observation of the rpcs after uxc set point change from 19 to 17degc
DESCRIPTION
Observation of the RPCs after UXC Set point change from 19 to 17degC. What we can observe. Average Chamber temperatures just before and after 18 Oct 2010. Yoke temperature. Individual examples of chamber temps. Distribution in Z Longer term Conclusions. - PowerPoint PPT PresentationTRANSCRIPT
Ian Crotty 27Nov 2010
Observation of the RPCs after UXC Set point change from 19 to 17degCObservation of the RPCs after UXC Set point change from 19 to 17degC
What we can observe.Average Chamber temperatures just before
and after 18 Oct 2010.Yoke temperature.
Individual examples of chamber temps.Distribution in Z
Longer term
Conclusions.
Ian Crotty 27Nov 2010
Ambient temp change did change on the 18 Oct.
Ambient temp change did change on the 18 Oct.
SPC = Set Point Change 19 -17 degC
Ian Crotty 27Nov 2010
Average Chamber temps before SP change
Average Chamber temps before SP change
Ian Crotty 27Nov 2010
Average temps after SP ChangeAverage temps after SP Change
Set Point 19 -1718 Oct 2010
0.31degC
0.28degC
0.06degC
0.36degC
0.23degC
0.04degC
Ian Crotty 27Nov 2010
Observation of the RPCs after UXC Set point change from 19 to 17degCObservation of the RPCs after UXC Set point change from 19 to 17degC
The SPC caused the temperatures to slightly decrease, which is good.
In addition the changes were more pronounced with distance from IP.
The very small differences in the RE1s can be explained by the enclosed nature of their
installation behind the CSCs.The RE2 and 3s are greater due to the
greater exposure in that the CSCs are on the opposite wall (yoke).
The difference between the RE2 and 3 may be due to the distance from the IP and
associated heat sources.It should be pointed out that absolute values
differences are small.
The following slides give some individual cases
Ian Crotty 27Nov 2010
Logged Yoke temps are not representative of the real conditions.
Logged Yoke temps are not representative of the real conditions.
1 degC variation in less than a day
Unfortunately these logs of temperature do not allow us to improve our understanding of the actions taken and the impact on the RE system
Ian Crotty 27Nov 2010
Temperature change of RE1/207.This chamber is on the YE+1
Temperature change of RE1/207.This chamber is on the YE+1
18 Oct 2010 SPC
Ian Crotty 27Nov 2010
Temperature change of RE3/307.This chamber is on the YE+3
Temperature change of RE3/307.This chamber is on the YE+3
18 Oct 2010 SPC
Ian Crotty 27Nov 2010
Temperature change of RE-3/307.This chamber is on the YE-3
Temperature change of RE-3/307.This chamber is on the YE-3
18 Oct 2010 SPC
Ian Crotty 27Nov 2010
RPC Temp Distributions in June 2010 RPC Temp Distributions in June 2010
+Z -ZRB0
20.3
3C
19.9
0C
19.7
9C
20.2
5C
20.2
5C
18.6
7C
19.4
1C
20.8
3C
21.3
3C
20.3
2C
21.9
2C
0.5C
0.8C
0.6C
0.7C
0.8C
0.75
C
Gains since April 2010
Ian Crotty 27Nov 2010
RPC Temp Distributions on 30 Nov 2010 RPC Temp Distributions on 30 Nov 2010
+Z -ZRB0
20.5
5C
20.1
2C
20.0
5C
20.3
4C S
D=0
.28
20.5
7C
19.0
0C
19.7
1C S
D=1
.10
20.8
0C S
D=0
.4
21.5
8C S
D=0
.36
20.8
1C S
D=0
.61
22.0
8C S
D=0
.35
0.03
C
0.09
C
0.16
C
0.25
C
0.49
C
0.3C
Small increases since June 2010
Mean
StDev
Increases are mitigated by the work undertaken during the year
Ian Crotty 27Nov 2010
Increasing of UXC temp since AugIncreasing of UXC temp since Aug
Part of the reason for the increase on the long term
Ian Crotty 27Nov 2010
Temperature plot of UXC for 2010
The structure is similar to the following slide showing chamber temps but without the increase since June
June to SPC
Ian Crotty 27Nov 2010
RE average temperatures during 2010
Steady temp increases since June until SPC
Ian Crotty 27Nov 2010
RB average temperatures during 2010
Temperatures are far more stable
Ian Crotty 27Nov 2010
Observation of the RPCs after UXC Set point change from 19 to 17degCObservation of the RPCs after UXC Set point change from 19 to 17degCTemperatures RE and RB in Z 30 Nov 2010 All temperatures are in degrees Centigrade
RE+3 RE+2 RE+1 RB+2 RB+1 RB0 RB-1 RB-2 RE-1 RE-2 RE-3
Outer *3 WBM WBM WBM WBM WBM WBM1 20.8 20.4 19.0 20.2 21.4 22.17 20.7 20.6 18.9 20.4 21.6 21.5
13 21.1 20.0 19.5 20.4 22.3 22.319 19.9 20.5 20.7 20.4 21.7 22.025 20.4 20.0 19.0 20.2 21.1 21.631 20.6 20.2 19.2 20.4 21.2 21.7
20.6 20.3 19.4 20.3 21.6 21.9
Inner *21 20.8 20.5 21.0 21.5 21.7 22.17 21.1 20.6 20.3 21.9 21.7 22.8
13 21.1 20.6 21.3 21.6 21.0 22.319 21.3 20.2 21.7 21.4 21.6 22.025 20.6 19.8 20.8 20.8 21.4 22.031 20.3 20.5 21.8 20.5 21.9 22.0
20.9 20.4 21.2 21.3 21.6 22.2
Av *2 & *3 20.73 20.33 20.27 20.81 21.55 22.03Av from PVSS 20.80 20.34 19.71 19.00 20.57 20.55 20.12 20.05 20.81 21.58 22.08
Mean from Above WBM 20.95Mean from PVSS for RE 20.4
Mean from Above WBM Ian crottyMean from PVSS for RB 20.06 30-Nov-10
Ian Crotty 27Nov 2010
Web Based Monitoring sourceWeb Based Monitoring source
RPC Temperature Now 2010.11.30 19:20:58 UTC Heartbeat 2010.11.30 19:20:33 UTC
The green sections represent those chambers which have sensors. Clearly the RB are better instrumented than the RE.
Ian Crotty 27Nov 2010
ConclusionsConclusions
The Set Point Change (SPC) in the UXC reduced by 2 degrees.
The ambient temperature at the X3 level in UXC reduced by 0.6-0.8degC. The chamber temperature reduction reached 0.3-0.4 degrees at best in the RE3 regions.There is a persistent asymmetry in the temperatures of the RE3s.Increases since June have been greater in the RE1s.From June to November there has been a steady increase in RE temps that is not evident in RB.As well as remnant heat emanating from the central detector region of CMS as has been suggested perhaps we see well cooled chambers in the barrel region and an influence of the ambient air temperature on the RE2 and RE3s. This implies that any attempt to circulate cool enough ambient air between the yokes will help.We need a solution to keep the present RE stations as cool as the barrel and also the future RE4 that we have started building.