1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Phase variation for snake matching in the EIC's HSR

WEPM004
4 Jun 2025, 16:00
2h
Exhibiton Hall A _Magpie (TWTC)

Exhibiton Hall A _Magpie

TWTC

Poster Presentation MC5.D01 Beam Optics Lattices, Correction Schemes, Transport Wednesday Poster Session

Speaker

Eiad Hamwi (Cornell University (CLASSE))

Description

The Hadron Storage Ring of the Electron-Ion Collider will feature 6 Siberian snakes placed at the start of each arc to coherently cancel spin precession from diametrically opposite arcs in the ring. To avoid spin-orbital resonances, the alternating sum of the rotation axes of all snakes is 90 degrees, ensuring the closed-orbit spin tune is ½ and sufficiently far away from betatron tunes and integer tunes. This choice does not account for amplitude-dependent spin tune shift, which introduces high-order spin orbit resonances in the vicinity of strong first-order resonances. By varying betatron phase advances across each of the 6 arcs, we minimize the strength of first-order spin-orbit resonances as well as ADST shift. In the case of uncooled helium-3, we find it is necessary to minimally vary the vertical orbital tune as well but are able to completely avoid depolarization throughout the ramp with time-dependent phase advances.

Funding Agency

This work has been supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy, and No. DE-SC0018008.

Region represented America
Paper preparation format LaTeX

Author

Eiad Hamwi (Cornell University (CLASSE))

Co-authors

Georg Hoffstaetter (Cornell University (CLASSE)) Haixin Huang (Brookhaven National Laboratory)

Presentation materials

There are no materials yet.