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RPC Temperature Studies

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).

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RPC Temperature Studies

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  1. RPC Temperature Studies A. Cimmino

  2. 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 Cruzet3 & 4 were analyzed and are here presented. • The behavior of each single sensor has been studied.

  3. Average Temperature for 3 Wheels during Cruzet3 Wheel0 appears to be the hottest one at all times In 6 days the average temperature of the wheels increases of ~1 -1.5°C as you may see from the next slide 62 sensors/Wheel

  4. Temperature Distribution for 3 Wheels at the beginning and end of Cruzet3 While the average temperature is below the critical value (23°C) our concern are due to these tails Black = 07/07/2008 2pm Red = 13/07/2008 2pm

  5. Average Temperature Plot and Distribution for Reference sensors during Cruzet3 Compatible with a horizontal line

  6. Possible heating sources • RPC FEB LVs • DT FEB & MiniCrate LVs • ECAL Cables(???)

  7. What happens if RPC LVs are turned off? 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 DT minicrates ON ~1°C every 10 days of increase LVs OFF from 09/07/2008 7pm

  8. What happens if DT LVs are off? Data from Cruzet4 DT LV off the entire period on Sectors 6 & 7 Wheel-2 RPC FEBs ON

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

  10. Temperature with DT&RPC ON W-2 Sector 4 RB1in & RB1out ~ 2.5 °C of increase during Cruzet 4 week --------- ~1.5°C of increase in the first day Weekend = RPC ON & DT OFF DT ON – Cruzet4

  11. Temperature of water during Cruzet 4 °C Sensor stopped reading ~2.5 hours

  12. Cooling Schema Flow-limiters 1.5 liter/minute 1.5 x 50/2 = 37 l/min/wheel

  13. Cooling IN • Cooling water is shared by 2 adjacent sector • Sectors are twined as shown in the tables RB4 OUT RB4 RB3 RB3 RB2 Wheels +1,0,-1,-2 RB2 Wheel +2 RB1 RB1

  14. DTemp between RB4 and RB1in Odd Sectors Even Sectors

  15. Temperature Distribution by Stations RB2 RB1in RB3 RB1out RB4 Temperatures refer to the 11/07/2008 2pm

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