[Moller_intdet] [EXTERNAL] Detector meetings restart

[Michael Gericke]

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=sAcmfDnmgp80OHNp8BT9B0ppMns-xHhof47DzJMhOgs&m=mxTVplpOxO2o8v39t8ohsMSzzi7vhWgIXXzaZSZXBr8&s=ymMWyj4me6jloTrPJqxV7XDIbjruX7jf_Y4spaoVTXE&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