ALICE TPC field cage status Sardinia May 2004 Michael Hoch Cern-TA2
Field Cage Feb. 04 Strips on the muon side completed
Temperature sensors inside the volume 4-wire Pt 1000 sensors purchased –50 pieces with 1m wire Calibrated to two calibr. reference pt1000 –(±3mK at 20 degree) –Calibration range between ~7- 25 degree –Residuals fit by Danilo -> ±10mK
Shaft side temperature sensors Glued on to the skirt of the 18 sectors
Muon side temperature sensors 4 sensors at the inner cylinder
Shaft side connectors and feed- troughs Pt 1000 Skirt supply Last resistors guard ring chains Last resistors R-rods Last strip supply
Electrical connections inside
Map of all connections on the endplate
Field Cage March 04 Once more HV test (1500V between strips) & cleaned -Muon side completed-
Displacement rails mounted turning clamp
Field cage turn over
Resistor rod RR final assembly
Resistor selection Resistor dispersion results in a field distortion of maximal 40 m (presented by Danilo; status field cageFeb. 04)
Resistor Rods shaft side
<< Resistor Rod outlet on the endplate Resistor Rods shaft side Hooks on the outlet side >>
Resistor rod shaft side HV tests 1500V between hooks 15kV between Al-guard rings 120kV in the test box
Resistor rod shaft side HV tests
Rod installation
Laser system control Laser beam mapping by Borge Cross checked by Rainer
central membrane 0.8mm wire connecting the outer and inner CE-flange Conductive glue -> CE-flange-Al-Mylar foil
Potential strips shaft side
visit from GSI
Shaft side strips finished
I-bar survey system tests
I-bar survey: BCAM system test Bicam system tests with Panos Christakoglou
Outlook: Installation of 18 pt1000 inside the volume Electrical connection/ feed troughs Test HV: – 1500V between each strip –120kV Cleaning of the volume Installation of external temperature sensors Turning of the field cage, closure of the volume He & final integral leak test Installation of the charge to the sliding feeds
Thank you for your attention TPC meeting Sardinia May 2004 Michael Hoch CERN TA2