prague, 7-13 July, 2013
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Polarization control in the Collider by means of small longitudinal field integrals
5,3 5,3
Inserts for proton and deuteron
polarization control
A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov
SPIN-Praha’2013, Prague, 7-13 July, 2013
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Polarization control in the Collider by means of small longitudinal field integrals
A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov
SPIN-Praha’2013, Prague, 7-13 July, 2013
8
The optical transparency scheme of coupling compensation with a structural quadrupole
A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov
are angles between quadrupole normal and vertical accelerator axis 45i
is the structural defocusing quadrupoleG0 -2
0 m ,60k
LS, m L0, m L1, m L2, m L, m Ltot, m
0,40 0,40 0,30 0,30 0,10 3,8
B||L||,Tm B||, T k1, m-2 k2, m-2 G1, T/m G2, T/m
0,5 0,63 0,05 0,1 2,2 4,5
mT45 B
0GGi
SPIN-Praha’2013, Prague, 7-13 July, 2013
xBG yi / is quadrupole gradient ][m,/ -2BGk ii is the spin rotation angle in solenoids
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The coupling compensation scheme 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 21, xBG yi / is quadrupole gradient ][m,/ -2BGk ii
LS, m L1, m L2, m L, m 1 2
2,4 0,15 0,7 0,10 45 36
B||L||,Tm B||, T k1, m-2 k2, m-2 G1, T/m G2, T/m
protons 25 5,2 0,56 0,89 25 40
deuterons 80 16,6 1,1 1,4 48 63
mT45 B
SPIN-Praha’2013, Prague, 7-13 July, 2013
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Conclusions
A.M.Kondratenko A.D.Kovalenko,Yu.N.Filatov, M.A.Kondratenko, V.A. Mikhaylov
SPIN-Praha’2013, Prague, 7-13 July, 2013
Schemes were developed for NICA thateliminate depolarization problem during accelerationallow control of the beam polarization with small fields without
orbit perturbationmake it possible to efficiently control the polarization of a beam of
particles with any anomalous magnetic moment including particles with small anomalous moments, such as deuterons
allow independent adjustment of polarization orientations in the two straights
allow single-turn as well as multi-turn spin-flipping schemesmake possible ultra-high precision experiments with polarized
beams
Thank you for your attention!