P-Carbon CNI polarimeter test for RHIC polarized proton beam
Abstract
The collision of polarized proton beams at RHIC will provide qualitatively new and exciting physics. It requires excellent polarimetry. In the early years the most important use of the polarimeter is to tune the accelerator. The requirement for tuning the machine is fast measurement and analysis. There are a couple of methods to measure the beam polarization. We consider the idea of using elastic scattering in the Coulomb-Nuclear Interference region which uses low-t, 12C(p,p)12C. If it works at RHIC environment, a major advantage will be the cost compared to other methods. Another advantage is small dependence of the beam energy on the asymmetry. The polarimeter consists of an ultra thin carbon target in the beam line and two arms of silicon detector and micro channel plate which identify the recoiled carbon by measuring the time of flight and its energy. The polarimeter was placed in the vacuum chamber in the AGS ring. The analyzing power of the CNI interaction with polarized proton beam at 21.4GeV was measured in March 99. This presentation will show the experimental setup, the result of the analyzing power measurement, and our plan for the polarimeter construction of the RHIC polarized proton beam.
- Publication:
-
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- October 1999
- Bibcode:
- 1999APS..DNP..JG07A