[Bonuslist] BONuSFEST! Please respond…

Fri Aug 1 11:53:26 EDT 2014

Dear all,

our "BONuSFest" is now 1 week ago, and before I "disappear" (travel for the next 2 weeks), I wanted to try and summarize what we discussed regarding the necessary recoil detector R&D work. Please correct me or add anything I might have forgotten. BTW, all the talks are linked to the Agenda for July 25 on the BONuS wiki at
	https://clasweb.jlab.org/rungroups/bonus/wiki/index.php/Fri_July_25

Basically, I think we agreed that we need to study more in depth two possible options for the BONuS12 recoil detector so we can make an informed decision which version to pursue, and to begin to address some of the issues which we will have to solve for either version. As a background, please refer to the officially submitted BONuS12 proposal at
	http://www.jlab.org/exp_prog/proposals/06/PR12-06-113.pdf
for information on the required rate capabilities, background suppression, momentum and z-vertex resolution etc.

As you know, the two options under discussion are either to follow the original RTPC/GEM design with various improvements, as laid out in the proposal (see above). Alternatively, we discussed the recoil detector design by the Argonne/CEA group (see this link: 
	https://userweb.jlab.org/~baltzell/LERD/LERD_v0.pdf ) 
I believe the best way to have a realistic assessment of both options, we need to follow something like the "red team/blue team" approach, where two groups of people works on either one of those design options to answer the salient questions:

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.)?
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?
7) Your suggestion here!

If I understood correctly, the following people might be interested to work on the Argonne design (fast avalanche wire chamber(s) followed by Si detectors):
Nathan (simulation, design), Kawtar, Raphaël, Stepan, Eric (who has agreed to check out the existing Hall A detector of similar design and look into the possibility of testing it at HUPTI), and others (please let me know. Gail, would you be interested?)
I hope the following people are willing to look into the RTPC/GEM design:
Jixie (in particular GEANT simulation and DREAM DAQ), Nilanga, Slava, Dipangkar, Thia and others - again, let me know if you want to be added to (or subtracted from) this list.
Others who expressed interest in helping with either version ones we get into building hardware, doing tests etc. include Gabriel, Ioanna, Keith, Stephen and myself (please let me know if you want to be added to that list).
(Please don't be offended if I either forgot to include your name above or mis-allocated you! This is clearly not written in stone…)
Another issue we need to think about is how we can obtain funding for any R&D efforts for these detector concepts, as well as the final detectors themselves. Apart from the usual ideas (NSF MRI), we could also look into a new DOE program named IDRD - see 
	http://www.jlab.org/Hall-B/secure/bonus/kuhn/NewDOEfunding.pdf and 
	http://www.jlab.org/Hall-B/secure/bonus/kuhn/NewDOEfunding2.pdf
as well as possibly joint funding (within the DOE SBIR program) with industrial partners (Nevzat, who is now employed by Spectrum Scientific, Inc., is looking into possibilities). 

I haven't completely figured out yet how we go about organizing these two efforts - if anyone would like to volunteer (themselves or someone else) to lead either group, please let me know. Maybe we can have reports from both groups in the coming BONuS meetings - the next one will occur on August 20.

Sorry for the lengthy email - I am awaiting your responses and hope to "see" you on the 20th. - Sebastian

On Jul 23, 2014, at 4:13 PM, Sebastian Kuhn <kuhn at jlab.org> wrote:

> Dear Bonusites and (hopefully) interested parties,
> 
> our 2014 "BONuS Workfest" will take place as scheduled THIS FRIDAY, July 25, starting at 11:00 a.m., in room L102 CEBAF Center. You can find the up-to-date agenda (as always) by going to the wiki at
> https://clasweb.jlab.org/rungroups/bonus/wiki/
> and clicking on "Meeting Agendas and Minutes" and then the date. It is also reproduced below - please note that some talks have been slightly reshuffled. Let me know immediately if there is a conflict that we need to solve. 
> 
> As you can see, so far nobody has volunteered to give a presentation during the first 1 1/2 hours - please let me know if you are willing to do that. Otherwise, we will review the various options we talked about at the last meeting and, most importantly, form a group that will explore these options more in depth. Please come prepared to give us your ideas and to tell us whether
> a) you are interested to join the recoil detector R&D effort
> b) what kind of experience/expertise you have
> c) whether you have access to lab space, relevant parts and electronics, and
> d) manpower (students, postdocs, technicians, other senior personnel)
> Hopefully we can come up with a realistic plan that will lead us to a decision which direction to pursue within the next 6-12 months.
> 
> For the afternoon session, I ask all speakers to post their presentation somewhere on the web and link it to the agenda (or tell me where it is) ahead of time (Friday morning at the latest) so things will go smoothly and to make the talks available to people who cannot attend on Friday.
> 
> You can attend the meeting from off-site using BlueJeans - the instructions are also repeated below. 
> Looking forward to seeing you on Friday - Sebastian
> 
> Schedule
> 
>  11:00	Options for a new low-momentum recoil detector - General Discussion (volunteers for presentations are strongly encouraged to contact me)
>  12:30	Lunch
>   1:30 	Status of combined fit of world data on p and n - Narbe/Eric
>   2:00	Status of Analysis and Paper on Duality - Ioana
>   2:30	Status of EMC paper - Keith
>   3:00	BONuS data and global PDF fits - Wally
>   3:15  BONuS data and FSI - Sebastian
>   3:30	Status of pi- analysis and data - Jixie
>   4:00	Additional discussion, Closeout
> [edit]Dial-in instructions
> 
> We will use the Bluejeans videoconferencing software. The ESNet "READYTALK" system we have been using so far will be phased out and will no longer be supported after August 1st. Here are the instructions:
> 1) For full multi-media access, enter in your web browser the following URL: https://bluejeans.com/7576835804. You will be asked whether you want to login or just join as a participant. Choose "participant" and follow the on-screen instructions (you may be asked to download a browser extension when you use Bluejeans for the first time). You should see images from other participants and hear sound on your computer's loudspeakers. If you have a video camera (built-in or hooked up to your computer), others will be able to see you. You must have a microphone (built in or hooked up to your computer) to communicate. Ideally, you should use headphones (with integrated mike if possible) to reduce feedback; alternatively, you can mute yourself when you are not talking. There is even an iPhone and Android app if you want to participate by tablet/smartphone… ;-)
> 2) If this sounds all too complex, it should still be possible to dial in.
> The new phone nr. is 1-888-240-2560
> The new meeting ID is 7576835804 (my ODU office phone nr). You enter this after the prompt, followed by the "#" sign, and after the 2nd prompt, press "#" again. That's it - you should be able to talk and hear us as usual; however, you won't see video and shared desktop.
> 
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