AGS pp Status Jan. 13, 2015 Time Meeting Haixin Huang.

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AGS pp Status Jan. 13, 2015 Time Meeting Haixin Huang

2 Timeline l Dec : Booster setup. l Dec : AGS setup with Westinghouse. No snake machine. l Jan. 2: switching to Siemens in the morning, setup AGS first without snakes, then with snakes. l Jan.3-4: Instrumentation (tunemeter, IPM, eIPM, polarimeter, JQ) setup. l Jan. 5-6: Confirmed spin flip signal in AGS user4 so we got polarization around 60%. l Jan.7-9: setup Booster RF with dual harmonics. Leave dual harmonics in the Booster since Jan. 9 night. Ring access on Jan. 8 fixed the F10 beam pipe problem. l Jan : setup JQ timing. It seems that the jump quads timing should be earlier than the prediction. Take measurements for polarization profile and intensity scan. l Jan.13: source maintenance, setup Au for RHIC p-A aperture check later.

Haixin Huang 3 Status l Dual harmonic RF setup has been tested in the Booster. With the h=2 cavity on for longer time (120ms), the beam seems brighter at extraction (same beam size, but more intensity). It has been used since last Friday. l Keith has taken another intensity scan (varying Booster input and checking MW006 beam size). l Several JQ timing files have been tried. It seems that the timing needs to be earlier by 0.5ms from the timing derived from energy and tune measurements. Polarization is in the low 70% with 2*10 11 intensity. l Benefit of JQ is seen: JQ on: ; JQ off ; ratio: Intensity was 1.5* l Some polarization profile measurements are done. At 2*10 11, R x = , R y = l Source maintenance today and AGS eIPM repair work is also done today.

F10 Beam Asymmetric Beam Pipe Haixin Huang 4 When we started AGS setup, a large BLM reading occurred at F12. A radial move of 15mm is required to get rid of the beam loss. A ring access was made last Thursday. It turned out that the beam pipe was asymmetric and was not installed in the correct orientation. Radiation survey also confirmed the hot spot. It was repositioned and the beam aperture problem went away.

Booster Dual Harmonic RF Cavity Haixin Huang 5 Yellow: Intensity Red: h=2 voltage Almost no loss with h=2 on.

Booster Mountain Range Haixin Huang 6 H=2 is off

Booster Longitudinal Profile Haixin Huang 7 The higher peak is with h=2 on.

AGS Flattop Vertical Polarization Profile Haixin Huang 8

AGS Flattop Horizontal Polarization Profile Haixin Huang 9

AGS Polarization Intensity Scan Haixin Huang 10 We did not scan to 3*10 11 in run13. At 3*10 11, extrapolation from run13 (up to 2.2*10 11 ) is 62%.