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Spin Tune as function of snake orbital angle March 31, 2009

Spin Tune as function of snake orbital angle March 31, 2009. Mei, Vadim, Thomas. Orbit angle in snakes. 300 murad angle -> 0.046 spin tune shift at 250 GeV. APEX: ramp 1. operation. APEX: ramp 2. Snake angle in present operation.

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Spin Tune as function of snake orbital angle March 31, 2009

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  1. Spin Tune as function of snake orbital angleMarch 31, 2009 Mei, Vadim, Thomas

  2. Orbit angle in snakes 300 murad angle -> 0.046 spin tune shift at 250 GeV APEX: ramp 1 operation APEX: ramp 2

  3. Snake angle in present operation At 9 o’clock the zero orbit angle at snake location leads to few mm excursion at a neighboring location. In both rings.

  4. Spin tune shifts Due to rotators at snakes. Strong energy dependence. Spin tune shift due to snakes: energy dependence (Waldo’s calculations)

  5. At injection With no change of snake angle With -0.3mrad change of snake angle With -0.3mrad change of snake angle With no and -0.3mrad change of snake angle With 0.3mrad change of snake angle With no change of snake angle

  6. At Store: pp93, snake angle -0.3 mrad

  7. Polarization transmission w.r.t. snk angle

  8. Conclusions • Indication of Blue spin tune at injection is further away from 1/2 with no change of snake orbital angle • -0.3mrad snake angle at injection in Blue seems to push the spin tune either close or further away from 1/2 • +-0.3mrad snake orbital angle change along the ramp: • Yellow shows difference in polarization transmission • Difference in Blue is not so clear . Spin tune close to ½ (?).

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