Present status of CMS HF quartz fiber calorimetry

The experiments at the Large Hadron Collider will have to deal with unprecedented radiation levels. The design of the CMS forward calorimetry detector (HF) is now finalized. The present design of CMS calls for the HF calorimeter to be based on quartz fiber technology. It consists of two modules, located symmetrically at about 11 meters from either side of interaction point. They cover the pseudorapidity range 3-5. The length along the beam is 1.65 m or 10 nuclear interaction lengths. Each calorimeter consists of a large steel block that serves as the absorber. Embedded quartz fibers in the steel absorber run parallel to the beam and constitute the active component of the detector. In order to optimize energy resolution for E and E /sup T/ flows and forward jets, the calorimeter is effectively segmented longitudinally by using two different fiber lengths. The present status will be discussed. (6 refs)

Beam Test Results of a Longitudinally Segmented Quartz Fiber Calorimeter with High Energy Electrons and Pions

We present the results of test beam studies of a longitudinally segmented quartz fiber calorimeter prototype constructed in the process of developing the CMS forward calorimeter. This particular prototype consists of fully independent electromagnetic and hadronic sections. We discuss equalization of reconstructed energies for electrons and pions and describe in detail the measured performance

LHC Heavy Ions: A CMS Perspective

The LHC will collide protons at sqrt{s} = 14 TeV and lead ions at sqrt _NN = 5.5 TeV. These energies are much higher than with the Fermilab Tevatron or RHIC. Huge experiments are being assembled at four interaction points along the 27 km LHC ring. Although it is a lar ge step into the unknown, there have been extensive calculations predicting data rates for a wide variety of processes to be observed by these experiments. Here we consider primarily the results of lead collisions as will be observed by the CMS experiment