Abstract
Optics interlock system for the CERN LHC: Implementation and operational experience
Highlights
The Large Hadron Collider (LHC) is a 27 km long synchrotron that collides two counterrotating beams in four interaction points (IPs), which host the particle physics experiments ATLAS, ALICE, CMS, and LHCb
The main change in the final configuration with respect to the previous year was a reduced β-function of βà 1⁄4 40 cm at the collision points of the two general-purpose experiments ATLAS (IP1) and CMS (IP5) that require high luminosity [3]. This value is 15 cm below design [4] and was made possible by using a new scheme of collimator settings and optics proposed in Ref. [5], which is summarized below
For the protection during an asynchronous beam dump the phase advances between the MKD and TCTs in IP1 and IP5 are the most critical, during minimum-βà operation, i.e., after the βÃ-squeeze, when the β-function in those interaction points is reduced from the large injection to the small physics values
Summary
The Large Hadron Collider (LHC) is a 27 km long synchrotron that collides two counterrotating beams (socalled B1 and B2) in four interaction points (IPs), which host the particle physics experiments ATLAS, ALICE, CMS, and LHCb. The main change in the final configuration with respect to the previous year was a reduced β-function of βà 1⁄4 40 cm at the collision points of the two general-purpose experiments ATLAS (IP1) and CMS (IP5) that require high luminosity [3] This value is 15 cm below design [4] and was made possible by using a new scheme of collimator settings and optics proposed in Ref. For the protection during an asynchronous beam dump the phase advances between the MKD and TCTs in IP1 and IP5 are the most critical, during minimum-βà operation, i.e., after the βÃ-squeeze, when the β-function in those interaction points is reduced from the large injection (βà 1⁄4 11m) to the small physics (as small as βà 1⁄4 0.25m in 2018) values.
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