Polarized Proton Beam Acceleration at Nuclotron with the use of the Solenoid Siberian Snake

1

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)

2

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

3

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

14

5 16

14

12

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.


4

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

5

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=)


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

6

Conventional coupling compensation scheme


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:

77

Coupling Compensation

0 Lsol 1

z1

sol 2

z2

q1, 1 q2, 2

… sol i

zi

qi, i

…


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

88

Coupling Compensation(section with one structural quadrupole)


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

9

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


Ekin= 5 GeV

10

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.


Thank you for your attention!

Polarized Proton Beam Acceleration at Nuclotron with the use of the Solenoid Siberian Snake

Documents

Transcript of Polarized Proton Beam Acceleration at Nuclotron with the use of the Solenoid Siberian Snake