sPHENIX HCal discussion

["Kistenev, Edouard" <kistenev AT bnl.gov>]

My guess would be - this is one of the pilots. 

All fibers are polished by tech who is well over 80 and 30 years ago polished 15k fiber bundles in PbSc of PHENIX. UNIPLAST and work keep him alive. He believes he is the best for his job .... and normally his work matches his believes. But he has his bad days. To be on the safe side everything is checked one more time by girls while packaging - viewing bunched fiber ends (connectors) all at once.  Dead fibers are trivial to identify, badly polished may go through. This one found is one fiber out of 25x160.

At this rate we may expect 3 more (one in OHCal, 2 in IHCal). Please pay attention and give Vladimir Stepanovich a break.

Just comment - LED system as designed says nothing about tile quality - if tile quality is questioned - we need tile tester at BNL (most of parts are there, need JH & EoB to agree and release Mike Lenz from what he is doing now for a week). 

Edward 

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From: Boose, Stephen <boose AT bnl.gov>
Sent: Wednesday, February 3, 2021 12:02 PM
To: Bathe, Stefan <bathe AT bnl.gov>
Cc: Kistenev, Edouard <kistenev AT bnl.gov>; sphenix-hcal-l AT lists.bnl.gov <sphenix-hcal-l AT lists.bnl.gov>
Subject: RE: [Sphenix-hcal-l] 16/32 oHCal sectors assembled

 

Hi Stefan,

 

Ok, that’s a relief.

 

Thanks,

 

Steve Boose

sPHENIX Experiment

Brookhaven National Laboratory

BLDG 510C

Upton, NY 11973

Phone: (631) 344-2897

 

From: Stefan Bathe <bathe AT bnl.gov>
Sent: Wednesday, February 03, 2021 11:49 AM
To: Boose, Stephen <boose AT bnl.gov>
Cc: Kistenev, Edouard <kistenev AT bnl.gov>; sphenix-hcal-l AT lists.bnl.gov
Subject: Re: [Sphenix-hcal-l] 16/32 oHCal sectors assembled

 

Hi Steve,

 

This is just a one-off bundle where, I guess, Uniplast forgot to cut off the fibers at the ferrule end and polish them.—One in more than 160 we have used so far, which were all fine.—We could have cut an polished ourselves, but we thought Sal could probably do a better job than us.  I think that’s how that bundle made it to Sal.

So in summary, no reason for concern.

 

Regards,

Stefan

On Feb 3, 2021, at 10:07 AM, Boose, Stephen <boose AT bnl.gov> wrote:

 

Edward,

 

Boy do I hate to take on the job of spoiler but here goes …

 

Sal was asked to look over some of the fibers and while they look fine on the source end, the fibers at the tile end stick out of the connectors and are rough cut at a 45 degree angle. It looks like the cut and polish procedure was skipped. If that’s true it would certainly explain any observed disparities in tile illumination.

 

I hope this is a misunderstanding on my part.

 

Steve Boose

sPHENIX Experiment

Brookhaven National Laboratory

BLDG 510C

Upton, NY 11973

Office: 631 344-2897

 

From: sPHENIX-HCal-l <sphenix-hcal-l-bounces AT lists.bnl.gov> On Behalf Of Kistenev, Edouard
Sent: Wednesday, February 3, 2021 9:37 AM
To: Bathe, Stefan <bathe AT bnl.gov>; sphenix-hcal-l AT lists.bnl.gov
Subject: Re: [Sphenix-hcal-l] 16/32 oHCal sectors assembled

 

Stephan, I am usually a spoiler and always able to find something forgotten like muon data with two sectors on top of each other. But this time - what the correct word - kudos!

 

Edward

 

And we are ready to build the cradle - right.

 

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From: sPHENIX-HCal-l <sphenix-hcal-l-bounces AT lists.bnl.gov> on behalf of Stefan Bathe <bathe AT bnl.gov>
Sent: Tuesday, February 2, 2021 10:28 PM
To: sphenix-hcal-l AT lists.bnl.gov <sphenix-hcal-l AT lists.bnl.gov>
Subject: [Sphenix-hcal-l] 16/32 oHCal sectors assembled

 

Dear HCal friends,

I’d like to share the good news that as of tonight, 16 out fo 32 oHCal sectors have been assembled, tested, and have cosmics calibration data taken.  In other words:  halfway done!
This has truly been a collaborative effort with many, many people contributing, from numerous institutions.  It’s been a real pleasure seeing the detector come together like this.
Way to go, oHCal, and way to go, sPHENIX!

Regards,
Stefan

-- 
---------------------------------------------------------------------------------
Stefan Bathe
Professor of Physics
Baruch College, CUNY

Baruch:                                     BNL:
17 Lexington Ave                      Bldg. 510
office 940                                  office 2-229
phone 646-660-6272                phone 631-344-8490
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