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APEX Report: March 17-18, 2009

APEX Report: March 17-18, 2009. Fulvia Pilat Time Meeting, March 24, 2009. APEX Schedule March 17-18 2009. Injection PP93 12 bunches vary bunch intensity 56 bunches  ramp BBQ. Store PP93 6x6 ramp Anti-cogged. Store PP93 6x6 ramp. Store rot93 12x12 ramp BBQ. OPERATIONS

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APEX Report: March 17-18, 2009

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  1. APEX Report:March 17-18, 2009 Fulvia Pilat Time Meeting, March 24, 2009

  2. APEX Schedule March 17-18 2009 Injection PP93 12 bunches vary bunch intensity 56 bunches  ramp BBQ Store PP93 6x6 ramp Anti-cogged Store PP93 6x6 ramp Store rot93 12x12 ramp BBQ OPERATIONS Non-linear chromaticity corrections Luo, Demolaize 08-29, 08-10 Polarimeter study polarization Emittance Huang, Zelenski Sivertz Gill +team Prerequisite for 09-05 and other studies OPERATIONS ORM Satogata 08-27 Optics, beta* measurements Bai OPERATIONS IR nonlinear corrections Pilat 09-19 BBQ, BTF calibration Minty, Fischer 11pm 1:30am 3:30am 4:30am 5am 6am 7am AGS off

  3. Zelenski presentation (APEX, RSC)

  4. Horizontal (Yellow-2) emittance measurements vs. bunch intensity

  5. Polarization vs. bunch intensity in RHIC

  6. Horizontal emittance in yellow at store: 6.5 p Beam width-0.32 mm Horizontal emittance in Blue: 8.7 p Sigma-1.14 mm

  7. Small emittances in RHIC Linac injector upgrade reduced emittances from 15 pi to about 5-8 pi. High polarized source intensity allowed to reduce linac pulseduration,which reduces the multiple scattering in the stripping foil. Even with short linac pulse, the beam intensity is sufficient to use vertical scraping in Booster (about 50%) to reduce vertical (and in less extent horizontal) beam emittances. It looks like the present AGS setup doesn’t blow-out the emittances. Small emittances in AGS helps to reduce depolarization. It was demonstrated that for a number of RHIC fills there is no emittance growth during the acceleration (at least at moderate bunch intensity).

  8. Tune ripple at store ~0.01 tune ripple at store observed on BBQ at store in ops Use AC quad to apply known (2Hz) modulation to check BBQ • 2 Hz (AC dipole) and 10 Hz (triplet vibration) Mar-18-2009 01:35 (2 edits): AC quadrupole is turned on with +/- 10 A amplitude and 2 Hz frequency. Expect 4.5E-3 tune modulation (peak-to-peak) in both planes (due to location in IR4). Observe dQx = 0.7107-0.7059 = 4.8E-3dQy = 0.6793-0.6731 = 6.2E-3Expect also anti-correlation as observed. -Ryoichi, Kevin, Wolfram, Minty

  9. APEX Schedule March 25 2009 Store PP93 109 bunches 0.5x1011 Injection Store rot93 6x6 ramp Store rot93 12x12 ramp BBQ Store rot93 12x12 ramp BBQ Triplet Oscillations measurement Minty, Montag 08-29, 08-10 Polarimeter study Huang, Zelenski Sivertz Gill +team OPERATIONS Non-linear chromaticity corrections Luo, Demolaize 08-27 Optics, beta* measurements Bai 09-05 D0-DX study MacKay BACK 2 PHYSICS OPERATIONS IR nonlinear corrections Pilat 6am 8am 10am noon 3:00pm 5pm 6pm

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