1. Status report MEG DC /6/06
Test in COBRA Hajime,Matthias,Johny Peter : beam, Wataru : COBRA
Necessary Modifications in DC construction
Conclusions and schedule
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11. 33 : DRS
50 : Accelerator
80+ n*16: VME + ?
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17. Wire 0 (short, low rate) Wire 4 (middle) Wire 8( long, high rate, frame near beam)HV
1500
1600
1800
1900
2000
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20. DC Construction DC test in COBRA e+ efficiently seen by real DC
high pulses „rare“ for DC, effects to be studied in „DRS“
Intensity is large, aging effects have to be taken in account in optimization
specific beam-COBRA electronic noise not very important
DC Construction
Carbon fiber gluing : 2 sets Cathode-Hood not correctly glued  set of tests to be sure that error is completely understood Andrei+Nicolai back  production restarted
HV Dark current and mini-sparking : first amelioration not enough efficient  started systematic study after beam-COBRA test and group complete all existent anodes tested in air at 1000 V, with anode preamps from bare anodes to “complete chambers” with cathodes and hood without foils [ first results : 6 nA on 1 Side HV capacitors from total 25 nA]  partial redesign of anode prints and isolator to facilitate a cleaner tight gluing  ~10 days delay
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21. DC Test Other components
With dummy bag too slow changes  only to test Pressure stabilization:  build second aquarium
64-96 DRS channels  DC test tool
VME electronic noise to be optimized
Other components
DC support : cable duct ( panels)
Cable label printer
Pump, preamp, panel,…
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22. Anode Conclude study of noise Redesign Prints and isolators
Hood and Cathode Optimize production
Goal : DC production and installation -> middle August
: Calibration -> in pM(N) –beam (number of DRS ?)
-> > 2 weeks ?
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