Yagmur Torun

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

Recent RF results from the MuCool Test Area

\theta

Pressurized rf cavities in ionizing beams

with respect to the beam.

High-energy high-luminosity µ+ µ- collider design

The MuCool Experiment has been continuing to take data with 805 and 201 MHz cavities in the MuCool Test Area. The system uses RF power sources from the Fermilab Linac. Although the experimental program is primarily aimed at the Muon Ionization Cooling Experiment (MICE), we have been studying the dependence of RF limits on frequency, cavity material, high magnetic fields, gas pressure, coatings, etc. with the general aim of understanding the basic mechanisms involved. The 201 MHz cavity, essentially a prototype for the MICE, was made using cleaning techniques similar to those employed for superconducting cavities and operates at its design field with very little conditioning.

Vacuum RF Breakdown of Accelerating Cavities in Multi-Tesla Magnetic Fields

A muon collider or Higgs factory requires significant reduction of the six dimensional emittance of the beam prior to acceleration. One method to accomplish this involves building a cooling channel using high pressure gas filled radio frequency cavities. The performance of such a cavity when subjected to an intense particle beam must be investigated before this technology can be validated. To this end, a high pressure gas filled radio frequency (rf) test cell was built and placed in a 400 MeV beam line from the Fermilab linac to study the plasma evolution and its effect on the cavity. Hydrogen, deuterium, helium and nitrogen gases were studied. Additionally, sulfur hexafluoride and dry air were used as dopants to aid in the removal of plasma electrons. Measurements were made using a variety of beam intensities, gas pressures, dopant concentrations, and cavity rf electric fields, both with and without a 3 T external solenoidal magnetic field. Energy dissipation per electron-ion pair, electron-ion recombination rates, ion-ion recombination rates, and electron attachment times to

Targets and Magnetic Elements for Pion Collection in Muon Collider Drivers

SF_6

High-energy high-luminosity /spl mu//sup +//spl mu//sup -/ collider design

and

RF Studies at Fermilab MuCool Test Area

O_2

Proposal to upgrade the MIPP experiment

were measured.

The MuCool Test Area and RF Program

We discuss the design of a high luminosity (10/sup 35/ cm/sup -2/ s/sup -1/), high energy (2+2 TeV) /spl mu/+/spl mu//sup -/ collider, starting from the proton accelerator needed to generate the muon beams and proceeding through the muon storage ring.We discuss the design of a high luminosity (1035 cm-2 s-1), high energy (2 + 2 TeV) µ+µ- collider, starting from the proton accelerator needed to generate the muon beams and proceeding through the muon storage ring.