sPHENIX discussion of the superconducting solenoid

[Kin Yip <kinyip AT bnl.gov>]

Hi,

> lead end platform by going up and over the lead end steel instead of by walking across the superconducting magnet.

As of right now, there is nothing for you to go/climb up the Lead-End steel.   We need a ladder.  We do have a ladder and scissor lift ...
To go to the lead-end from the inside, you have to either go through the center of the solenoid or go along the two very narrow sideways (between the Cryostat
and the steel box).  Placing my body sideway, I can penetrate this side path but kind of barely.    So, people have been walking over the solenoid all the time.   
Maybe, we should try to persuade people from doing so and put up the ladder on the lead-end side.

Kin

On 07/10/2017 04:33 PM, Anerella, Michael D wrote:

John, Kin, All,
We haven't ever analyzed the allowable load, since there shouldn't ever be any.  I don't see why personnel and large tools don't make their way to the lead end platform by going up and over the lead end steel instead of by walking across the superconducting magnet.  Even if there is no structural damage, there could be some deleterious effect on the old bolted O-ring vacuum seals.  Unlikely, but why take unnecessary risks?
p.s.   No surprise regarding John's reply below, given his infamous photo standing inside the magnet, celebrating its transfer to BNL...
cheers,
Mike



-----Original Message-----
From: sPHENIX-magnet-l [mailto:sphenix-magnet-l-bounces AT lists.bnl.gov] On Behalf Of John Haggerty
Sent: Monday, July 10, 2017 3:19 PM
To: sphenix-magnet-l AT lists.bnl.gov
Subject: Re: [Sphenix-magnet-l] Is it OK to stand inside the solenoid ?

Kin,

I don't know for sure; I think the drawings say the inner wall is 10 mm
5083 aluminum, but at SLAC they lifted the solenoid with a spider that fit inside the cryostat like this:

http://www-project.slac.stanford.edu/slacpix/BaBar/16_mag/to_290.jpg

so I always assumed that it wasn't a problem if a couple of people threw their weight around.

sPHENIX itself does not intend to put any load on the cryostat inner wall as far as I know.

On 7/10/17 1:28 PM, Yip, Kin wrote:

Dear Mike, Paul, Jon & Dave,

As Paul Orfin asked below, I sometimes wonder about this too when I 
saw people walk through the solenoid.

Can we safely walk and stand inside the inner solenoid ?  
Approximately how much weight can the inner solenoid handle ?

/Sent from my Verizon LG Smartphone/

------ Original message------
*From: *Orfin, Paul
*Date: *Mon, Jul 10, 2017 12:37
*To: *Yip, Kin;
*Cc: *
*Subject:*RE: Sonny and Joe have taken the half-rack ... waiting for 
the survey result ... carpenter putting up the railing

Kin,

Has anyone determined the maximum load allowed  on the inner diameter 
of the solenoid?  I don't know the details of the inner plate 
thickness but there may be a weight limit for materials being brought 
in by foot.  I just want to make sure there is no damage to the 
solenoid.  I understand that the magnet was built to handle large 
magnetic forces but concentrated loads from someone's foot for 
instance, may not have been taken into design consideration.  Looking 
at the pictures of people in the magnet made me think of this just now.

Thank you,

Paul Orfin
Cryogenic Systems, Collider-Accelerator Department Brookhaven National 
Laboratory
Telephone: (631) 344-2899

*From:*sPHENIX-magnet-l 
[mailto:sphenix-magnet-l-bounces AT lists.bnl.gov]
*On Behalf Of *Yip, Kin
*Sent:* Monday, July 10, 2017 11:50 AM
*To:* sphenix-magnet-l AT lists.bnl.gov
*Subject:* [Sphenix-magnet-l] Sonny and Joe have taken the half-rack ... 
waiting for the survey result ... carpenter putting up the railing

Hi,

45 minutes ago or so, I showed Sonny Simaiuta and Joe Dambra where the 
half-rack was in Bldg. 912.  They have taken it to Superconducting 
Magnet

Division to make small modification.

I've just taken another picture this morning around the Magnet/steel box :

https://collab.external.bnl.gov/sites/sPHENIX-Magnet/Pictures/High%20F
ield%20Test/Return%20Yoke%20Construction/2017-7-10.jpg

Apparently, the survey was taken late last Friday after the magnet was 
slightly rotated.  Now, we're waiting for the survey group to analyze

the data.  Matt (who has been doing the analysis)  is out today and 
Frank Karl is trying to see whether he can do the analysis   or   they 
have to wait

for Matt to come back tomorrow.

Richard Meier was moving his cables.   I also saw that a carpenter was 
installing the railing for the platform (all in Aluminium) in the Lead-End.

So, the schedule  that D. Phillips sent last Friday (below) seems to 
be materializing (though Dave is not here today).  Hopefully, the 
riggers and Ray Ceruti's group can install the Extension this Wed.

Kin

*From:* Phillips, David B
*Sent:* Friday, July 07, 2017 11:45 AM
*To:* Ceruti, Raymond B <rayc AT bnl.gov <mailto:rayc AT bnl.gov>>; Yip, Kin 
<kinyip AT bnl.gov <mailto:kinyip AT bnl.gov>>; Mills, James A 
<mills AT bnl.gov <mailto:mills AT bnl.gov>>; Hock, Jonathan <jhock AT bnl.gov 
<mailto:jhock AT bnl.gov>>; Streckenbach, Brian <bstreckenbach AT bnl.gov 
<mailto:bstreckenbach AT bnl.gov>>
*Cc:* Kobasiuk, Frederick D <kobasiuk AT bnl.gov 
<mailto:kobasiuk AT bnl.gov>>; Folz, Charles <cfolz AT bnl.gov 
<mailto:cfolz AT bnl.gov>>; Anerella, Michael D <mda AT bnl.gov 
<mailto:mda AT bnl.gov>>; Karl, Francis X <karl AT bnl.gov 
<mailto:karl AT bnl.gov>>; Ilardo, Matthew <milardo AT bnl.gov 
<mailto:milardo AT bnl.gov>>
*Subject:* sPHENIX Magnet plan for next week

sPHENIX Magnet plan for next week:

Friday 7/7 - Riggers place cryostat in correct position

Friday 7/7-Monday 7/10 - Survey confirms cryostat is correctly 
positioned

Monday 7/10-Tuesday 7/11 - Carpenters install handrails and access 
ladder to internal Lead End platform.

Wednesday 7/12 - Riggers and Magnet Division install Valve Box 
Extension

Monday 7/10 - until completed - Drilling/taping holes in return steel

Thursday 7/13 - until completed  - Riggers install return steel (this 
needs to be coordinated with MD Teck's working on Dog House 
connections)

Week of 7/17:

-MD Teck's continue with Dog House connections

-Riggers install Return Steel and shield blocks for Valve Box Platform

-Carpenters assemble scaffolding for access to External Dog House

-Carpenters install handrails etc for Valve Box Platform

David Phillips

Building 911B

Upton, NY 11973

631-344-4671, Fax 631-344-5954, Cell 631-804-9477

On site pager 344-3456 then 4267 then your number



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--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358
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