sPHENIX discussion of the superconducting solenoid

[John Haggerty <haggerty AT bnl.gov>]

Got it... cool!  Now I can check that the earth still has a magnetic field!

On 12/8/17 3:46 PM, Kin Yip wrote:
> Hello John Haggerty,
>
> You may find the 4 Gaussmeter measurement on the GPM under the tree:
>
> /Development/sPHENIX/magField.mon
>
> ( Winston had a typo in his email: "com" -> "mon"   and  you may need to 
> choose "All Monitor Files" in GPM to see it.  )
>
> Winston told me that it's still running in his machine acnlin75 as he's 
> got a little problem moving into the server.  So, he's working on that.
> After it's all working, we'll start logging it in the "LogView" (ie. 
> starting to log).
>
> I attach a plot of the GPM fields (around 1 G).
>
> Kin
>
> -------- Forwarded Message --------
> Subject: 	RE: [Sphenix-magnet-l] one bad RTD ... but I found a 
> replacement from Len Masi
> Date:   Fri, 8 Dec 2017 17:31:28 -0500
> From:   Pekrul, Winston <wpekrul AT bnl.gov>
> To:     Yip, Kin <kinyip AT bnl.gov>
>
>
>
> Kin,
>
> Gaussmeter GPM is running at /Development/sPHENIX/magField.com.
>
> Winston
> ------------------------------------------------------------------------
> *From:* sPHENIX-magnet-l [sphenix-magnet-l-bounces AT lists.bnl.gov] on 
> behalf of Kin Yip [kinyip AT bnl.gov]
> *Sent:* Friday, December 08, 2017 5:27 PM
> *To:* sphenix-magnet-l AT lists.bnl.gov
> *Cc:* Masi Jr, Leonard; Toldo, Frank A; Biggs, John C
> *Subject:* [Sphenix-magnet-l] one bad RTD ... but I found a replacement 
> from Len Masi
>
> Hi,
>
> This afternoon, Frank Toldo tried to read the temperature sensors 
> attached to the surface of the cryostat surface (which are supposed to 
> monitor the seasonal temperature changes).   He's puzzled why it said 
> "OPN" (opened) for a while.    Long story short, after Paul Giannotti 
> and I came to help set things and investigate, we finally realized that 
> one RTD is good which give us ~75 F ~ close to 110 ohm or so ... whereas 
> the other was reading 7k ohm --- explaining why the meter said 
> "opened".   That bad RTD was inside the inner radius of the cryostat and 
> Frank was able to measure the resistance and confirmed that the RTD was 
> broken (huge resistance).
>
> So, Frank called Omega to order 2 (and each cost $139) but it'll be 
> shipped on Monday and arrived at BNL on Tuesday, kind of late for our 
> schedule.  So, I asked a few colleagues including Tony Curcio and Len 
> Masi Jr.    Len has just given me an Omega RTD : SA1-RTD-4W-SB, and 
> another cheap one.
>
> I've learnt a little about these RTD's in the last couple of hours.   
> Though the one that we have is STRD-1 
> (https://www.omega.com/pptst/SRTD-1_SRTD-2.html) and is slightly 
> different the one that Len gave me --- SA1-RTD 
> (https://www.omega.com/pptst/SA1-RTD.html), they're both 100 ohm 
> platinum and both use the so-called European curve (temp coefficient = 
> 0.00385Ω/Ω/°C). They're just packaged differently.
> One is polymide insulated whereas the other is silicon-based.   Roberto 
> Than and Len have both believe that they're interchangeable.   After 
> reading all the specifications, I'm convinced too that they're the 
> "same" to us, especially that we just try to measure the temperature to 
> see whether they'd be different for 10 F or something.   I've discussed 
> with Jim Mills who also agrees.
>
>
> So, on Monday, I'll try to ask Frank to install the one that Len gave 
> us.  We may just need short 2 of the 4 wires to become 3 wires
> (as Len advised) or we can actually use 4 wire.
>
>
>   ***********
>
>
> Roberto told me that their plant seems to be working normally at the 
> moment ... Sometime tomorrow, it'll start to produce liquid He ... A day 
> later, we will have a curve and Roberto et. al. can then tell us whether 
> the Plant is working near 100% capacity or not.
>
>
> Kin
>
>
>
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--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358