IPAC2011 - List of Authors (Yaver, H.)

Paper	Title	Page
TUPC168	Results from the LHC BRAN Luminosity Monitor at Increased Luminosities	1428
	R. Miyamoto BNL, Upton, Long Island, New York, USA E. Bravin CERN, Geneva, Switzerland H.S. Matis, A. Ratti, W.C. Turner, H. Yaver, T. stezelberger LBNL, Berkeley, California, USA
	Funding: This work supported by the US Department of Energy through the US LHC Accelerator Research Program (LARP). The LHC BRAN luminosity monitors are used to monitor and optimize the luminosity at the LHC high luminosity interaction points IP1 and IP5. The Argon gas ionization chambers detect showers produced in the TAN absorbers by neutral particles emerging from pp collisions. The detectors have been operated during the 2010 run by counting the shower rate. As the current 2011 run has the multiplicity of proton-proton collisions per bunch crossing near ten, the detector sees more than one collision per bunch crossing. Therefore, the operation of the detector has been switched to pulse height mode to detect the average shower flux. This paper presents results from recent pulse height mode measurements, including the total and bunch-by-bunch luminosity as well as a determination of the crossing angle at these IPs. Comparisons with luminosity measurements from ATLAS and CMS are also presented.

Paper

Title

Page

Results from the LHC BRAN Luminosity Monitor at Increased Luminosities

1428

R. Miyamoto
BNL, Upton, Long Island, New York, USA
E. Bravin
CERN, Geneva, Switzerland
H.S. Matis, A. Ratti, W.C. Turner, H. Yaver, T. stezelberger
LBNL, Berkeley, California, USA

Funding: This work supported by the US Department of Energy through the US LHC Accelerator Research Program (LARP).
The LHC BRAN luminosity monitors are used to monitor and optimize the luminosity at the LHC high luminosity interaction points IP1 and IP5. The Argon gas ionization chambers detect showers produced in the TAN absorbers by neutral particles emerging from pp collisions. The detectors have been operated during the 2010 run by counting the shower rate. As the current 2011 run has the multiplicity of proton-proton collisions per bunch crossing near ten, the detector sees more than one collision per bunch crossing. Therefore, the operation of the detector has been switched to pulse height mode to detect the average shower flux. This paper presents results from recent pulse height mode measurements, including the total and bunch-by-bunch luminosity as well as a determination of the crossing angle at these IPs. Comparisons with luminosity measurements from ATLAS and CMS are also presented.