sPHENIX HCal discussion

[Stefan Bathe <bathe AT bnl.gov>]

We also permanently glued sleeves over the existing 60 fiber bundles that serve as stoppers to maintain the 12 mm gap between the end of the fiber bundle and the beginning of the diffuser.

There were two issues with the plugs:  (i) they didn’t have a stopper; and (ii) it was hard to install the diffuser.  For the first six sectors the diffusers have been installed and the sleeves have been glued to act as a stoppers.  So both issues have been addressed.  Therefore I see no reason to not use the existing plugs for the preproduction sectors.

If we could use the modified plugs for the production sectors, that would save us some work.  So that would be good.

Regards,

Stefan 

-- 

---------------------------------------------------------------------------------
Stefan Bathe

Professor of Physics
Baruch College, CUNY

Baruch:                                     BNL:
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phone 646-660-6272                phone 631-344-8490
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On Aug 6, 2019, at 8:50 AM, Eric Mannel <mannel AT bnl.gov> wrote:

Steve-

I don't think the added cost should be a factor if it makes for a more uniform and simpler assembly process. Once we hear back from Uniplast if they are going to provide new modified plugs we can adjust the quote for and order the difusers for the balance of the HCal.

Eric

On 8/6/19 7:44 AM, Boose, Stephen wrote:

Edward,

 

I guess the only issue with discarding the existing plugs for Modules1-6 is that the diffusers are glued in, so that’s about $600 lost in diffusers. Aside from that this new design will obviously fix a couple of issues with assembly and save some effort.

 

Steve Boose

sPHENIX Experiment

Brookhaven National Laboratory

BLDG 510C

Upton, NY 11973

Phone: (631) 344-2897

 

 

From: sPHENIX-HCal-l <sphenix-hcal-l-bounces AT lists.bnl.gov> On Behalf Of kistenev AT bnl.gov
Sent: Monday, August 05, 2019 4:39 PM
To: Ruggiero, Richard <ruggiero AT bnl.gov>
Cc: sphenix-hcal-l AT lists.bnl.gov
Subject: Re: [Sphenix-hcal-l] Proposed Changes to Fiber Plug

 

Richie, 

I suggest to ask Xiaochun to contact Uniplast to get plug modifications immediately approved. I will not be surprised to learn that all plugs are already produced and ready for shipment (UNIPLAST is constrained by completion date  only).

And the question to Steve / Sal - plugs for the first 6 sectors - are you planning to replace those with new ones (no problems doing it - all what we need is to ask for early delivery and delay connecting bundles until that time). For reasons which are already obscured contract asks  for 1000 of those plugs, 400 saltshakers and 275 fiber bundles - plugs shell be plenty for the whole calorimeter.

 

                                  Edward

On Aug 5, 2019, at 3:59 PM, Ruggiero, Richard <ruggiero AT bnl.gov> wrote:

 

 

Hi All,

                I’ve made a few changes to the Fiber Plug detail (see attached drawings). I added a step for the fiber ferule to be inserted to the proper distance from the diffuser. I also decreased the diameter of the diffuser counter bore to give Sal an easier time gluing them in place. Comments? Suggestions?

 

Rich

<205-0150-0040-Fiber Plug.pdf><205-0150-0037-Fiber Bundle Assembly.pdf>_______________________________________________
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-- 
Eric J. Mannel, Ph.D.
sPHENIX Group
Physics Dept.
Brookhaven National Laboratory
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