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AGS Cold Snake Status and Plan

AGS Cold Snake Status and Plan. Haixin Huang. August 18, 2005 RSC meeting. New Equipments/Applications. Added compensation quads for warm snake. Rearranged the compensation quads scheme for cold snake. Repaired vertical tune quads to push vertical tune high near top energy.

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AGS Cold Snake Status and Plan

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  1. AGS Cold Snake Status and Plan • Haixin Huang August 18, 2005 RSC meeting

  2. New Equipments/Applications • Added compensation quads for warm snake. • Rearranged the compensation quads scheme for cold snake. • Repaired vertical tune quads to push vertical tune high near top energy. • New tune meter which gives both tunes. • Faster DAQ for CNI polarimeter, added 45 degree detectors. Haixin Huang

  3. Cold Snake Timeline • Jan 16: Started Booster and AGS Setup. • Jan 21: Threaded beam through with both snake on at desired current. • Jan. 22-28: Fine tuning the orbit and compensation magnets settings to raise vertical tune into desired tune window. • Jan 24: CNI polarimeter detected carbon events. • Jan. 28: B field scan to compare polarization levels at G=45.5 and 46.5. • Jan. 30: Start extraction setup at G=45.5. Beam is seen at W dump. Haixin Huang

  4. Polarization • Polarization measured as >50% with 6*1010(the intensity used in the field scan). Crank intensity up to 11* 1010 and 44% polarization is measured. • With Booster scraping completely removed, AGS late intensity is about 1.3-1.4* 1011. No polarization measurement with this intensity yet. • Injection polarization measurement gives 75+-5% polarization by E880 polarimeter at injection, consistent with source polarization at the time. Booster should be well corrected. Haixin Huang

  5. B Field Scan Haixin Huang

  6. Vertical Polarization Profile limit of the horizontal resonance effect from 84 horizontal resonances. It is about 5% in the relative scale. Haixin Huang

  7. Vertical Component at C15 Polarimeter (fromJunpei) Vertical component at L20 = -0.992 Vertical component at C15 = -0.952 The ratio of vertical components at C15 and Ext: .952/.992=0.960 CSNK=2.5T WSNK=1.53T

  8. Plan • Extraction setup will continue. • Study the intensity effect from both accelerator and polarimeter aspects. • Continue tune scan at several intrinsic resonances. • Explore the possibility to put horizontal tune close to integer (not a short term project). Haixin Huang

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