[Moller] [EXTERNAL] Re: Detector meetings restart

[Michael Gericke]

Good morning everyone,

The doodle poll indicates that the best meeting time is 4:00 pm to 5:00 
pm (EST) on Tuesdays. There is also
3:00 pm to 4:00 pm on Tuesdays, with one if-need-be (Jim). So as not to 
make this meeting too late for people on
the east coast I would be inclined to say we meet at the earlier time, 
unless there are significant objections.

Either way, I suggest we alternate with the simulation meeting (same 
week day), as we have done in the
past. So I'll wait to see when that sequence starts to pick a start date 
for this meeting.

Cheers,

Michael



On 1/5/2021 12:06 PM, Michael Gericke wrote:
> Dear Colleagues and Collaborators:
>
> I would like to restart and schedule regular integrating detector 
> meetings and want to start with a doodle pool
> that just identifies a day and time. Then we can decide how often we 
> need to have this meeting and when to
> start.
>
> Here is the link:
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__doodle.com_poll_2qvp8hnkce7kbdbm-3Futm-5Fsource-3Dpoll-26utm-5Fmedium-3Dlink&d=DwICaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=k2-3YiXM4PG72x9M5ma_2Q&m=9m3YBUNR9Pg6ixaY04gBG7odCiWlWtXAu5OlMxDfK3k&s=WwjPpeKqR-360Krs1cQdD14Mg4w7XT_hrA2QtL6OB4I&e= 
>
>
> It has been a long time (my fault) since we have had dedicated 
> detector meetings, but a lot has happened
> in the intervening months.
>
> To a large extent, most of the progress related to the detectors has 
> been on the simulation side, but mostly
> in context of how the detectors fit within in the larger experiment 
> (rates, backgrounds, shielding, mounting),
> rather than how they function as modules (efficiency and stability).
>
> The larger scale simulation results about detector rates, backgrounds, 
> and shielding needs, now need to be folded
> in with the detector module design, which has been progressing 
> (somewhat) on a parallel but partially disconnected
> track. What may seem ideal in one setting may not work when viewed in 
> another.
>
> We have also had several meetings regarding the detector electronics 
> and hardware development toward the back-end
> of the detectors (PMTs and bases). There has been a lot of movement 
> toward finalizing the design for the bases, preamp
> and the ADC board and it would be good to fold that in which the rest 
> of the detector design as well (e.g. what is our
> actual rate in the detectors and how well do the light guides de-focus 
> the produced photons on the PMT cathode, etc.)
>
> Finally, the design of the light guide geometry and the associated 
> design of the module mounting structure has been
> done in some detail only for the Ring5 detectors, but even that design 
> is far from complete. I think we need to push hard
> on finalizing what we really need these light guides to look like and 
> then make a final design of he corresponding mounting
> structure. This aspect will require significant additional optical 
> simulations that are somewhat separate from those usually discussed
> in the biweekly simulation meetings and should therefore be discussed 
> in a dedicated detector meeting (as we used to).
> There exists a detector module mounting design, but whether that 
> design is realistic mostly depends on the shape of the
> light guides. We are starting to use 3D printing to make prototypes of 
> the mounting structure, to see how things fit together.
>
> This is not an exhaustive list of things we need to look at, but is a 
> summary of the major things we need to resolve. A longer
> list also includes more specific, but labor intensive, aspects of the 
> detector design, such as linearity tests and radiation damage
> issues.
>
> If you are not on the detector meeting email list, but would like to 
> get involved, please consider subscribing to the list.
>
> Best regards,
>
> Michael
>
>
>
>