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Update on MQM and MQY models (work in progress). W. Venturini Delsolaro Fidel meeting 26/5/2009. Outline. Scaling for operational temperature (MQM) Update on minimum pre cycle currents Fit of penetration curve, new Fidel component.

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update on mqm and mqy models work in progress

Update on MQM and MQY models (work in progress)

W. Venturini Delsolaro

Fidel meeting 26/5/2009

outline
Outline
  • Scaling for operational temperature (MQM)
  • Update on minimum pre cycle currents
  • Fit of penetration curve, new Fidel component
slide5

Isolating the “magnetization component” data and refitting the pinning exponents… (p=1, q=1.5)

summary on temperature effect
Summary on temperature effect
  • MQM35 measured in 2006 at the two temperatures
  • The Jc(T) scaling in the present model works very well
  • But for that we must not use the pinning exponents to fit others features of the data!
  • Need to re fit the RESIDUAL MAGNETIZATION. Done
  • Despite apparently possible (contrary to MQY) it is not a good idea to use RES MAG to fit penetration curves!
  • In summary a new iteration on all the components was done, before going back to the penetration curve….
fitting the penetration curves and putting all together
..fitting the penetration curves, and putting all together
  • New component (penetration):
  • Tried with A=-µ/2, did not work
  • A = -11.5 µ/2 works. Fitting points at 100A 200A and 265A
  • New range for MQM: 100 A  5390 A  350A. So far 8 apertures done with similar results (errors in units) using the same parameters.
update on minimum currents
Update on minimum currents
  • For MQY the minimum injection current is ~133A, while for MQM it is ~145 A
  • Minimum MQY current during squeeze ~ 800 A (Q5.L2)
  • Minimum MQM current during squeeze ~ 388 A (Q6.L5)
  • According to D. Nisbet, it should be possible to set the minimum operating current to 100A for the all IPQ circuits. Nominal ripple performance will be granted above 120A.
    • Special measurements on MQM become less urgent
    • Need to decide on the minimum before the start of HWC
    • Incorporate in the powering procedures, best an ECR
mqy fits update
MQY fits, update
  • Model 2008: max |ε| ~ 5 units between 176 A and 3600A
  • New model with q=19 and penetration :

gave promising results on 13 apertures down to 130 A. (Imin =100 A)

  • Now trying same penetration function as for MQM, third iteration. Ongoing
summary
Summary
  • The temperature scaling in the model fits the experiment well. From Fidel side, nothing to change
  • Need to verify that in LSA the scaling is applied, taking into account the operational temperatures
  • The best solution for the low injection currents issue seems to be: adding a component to the model thus extending its validity to cover the re-penetration curves. Work is still progressing to cover all available data.
  • REFPARM files and LSA to be adapted (very soon)
  • A small ECR needs to be issued to set I min op to 100A, to profit from the series measurement data
  • To be reflected as well in the pre cycling prescriptions...