1. Peyrej @ ipno.in2p3.fr Orsay - October 2007IPNO-RDD-Jean Peyré1 Measurements of air temperature Christine Le Galliard Jean Peyré Oct 2007

2. Peyrej @ ipno.in2p3.fr Orsay - October 2007IPNO-RDD-Jean Peyré2 Results of simulations: Max air temperature between CH1 & CH2 Model developped at IPN Orsay by F. Launay Max temp: 38°C with inflated air at 20°C For details see presentation of F. Launay ~38°C

3. Peyrej @ ipno.in2p3.fr Orsay - October 2007IPNO-RDD-Jean Peyré3 XXXXXXXXXXXX XXXXXXXXXXXX X: local measurements Position of Sensors for ST1

4. Peyrej @ ipno.in2p3.fr Orsay - October 2007IPNO-RDD-Jean Peyré4 Position of Sensors for ST2 XXXXXXXXXXXX XXXXXXXXXXXX X: local measurements

5. Peyrej @ ipno.in2p3.fr Orsay - October 2007IPNO-RDD-Jean Peyré5 Test Scenario  : test from 11:00->15:00 ST1 & ST2 outside in position ST1 & ST2 inside open Cooling airflow 3000 m 3 /h (95%)  : test from 15:30->17:30 ST1 & ST2 outside in position ST1 & ST2 inside open Cooling airflow 2700 m 3 /h (85%)  : test from 17:35->19:45 ST1 & ST2 outside in position ST1 & ST2 inside in position Cooling airflow 2700 m 3 /h (85%) October 16 th  : test from 8:00->9:00 ST1 & ST2 outside in position ST1 & ST2 inside in position Cooling airflow 2700 m3/h (85%)  : test from 9:00->9:45 ST1 & ST2 outside in position ST1 & ST2 inside in position NO Cooling  : test from 9:45->11:30 ST1 & ST2 outside in position ST1 & ST2 inside in position Cooling airflow 1500 m3/h  : test from 11:30->12:00 ST1 & ST2 outside in position ST1 & ST2 inside in position Cooling airflow 2700 m 3 /h (85%) October 17 th Temperature of inflated air: 17°C

6. Peyrej @ ipno.in2p3.fr Orsay - October 2007IPNO-RDD-Jean Peyré6 Measurements for ST1 Max air temperature at nominal airflow (2700 m 3 /h): <30°C Max air temperature at maintenance airflow (1500 m 3 /h): 36°C Max air temperature without cooling: ? Sensors 32, 39 & 47 give a good idea of the studied phenomena

7. Peyrej @ ipno.in2p3.fr Orsay - October 2007IPNO-RDD-Jean Peyré7 Measurements for ST2 Max air temperature at nominal airflow (2700 m 3 /h): <26°C Max air temperature at maintenance airflow (1500 m 3 /h): 28°C Max air temperature without cooling: ? Sensors 25, 31 & 43 give a good idea of the studied phenomena

8. Peyrej @ ipno.in2p3.fr Orsay - October 2007IPNO-RDD-Jean Peyré8 Conclusion 1.Max air temperature reached at nominal airflow (2700 m 3 /h) for ST1/ST2: <30°C. This is fully acceptable 2.Max air temperature reached at maintenance airflow (1500 m3/h) for ST1/ST2: <36°C. The quadrants can operate with this airflow for several hours without any thermal damage 3.Max air temperature reached without cooling for ST1/ST2: >45°C. We have stopped the test after 45 minutes. Previous tests in Orsay (year 2000) showed that temperature between CH1/CH2 could easily reach 70°C or more after few hours without cooling. COOLING IS ABSOLUTLY NECESSERY FOR PROPER WIRE CHAMBERS WORK. 4.Air temperatures measured around Crocus boxes are 18°C on bottom and 23°C on top of the FASS 5.Temperatures and air speed measured at local points are fully compatible with F. Launay simulation (under beam pipe >3m/s and over it >1m/s) 6.Simulation made in Orsay describes correctly ST1/ST2 thermal environment (difference found of only 5°C) [38°C-20°C for simulation and 30°C-17°C for measurements]