N. Catalan Lasheras

Construction and qualification of the pre-series MQM superconducting quadrupoles for the LHC insertions

The LHC insertions will be equipped with individually powered MQM superconducting quadrupoles, produced in three versions with magnetic lengths of 2.4 m, 3.4 m, and 4.8 m. The quadrupoles feature a 56 mm aperture coil, designed on the basis of an 8.8 mm wide Rutherford-type NbTi cable for a nominal gradient of 200 T/m at 1.9 K and 5390 A. A total of 96 quadrupoles are in production in Tesla Engineering, UK. In this report we describe the construction of the pre-series MQM quadrupoles and present the results of the qualification tests.

Fabrication of the pre-series wide aperture superconducting quadrupoles for the LHC insertions

Individually powered superconducting quadrupoles with a coil bore of 70 mm will be installed in the LHC insertions, in areas where increased geometrical acceptance and improved field quality are required. The quadrupoles feature a four-layer coil, designed on the basis of two graded 8.3 mm wide Rutherford-type NbTi cables. The magnets have a magnetic length of 3.4 m and a nominal gradient of 160 T/m at 4.5 K and 3610 A. A total of 26 quadrupoles are in production at ACCEL Instruments (Germany). In this report, we present the experience in fabrication of the pre-series magnets and the results of the initial qualification tests.

Sensors applications within the research framework of the PACMAN project on metrology for particle accelerators at CERN

Within the framework of the Compact Linear Collider Study (CLIC) [1] at CERN, new sensing and actuators technologies must be developed in order to achieve the required performance. An ITN Marie Curie Skowoska project funded by the European Union was launched in 2013. This project is a study on Particle Accelerator Components Metrology and Alignment to the Nanometre Scale, named PACMAN [2]. The project team consists of ten early stage researchers, divided in four work packages focusing on different tasks. Each of them is developing innovative transducers overperforming the current state of the art. Their main tasks are high-precision metrology and fiducialization, magnets prequalification and determination of magnetic axis under the constraint of small aperture (below 10 mm), determination of electrical center of a 15 GHz Radio Frequency-Beam Position Monitor (RF-BPM) and the electro-magnetic axis of an accelerating cavity, improvement of an existing seismic sensor to guarantee an optimized alignment process. The project has now been running for two years at CERN, resulting in dramatic progress for each of the early stage researchers. Their work already lead to building new experiments and proofs of concepts that are to be assembled in a unique, flexible, and compact test bench.

Preliminary RF design of an X-band linac for the EuPRAXIA@SPARC_LAB project : arXiv

Abstract In the framework of the upgrade of the SPARC_LAB facility at INFN-LNF (Frascati, Italy), named EuPRAXIA@SPARC_LAB, a high gradient linac is foreseen. One of the most suitable options is to realize it in X-band. A preliminary design study of both accelerating structures and power distribution system has been performed. It is based on 0.5 m long traveling wave (TW) accelerating structures operating in the 2 π ∕ 3 mode and fed by klystrons and pulse compressor systems. The main parameters of the structures and linac are presented with the basic RF linac layout.

Summary of Sessions A and D: Lattices, Beam Loss Handling and Collimation & Diagnostics and Instrumentation

Although beam loss handling is not a new discipline, the main challenges have evolved substantially with the increasing energy and intensity of accelerators. Initially, decreasing electronic noise and signal background for collider experiments was the main reason to collimate the circulating beam. The recent use of superconducting technologies demands the removal of halo particles that could be potentially lost and trigger a quench in the structure. In high brightness accelerators, the high power contained in the beam could damage hardware components and hinder operation. In parallel, the development of high power machines with high duty factors makes residual radioactivity a key limitation for maintenance and ultimate performance. Sources of beam losses and the different systems used to remove them before they become harmful were the subject of the first session summarized here.