Harold G. Kirk

Inclusive soft pion production from 12.3-Gev/c and 17.5-GeV/c protons on Be, Cu and Au

Differential cross-sections are presented for the inclusive production of charged pions in the momentum range 0.1 to 1.2 GeV/c in interactions of 12.3 and 17.5 GeV/c protons with Be, Cu, and Au targets. The measurements were made by Experiment 910 at the Alternating Gradient Synchrotron in Brookhaven National Laboratory. The cross-sections are presented as a function of pion total momentum and production polar angle

Scheme for Ionization Cooling for a Muon Collider

\theta

A Muon Cooling Ring with Curved Lithium Lenses

with respect to the beam.

Observation of 10 μm Smith-Purcell radiation from 45 MeV/c electrons

We discuss a complete scheme for production and cooling a muo n beam for three specified Muon Colliders. We outline the parameters for these Muon Collide rs. The scheme starts with the front end of a proposed Neutrino Factory that yields bunch tr ains of both muon signs. Emittance exchange cooling in upward or downward broad helical lattic es reduces the longitudinal emittance until it becomes possible to merge the trains into single bun ches: one of each sign. Further cooling in all dimensions is applied to the single bunches in further upward climbing helical lattices. Final transverse cooling to the required parameters is achi eved in 50 T solenoids that use high temperature superconductor. Preliminary simulations of e ach element are presented. We discuss known challenges.

SEARCH FOR A J(pc) EXOTIC HYBRID MESON

We design a muon cooling ring with curved Lithium lenses for the 6 dimensional muon phase space cooling. The cooling ring can be the final muon phase space cooling ring for a Higgs Factory, a low energy muon collider. Tracking simulation shows promising muon cooling with simplified magneti element models.

Search for narrow

Using the high-brightness, high-energy electron beam at the Brookhaven Accelerator Test Facility we observe forward directed Smith-Purcell radiation in the mid-infrared spectral regime. This radiation can prove useful as a source of infrared radiation for other scientific studies as well as a providing a precursor investigation of the inverse process, namely the acceleration of electrons by means of the coupling of laser light with electrons via micro-structures.

\bar{p}p

This paper describes an experiment that will search for JPC hybrid mesons at the Brookhaven MPS‐II facility. Such explicitly exotic states are allowed in QCD, and are predicted to be in an accessible mass region by several models. The experiment will investigate the production of exotics in the reaction π−p→π−f1p. Expected rates and experimental sensitivity to possible hybrid states are discussed.

states in the reaction

We have carried out a sensitive (> or approx. =5 events/nb) search for narrow p-barp states at the BNL Multiparticle Spectrometer. We found no evidence of narrow p-barp states at 2020 and 2200 MeV in the reaction ..pi../sup -/p..-->..p..pi../sup -/p-barp at 16 GeV/c. We quote 2 upper limits of or approx. =5 s signals at 2020 and 2200 MeV.