Heating of ALFA detectors

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Presentation transcript:

Heating of ALFA detectors 03-11-2011 Sune Jakobsen

Heating of ALFA detectors Temperature sensors installed Temperature vs time Temperature vs number of particles Suggested counter measures Planned activities Temperature sensors installed Detector 1 + 2 PMF23 Air in Air out PMF1 PMF19 5 temperature sensors inside the black box 2 temperature sensors on the titanium substrate for the main trigger The temperature sensors (PT100) are not calibrated and has an offset of 5-15 °C NIELS BOHR INSTITUTE UNIVERSITY OF COPENHAGEN 2/6 Heating of ALFA detectors Sune Jakobsen

Heating of ALFA detectors Temperature sensors installed Temperature vs time Temperature vs number of particles Suggested counter measures Planned activities Temperature vs time Temperature on each of the 8 ALFA detectors All temperature sensors of Position7 (a upper detector) All temperature sensors of Position8 (a lower detector) Beam energy NIELS BOHR INSTITUTE UNIVERSITY OF COPENHAGEN 3/6 Heating of ALFA detectors Sune Jakobsen

Heating of ALFA detectors Temperature sensors installed Temperature vs time Temperature vs number of particles Suggested counter measures Planned activities Temperature vs number of particles in LHC This year the temperature increase from beam presence has been up to 18 °C (expected to be a max temperature of ~ 40 °C) If LHC doubles the number of particles next year the extrapolation would give a temperature increase from beam presence has been up to 30-40 °C (expected to be a max of ~ 60 °C) NIELS BOHR INSTITUTE UNIVERSITY OF COPENHAGEN 4/6 Heating of ALFA detectors Sune Jakobsen

Heating of ALFA detectors Temperature sensors installed Temperature vs time Temperature vs number of particles Suggested counter measures Planned activities Suggested counter measures Box with evaporating nitrogen around the ALFA station Liquid cooling of the detector/ Roman Pot Peltier element cooling for the detector/ Roman Pot (combined with air cooling for hot side) Large fan in front of each station Removed detectors from LHC NIELS BOHR INSTITUTE UNIVERSITY OF COPENHAGEN 5/6 Heating of ALFA detectors Sune Jakobsen

Heating of ALFA detectors Temperature sensors installed Temperature vs time Temperature vs number of particles Suggested counter measures Planned activities Planned activities Installing PT100 temperature sensors on the detector baseplate, Roman Pot “baseplate” and beam pipe. (Next week in the technical stop). Hope to clarify the heat propagating Fill up empty space inside the black boxes with foam to improve cooling of electronics Effect on detector temperature expected to be small Temperature cycle one layer of an ALFA detector and observed effects Details to be discussed now Also temperature cycle layer trigger? NIELS BOHR INSTITUTE UNIVERSITY OF COPENHAGEN 6/6 Heating of ALFA detectors Sune Jakobsen