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Preliminary Studies of Quench Protection for MQXE & MQXF

Preliminary Studies of Quench Protection for MQXE & MQXF. Massimo Sorbi and Giulio Manfreda Milan University & INFN LASA Udine University. Introduction:. The study was aimed to calculate the hot spot temperature in case of quench for the: MQXE-HQ (aperture diameter 120 mm)

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Preliminary Studies of Quench Protection for MQXE & MQXF

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  1. Preliminary Studies of Quench Protection for MQXE & MQXF • Massimo Sorbiand Giulio Manfreda • Milan University & INFN LASA • UdineUniversity M. Sorbi

  2. Introduction: • The studywasaimed to calculate the hot spot temperature in case of quench for the: • MQXE-HQ (aperture diameter120 mm) • MQXF-old design (aperture diameter 140 mm) • MQXF-new design (aperture diameter 150 mm) • The calculationshavebeenperformed with QLASA (analytical code, with analyticalevaluation for quenchvelocity) and with ROXIE (FE calculation of heatdiffusion) • In both the codes the materialproperties of MATPRO (materiallibrary of LASA) havebeenused. • The agreement of the results for both the codesisverygood. M. Sorbi

  3. Magnets main parameters M. Sorbi

  4. MQXE-HQ (120 mm) MQXF-old (140 mm) MQXF-new (150 mm) M. Sorbi

  5. The hot spot temperature calculationhasbeenperformedassuming: The magnetisconsideredas standing alone, i.e. not in serie with othermagnet. At time=0 a quench start in the high fieldconductorregion. The QDS detects the quenchassoonas the resistive voltagereaches the thresholdvoltageVqds (Vqds = 100 ÷ 300 mV). The protectionsystemactivates the heaters and the aperture of the powersupplyswitch. Boththesetwooperationsbecomeseffective with a same delay time (td = 10 ÷ 40 ms). The heaters cover all the magnetlength and both the layers. In the conductorenthalpy, also the contribution of insulationisconsidered (the insulatedconductorMIITs are sensiblelargerthan bare conductorMIITs) A parametricstudyhasbeenperformed, varying the Vqds and td. M. Sorbi

  6. Hot spot temperature calculation Tipicalworkingrange MQXE-HQ (120 mm) MQXF-old (140 mm) M. Sorbi

  7. Hot spot temperature calculation Tipicalworkingrange MQXF-new (150 mm) M. Sorbi

  8. Conclusion • The agreement between ROXIE and QLASA regarding the hot spot temperature prediction is reasonably good. • The MQXF-old design (140 mm) and MQXF-new design (150 mm) presents about the same behavior of the hot spot temperature vs. the delay time & Vqds threshold voltage. • The MQXE-HQ magnet presents a slight larger value of hot spot temperature: this is main due to the double effect of lower value of MIITs and larger value of magnetic-energy/conductor-volume • The hot spot temperature of MQXF-new design (150 mm) can be considered save (T < 300 K) with a delay of 20-25 ms for the effectiveness of quench heater and with Vqds of 100-200 mV: both these values are feasible if compared to the experience. • If the magnets are connected in seriewith the same power supply, the calculation has to be re-execute, and by-pass diodes per each magnet are necessary. M. Sorbi

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