The IR1 region is submitted to a magnetic field due to the quadrupole magnets, the solenoid field from ATLAS.

 

Regions	Data file	Descriptions
2 T Solenoid field		analytic description It is only valid inside the BP vacuum chamber
MQXA magnet	MQXA_foc.dat	4 layer quadrupole ( KEK magnet) 2D description Defocussing magnet for the proton going towards the IP Focussing magnet for the debris coming out from the IP
MQXB magnet	MQXB3_map2.dat	2 layer quadrupole ( Fermilab magnet) 2D description Defocussing magnet for the proton going towards the IP Focussing magnet for the debris coming out from the IP

FLUKA needs a magfld routine to describe all the different magnetic fields in the insertion region. Different routines have been created for different configurations.

 

Magfld routines	Descriptions
magfld_2mqx_dp.f 30/03/07	analytic description of the solenoid field for ATLAS ( update correction for the radius parameter in m in the analytical definition) 2 types of quadrupole MQXA ( Q1 and Q3 ) and MQXB (Q2a qnd Q2b) are described, with the magnetic configuration FDDF for the debris coming out form the IP. double precision fortran routine
magfld_2mqx_dp_scale.f   last update 2/04/07	idem magfld_2mqx_dp.f rescaling of the magnetic fields of the quadrupoles for an operating gradient of 203.716 T/m MQXA: s=203.716/224 MQXB: s=203.716/216

Christine Hoa:  christine.hoa@cern.ch
Elena Wildner: elena.wildner@cern.ch
Jean Pierre Koutchouk: jean-pierre.koutchouk@cern.ch
Guido Sterbini: guido.sterbini@cern.ch

Francesco Broggi: francesco.broggi@cern.ch