p-c polarimeters at rhic|Proton : supplier For polarization monitoring during Relativistic Heavy Ion Collider (RHIC) polarized proton operation, a fast and reliable polarimeter is required that produces a polariza-tion .
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p‐Carbon Polarimetry at RHIC
The pC-polarimeter detects recoil carbon ions through the proton-carbon elastic scattering reaction and measures rel-ative polarization of polarized proton beam from the left-right .
p‐Carbon Polarimetry at RHIC. The polarization measurement through elastic (p⃗, C) reaction plays a crucial role in the polarized proton beam operation of Relativistic Heavy Ion . Polarimeters using the proton carbon elastic scattering process in Coulomb Nuclear Interference (CNI) region were installed in two RHIC rings. Polarization .The Polarimetry Requirements for RHIC. The polarimeters should operate over a very wide range, The beam energy ranging from injection at 24 to 250 GeV. The physics program requires .
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The pC CNI polarimeters in AGS and RHIC are based on elastic proton scattering with low momentum transfer (CNI region) and measurement of asymmetry in recoil carbon nuclei .
For polarization monitoring during Relativistic Heavy Ion Collider (RHIC) polarized proton operation, a fast and reliable polarimeter is required that produces a polariza-tion .The proton-carbon Coulomb Nuclear Interference (pC CNI) polarimeters, installed in the two RHIC rings, monitored the proton polarization during the beam stores. When the beam was . The RHIC polarimeters detect low-energy recoil carbon ions produced by p+ 12 C elastic scattering reactions at small |t|, where the Coulomb scattering amplitude is comparable . Polarimeters using the proton carbon elastic scattering process in Coulomb Nuclear Interference (CNI) region were installed in two RHIC rings. Polarization .
RHIC pC Polarimeters Absolute Polarimeter (H jet) 2 × 1011 Pol. Protons / Bunch ε = 20 π mm mrad Siberian Snakes PHOBOS (p) Figure 1: Layout of RHIC and injectors for polarized pro-tons. In each of the two RHIC rings (Blue: CW, and Yel-low: CCW) there will be two helical Siberian snakes and four helical spin rotators placed on either side of .
The RHIC polarimeters were operated near themore . (p-C CNI polarimeter) in detail and write a proposal for the test experiment at the AGS, (2) to discuss the related physics, (3) and to discuss other options for the RHIC polarimetry. About twenty people have participated in the workshop and discussed above items and worked for the proposal. The 2005 run (RUN05) was the first extended operation of the polarized RHIC‐pp program. Throughout 3 months of running, polarization measurements were regularly executed every 2 ∼ 3 hours during the beams at storage energy 100GeV using RHIC pC‐polarimeters. Polarimeters using the proton carbon elastic scattering process in Coulomb Nuclear Interference (CNI) region were installed in two RHIC rings. Polarization measurements were successfully carried out with the high energy polarized proton beams for the first polarized pp collision run.
This year polarimeters of 6 silicon detectors each are to work in both rings to ensure RHIC polarized beam collisions. . (p,p)12C. If it works at RHIC environment, a major advantage will be the .The pC CNI polarimeters at RHIC provide fast, polar-ization and polarization pro le measurements. It can also measure beam pro le, but the quality of beam pro le de-pends on the target sti ness. The analyzing power of this polarimeter has been calibrated by .RHIC pC CNI Polarimeter: Experimental Setup and Physics Results . Measurement of the inclusive p-C analyzing power and cross section in the 1 GeV region and calibration of the new polarimeter POMME . of the dedicated CP675, Spin 2002: 15th Int'l. Spin Physics Symposium and Workshop on Polarized Electron Sources and Polarimeters, edited by Y .
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WFD Version 9 Programming Guide (used in pC polarimeters in RHIC and AGS) WFD Version 10 Programming Guide (used in H-Jet polarimeter) Silicon Detectors Reference BNL 2 mm strips These are the standard detectors used for CNI polarimetry at BNL manufactured by the BNL instrumentation group. Detectors have 12 silicon strips of 2 mm width and 10 .
N, yet with less statistical abundance compared to pC polarimeters, i.e. ∆PH−Jet/PH−Jet ∼5% in 1 to 2 days (as of Run06). Such a self calibrated manner wouldn’t be applied for pC polarimeters, they are nor-malized against the H-Jet polarimeter by running the pC and the H-Jet polarimeters for the same period.
