DOE EPSCoR Proposal

Abstract

We propose to develop a partnership between Jefferson Lab's (JLab) Continuous Electron Beam Accelerator Facility (CEBAF) in Newport News, VA and the Idaho Accelerator Center (IAC) at Idaho State University. The partnership will initially be nurtured through a research and development project designed to construct a positron source for the CEBAF. The first year of this proposal will be used to benchmark the predictions of our current simulation with positron production efficiency measurements at the IAC. The second year will use the benchmarked simulation to design a beamline configuration which optimizes positron production efficiency while minimizing radioactive waste. The second year will also be devoted to the design and construction of a positron converter capable of sustaining the heat load from high luminosity positron production. The final year will be used to quantify the performance of the positron source and measure the source's radiation footprint. A joint research and development project to construct a positron source for use by the CEBAF will bring together the experiences of both electron accelerator facilities and solidify this partnership for future projects. Our intention is use the project as a spring board towards developing a program of accelerator based research and education which will train students to meet the needs of both facilities as well as provide a pool of trained scientists for others.

Year 1

1. Install positron beam line.
2. Check positron productions efficiency simulations for 10-20 MeV electrons on Tungsten Target (expecing 17 nA of positrons for a 10mA electron beam at E=?)
3. Investigate differences between simulation and data, most likely need another week of beam to change configuration

Year 2

1. Measure production efficiency for different Tungsten converter target thicknesses (100 microns -> 1mm in 100 micron steps)
2. Measure positron emmitance and compare to simulation predictions
3. Measure brightness as a function of quad setting (quads change emmitance)
4. measure positron output as a function of beam current
5. Begin designing tungsten converter capable of handling high heat load
6. CEBAF can accept particles into acceleration stage as long as [math]\frac{\Delta E}{E} \leq 10^{-3}[/math]
7. Electrons are injected at 500 MeV (1 GeV) for a 6 GeV (12 GeV) CEBAF. Currently [math]\frac{\Delta E}{E} \leq 10^{-5}[/math]

Year 3

1. Conceptual Positron source design level 1 (CD1)
2. IAC beam is x 40 less power than what will be needed at JLAB

Parts list

1. Media:FaradayCup.pdfFC $5k 400 W max power
2. Media:ConverterMotor.pdf

Latex File

The LaTex file for this proposal is under Media:Positrons.txt