Video for Main PCB and the $120 SiPM?

[mbanders]

There appears to be a missing link to a video:

The top side of the Main PCB is used strictly for the SiPM. We’ve made a video describing this part, that you can view here.

from this page http://cosmicwatch.lns.mit.edu/detector#steps

The reason we ask is because the SiPM bag itself lists warnings such as:

After bag is opened, devices that will be subjected to solder or other high temperature process must be Mounted within 72 hours of factory conditions <30 C and 60% RH.

Devices reqwuire bake before mounting if Humidity Indicator Card reads >10% for level 2a-5a devices or 60% for level 2 devices when read at 23 C...

So we just want to make sure we are handling these devices correctly and in the way you recommend to construct the desktop muon detector. We're especially cautious since the SiPM is the most expensive part at about $120.

[spenceraxani]

Hi,

Thanks for noting the broken link. We need to remake the video and will hopefully have it together within the next few weeks. We will also post a video describing how to build the main PCB.

The main recommendation that I can give with regards to handling the SiPM would be to use a clean desk and avoid using tweezers when mounting them. The surface is easily scratched. The warning on the bag suggest that the SiPMs should be left in the humidity controlled bag until they are ready to use. We try and follow this but we have also re-used SiPMs multiple times, and used SiPMs that have not been in the humidity controlled bag. The SiPMs appear to be very robust. Out of the ~100 SiPMs that have been used in the muon detectors, we have only broken a few: one from putting too much force on the SiPM Pins and another from dipping it in liquid Argon. Perhaps SensL can comment more about the warning.

We also clean any finger prints or dirt off of the acrylic face after soldering it in place. This is not really necessary unless it became soiled with mounting it to the PCB.

Hope this helps.

Thanks,

Spencer

On Dec 4, 2017, at 12:45 PM, Mike Anderson notifications@github.com wrote:

There appears to be a missing link to a video:

The top side of the Main PCB is used strictly for the SiPM. We’ve made a video describing this part, that you can view here.

from this page http://cosmicwatch.lns.mit.edu/detector#steps http://cosmicwatch.lns.mit.edu/detector#steps The reason we ask is because the SiPM bag itself lists warnings such as:

After bag is opened, devices that will be subjected to solder or other high temperature process must be Mounted within 72 hours of factory conditions <30 C and 60% RH.

Devices reqwuire bake before mounting if Humidity Indicator Card reads >10% for level 2a-5a devices or 60% for level 2 devices when read at 23 C...

So we just want to make sure we are handling these devices correctly and in the way you recommend to construct the desktop muon detector.

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/spenceraxani/CosmicWatch-Desktop-Muon-Detector/issues/2, or mute the thread https://github.com/notifications/unsubscribe-auth/ABpeuy7a2-9D0dQT4Xbjm9iOOaX4gFxpks5s9D3egaJpZM4Q1H6V.

[mbanders]

Thanks for tips! Video is nice, but I understand that's a lot of work. In the meantime do you happen to have a few photos of a detector partly built? Or even just another angle or two of a finished one? Just a few photos would help quite a bit in trying to understand how some of the pieces fit together.

(The reason I'm eager is that I'll soon have all the parts...)

[spenceraxani]

Hi,

You bet, I’ll try and post a handful of pictures tomorrow.

Thanks,

Spencer

On Dec 7, 2017, at 5:43 PM, Mike Anderson notifications@github.com wrote:

Thanks for tips! Video is nice, but I understand that's a lot of work. In the meantime do you happen to have a few photos of a detector partly built? Or even just another angle or two of a finished one? Just a few photos would help quite a bit in trying to understand how some of the pieces fit together.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/spenceraxani/CosmicWatch-Desktop-Muon-Detector/issues/2#issuecomment-350129288, or mute the thread https://github.com/notifications/unsubscribe-auth/ABpeu8qYKA0CSXkzxn3pFXvRD2SGnjfXks5s-Hg5gaJpZM4Q1H6V.

[spenceraxani]

Hi,

I've posted a bunch of photos in the 'Pictures' directory. We'll be including a link to a video where we build one detector from scratch on our website in the next few days.

Thanks,

Spencer

[mbanders]

Great photos! Thanks! Looks like you use standoffs with the scintillator - is that to keep the SiPM at just the right place touching it, and not putting too much pressure on it?

[spenceraxani]

The standoffs are actually to connect the SiPM PCB to the Main PCB. There isn’t a spacer between the SiPM PCB and the scintillator, although you could but a washer there if you want. When I build the detector, I just leave a small space so that you do not crush the SiPM.

Thanks,

Spencer

On Dec 12, 2017, at 9:37 AM, Mike Anderson notifications@github.com wrote:

Great photos! Thanks! Looks like you use standoffs with the scintillator - is that to keep the SiPM at just the right place touching it, and not putting too much pressure on it?

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/spenceraxani/CosmicWatch-Desktop-Muon-Detector/issues/2#issuecomment-351088365, or mute the thread https://github.com/notifications/unsubscribe-auth/ABpeu6VAqM9C49VqhQcnFLH1StbontXIks5s_p22gaJpZM4Q1H6V.