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Multiple Partial Siberian Snakes in the AGS

Multiple Partial Siberian Snakes in the AGS. Junpei Takano. PHENIX (p). Absolute Polarimeter (H jet). RHIC pC Polarimeters. Superconducting Siberian Snakes. BRAHMS & PP2PP (p). RHIC. Superconducting Siberian Snakes. STAR (p). Spin Rotators. Solenoidal snake for imperfection res.

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Multiple Partial Siberian Snakes in the AGS

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  1. Multiple Partial Siberian Snakes in the AGS Junpei Takano

  2. PHENIX (p) Absolute Polarimeter (H jet) RHIC pC Polarimeters Superconducting Siberian Snakes BRAHMS & PP2PP (p) RHIC Superconducting Siberian Snakes STAR (p) Spin Rotators Solenoidal snake for imperfection res. but produce coupling res. Achieved P=40% in 2003 LINAC BOOSTER AGS Pol. Proton Source 500 mA, 300 ms Warm snake for imperfection res. Reduced coupling res. Achieved P=50% in 2004 and P=55% in 2005 Cold snake for imperfection res. and intrinsic res. Achieved P=65% in 2006 with Warm snake

  3. Injection Extraction Snake strength has energy dependence

  4. Double snake scheme to RHIC from Booster AGS 120° A20:CSNK E20:WSNK ← Spin tune Eq. for “single” snake ↓ Spin tune Eq. for “double” snake : CSNK strength Merit 1: large spin tune gap Merit 2: small spin mismatch : WSNK strength

  5. Spin tune around first intrinsic resonance with 2 snakes 12k±νy (νy = 8.9) Large spin tune gap = 3m WSNK=8.4% CSNK=15% Injection energy

  6. CSNK@A20=20%,WSNK@E20=8% inj ext inj CSNK WSNK Spin mismatch

  7. Without Warm Snake (Cold Snake only) With 8% Warm Snake (Double snake) Snake strength at “injection” energy

  8. If the SSNK is relocated from I10 to I20.... Spin tune gap will be larger. SSNK I20←I10 to RHIC from Booster AGS A20:CSNK E20:WSNK ( ) : CSNK strength : WSNK strength : SSNK strength

  9. Spin tune around first intrinsic resonance with 3snakes Large spin tune gap CSNK=16% WSNK=8% SSNK= 10%

  10. Spin mismatch with 3snakes CSNK=15%,WSNK=8%,SSNK=-7% inj ext inj CSNK WSNK SSNK No spin mismatch

  11. Red: 10%CSNK+6%WSNK Blue: 6%CSNK+6%WSNK Result in RUN6

  12. Summary The triple snake scheme was simulated. ・Larger spin tune gap ・No spin mismatch 6%CSNK+6%WSNK was operated. Achieved same level polarization to 10%CSNK +6%WSNK If the 6%+6% machine is optimized, the polarization might be improved.

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