From williams.2560@gmail.com Fri Nov 21 15:20:21 2008 Date: Fri, 21 Nov 2008 15:20:20 -0600 From: Christopher Williams To: Henry J. Frisch Subject: Re: P335 Abstract Dear Henry, I am working with Paolo Privitera in Astronomy, on the next step in the Airfly fluorescence yield measurement. I don't really have a good title yet. The goal of the project is to make an absolute measure of UV fluorescence from high energy particle showers. To do this we will be performing a beam test at Fermi Lab along with the PMT calibration in situ. We will be using Rayleigh scattered photons from a 337 nm laser to calibrate the PMT. Because the process of Rayleigh scattering is well understood, this measurement will be used to cancel the quantum efficiencies from the fluorescence measurement. This should then give an absolute measure of the UV fluorescence relative to shower energy. For the project I will be setting up and performing the calibration measurements, both in the lab and at Fermi Lab. For P335: (1) Design the laser test set up based on Rayleigh Scattering Calculations (2) Construct set up in lab (3) Take PMT measurements in lab using the laser set up (4) Join laser set up with full testing set up (5) Make precise calibration measurements in full set up --Chris -- Christopher Williams williams.2560@gmail.com