Mating the OFC

1
Mating the OFC Gas Vessel

• Winding Outer Field Cage
• Mating OFC Gas Vessel
• OFC Check
• Moving the Central Membrane

2

The STAR TPC Under Construction at LBL

• First Successful Mating of
• Gas Vessel
• Outer Field Cage
• Sector Wheels
• Central membrane

3
Outer and Inner Sectors of the Pad Plane

• 24 sectors
• 12 on each side
• Large pads for good dE/dx resolution in the Outer
  sector
• Small pads for good two track resolution in the
  inner sector

4
TPC Sector Detail

• Pad Plane
• Anode
• Individually terminated anode wires limit
  cross-talk
• Ground Shield
• Gating Grid

5
Sector Insertion Tool
Sector Repairs Maintenance
6
TPC Front End Electronics

• FEE
• Pre-amp, shaper buffer
• Switched capacitor array ADC
• 137,000 channels
• 32 channels per board
• gt 4,500 boards tested, 4,344 installed
• Readout (RDO) board
• 6 x 24 144 in total system
• 160 fabricated, being tested
• 6 RDO boards used in Cosmic ray tests
• minor tune-up required
• All Low Voltage power supplies installed

Used in Main TPC Use SCA in SVT
Used in FTPC Use in BRAHMS
7
The TPC arrives at BNL from LBL on 11/6/97
8
Magnet Operation Mapping

• The Magnet has achieved full field operation
• Mapping is complete for 1/2 field and full field
  settings

9
Insertion of the TPC into the Magnet 12/2/98
10
Picture of the Day on the WWW 12/17/98
11
The TPC in the Collision Hall
4/15/99