Multiple Partial Siberian Snakes

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Multiple Partial Siberian Snakes

Presentation transcript:

Multiple Partial Siberian Snakes in the AGS Junpei Takano

RHIC Solenoidal snake for imperfection res. but produce coupling res. Absolute Polarimeter (H jet) RHIC pC Polarimeters Superconducting Siberian Snakes BRAHMS & PP2PP (p) RHIC Superconducting Siberian Snakes PHENIX (p) STAR (p) Spin Rotators Solenoidal snake for imperfection res. but produce coupling res. Achieved P=40% in 2003 LINAC BOOSTER Pol. Proton Source 500 mA, 300 ms AGS 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

Injection Extraction Snake strength has energy dependence

Double snake scheme Merit 1: large spin tune gap 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

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

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

Without Warm Snake (Cold Snake only) With 8% Warm Snake (Double snake) vert comp Pol. at injection 1.000 80.00 5 0.997 79.75 10 0.988 79.02 15 0.972 77.79 20 0.951 76.09 25 0.924 73.91 30 0.891 71.28 Cold snake% vert comp Pol at injection 0.992 79.37 5 0.999 79.91 10 79.96 15 0.994 79.52 20 0.982 78.58 25 0.965 77.17 30 0.941 75.27 Snake strength at “injection” energy

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 )

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

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

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

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.