sPHENIX HCal discussion

[Stefan Bathe <bathe AT bnl.gov>]

Hi John,

There is an alternative to replacing the B25 tiles:  tap ten additional holes per sector to accommodate the tile clips for the B25 tiles we have on hand.  Richie, Carter, Aron, and I just discussed this.  We’d make a jig to make the drilling and tapping easier, and then it would take about two days of tech labor to tap the 60 holes for the six preproduction sectors.

The obvious advantage of this option is that we wouldn’t have to rely on the replacement tiles to get here in time.

We should make a decision which way we want to go.

Regards,

Stefan

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Stefan Bathe

Professor of Physics
Baruch College, CUNY

Baruch:                                     BNL:
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On Jun 13, 2019, at 11:43 AM, Lajoie, John G [PHYSA] <lajoie AT iastate.edu> wrote:

Dear HCAL’ers: 

 

Xiaochun, Anthony, Edward toured Uniplast Wednesday and met with Victor Majatski to discuss the results from the pre-production and action items for the full HCAL tile production.  The notes from this meeting are attached for reference.

 

Something not listed in the notes is that for the pre-production tile B25 was manufactured to an older design, before the light guide was moved to accommodate the combs in the outer HCAL.  This happened because an operator was on vacation when the production switch was made to B25, and the wrong file was loaded into the CnC machine. Uniplast recognizes this mistake and will replace the B25 tiles – they have sufficient spare materials on hand to start immediately and expect to have the replacement tiles completed in two weeks. Ideally we will still get them in July for the sector assembly, and I have spoken with Anthony about fast-tracking testing.  We have reviewed the rest of the tile designs and they are OK; Megan plans a test fit of a complete set in an oHCAL gap soon to verify. 

 

Nobody wants things like to happen, but they do. If everything seemed perfect I would worry what we missed….

 

Regards,

John

John Lajoie

Professor of Physics

Iowa State University

 

(515) 294-6952

lajoie AT iastate.edu

 

<Summary of HCAL Scintillating Tile Production Readiness Meeting.pdf>_______________________________________________
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