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Title: RHIC polarized proton operation for 2017

Authors:
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Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1361253
Report Number(s):
BNL-113472-2017-CP
R&D Project: KBCH139; 18031; KB0202011
DOE Contract Number:
SC00112704
Resource Type:
Conference
Resource Relation:
Conference: 8th International Particle Accelerator Conference (IPAC17); Bella Center, Copenhagen, Denmark; 20170514 through 20170519
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Ranjbar V. H., Adams, P., Altinbas, Z., Aschenauer, E. C., Atoian, G., Beebe, E., Binello, S., Blackler, I., Blaskiewicz, M., Brennan, J. M., Brown, K. A., Bruno, D., Costanzo, M., D Ottavio, T., Drees, K. A., Fedotov, A. V., Fischer, W., Gardner, C. J., Gassner, D. M., Gu, X., Harper, C., Harvey, M., Hayes, T., Hock, J., Huang, H., Hulsart, R., Jamilkowski, J., Kanesue, T., Kling, N. A., van Kuik, B., Laster, J. S., Liu,C., Luo, Y., Maffei, D., Mapes, M., Marr, G. J., Marusic, A., Meot, F., Mernick, K., Michnoff, R., Miller, T. A., Minty, M., Montag, C., Morris, J., Narayan, G., Naylor, C., Nemesure, S., Okamura, M., Perez, S., Pikin, A. I., Poblaguev, A., Polizzo, S., Ptitsyn, V., Raparia, D., Robert-Demolaize, G., Roser, T., Sandberg, J., Schmidke, W. B., Schoefer, V., Severino, F., Shrey, T., Smith, K., Steski, D., Tepikan, S., Than, R., Thieberger, P., Tuozzolo, J., Wang, G., Yip, K., Zaltsman, A., Zelenski, A., Zeno, K., Zhang, W., Oddo, P., Sorell, Z., and Dyer, P. RHIC polarized proton operation for 2017. United States: N. p., 2017. Web.
Ranjbar V. H., Adams, P., Altinbas, Z., Aschenauer, E. C., Atoian, G., Beebe, E., Binello, S., Blackler, I., Blaskiewicz, M., Brennan, J. M., Brown, K. A., Bruno, D., Costanzo, M., D Ottavio, T., Drees, K. A., Fedotov, A. V., Fischer, W., Gardner, C. J., Gassner, D. M., Gu, X., Harper, C., Harvey, M., Hayes, T., Hock, J., Huang, H., Hulsart, R., Jamilkowski, J., Kanesue, T., Kling, N. A., van Kuik, B., Laster, J. S., Liu,C., Luo, Y., Maffei, D., Mapes, M., Marr, G. J., Marusic, A., Meot, F., Mernick, K., Michnoff, R., Miller, T. A., Minty, M., Montag, C., Morris, J., Narayan, G., Naylor, C., Nemesure, S., Okamura, M., Perez, S., Pikin, A. I., Poblaguev, A., Polizzo, S., Ptitsyn, V., Raparia, D., Robert-Demolaize, G., Roser, T., Sandberg, J., Schmidke, W. B., Schoefer, V., Severino, F., Shrey, T., Smith, K., Steski, D., Tepikan, S., Than, R., Thieberger, P., Tuozzolo, J., Wang, G., Yip, K., Zaltsman, A., Zelenski, A., Zeno, K., Zhang, W., Oddo, P., Sorell, Z., & Dyer, P. RHIC polarized proton operation for 2017. United States.
Ranjbar V. H., Adams, P., Altinbas, Z., Aschenauer, E. C., Atoian, G., Beebe, E., Binello, S., Blackler, I., Blaskiewicz, M., Brennan, J. M., Brown, K. A., Bruno, D., Costanzo, M., D Ottavio, T., Drees, K. A., Fedotov, A. V., Fischer, W., Gardner, C. J., Gassner, D. M., Gu, X., Harper, C., Harvey, M., Hayes, T., Hock, J., Huang, H., Hulsart, R., Jamilkowski, J., Kanesue, T., Kling, N. A., van Kuik, B., Laster, J. S., Liu,C., Luo, Y., Maffei, D., Mapes, M., Marr, G. J., Marusic, A., Meot, F., Mernick, K., Michnoff, R., Miller, T. A., Minty, M., Montag, C., Morris, J., Narayan, G., Naylor, C., Nemesure, S., Okamura, M., Perez, S., Pikin, A. I., Poblaguev, A., Polizzo, S., Ptitsyn, V., Raparia, D., Robert-Demolaize, G., Roser, T., Sandberg, J., Schmidke, W. B., Schoefer, V., Severino, F., Shrey, T., Smith, K., Steski, D., Tepikan, S., Than, R., Thieberger, P., Tuozzolo, J., Wang, G., Yip, K., Zaltsman, A., Zelenski, A., Zeno, K., Zhang, W., Oddo, P., Sorell, Z., and Dyer, P. Sun . "RHIC polarized proton operation for 2017". United States. doi:. https://www.osti.gov/servlets/purl/1361253.
