ROXIE models

	There are 2 different cross-sections of MQ. The original one is called XSEC1 for
	cross-section 1. It was discovered during production that the b6 multipole was systematically
 	out of tolerance such that the integrated b6 for the entire LHC would have been exceeded. 
	Therefore a cross section 2 was introduced by adding two mid-plane shims. One for the Horisontal
	and one for the Vertical plane. This is described in LHC Project Note 886. The shim thickness is 125
 	microns. Magnets of both cross-sections are present in LHC since the b6 budget is global.

	During the production we had signficant spread in transfer function caused by collar steel with
	too high permeability. This affected the low-current warm measurements. It was assumed that this
	effect would largely disappear at 1.9 K operating temperature, and the warm measurements were 
	corrected for this effect. In addition, sorting were done by the MEB working group, in charge of
	slot allocation.

	Since only 5% of the MQ population was measured at 1.9 K, the "warm to cold" correlations for 
	the transfer function ( G dl / i ) and allowed harmonics (b6, b10) play a significant role 
	for establishing the operating conditions. 

MQ_2D_Aperture_XSEC1

	Single aperture + collars, original cross-section 1

MQ_2D_Aperture_XSEC2
	
	Single aperture + collars

MQ_2D_ColdMass_XSEC1

	2 apertures of cross section 1 plus common iron yoke
	No collars beause ROXIE 10 does not work with both collars + yoke

MQ_2D_ColdMass_XSEC2

	2 apertures of cross section 2 plus common iron yoke
	No collars beause ROXIE 10 does not work with both collars + yoke

Related EDMS CDD drawings

	LHCMQ_CS0021 general assembly with ref to many other drawings, approved 28.10.2005
	LHCMQ_IS0014 coil layout, approved 08.03.2005
		     Note error in table inside drawing wrt y, alpha for block 2 and 4
	LHCMQ_C_0004 collar, approved 24.04.1998
	LHCMQ_CS0024 mid-plane shim for cross section 2, approved 18.08.2004
	LHCMQ_M_0004 iron yoke, approved 22.06.1998
	LHCVSSB_0080, 81, 83 beam screen, approved 20.10.2003 (80) and 23.11.2009 (81, 83)

References
	
	Original ROXIE model by B. Auchmann
	Conversion to ROXIE 10 by B. Auchmann
	QA check by B. Auchmann and P. Hagen

This document updated August 2010 by P. Hagen