Positions of the temperature sensors in EXES

EXES has 6 thermal diodes, labeled A, C2, C4, D2, D3, D4. Their placement has been the same for CD013, CD014, CD015 and CD016. 

A: detector thermal stage

C2: X-plate (on the metal bracket that stabilizes the G10 X between the He and LN2 shield plates.

C4: base plate of the vapor shield

D2: on the outside of the echelon side wall, ~2" above the O-box circular base plate.

D3: base plate of the LN2 shield

D4: base plate of the He shield

Some temperatures during the cooldown period of CD16.

10/23 (LN2 cooling begun at 9:40AM)
11:00AM
A:  281.6K
C2 149.8K
C4 82.6K
D2 79.2K
D3 281.6K
D4 281.6K

10/24 (LN2 cooling of He and LN2 dewars, stopped He dewar fills when A<100 K)
2:30 PM
A: 92.5 K
C2 186.4 K
C4 231.2 K
D2 92.8 K
D3 77.6 K
D4 93.2 K

10/25 LN2 (cooling of He and LN2 dewars, resumed He dewar partial fills with LN2)
4:24PM
A: 83.89 K
C2: 153.4 K
C4: 225.4 K
D2: 80.0 K
D3: 77.8 K
D4: 77.5 K

10/27 He cooling begun 6:30AM
11:04 AM
A: 22.15 K
C2: 107.27 K
C4: 204.98 K
D2: 15.07 K
D3: 77.34 K
D4: 4.30 K

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Continued on 11/13/2013

In order to find the LHe hold time, we filled cryogens and monitored the boil-off by trying to take note of when positive pressure through the He Bunsen tube ceases. Unfortunately, it appears this isn't a great way to do it, because the LHe dewar and detector were clearly lifting off while air was still blowing through the Bunsen tube. Perhaps the continuing boil-off after He is gone is due of other gases in the neck tube, like O2?

We will continue by noting when D4 sensor lifts off a certain value.


Filled at 2:35PM on 11/12/13

at +20:00 hrs
A: 6.1068 (E-box on but detector unheated)
C2: 57.060
C4: 204.36
D2: 4.9116
D3: 77.724
D4: 4.2841

at +26:54 hrs
A: 6.9987 detector heated to 7.000 with 12mW heating.
C2: 57.059
C4 205.753
D2: 5.1200
D3: 77.745
D4: 4.3501

at +27:25 hrs
A: 7.0012
C2: 57.060
C4: 205.831
D2:5.2942
D3:77.750
D4:4.8290

at +28:10 hrs
D4: 5.57

at +28:36 hrs
A:7.2595
D4: 6.1136