Circuit-protection aspects of different preliminary magnet-design options

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Presentation transcript:

Circuit-protection aspects of different preliminary magnet-design options M. Prioli, B. Auchmann, A. Verweij with input from H. Thiesen 20.11.2015, Orsay, France

Outline Overview relevant parameters. Magnet parameters from last coordination meeting (9 Oct.). Parametric study. Conclusions.

Layout From R. Schmidt, FCC week Washington, March 2015.

Circuit From R. Schmidt, FCC week Washington, March 2015.

Magnet Design Parameters Inom, Iultim. Ld@inj, Ld@ultim Stored energy E@ultim Vgnd: max. voltage to ground during fast power abort without quench or earth fault. Derived quantity: test voltage to ground, e.g., Vtest = 2*Vgnd + Vquench where Vquench includes a heater failure (LHC RB circuit). 11-T dipole 20% vairation of Ld. EE unit with central grounding point.

FPA time, EE parameters. Max. MIITs for diode (heat-sink), busbar and joint (stabilizer), and DFB leads. Derived quantity: Fast power-abort (FPA) time constant tFPA. e.g., tFPA = 100 s (LHC RB). EE design consideration: cool-down time (LHC ~2 hours), semi-conductor, electro-mechanical, or superconducting. RB EE resistor RB switch Electro- mechanical switch IGBTs on heat sink Courtesy of Knud Dahlerup-Petersen, Gert-Jan Coelingh, Alexandr Erokhin

PC Parameters PC max. voltage PC max. current PC max. power Negotiable. 2 kV may be reasonable. PC max. current 30 kA upper limit. PC max. power 60 MW? Total FCC power consumption during ramp should be minimized. LHC RB power converter.

Other Parameters Operations/Availability Cryogenics Cost Ramp rate dI/dt ~ Inom/tramp. e.g., tramp = 1800 s (here 30 min, LHC 20 min, faster?). Cryogenics Max. heating from warm-cold transitions. Cost Cost per PC ~ 1-2 MCHF* Cost per EE ~ 300 kCHF* (electro-mechanical) Cost for caverns? Free parameters Nsec number of powering sectors, min. 8. NEE number of EE units per powering sector. *… roughest of estimates!

Magnet Variants Cos-Theta Data from EuroCirCol WP5 coordination meeting on 9 Oct. 2015.

Magnet Variants Block Coils Data from EuroCirCol WP5 coordination meeting on 9 Oct. 2015.

LHC Circuit Configuration lowest Ld Nsec = 8, NEE = 2 highest Ld

Parametric Study Ncir per octant number of powering sectors per octant, Nsec = Ncir per octant * 8. Lowest inductance, lowest Nsec and NEE. Highest inductance and Vgnd =1 kV : Nsec = 64, NEE = 8.

Conclusion Circuit protection does not put hard constraints on magnet design. Low-inductance magnets are intrinsically advantageous: Reduced number of circuits and EE units. Reduced voltage in magnet during quench. Lower power consumption. Voltage-to-ground has large impact on Nsec and NEE. Need ambitious design goal and risk analysis for test voltage. Cost of PC/EE critical only for very large Nsec and NEE: Extreme example: 64 powering sectors, 8 EE units each: 128 MCHF + 154 MCHF + cavern cost. Availability considerations need to be studied. Mean-time to failure in PC, etc. For training, shorter powering sectors are advantageous.

Areas to work on Fast transient analysis Diode/busbar design EE conceptual studies