[Bonuslist] BONuS12 issues and meetings

[Sebastian Kuhn]

Dear (potential) BONuS12 collaborators,

after today's meeting I would like to send out the following information:

1) Meeting times: To find the meeting time that works best for all in the next 1/2 year, please fill out the Google Poll at:
http://doodle.com/4dswyhyzau9kps6p

2) We have formed two teams, the "blue" and the "red" team, to evaluate and flesh out the two recoil detector designs we are presently considering.

BLUE TEAM:
Avalanche wire chamber + Si design by the Argonne/CEA group (see this link: 	https://userweb.jlab.org/~baltzell/LERD/LERD_v0.pdf as well as other links on today's agenda - https://clasweb.jlab.org/rungroups/bonus/wiki/index.php/August_20 ) 
Coordinator: Gail Dodge
Members: Nathan Baltzell (design, simulation), Raphaël Duprés, Kawtar Hafidi, Eric Christie, Keith Griffioen, Stepan Stepanyan

RED TEAM:
Improved RTPC
Coordinator: TBA (Stephen Bültmann?)
Members: Jixie Zhang (GEANT, DREAM DAQ,…), Nilanga Liyanage, Slava Tkachenko, Dipangkar Dutta, Thia Keppel, Narbe Kalantarians

Additionally, the following people are interested to work on hardware/prototyping/testing:
Gabriel Niculescu, Ioana Niculescu, Sebastian

Please let me know if you want to join any one of these groups. Hopefully we will have reports from both groups at future meetings (next one in 2 weeks). Some of the issues to address:

1) What is the highest luminosity we can realistically achieve (including trigger and DAQ rates), and how big of a problem will random hits and multiple tracks create (latency, ambiguities, degradation of tracking etc.)? Tradeoff between target length, target thickness, diameter, beam current, wall-induced background etc.
2) How sensitive are we to backgrounds (noise, "hot channels", Moeller electrons, photons, pions, and other particles) and how can we minimize them?
3) What kind of resolution in momentum can we achieve (as a function of momentum and angle)?
4) What is a realistic momentum range over which we can reliably detect, identify and measure the momentum of protons?
5) Particle ID: how reliably can we measure dE/dx (e.g., for the GEM design, how can we improve gain homogeneity and stability)? How well can we separate protons from pions, deuterons etc. and how well can we separate 3He from 3H and 4He?
6) What is the maximum total acceptance in theta, phi and p we can achieve?

Greetings - Sebastian
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