polarized proton beam acceleration at nuclotron with the use of the solenoid siberian snake
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Polarized Proton Beam Acceleration at Polarized Proton Beam Acceleration at
Nuclotron with the use of the Nuclotron with the use of the
Solenoid Siberian SnakeSolenoid Siberian Snake
Yu.N. Filatov1,3, A.D. Kovalenko1, A.V. Butenko1,
A.M. Kondratenko2, M.A. Kondratenko2 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
July 7 –13, 2013, Prague , Czech Republic
"ADVANCED STUDIES INSTITUTE – SYMMETRIES AND SPIN"
(SPIN-PRAHA-2013 AND NICA-SPIN-2013)
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Polarized proton and deuteron in Nuclotron
B. Issinskii et al., “Deuteron Resonance Depolarization Degree in JINR Nuclotron,” in Proc. of VI Workshop on HESP, Protvino, 1996
N. I. Golubeva et al., “Study of Depolarization of Deuteron and Proton Beams in Nuclotron Ring,” Preprint JINR R9-22-289 (Dubna, 2002)
S.Vokal et al. “Program of Polarization Studies and Capabilities of Accelerating Polarized Proton and Light Nuclear Beams at the Nuclotron of the Joint Institute for Nuclear Research”, Physics of Particles and Nuclei Letters, 2009, Vol. 6, No. 1, pp. 48–58.
I.Meshkov and Yu.Filatov , “ Polarized hadrons beams in NICA project”, 19th International Spin Physics Symposium, 2010 Jülich, Germany
A.Kovalenko et al. The NICA Facility in polarized proton operation mode, IPAC’11
Yu. Filatov et al., Polarized Proton Beam Acceleration at Nuclotron with the use of the Polarized Proton Beam Acceleration at Nuclotron with the use of the Solenoid Siberian SnakeSolenoid Siberian Snake, SPIN-Praha 2013, July 7- 13, 2013, Prague
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2 4 6 8 1 0 1 2
1
1
2
2 4 6 8 1 0 1 2
1
1
lg(w/wD)
Ep , GeVwD = 7.310-4
lg(w/wD)
wD = 7.310-4 Ep , GeV
2.Integer res. spin = k
Spin resonances at Nuclotron
lg(w/wD)
2 4 6 8 1 0 1 2
2
1
1
3. Nonsuperperiodic res. spin = m Qy , m kp
Ep , GeV
lg(w/wD)
4. Coupling res. spin = m Qx , m kp
wD = 7.310-4
2 4 6 8 1 0 1 2
2
1
1Ep , GeV
wD = 7.310-4
1.Intrinsic res. spin = kp Qy
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5 16
14
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Dangerous resonances are marked with red caps dB/dt = 1 T/s
An option: acceleration up to 6 GeV and extraction into NICA collider for further acceleration up to 12 GeV max.
Yu. Filatov et al., Polarized Proton Beam Acceleration at Nuclotron with the use of the Polarized Proton Beam Acceleration at Nuclotron with the use of the Solenoid Siberian SnakeSolenoid Siberian Snake, SPIN-Praha 2013, July 7- 13, 2013, Prague
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Full and Partial Siberian Snake
Yu. Filatov et al., Polarized Proton Beam Acceleration at Nuclotron with the use of the Polarized Proton Beam Acceleration at Nuclotron with the use of the Solenoid Siberian SnakeSolenoid Siberian Snake, DSPIN-2012, Sep 17- 22, 2012, Dubna
Spin tune in accelerator with Partial Siberian Snake
B
LBGG z
z ||)1(,2
coscoscos
xyz k ,2
z
kz w
2
eliminate integer
resonances
eliminate intrinsic
resonances
Full Siberian Snake
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Solenoid Siberian Snake in Nuclotron (Ekin=5GeV)
Total longitudinal field integral:
(B||L)max= 22 Tm
Full Siberian Snake Partial Siberian Snake(B||L)max=11 Tm, (z=/2), |k-y,x|<0.25
(B||L)max=5,5 Tm, (z=/4), |k-y,x|<0.125(z=)
Yu. Filatov et al., Polarized Proton Beam Acceleration at Nuclotron with the use of the Polarized Proton Beam Acceleration at Nuclotron with the use of the Solenoid Siberian SnakeSolenoid Siberian Snake, SPIN-Praha 2013, July 7- 13, 2013, Prague
2/zy 2/ y
It is appropriate to apply partial Siberian Snake in Nuclotron for proton
polarization preservation during acceleration (acceleration time acc~1
sec). It allows to use free space of Nuclotron more efficiently.
