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Implementation and performance of the DHQDS with reduced nominal voltage for RQX.R1

R. Denz

Acknowledgements: K. Dahlerup-Petersen, J. Mourao

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Hardware and software modifications

Mains transformer:Secondary voltage rating changed

QPS supervision:QPS_OK setting changed for signal U_HDS_2_Q2 to 0.95 * 800 V = 760 V

Capacitor bank:6 x 6 mF instead of 6 x 4.7 mF850 V charging voltage

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Quench heater discharge

U_HDS_2_Q2 = 850 V 820 V across heater strip (Rcable = 0.7 Ω , Rheater = 19.0 Ω)Uearth = |410 V| during nominal discharge Uearth_max = |820 V| during discharge and capacitor bank fuse blown

MQXBMQXA modified

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Quench heater discharge

MQXA19.7 Ω

MQXB11.5 Ω

MQXA modified

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Quench heater discharge

Enominal = 2.65 kJ

Emodified = 3.03 kJ

To be re-checked after LS1 as the length of warm cables will increase (relocation of protection systems within R2E campaign).