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Improved DHQDS Performance with Reduced Voltage for RQX R1

Enhance the implementation and performance of DHQDS by reducing nominal voltage for RQX R1 with specific hardware and software modifications, including capacitor bank adjustments and transformer voltage changes. Acknowledging hardware consultants for their contributions.

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Improved DHQDS Performance with Reduced Voltage for RQX R1

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  1. Implementation and performance of the DHQDS with reduced nominal voltage for RQX.R1 R. Denz Acknowledgements: K. Dahlerup-Petersen, J. Mourao

  2. Hardware and software modifications Capacitor bank: 6 x 6 mF instead of 6 x 4.7 mF 850 V charging voltage 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

  3. Quench heater discharge MQXA modified MQXB 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

  4. Quench heater discharge MQXA modified MQXB 11.5 Ω MQXA 19.7 Ω

  5. 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).

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