@article{osti_1361253,
title = {RHIC polarized proton operation for 2017},
author = {Ranjbar V. H. and Adams, P. and Altinbas, Z. and Aschenauer, E. C. and Atoian, G. and Beebe, E. and Binello, S. and Blackler, I. and Blaskiewicz, M. and Brennan, J. M. and Brown, K. A. and Bruno, D. and Costanzo, M. and D Ottavio, T. and Drees, K. A. and Fedotov, A. V. and Fischer, W. and Gardner, C. J. and Gassner, D. M. and Gu, X. and Harper, C. and Harvey, M. and Hayes, T. and Hock, J. and Huang, H. and Hulsart, R. and Jamilkowski, J. and Kanesue, T. and Kling, N. A. and van Kuik, B. and Laster, J. S. and Liu,C. and Luo, Y. and Maffei, D. and Mapes, M. and Marr, G. J. and Marusic, A. and Meot, F. and Mernick, K. and Michnoff, R. and Miller, T. A. and Minty, M. and Montag, C. and Morris, J. and Narayan, G. and Naylor, C. and Nemesure, S. and Okamura, M. and Perez, S. and Pikin, A. I. and Poblaguev, A. and Polizzo, S. and Ptitsyn, V. and Raparia, D. and Robert-Demolaize, G. and Roser, T. and Sandberg, J. and Schmidke, W. B. and Schoefer, V. and Severino, F. and Shrey, T. and Smith, K. and Steski, D. and Tepikan, S. and Than, R. and Thieberger, P. and Tuozzolo, J. and Wang, G. and Yip, K. and Zaltsman, A. and Zelenski, A. and Zeno, K. and Zhang, W. and Oddo, P. and Sorell, Z. and Dyer, P.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun May 14 00:00:00 EDT 2017},
month = {Sun May 14 00:00:00 EDT 2017}
}

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  • The first part of RHIC Run 15 consisted of ten weeks of polarized proton on proton collisions at a beam energy of 100 GeV at two interaction points. In this paper we discuss several of the upgrades to the collider complex that allowed for improved performance. The largest effort consisted in commissioning of the electron lenses, one in each ring, which are designed to compensate one of the two beam-beam interactions experienced by the proton bunches. The e-lenses raise the per bunch intensity at which luminosity becomes beam-beam limited. A new lattice was designed to create the phase advances necessarymore » for a beam-beam compensation with the e-lens, which also has an improved off-momentum dynamic aperture relative to previous runs. In order to take advantage of the new, higher intensity limit without suffering intensity driven emittance deterioration, other features were commissioned including a continuous transverse bunch-by-bunch damper in RHIC and a double harmonic RF cature scheme in the Booster. Other high intensity protections include improvements to the abort system and the installation of masks to intercept beam lost due to abort kicker pre-fires.« less
  • With the updated multipole magnet field errors in the interaction regions (IRs), detailed dynamic aperture studies are carried out around the current RHIC polarized proton (pp) working point. The beam parameters and {beta}*s are similar to those proposed for the next pp run. The effects on the dynamic apertures from nonlinear corrections, such as multipole field error correction in the IRs, second order chromaticity correction and horizontal third order resonance correction are evaluated. The sextupole components in the arc dipoles and the observed tune ripples are also considered.
  • The Relativistic Heavy Ion Collider (RHIC) operation as the polarized proton collider presents unique challenges since both luminosity(L) and spin polarization(P) are important. With longitudinally polarized beams at the experiments, the figure of merit is LP{sup 4}. A lot of upgrades and modifications have been made since last polarized proton operation. A 9 MHz rf system is installed to improve longitudinal match at injection and to increase luminosity. The beam dump was upgraded to increase bunch intensity. A vertical survey of RHIC was performed before the run to get better magnet alignment. The orbit control is also improved this year.more » Additional efforts are put in to improve source polarization and AGS polarization transfer efficiency. To preserve polarization on the ramp, a new working point is chosen such that the vertical tune is near a third order resonance. The overview of the changes and the operation results are presented in this paper. Siberian snakes are essential tools to preserve polarization when accelerating polarized beams to higher energy. At the same time, the higher order resonances still can cause polarization loss. As seen in RHIC, the betatron tune has to be carefully set and maintained on the ramp and during the store to avoid polarization loss. In addition, the orbit control is also critical to preserve polarization. The higher polarization during this run comes from several improvements over last run. First we have a much better orbit on the ramp. The orbit feedback brings down the vertical rms orbit error to 0.1mm, much better than the 0.5mm last run. With correct BPM offset and vertical realignment, this rms orbit error is indeed small. Second, the jump quads in the AGS improved input polarization for RHIC. Third, the vertical tune was pushed further away from 7/10 snake resonance. The tune feedback maintained the tune at the desired value through the ramp. To calibrate the analyzing power of RHIC polarimeters at any energy above injection, the polarized hydrogen jet target runs for every fill with both beams. Based on the known analyzing power, there is very little polarization loss between injection and 100 GeV. An alternative way is to measure the asymmetry at 100 GeV followed by ramping up to 250 GeV and back down to 100 GeV and then to measure the asymmetry again at 100 GeV. If the asymmetry after the down ramp is similar to the measurement before the up ramp, polarization was also preserved during the ramp to 250 GeV. The analyzing power at storage energy can then be extracted from the asymmetries measured at 100 GeV and 250 GeV. The tune and orbit feedbacks are essential for the down ramp to be possible. The polarized proton operation is still going on. We will push bunch intensity higher until reaching the beam-beam limit. The even higher intensity will have to wait for the electron lenses to compensate the beam-beam effect. To understand the details of spin dynamics in RHIC with two snakes, spin simulation with the real magnet fields have been developed recently. The study will provide guidance for possible polarization loss schemes. Further polarization gain will requires a polarized source upgrade; more careful setup jump quads in the AGS to get full benefit; and control emittance in the whole accelerator chain.« less
  • Polarized proton beams have been accelerated, stored and collided at 100GeV per beam in the Relativistic Heavy Ion Collider (RHIC) with longitudinal polarization. The essential equipment includes four Siberian snakes, eight spin rotators and fast relative polarimeters in each of the two RHIC rings as well as local polarimeters at the STAR and PHENIX detectors. This paper summarizes the performance of RHIC as a polarized proton collider in the FY03 run with emphasis on polarization issues. Preliminary data from the FY04 run is also shown.