mkd stack upgrade mkd generator meeting viliam senaj 23/06/2015
TRANSCRIPT
MKD stack upgrade
MKD generator meetingViliam Senaj23/06/2015
Effect of return rod displacement
RR displacement [mm] 0Present
situation
5 10 15 20
Inductance stack [nH] 132 141 149 157 165
Inductance MKD total [nH] 2.682 2.691 2.699 2.707 2.715
Voltage @ 7 TeV [kV] 29 29.06 29.1 29.14 29.19
Emax [MV/m] 2.9 2.53 1.91 1.59 1.4
Trise increase [ns] 0 +4 + 8 +12 + 15
Solution with return rods displaced by 20 mm
• Return rod displaced by 20 mm• Araldite insulation of RR• Modified top insulator – upper tube
included• Reduced diameter of 4 upper HV
deflectors and full insulation by araldite• HV contact insulated by araldite• Modified 4 top snubber capacitors –
araldite tube around instead of HV deflectors
Solution with return rods displaced by 20 mm
Time plan
• Drawing of machining plans ~ 2 weeks• Procurement of raw material for 3 switches ~ 2 months • Machinning ~ 4 weeks• Assembly ~ 3 days • Test of single stack in HV case up to 40 kV ~ 1 week• Test inside generator ~ 6 months
Magnet current @29 kV o vs 20 mm displacement (132 vs 165 nH)
Main dividers 2 x 100 MΩ
Main dividers 2 x 100 MΩ
Main dividers 2 x 100 MΩ - solution
Main dividers 2 x 100 MΩ - solution
HV divider 10 x 5 MΩ, top deflector
HV divider 10 x 5 MΩ – solution
HV contact region - today
HV contact region - solution
Final solution
MKD E/B2 freewheel signal
MKD schematics