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Field Quality Working Group

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Mandate

Monitor the magnet field quality versus requirements: transfer function, field harmonics, dynamic behaviour (snap-back, dB/dt), for all super-conducting and warm magnets, including the experimental magnets.

Investigate the solutions required to minimize the consequences if a magnet is partially out of spec.: sorting, correction strategy, proposals for modification of the manufacturing, use of the safety margin and make recommendations to MEB.

Review the criteria for distribution of components (Sc cables, correctors types, etc.) and advise the group in charge for the optimal distribution for the FQ and for Installation scenario.

Evaluate the impact of the geometrical imperfections and of misalignment on the field quality. Define prescriptions in collaboration with the WGA.

Monitor the statistical evolution (trends) of the field quality and alignment measured, evaluate consequences and propose relevant preventive actions. Make recommendations as to the choice of the reference magnets.

Make recommendations on the measurement strategy to fulfill the requirements.

Ensure that the proper tools are available for a fast and efficient judgment of the field quality: measured field imperfection database, optics database, communication between both, models,...

Review critically and periodically the beam dynamics acceptance criteria and thresholds for field harmonics and alignment (dynamic aperture, diffusion in amplitude and tune, frequency maps, scaling laws...).

Provide assistance to Groups in charge of magnet design and procurement for FQ definition and steering. Provide advise and guidelines to Magnet Groups for acceptance (or non acceptance) of marginal magnets.

Ensure that all the information is available in appropriate form to facilitate the commissioning.

Report to: MEB, LTC and MARIC

The working group will invite other persons whenever needed and adjust the membership in the light of experience.

President: J-P. Koutchouk

Scientific secretary: E. Todesco

Advisors: R. Wolf, L. Walckiers and W. Scandale will be invited at milestones as advisors

We acknowledge M. Catin for helping us to distribute information managed by the working group. The present working group continues the work of the FQWG chaired by L. Walckiers active in 1998-2000 (see web site).


Members

Jean-Pierre Koutchouk (AT-MAS)

Oliver Bruning (AB-ABP, beam dynamics and machine database)

Stephane Fartoukh (AB-ABP, beam dynamics and machine database)

Massimo Giovannozzi (AB-ABP, beam dynamics and machine database)

Ioannis Papaphilippou (AB-ABP, beam dynamics and machine database)

Bernard Jeanneret (AB-ABP, alignement working group chairman)

Arjan Verweij (AT-MAS, superconducting theory and cables)

Davide Tommasini (AT-MAS, main dipoles and quadrupoles)

Elena Wildner (AT-MAS, warm measurements database and analysis)

Ezio Todesco (AT-MAS, warm measurements analysis, field calculations)

Stephan Russenschuck (AT-MEL, insertion magnets, field calculations)

Bernard Auchmann (AT-MEL, insertion magnets, field calculations)

Mikko Karppinen (AT-MEL, correctors magnets)

Vittorio Remondino (AT-MEL, correctors magnets)

Luca Bottura (AT-MTM, cold measurements database and analysis, reference magnets)

Laurent Deniau (AT-MTM, cold measurements database and analysis, reference magnets)

Stephane Sanfilippo (AT-MTM, cold measurements database and analysis, reference magnets)


Distribution lists

Members (Jean-Pierre.Koutchouk@cern.ch; Oliver.Bruning@cern.ch; Stephane.Fartoukh@cern.ch; Massimo.Giovannozzi@cern.ch; Bernard.Jeanneret@cern.ch; Arjan.Verweij@cern.ch; Davide.Tommasini@cern.ch; Elena.Wildner@cern.ch; Ezio.Todesco@cern.ch; Stephan.Russenschuck@cern.ch; Mikko.Karppinen@cern.ch; Luca.Bottura@cern.ch; Bernard.Auchmann@cern.ch; Laurent.Deniau@cern.ch; Stephane.Sanfilippo@cern.ch; Ioannis.Papaphilippou@cern.ch)

Advisors (Walter.Scandale@cern.ch; Louis.Walckiers@cern.ch; Rob.Wolf@cern.ch)

For information (Lyn.Evans@cern.ch; Steve.Myers@cern.ch; Philippe.Lebrun@cern.ch; Norbert.Siegel@cern.ch; Lucio.Rossi@cern.ch; Jean-Pierre.Riunaud@cern.ch; Karl.Hubert.Mess@cern.ch; Ranko.Ostojic@cern.ch; Strait@fnal.gov; Paul.Collier@cern.ch; Theodor.Tortschanoff@cern.ch)

Invitation to sessions - sent by E. Todesco via e-mail to Members, Advisors and special guests of that session.

Provisional Minutes - prepared by E. Todesco and JPK, distributed by e-mail (web address only) with the invitation of the successive FQWG to Members, Advisors and special guests of that session.

Approved Minutes - they are approved in the following FQWG and e-mail distributed to Members, paper distributed to Advisors, For Information (with the inclusion of Todesco and Russenschuck, and with the exception of Strait, who is e-mail distributed)

Provisional Actions - prepared by E. Todesco and JPK, distributed by e-mail (web address only) to Members, Advisors and special guests of that session.

Approved Actions - they are approved by e-mail and distributed by e-mail (pdf file) to For Information, cc Members and Advisors


Ezio Todesco fecit, last updated A.D. 2005