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Derived Parameters from Dipole Geometric Measurements. Introduction “Miscellaneous” parameters “Stability” parameters Mechanical twist Classification Correctors position at WP08 Technology. Introduction.

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derived parameters from dipole geometric measurements

Derived Parameters from Dipole Geometric Measurements

Introduction

“Miscellaneous” parameters

“Stability” parameters

Mechanical twist

Classification

Correctors position at WP08

Technology

Jerome BEAUQUIS AT/MAS

introduction
Introduction
  • Derived parameters are calculated (when meaningful) for all measurements : ITP15, ITP20, WP01, WP03, WP08, WP08X .
  • Those parameters are used :
    • - to evaluate the dipole stability (validation of the central foot blocking).
    • - to allocate a slot for a magnet in the machine.
  • Some are already in the ID Card, others will be soon in.
  • All parameters are stored in the Database.

Jerome BEAUQUIS AT/MAS

miscellaneous parameters
Average, maximum and minimum for ΔX and ΔZ for both apertures.

Also Body_R (maximum ΔR).

The tenth degree polynomial approximation coefficients and his longitudinal range of use (to avoid dangerous extrapolation at the extremities).

An indicator to show the quality of the polynomial interpolation of tenth and second degree.

“Miscellaneous” parameters

Jerome BEAUQUIS AT/MAS

stability parameters 1 3
“Stability” parameters (1/3)

Delta Sagitta

  • Calculated on the bend part of the dipole : 14.343 m.
  • Estimated on fitted data with a polynomial approximation of second order.
  • Convention used : a Δsagitta positive means a magnet too curved.

Courtesy of Giuseppe Gubello

Jerome BEAUQUIS AT/MAS

stability parameters 2 3

shift

curve shifted

curve no shifted

Max

“Stability” parameters (2/3)

Maximum & RMS distance

  • Calculated on two following measurements steps.
  • Estimated on fitted data with a polynomial approximation of tenth order.
  • Performed on shifted curves w.r.t external cold feet pads, with the assumption there is no transversal movement on the external cold feet pads. The shift can be different on the two feet.

Jerome BEAUQUIS AT/MAS

slide6

“Stability” parameters (3/3)

Movements of “D points” w.r.t to the fiducials

  • Enables to evaluate the movement (rotation and translation) of the cold mass w.r.t to the cryostat.
  • Calculated on two following measurements steps : WP08i and WP08i+1 .
  • A best-fit (with an Helmert transformation) is performed on the fiducials from the two steps. Then, this transformation is applied to the “D points”.

T

Fiducials adapted on the previous step

M

S

E

Jerome BEAUQUIS AT/MAS

mechanical twist
Perform to make easy correlation with the magnetic twist.

Thus a local twist is calculated with the following formula :

It is computed on 18 positions, of 0.75m long, which are corresponding to positions of the warm magnetic field measurements made in industry. Positions at extremities are excluded.

Therefore, an average and a RMS are calculated from local twist.

Furthermore, a twist integral is defined with a discrete convolution as follows :

Mechanical twist

Jerome BEAUQUIS AT/MAS

classification
Compute the racetrack (specification given by ABP) to determine the class (golden, mid cell, silver , etc) of a magnet.

For the time being, only the class is stored in the DB and not the racetrack values.

Classification

Jerome BEAUQUIS AT/MAS

correctors position at wp08
Correctors position at WP08
  • Aim : calculate the position of correctors at WP08, without measuring them.
  • Assumption : cold mass extremities are rigid, thus correctors follow movement of flanges between ITP20 and WP08.

So correctors positions at WP08 can be estimated by :

CorWP08 = CorITP20 + FlITP20FlWP08

Flanges at WP08

Flanges at ITP20

Flanges displacement

Correctors at WP08

Correctors at ITP20

Jerome BEAUQUIS AT/MAS

technology
Technology

Chaba

Software Java

1

2

Oracle DB

3

Kernel Mathematica

Measurements

4

Derived Data

Jerome BEAUQUIS AT/MAS

acknowledgements
Acknowledgements

Elena Wildner, Dominique Missiaen, Fabien Seyvet

Giuseppe Gubello, Walter Scandale

Gregory Bevillard, Christophe Podevin

Rocio Chamizo, Marta Bajko

ABP

Jerome BEAUQUIS AT/MAS