1 / 9

Analysis of Heating and Cooling in Measured DT of MKI D5R8: Operational Guidelines and Upgrades

This report analyzes the heating patterns and cooling behaviors of the MKI D5R8 magnet under specific operational conditions. Utilizing data from stable beam fills lasting over 10 hours, a semi-empirical model predicts behavior based on beam power and cooling mechanisms. Preliminary findings include cooling coefficients derived from observed curves and considerations for potential upgrades, including reducing heating through better bunch shaping and new shielding designs. The study emphasizes the derivation of operational limitations and enhancements for future performance.

leiko
Télécharger la présentation

Analysis of Heating and Cooling in Measured DT of MKI D5R8: Operational Guidelines and Upgrades

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Large spread in measured DT (10 – 40 deg)

  2. Take worst case MKI.D5R8.B2:TEMP_MAGNET_DOWN

  3. Analysis of heating • Took all fills (to end September) where in stable beams for longer than 10 h • Considered only time from top of ramp onwards • Used number of bunches, average bunch current and bunch length as inputs • Fitted initial heating rate (~linear) over first 2 hours

  4. Analysis (to end September)

  5. Dependencies

  6. Can we model including cooling? • Semi-empirical model makes reasonable predictions • Replicates cooling after about 12 h • Assuming heating from beam power ( Nb, Ib^2, 1/Lb^2), cooling from radiation ( DT^4) and from conduction ( DT)

  7. Cooling coefficients • Use cooldowns at technical stops or MDs

  8. To do... • Fit all fills with same heating and cooling coefficients • Already started to extract cooling coefficients from the cooling curve when beam switched off • Update with October data • Extrapolate to 2012 and beyond • Derive some ‘operational’ limitations

  9. Concerns and possible upgrades • Reducing heating of MKIs • Reduced bunch length/better bunch shaping • New shielding with more stripes • Question – are temperature rises lower on kickers with more stripes? • Metalised chamber • Improving vacuum in MKIs • NEG coating of 2nd chamber? • Solenoids around 2nd chamber? • New SIS or SS interlocking/procedures? • UFOs in ceramic chambers with kicker pulsing • Coating? Cleaning? • Clearly need to group any upgrades and have common study with all aspects considered

More Related