[PEPPo] Proposed requirements for the electron driver for the positron source

[Alicia Hofler]

Hello all,

We have been asked to define the high and low limits of the gun voltage for the electron driver for the positron source.

In order to evaluate what is a "good" (good for the positron target), we are proposing to use a beam with more relaxed requirements than used for CEBAF.  The beam parameters that we prioritize for CEBAF are normalized emittance, bunchlength, and energy spread (sigma Ek).  For the positron driver, we are proposing to increase the CEBAF bounds by a factor of three.

We are asking for your comments on this proposal and for your suggestions for increasing or decreasing any of these requirements.  We plan to use these bounds for our simulation studies.

Attached is a document listing the initial and design parameters for the positron driver at LERF reported at IPAC 2023.  The document also provides the proposed increased CEBAF parameters under the title "Consider" (in the middle of the page) as well as the FEL 2004 parameters with an analogous three-fold increase for reference (at the bottom of the page).

-Alicia and Reza
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Alicia S. Hofler             JSA/TJNAF
hofler*at*jlab.org    Newport News, VA
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