Download presentation

Presentation is loading. Please wait.

Published byLeslie Winslett Modified over 2 years ago

1
UpstreamDownstream S PECIFYING A MAGNET Key: A coil Position of upstream edge Inner radius Current in coil Conductor This is a generic magnet, it’s not meant to look like the SS or AFC. We can model any magnet we want!

2
F ITTING A FIELD MAP Mixing/Scaling fit procedure: 1.Take data in cylindrical co-ordinates a)In this case using a pre- calculated map based on SS. 2.Make two detailed field maps with parameters that “bracket” our best guess at the real paramters 3.Minimise for “best fit” parameters: a)Mixing of the detailed field maps b)Length scale of the detailed field maps c)Field scale of the detailed field maps Two methods: Mixing/scaling fit Full 20+ parameter coil fit – takes FOREVER for SS

3
F ITTING A FIELD MAP Mixing/Scaling fit procedure: 1.Take data in cylindrical co- ordinates a)In this case using a pre- calculated map based on SS. Again, a generic magnet Spectrometer Solenoid parameters

4
F ITTING A FIELD MAP Mixing/Scaling fit procedure: 2.Make two detailed field maps with parameters that “bracket” our best guess at the real parameters Original magnet “Long, thin” bracketing magnet “Short, fat” bracketing magnet

5
F ITTING A FIELD MAP Mixing/Scaling fit procedure: 2.Make two detailed field maps with parameters that “bracket” our best guess at the real parameters

6
F ITTING A FIELD MAP Mixing/Scaling fit procedure: 3.Minimise for “best fit” parameters: a)Mixing of the detailed field maps b)Length scale of the detailed field maps c)Field scale of the detailed field maps

7
A SIDE : I NTERPOLATING FIELDS How well does this work? (weakest link) Lesson: Make sure the bracketing fields are calculated on a finer grid than the data! 1e-15

8
F ITTING A FIELD MAP Few grid points Many grid points

9
F ITTING A FIELD MAP zoomed y-scale

10
F ITTING A FIELD MAP zoomed y-scale

11
I MPROVEMENTS TO COME : Need to account for longitudinal offset + two rotations This is included in the 20+ parameter fit, but is far too slow for the SS map Adding Fourier-Bessel fit to account for residual field (green plots) will improve our map further. Also helps account for Virostek plate longitudinal offset + in/out of screen rotations

Similar presentations

OK

IK March 1st 2012 Slide 0 EMMA: Update on BPM modelling and mapping March 1 st 2012 Ian Kirkman.

IK March 1st 2012 Slide 0 EMMA: Update on BPM modelling and mapping March 1 st 2012 Ian Kirkman.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on genders for grade 1 Ppt on earth dam failures Ppt on product advertising samples Ppt on ganga river system Ppt on live line maintenance tools Ppt on power generation by speed breakers Ppt on engineering college life Download ppt on live line maintenance tools Perspective view ppt on iphone Ppt on english language learning