1 / 3

RHIC average AN

Discrepancy between the AGS CNI polarimeter and RHIC CNI polarimeters. RHIC average AN. Ratio of RHIC AN to AGS AN: 1.255387 Stable spin direction in the AGS with dual SNK at 45.5: C15: ny=0.979 H10: ny=0.958 end of AtR: blue ny=0.976

pello
Download Presentation

RHIC average AN

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Discrepancy between the AGS CNI polarimeter and RHIC CNI polarimeters RHIC average AN • Ratio of RHIC AN to AGS AN: • 1.255387 • Stable spin direction in the • AGS with dual SNK at 45.5: • C15: ny=0.979 • H10: ny=0.958 • end of AtR: blue ny=0.976 • yellow ny=0.986 • ratio: blue/ags=0.997 • yellow/ags=1.01 • Stable spin direction in the • AGS with WSNK at 46.5 • C15: ny=-0.996 • H10: ny=-0.996 • end of AtR: blue ny=0.966 • yellow ny=0.995 • ratio: blue/ags=0.970, yellow/ags=0.999 • Stable spin direction is from Junpei and Nick • RHIC stable spin direction is vertical on the 1st order

  2. How is AN gets calculated in the AGS and in RHIC • AGS: • Use the weighted 24GeV Analyzing power vs. Carbon’s energy. This is an extrapolation from the AGS E950 data where analyzing power was measured with 21.7GeV protons • The weighting factor 1.11 is based on Haixin’s comparison of RUN05 beam polarization at RHIC injection vs. beam polarization at the AGS extraction • Note • In Run05. ratio between Blue polarization at injection and AGS is 1.072 and the ratio between Yellow polarization at injection and AGS is 1.085 according to Haixin. Since the AGS RUN 05 configuration is a 5.9% warm snake plus rf dipole, the ratio of the stable spin direction at the end of AtR vs. the stable spin direction at AGS polarimeter is about 0.96 in Blue and 0.98 in Yellow. Hence, the AGS polarization is about 10% lower than the RHIC polarization. • In RUN05, the average ratio of Blue polarization at store vs. Blue polarization at injection is 1.0. Since the 100 GeV analyzing power is calibrated by Jet polarimeter, this suggests the AGS measured polarization is under-estimated as Thomas suggested. • In current run, the AGS is using a 15% cold snake plus a 5.9% warm snake. The stable spin direction in this configuration is further away from vertical in the AGS. However, it gets partially compensated by AtR. • RHIC: • Use the analyzing power vs. carbon energy measured by the AGS E950 at 21.7 GeV

  3. Larry Trumen fit of E950 data at 21.7GeV * A_N values from L. Trueman fit to E950 data (21.7 GeV) *      t = e * 22.18 / 1000000. * INJECTION         real*4 anth(25)         data anth/      +    0.0324757, 0.0401093, 0.0377283, 0.0339981, 0.0304917,      +    0.0274323, 0.0247887, 0.0224906, 0.020473,  0.0186837,      +    0.0170816, 0.0156351, 0.0143192, 0.0131145, 0.0120052,      +    0.0109786, 0.0100245, 0.00913435, 0.00830108, 0.00751878,      +    0.00678244, 0.00608782, 0.00543127, 0.00480969, 0.00422038 • Larry Trumen extrapolation of E950 data to 24GeV for p_beam = 24 GeV/c      data anth24/ & 0.0325162, 0.0402138, 0.0377803, 0.0339914, 0.0304368,     &         0.0273388, 0.0246635, 0.0223387, 0.0202982, 0.0184885,     &         0.0168682, 0.015405, 0.0140739, 0.0128548, 0.0117321,     &         0.0106928, 0.00972665, 0.00882495, 0.0079806, 0.00718762,       &         0.00644095, 0.00573632, 0.00507005, 0.004439, 0.00384045

More Related