Forward Neutron Asymmetry Persists at 410 Ge V

Forward Neutron Asymmetry Persists at 410 Ge. V 10/22/2021 J. Lajoie - RHIC Machine-Expt. Meeting 1

PHENIX DAQ Hours Average 7. 8 DAQ hrs/day 38 DAQ hours in the previous week (6/1 – 6/7) 57 DAQ hours 5/24 -5/31 days since April 17 th 10/22/2021 J. Lajoie - RHIC Machine-Expt. Meeting 2

200 Ge. V pp Integrated Luminosity (6/7/05) PHENIX Goal 5. 5 pb-1 live BBCLL 1 (45% pol. ) June 25, 2005 5. 81 pb-1 live ZDCLL 1 (3. 48 pb-1 projected, 3. 31 pb-1 with transverse running ) 2. 48 pb-1 live BBCLL 1 55. 8 B BBCLL 1 events sampled 10/22/2021 J. Lajoie - RHIC Machine-Expt. Meeting 3

200 Ge. V pp “Figure of Merit” (6/7/05) PHENIX Goal 226 nb-1 June 25, 2005 (216 nb-1 projected, 204 nb-1 with transverse running ) 140 nb-1 10/22/2021 J. Lajoie - RHIC Machine-Expt. Meeting 4

Average Polarization (6/7/05) 205 Ge. V development 10/22/2021 J. Lajoie - RHIC Machine-Expt. Meeting 5

Transverse component in x-y region. (LR) BLUE (AN = 6. 24%) commissioning (LR) YELLOW (AN = 5. 27%) commissioning PHYSICS run (TB) Transverse component is systematically remaining radial component. Vertical component seems ~ 0. (SPIN rotator and SNAKE are not changed…) 10/22/2021 J. Lajoie - RHIC Machine-Expt. Meeting 6

Plan for Transverse Running • PHENIX needs ~0. 1 pb-1 sampled transverse luminosity to limit the systematic effect of ATT on the ALL measurement – Currently we are integrating luminosity at 0. 055 nb-1 per day – Less than three days of running required – Polarization can be transverse (vertical), do not require radial! • Want to limit the effect on longitudinal running! – Switch to transverse running for STAR and PHENIX following June 13 th beam experiments – Run until PHENIX has 0. 1 pb-1 sampled – Agreement with STAR to limit running to < 60 hours (morning of June 16 th) 10/22/2021 J. Lajoie - RHIC Machine-Expt. Meeting 7

Run-6? • What does PHENIX want for Run-6? – The collaboration needs to discuss this in light of new results from both the Cu. Cu and pp portions of Run-5 • Natural timescale for this is after the summer conferences – PHENIX would benefit from a longer shutdown • TOF-W installation, HBD engineering run • Support within PHENIX for a long pp run – Strong interest in running with radial polarization to study Sivers effect • Ask CAD to keep this in mind while planning for Run-6 – Strong interest in a pp run at 62. 4 Ge. V • Reference dataset for RAA measurements 10/22/2021 J. Lajoie - RHIC Machine-Expt. Meeting 8