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VERTEX magnets of NA61/SHINE Antoni Aduszkiewicz University of Warsaw CERN, January 18, 2015 Antoni Aduszkiewicz (University of Warsaw) VERTEX magnets of NA61/SHINE CERN, January 18, 2015 1 / 4 Overview VERTEX-1 failed in September 2015

SLIDE 1

VERTEX magnets of NA61/SHINE

Antoni Aduszkiewicz

University of Warsaw

CERN, January 18, 2015

Antoni Aduszkiewicz (University of Warsaw) VERTEX magnets of NA61/SHINE CERN, January 18, 2015 1 / 4

SLIDE 2

Overview

VERTEX-1 failed in September 2015 during test at the maximum field (5000 A). The cause of the incident and the extent of the possible damage are not known, but it was found out that the event was correlated with interruption of the helium flow to the current leads. The magnet (the current leads part) was open, but no damage could be found. Installation of a new Magnet Safety System (MSS) was recommended by CERN and it is being built VERTEX-1 will be cooled down and further tests will be conducted. If damage would be found, further steps will be considered.

Antoni Aduszkiewicz (University of Warsaw) VERTEX magnets of NA61/SHINE CERN, January 18, 2015 2 / 4

SLIDE 3

Magnet Safety System installation

Procurement of the necessary parts started Installation in workshop to be done in February Installation in place to be done between beginning of March and middle of April The magnet vacuum will be closed before beginning of April so that magnet can be cooled down for May

Antoni Aduszkiewicz (University of Warsaw) VERTEX magnets of NA61/SHINE CERN, January 18, 2015 3 / 4

SLIDE 4

Status of the cryogenic system

1 / Opened cryostat of VERTEX-1: 1.1 / Controled of valve supplying LHe. Dismantled, controled the

riginal calibration of the record tare 400 mbar (1.8 bars

relative) and replaced. 1.2 / Checked the flow sensor of LHe: OK 2 / Change of water networks: Completed mechanical construction. The pressure tests must be carried out in consultation with EN/CV before commissioning. 3 / Change of logic of the gas recovery from the current leads: Partially achieved (validation ongoing). 4 / Replacement of the PAD on VERTEX-2: Intervention scheduled for next week (S3).

Antoni Aduszkiewicz (University of Warsaw) VERTEX magnets of NA61/SHINE CERN, January 18, 2015 4 / 4