2. The CNI Polarimeters The recoil carbon nuclei from the elastic process, p+C-+ p+C, are detected with silicon strip detectors (SSD) located at 90 degrees to the beam direction, which cover the kine matic acceptance for the entire RHIC momentum range from injection (24.3 GeV /c) to the storage energy (lOOGeV /c, 250 GeV /c).
A new polarimeter has been developed using proton carbon elastic scattering in CNI region at RHIC. Polarization measurements were successfully carried out with the high energy polarized pp collision run in 2001/2002 winter. The experimental setup, performance, and the general status of the polarimeters are presented. A polarized hydrogen jet target will be installed at an intersection point in RHIC in the next few years to make an absolute measurement of the proton beam polarizations possible. We discuss here a procedure to measure the p‐C analyzing power A p‐C in the Coulomb‐nuclear interference region at beam energies between injection energy and . During the 2003 run at the Relativistic Heavy Ion Collider (RHIC), polarimeters were used to provide fast, reliable measurements of proton beam polarization both in the RHIC rings and in the .bon PRun05 pC and the hydrogen PRun05 H−Jet polarimeters. The improved analyzing power of Run05 ARun05 N is given by ARun05 N = A Run04 N PRun05 pC PRun05 H−Jet. (1.1) The curves in the Fig. 1.1 are the model predictions[9] of with and without the spin-flip amplitude fitted to the data. The analyzing power for the elastic polarized proton-3
and RHIC machine parameters is required to eliminate residual depolarization (introduced for example by the snake itself). Therefore, fast polarization measurements are absolutely essential for the machine setup and physics programs during the physics stores. The pC CNI polarimeters in AGS and RHIC are basedPolarimeters based on p-Carbon elastic scattering in the Coulomb Nuclear Interference(CNI) region has been used. Two polarimeters are installed in each of the two collider rings and they are capable to provide important polarization pro le information. The polarimeter also provides valuable information for polarization loss on the energy ramp .
RHIC pC Polarimeters Absolute Polarimeter (H jet) 2 × 1011 Pol. Protons / Bunch ε = 20 π mm mrad Siberian Snakes PHOBOS (p) Figure 1: Layout of RHIC and injectors for polarized pro-tons. In each of the two RHIC rings (Blue: CW, and Yel-low: CCW) there will be two helical Siberian snakes and four helical spin rotators placed on either side of . The spin structure of the proton has revealed itself to be extremely complex and is an area of ongoing research. The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL . A new polarimeter has been developed using proton carbon elastic scattering in CNI region at RHIC. Polarization measurements were successfully carried out with the high energy polarized pp collision run in 2001/2002 winter. The experimental setup, performance, and the general status of the polarimeters are presented.
The cross section and transverse single-spin asymmetries of μ− and μ+ from open heavy-flavor decays in polarized p+p collisions at s=200 GeV were measured by the PHENIX experiment during 2012 . For example, at RHIC two types of polarimeter are used to perform proton beam polarization measurements. One of them, the p-Carbon polarimeter [456], uses carbon fibers as the scattering target .The Polarimetry Requirements for RHIC The polarimeters should operate over a very wide range, The beam energy ranging from injection at 24 to 250 GeV The physics program requires precision polarimetry < 5% Polarimeter calibration is required at each energy Beam polarization profile Polarization lifetime or decay during a store Polarization measurement on the ramp The RHIC polarimeters were operated near the limit of the counting rate for present silicon strip detectors. The ongoing polarimeter upgrade for the 2009 run will address all these problems. The upgrade should allow significant reduction of the polarization measurement errors by making feasible the complete polarization measurements, which .
The polarization measurement through elastic (p⃗, C) reaction plays a crucial role in the polarized proton beam operation of Relativistic Heavy Ion collider at Brookhaven National Laboratory. As well as measuring the polarization, the unknown analyzing power A N of elastic (p⃗, C) is determined as well in combination with the absolute polarization meausement by a H‐jet . The polarized hydrogen Jet target at RHIC continues its mission to provide absolute calibration for the polarized proton beam polarimeters at RHIC. Data were collected at incoming beam momenta of .
The 2005 run (RUN05) was the first extended operation of the polarized RHIC‐pp program. Throughout 3 months of running, polarization measurements were regularly executed every 2 ∼ 3 hours during the beams at storage energy 100GeV using RHIC pC‐polarimeters. These measurements were performed under different beam conditions, i.e., intensity, .
The RHIC polarized proton collider polarimeters employ the analyzing power in p‐Carbon elastic scattering in the Coulomb Nuclear Interference region to measure the proton beam polarization.
[PDF] RHIC pC CNI Polarimeter: Status and
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p-c polarimeters at rhic|Proton