sPHENIX EMCal discussion

["Rinn, Timothy Thomas" <trinn AT illinois.edu>]

Hello Huan,

 

We were very happy to be able to do those tests, so thank you for sending us the blocks.

 

With regard to the scintillation test I believe it is an important test to do as it is realistically the only test which shows that the block will function. Although we have not had issues with blocks passing this test at UIUC it is important to verify that the blocks are fully functional prior to permanent installation in a sector. Although with these first couple of block shipments we are planning on repeating the QA testing here at UIUC in order to compare QA procedures, this will not be the case as production ramps up. Therefore if it is not tested at Fudan we will not find out about scintillation issues before the block is fully assembled into a sector. Here at UIUC the test itself does not take a large amount of time, on the order of 5-10 minutes per block.

 

I have seen the photos of the mold design as of last Friday and it looks like it will have very good reproducibility and can see why it takes additional assembly time. I strongly recommend using the wedges to evaluate dimensionality as they test exactly what the sawtooth design is sensitive to, they also significantly reduced the time it takes to measure a block and improved the reproducibility of the measurements. Additionally it would have the added benefit of utilizing the exact same evaluation method between UIUC and Fudan. We have machine programs/drawings for the wedges of block designs 19-24 which we should be able to share so you can manufacture a set.

 

I hope you have a great Chinese New Year,

Tim

 

 

From: Huan Zhong Huang <huang AT physics.ucla.edu>
Sent: Tuesday, January 14, 2020 4:23 PM
To: Rinn, Timothy Thomas <trinn AT illinois.edu>; sphenix-emcal-l AT lists.bnl.gov
Subject: RE: [Sphenix-emcal-l] Block Shipment from Fudan received at UIUC

 

Hi Tim,

  Many thanks for the comparisons you have made. During the Fudan group meeting last night, we discussed the need to finalizing the QA procedure at Fudan and prepare for a production readiness review in March. One question we had is with the scintillation test. Do we need the scintillation test set up at Fudan? What quality of the block do you expect to check with the scintillation test? Was there any block with quality issue, which passed the other QA procedure and was identified with the scintillation test? We are trying to minimize the QA steps while maintaining the essential ones.

  Our modification of the mold structure led to slightly more time needed for assembly. We hope the change will improve the reproducibility of blocks in the production. The measurement method for dimensions would be important. Do you recommend us to use the wedges too?

  The Chinese New Year break starts next week. Next two weeks will be very slow.

  Thanks again. Regards,

  Huan

 

From: sPHENIX-EMCal-l <sphenix-emcal-l-bounces AT lists.bnl.gov> On Behalf Of Rinn, Timothy Thomas
Sent: Tuesday, January 14, 2020 11:54 AM
To: Rinn, Timothy Thomas <trinn AT illinois.edu>; sphenix-emcal-l AT lists.bnl.gov
Subject: Re: [Sphenix-emcal-l] Block Shipment from Fudan received at UIUC

 

Hello Everyone,

 

We have had the opportunity to now fully test the two blocks shipped to us from Fudan. The results, and comparisons to what was measured at Fudan, are detailed in the attached slides. However, the short form of the comparison is that we observe over all good agreement with the results of Fudan’s QA tests. With the largest deviations arising in the dimensions, where we are using two distinctly different methods for evaluation (wedges at UIUC and calipers/height gauge at Fudan).

 

We are very happy to have received the shipment of these first two nice blocks, and are actively looking forward to receiving the next larger shipment of blocks here at UIUC!

 

Best Regards,

Tim

 

From: sPHENIX-EMCal-l [mailto:sphenix-emcal-l-bounces AT lists.bnl.gov] On Behalf Of Rinn, Timothy Thomas
Sent: Friday, January 10, 2020 3:07 PM
To: sphenix-emcal-l AT lists.bnl.gov
Subject: [Sphenix-emcal-l] Block Shipment from Fudan received at UIUC

 

Hello Everyone,

 

Today we excitedly received the first shipment of 2 blocks from Fudan at the NPL at UIUC! They were packed very thoroughly which provided us with a lot of fun unpacking the many layers of boxes, foam, and tape (see attached photo) and ensured that no damage happened during transport. We have already started testing these blocks and will run these blocks through the full testing procedure here at UIUC. We expect to report the results of which at the emcal meeting next week.

 

Best Regards,

Anne and Tim