sPHENIX discussion of the superconducting solenoid

["Yip, Kin" <kinyip AT bnl.gov>]

Hi,

 

Thanks, Dave !  Dave told me that he fixed the wiring and now you may see the black line (MT01) suddenly changed to something much lower :

 

https://www.c-ad.bnl.gov/kinyip/download/Magnet_Temp.gif  (I wrote a script to plot a few temperatures from LogView every

30 minutes and post it in my website) .   Dave said that this sensor “MT01” will be more accurate when it gets to lower temperature (like Helium 😊 ).

 

MT01 (from our experience from 2018) is about the only “real” coil temperature (left from BaBar).

 

Kin

 

From: Nace II, David <dnace AT bnl.gov>
Sent: Tuesday, October 4, 2022 9:33 AM
To: Yip, Kin <kinyip AT bnl.gov>; Masi Jr, Leonard <masi AT bnl.gov>; Than, Yatming (Roberto) <ythan AT bnl.gov>; Danielson, Nils S <ndanielson AT bnl.gov>
Subject: RE: Emailing: MT01.jpg

 

Kin,

 

I got MT01 measuring. I don’t think that it is as accurate at temperatures close to room temperature than other sensors we use. It is currently reading lower then I would expect, but that is where the current resistance of the sensor makes it land on the curve. According to sensor specifications it operates more accurately at lower temperatures. When we actually get cold we will see how well the sensors operate.

 

Dave

 

From: Yip, Kin <kinyip AT bnl.gov>
Sent: Tuesday, October 4, 2022 8:15 AM
To: Nace II, David <dnace AT bnl.gov>; Masi Jr, Leonard <masi AT bnl.gov>; Than, Yatming (Roberto) <ythan AT bnl.gov>
Subject: RE: Emailing: MT01.jpg

 

Hi, Dave,

 

I have written a script to update a plot of mt01, ct01 and ct02 :

https://www.c-ad.bnl.gov/kinyip/download/Magnet_Temp.gif

(which is ~ kind of automated.)

 

ct01 and ct02 are dropping.  mt01 still stays the same.  The temperature curve of mt01 doesn't respond until low temperature or what ?

 

Kin

 

 

 

-------- Original message --------

From: "Nace II, David" <dnace AT bnl.gov>

Date: 10/3/22 8:58 AM (GMT-05:00)

To: "Yip, Kin" <kinyip AT bnl.gov>, "Masi Jr, Leonard" <masi AT bnl.gov>, "Than, Yatming (Roberto)" <ythan AT bnl.gov>

Subject: RE: Emailing: MT01.jpg

 

I cannot "tune" this sensor. It is not a CLTS sensor. It is going to a Lakeshore and has a temperature curve associated with it. This sensor is a Carbon Glass Resistor and has a temperature curve like a Cernox sensor. When we start to get cold, this sensor will most likely start to work. If it doesn't I will check the sensor wiring to make sure that it is measuring correctly.

Dave

-----Original Message-----
From: Yip, Kin <kinyip AT bnl.gov>
Sent: Saturday, October 1, 2022 9:32 AM
To: Nace II, David <dnace AT bnl.gov>; Masi Jr, Leonard <masi AT bnl.gov>; Than, Yatming (Roberto) <ythan AT bnl.gov>
Subject: Emailing: MT01.jpg

Hello Dave (and all),

The other days you told me in 1008B that you were tuning the Cryo thermal sensors ( ... not my strain gauges).  

I attach a page of your HMI.  The MT01 that I've circled) is probably the most relevant sensor for the Magnet temperature that is left over for us (from BaBar in SLAC).  
It seems to show 330 K compared to others which show <~ 300 K.

Can you please try to "tune" this thermal sensors to make it more appropriate ?

Kin