RPC Temperature Studies A Cimmino Temperature Studies 310

Temperature Studies • 310 temperature sensors are collocated throughout the barrel. • Temperatures are

Average Temperature for 3 Wheels during Cruzet 3 Wheel 0 appears to be the

Temperature Distribution for 3 Wheels at the beginning and end of Cruzet 3 While

Average Temperature Plot and Distribution for Reference sensors during Cruzet 3 Compatible with a

Possible heating sources • RPC FEB LVs • DT FEB & Mini. Crate LVs

What happens if RPC LVs are turned off? DT minicrates ON ~1°C every 10

What happens if DT LVs are off? Data from Cruzet 4 DT LV off

DTemp with DT OFF & RPC ON Temperature increase distribution after 5 days with

Temperature with DT&RPC ON W-2 Sector 4 RB 1 in & RB 1 out

°C Temperature of water during Cruzet 4 Sensor stopped reading ~2. 5 hours

Cooling Schema Flow-limiters 1. 5 liter/minute 1. 5 x 50/2 = 37 l/min/wheel

Cooling RB 4 IN RB 4 RB 3 RB 2 RB 1 OUT RB

DTemp between RB 4 and RB 1 in Odd Sectors Even Sectors

Temperature Distribution by Stations RB 2 RB 1 in RB 3 RB 1 out

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RPC Temperature Studies A. Cimmino

Temperature Studies • 310 temperature sensors are collocated throughout the barrel. • Temperatures are monitored by the RPC DCS system online • Values are written in OMDS with a 0. 3°C dead band (sensor resolution). • Temperatures measured during Cruzet 3 & 4 were analyzed and are here presented. • The behavior of each single sensor has been studied.

Average Temperature for 3 Wheels during Cruzet 3 Wheel 0 appears to be the hottest one at all times 62 sensors/Wheel In 6 days the average temperature of the wheels increases of ~ 1 -1. 5°C as you may see from the next slide

Temperature Distribution for 3 Wheels at the beginning and end of Cruzet 3 While the average temperature is below the critical value (23°C) our concern are due to these tails Black = 07/07/2008 2 pm Red = 13/07/2008 2 pm

Average Temperature Plot and Distribution for Reference sensors during Cruzet 3 Compatible with a horizontal line

Possible heating sources • RPC FEB LVs • DT FEB & Mini. Crate LVs • ECAL Cables(? ? ? )

What happens if RPC LVs are turned off? DT minicrates ON ~1°C every 10 days of increase Slopes measured in °C/day (8. 5 ± 1. 1) * 10 -2 (11. 5 ± 1. 3) * 10 -2 (9. 0 ± 1. 2) * 10 -2 (9. 9 ± 1. 3) * 10 -2 (9. 3 ± 1. 1) * 10 -2 LVs OFF from 09/07/2008 7 pm

What happens if DT LVs are off? Data from Cruzet 4 DT LV off the entire period on Sectors 6 & 7 Wheel-2 RPC FEBs ON

DTemp with DT OFF & RPC ON Temperature increase distribution after 5 days with DT LVs OFF °C

Temperature with DT&RPC ON W-2 Sector 4 RB 1 in & RB 1 out ~ 2. 5 °C of increase during Cruzet 4 week ----- Weekend = RPC ON & DT OFF DT ON – Cruzet 4 ~1. 5°C of increase in the first day

°C Temperature of water during Cruzet 4 Sensor stopped reading ~2. 5 hours

Cooling Schema Flow-limiters 1. 5 liter/minute 1. 5 x 50/2 = 37 l/min/wheel

Cooling RB 4 IN RB 4 RB 3 RB 2 RB 1 OUT RB RB 2 1 • Cooling water is shared by 2 adjacent sector • Sectors are twined as shown in the tables Wheels +1, 0, -1, -2 IN OUT Wheel +2 IN OUT 12 11 2 3 10 9 4 5 8 7 6 5 8 9 4 3 10 11 2 1

DTemp between RB 4 and RB 1 in Odd Sectors Even Sectors

Temperature Distribution by Stations RB 2 RB 1 in RB 3 RB 1 out RB 4 Temperatures refer to the 11/07/2008 2 pm