TY - CONF AU - Filatov, Y. AU - Kondratenko, A.M. AU - Kondratenko, M.A. AU - Kovalenko, A.D. AU - Vinogradov, S.V. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Spin Resonance Strength in the Transparent Spin Mode of the NICA Collider J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - To implement the polarization program at the NICA complex (Dubna, Russia) the novel mode of ion polarization control - the transparent spin mode - is planned to use. To set up the transparent spin mode in the NICA collider two solenoidal snakes will be placed in straights of the Multi Purpose Detector (MPD) and the Spin Physics Detector (SPD). The beam polarization at SPD will be controlled by means of ‘‘weak’’ solenoids. The main characteristic of the transparent spin mode is the spin resonance strength, which consists of two parts: a coherent part arising due to additional transverse and longitudinal fields on the beam trajectory deviating from the design orbit and an incoherent part associated with the particles’ betatron and synchrotron oscillations (beam emittances). The resonance strength allows one to formulate requirements on the magnitudes of the control solenoids’ fields. The theoretical analysis, calculation and spin tracking simulation of the spin resonance strength in the whole momentum range of the NICA collider are presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 656 EP - 658 KW - polarization KW - solenoid KW - resonance KW - proton KW - collider DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB041 UR - http://jacow.org/ipac2019/papers/moprb041.pdf ER - TY - CONF AU - Morozov, V.S. AU - Adams, P. AU - Derbenev, Y.S. AU - Filatov, Y. AU - Huang, H. AU - Kondratenko, A.M. AU - Kondratenko, M.A. AU - Lin, F. AU - Méot, F. AU - Ptitsyn, V. AU - Schmidke, W.B. AU - Zhang, Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - EXPERIMENTAL VERIFICATION OF TRANSPARENT SPIN MODE IN RHIC J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - High electron and ion polarizations are some of the key design requirements of a future Electron Ion Collider (EIC). The transparent spin mode, a concept inspired by the figure 8 ring design of JLEIC, is a novel technique for preservation and control of electron and ion spin polarizations in a collider or storage ring. It makes the ring lattice "invisible" to the spin and allows for polarization control by small quasi-static magnetic fields with practically no effect on the beam’s orbital characteristics. It offers unique opportunities for polarization maintenance and control in Jefferson Lab’s JLEIC and in BNL’s eRHIC. The transparent spin mode has been demonstrated in simulations and we now plan to test it experimentally. We present a design of an experiment using a polarized proton beam stored in one of the RHIC rings. In the experiment, one of the RHIC rings is configured in the transparent spin mode by aligning the axes of its two Siberian snakes. The experiment goals, procedures, hardware requirements and expected results are presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2783 EP - 2786 KW - polarization KW - collider KW - controls KW - experiment KW - resonance DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW122 UR - http://jacow.org/ipac2019/papers/wepgw122.pdf ER - TY - CONF AU - Morozov, V.S. AU - Adams, P. AU - Derbenev, Y.S. AU - Filatov, Y. AU - Huang, H. AU - Kondratenko, A.M. AU - Kondratenko, M.A. AU - Lin, F. AU - Méot, F. AU - Ptitsyn, V. AU - Schmidke, W.B. AU - Zhang, Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Spin Response Function for Spin Transparency Mode of RHIC J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In the Spin Transparency (ST) mode of RHIC, the axes of its Siberian snakes are parallel. The spin tune in the ST mode is zero and the spin motion becomes degenerate: any spin direction repeats every particle turn. In contrast, the lattice of a conventional collider determines a unique stable periodic spin direction, so that the collider operates in the Preferred Spin (PS) mode. Contributions of perturbing magnetic fields to the spin resonance strengths in the PS mode are usually calculated using the spin response function. However, in that form, it is not applicable in the ST mode. This paper presents a response function formalism expanded for the ST mode of operation of conventional colliders with two identical Siberian snakes in the highly-relativistic limit. We present calculations of the spin response function for RHIC in the ST mode. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2791 EP - 2793 KW - resonance KW - collider KW - polarization KW - controls KW - lattice DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW124 UR - http://jacow.org/ipac2019/papers/wepgw124.pdf ER -