[Pwg] e+LOI announcement

[ERIC VOUTIER]

 Dear Colleagues,

 Good news!  The proceedings of JPos17 have been submitted to AIP Publishing and will soon be 
 available for perpetual free on-line access for anyone.  In addition, a limited number of paper 
 copies will be printed and mailed to contributing presenters.

 What’s next? As forecast, we would now like to begin the path of developing a White Paper on 
 Positron Physics at Jefferson Lab. It is a lengthy process, so we realistically intend to provide 
 this to lab management in early 2019.

 To kick-start this effort, we are organizing to submit a collaborative Letter-of-Intent to PAC 46 
 (July 16-20, 2018) for a positron experimental program at CEBAF 12 GeV. We propose to gather in one 
 document several individual topics, each with persons of contact and dedicated to a specific experiment. 
 So far, we identify several classes of experiments: deeply virtual Compton scattering, two-photon exchange 
 related physics, beyond the Standard Model physics, and polarized target experiments. The individual 
 contributions may be proposed for experimental Halls A, B and C, utilizing existing detection capabilities 
 or new dedicated detectors when necessary. These proposals should consider using <100 nA polarized positron 
 beam currents and <10 µA unpolarized positron beam currents, as well as usual polarized electron beam currents. 
 We wish to gather all contributions by May 18, 2018 in order to prepare for the June 4 submission deadline to 
 PAC46.We will organize a group video-conference in mid-April to discuss the process.

 In the meantime, please let us know if you would be interested in developing a LOI within this context and 
 what kind of experiment it would concern. We wish to assemble as strong a group as possible and coordinate/share 
 the effort among interested persons to make this combined LOI as compelling as possible.

 Kind regards,

 Eric & Joe

 PS: if not already done, please subscribe to the Positron Working Mailing list pwg at jlab.org which will be used 
 for communication about these efforts.