Drift Chamber Status Report
Tokyo PHENIX Meeting
Milestones Achieved
Initial delay in start of net production; 2 weeks due to late delivery of small US made precision screws.
Middle October: 13 X-nets made and tested at PNPI: • 8 excellent (<2 namp)• 3 acceptable (<50 namp)• 2 sparked:
• One stray wire strand.• One poor glue application.
MECH Milestones continued
End of October:• 32 UV nets made, all excellent.
Early November:• Mechanical mods to the Large prototype begun.• Shipped 10 wire modules (2 X, 4 U, 4 V).
Middle November:• Wire modules arrive intact (no tangling)• Installation complete by Thanksgiving.
New Modules Installed
Module ProfileOld: UV cages “Tilt”
into active volumeNew: UV cages flush with end
Feedthroughs
Component Overview
The ASD/TMC card accepts chamber signals directly.
The FEM card responds to triggers and orchestrates readout of 4 ASD/TMC cards (one “Keystone”).
ASD8 = preAmp, Shaper, Discriminator (“PENN chip”)TMC = Time Memory Cell, Yasuo Arai KEK.
ASD/TMC Tests
Real ASD/TMC Card
Mini FEM => Logic analyzer
ARCNet/Timing Emulation Box:
Supplies pulses
Supplies triggers
Supplies ENDat’s
Noise Tests on ChamberOn Chamber
HV connected
reads always running
3fC threshold
TMC level
•With the scope set to 5 second persistence, we record all disc firings.
•No white noise!
•Readout noise comes from Mini-FEM
Interim Readout SolutionASD/TM C FEM
inte rna l c lo c kingHo o k fo r m a nua l trig g e rO utp ut “trig g e r a p p lie d ”
Ho o k fo r ENDa t’sN IM Bin
C o sm icTe le sc o p e
Re a l ARC Ne t
PC(La b vie w)
TTL -> DiffTwist Pa ir
Sc ra m b le r
VM E(PHO NC S)
G -2 FIFO
Units in Blue a re te m p o ra ry wo rka ro und s
MECH: Since leaving for QM97
All RC cards installed. Pure nitrogen tests, all cages at once. Corona at expected point. Need one more day of turns w/ 50-50. No measurable leaks. Vlad seems optimistic.
ELEC: Since Leaving for QM97
A-side signal boards stuffed and tested. ARCNet slave FPGA design complete. We’ll write user code in ARCNet board called from
hooks inside JF code (a standard option!). Otherwise too slow. Some code written.
g-2 blank FIFO card and most parts in hand. Pre-prod proto shipped from LLNL. Need to address:
• Cabling• DC-DC convertor mechanical details.