is angle between polarization and vertical axisy
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Conventional coupling compensation scheme
Yu. Filatov et al., Polarized Proton Beam Acceleration at Nuclotron with the use of the Polarized Proton Beam Acceleration at Nuclotron with the use of the Solenoid Siberian SnakeSolenoid Siberian Snake, SPIN-Praha 2013, July 7- 13, 2013, Prague
Two free spaces of Nuclotron for installation of the partial Siberian Snake
,m75,01 2
0
x
B
Bk y
.m3,0 1
00 quadLkq
Compensation quadrupoles for any spin rotation angle of solenoids 0qqi
Conventional scheme allows to compensate the solenoids coupling, but it significantly changes the orbital characteristics of Nuclotron ring. Conventional coupling compensation schemes with optical transparency condition are unfeasible in Nuclotron.
m.2T,5sec,1~, Ssolaccsol LBpB Solenoid parameters:
Structural quadrupole:
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Coupling Compensation
0 Lsol 1
z1
sol 2
z2
q1, 1 q2, 2
… sol i
zi
qi, i
…
Yu. Filatov et al., Polarized Proton Beam Acceleration at Nuclotron with the use of the Polarized Proton Beam Acceleration at Nuclotron with the use of the Solenoid Siberian SnakeSolenoid Siberian Snake, SPIN-Praha 2013, July 7- 13, 2013, Prague
Consider a system of weak solenoids and quadrupoles in a straightsection
1 i
Coupling compensation and optical transparency conditions
Lqi
00 iq
Conventional scheme uses strong quadrupolesL
qi1
are angles between quadrupole normal and vertical accelerator axis i
1m
quadi
yquadi Lk
x
B
B
Lq
where
is net orbit angle in solenoids
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Coupling Compensation(section with one structural quadrupole)
Yu. Filatov et al., Polarized Proton Beam Acceleration at Nuclotron with the use of the Polarized Proton Beam Acceleration at Nuclotron with the use of the Solenoid Siberian SnakeSolenoid Siberian Snake, SPIN-Praha 2013, July 7- 13, 2013, Prague
0 Lsol 1
z1
sol 2
z2
q1, 1 q2, 2
… sol i
zi
qi, i
…
z0
q0, 0 = 0
…
20Lq
qi
L
qi
Structural quadrupole allows to reduce strengths of compensating quadrupoles additionally
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The optical transparency scheme of coupling compensation
are angles between quadrupole normal and vertical accelerator axis 45ixBG yi / is quadrupole gradient ][m,/ -2BGk ii
LS, m L1, m L2, m L, m
0,55 0,5 1,0 0,15
B||, T k1, m-2 k2, m-2 G1, T/m G2, T/m G0, T/m
/4 2,5 0,2 0,2 3,9 3,9 14,7
/2 5 0,46 0,4 9,0 7,8 14,7
is the structural defocusing quadrupoleG0 -2
0 m ,750k
Yu. Filatov et al., Polarized Proton Beam Acceleration at Nuclotron with the use of the Polarized Proton Beam Acceleration at Nuclotron with the use of the Solenoid Siberian SnakeSolenoid Siberian Snake, SPIN-Praha 2013, July 7- 13, 2013, Prague
Ekin= 5 GeV
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Summary & Outlook
The class of optical transparency schemes for solenoidal inserts is presented. Usage of structural quadrupole allows to reduce strengths of compensating quadrupoles additionally. Such inserts do not change orbital characteristics of the Nuclotron.
Partial Siberian Snakes open possibility to use Nuclotron as the polarized protons injector for NICA collider and for fix target experiments too.
Similar schemes of partial Siberian Snake can be used to preserve proton polarization in the Booster.
Yu. Filatov et al., Polarized Proton Beam Acceleration at Nuclotron with the use of the Polarized Proton Beam Acceleration at Nuclotron with the use of the Solenoid Siberian SnakeSolenoid Siberian Snake, SPIN-Praha 2013, July 7- 13, 2013, Prague
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