Master Thesis

PUBDB-2019-03220

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnet Characterization and Beam Profile Monitor Development for a Spectrometer at the ARES Linac

Jaster-Merz, S. M. (Corresponding author)DESY*

2019

This record in other databases:

Please use a persistent id in citations: doi:10.3204/PUBDB-2019-03220

Abstract: The aim for size and cost reduction of particle accelerators has generated great interest in thedevelopment of novel acceleration techniques beyond the current radio frequency based technology.Those techniques are, for example, dielectric laser accelerators (DLAs) and have thepotential to reduce the size and costs, due to their high field gradients and small acceleration periods.DLAs consist of structures which are characterized by apertures in the µm range, leadingto electron-bunch charges in the pC range. At the SINBAD (Short and INnovative Bunches andAccelerators at DESY) facility at DESY, various techniques are foreseen to be investigated usingthe ARES (Accelerator Research Experiment at SINBAD) linear accelerator. To prove thatan energy gain was achieved with these techniques, the electron energy needs to be measureddownstream of the novel acceleration structures. This is done using a spectrometer, consistingof a dipole magnet and a beam profile monitor. Based on the accelerator design, electronbeam parameters and operational mode, the spectrometer components need to fulfil various requirements.The dipole current, for example, needs to be adjustable to different electron beamenergies with a reproducible and sufficient field quality. The beam profile monitor needs to beable to detect charge densities below 1.2 aC per µm² with a spatial resolution in the 100 µmrange.In the frame of this work, two dipoles were measured, their suitability for the spectrometerdiscussed, and a dipole for installation at ARES was chosen. The requirements on thebeam profile monitor are challenging to fulfil with conventional screens, due to the expectedlow-charge densities. Therefore, a dedicated detector called STRIDENAS (STRIp DEtectorfor Novel Accelerators at SINBAD), able to resolve these low-charge beam densities, has beendeveloped and is presented in this work. This project was realised as an internal DESY collaboration,combining the resources and expertise of the MPY-1 and FH-ATLAS groups, variousmanufacturing groups, as well as the detector development group of the University of Hamburg.The design, development and tests of different components like the sensors or readoutelectronics, and the commissioning of a detector prototype, are presented. This includes thecharacterization of several sensors, as well as an estimation of the produced charge in the sensorand its spatial resolution based on simulations, which was found to fulfil the requirements.The detector components were tested individually at the DESY II Test Beam with a low electronintensity. Tests of the readout electronics, as well as tests of the sensor with an additionalamplifier, were performed, and the results are presented and discussed in this work.

Note: Masterarbeit, University of Hamburg, 2019

---

Contributing Institute(s):

1. Beschleunigerphysik Fachgruppe MPY1 (MPY1)
2. LHC/ATLAS Experiment (ATLAS)
3. Technische Projektierung (MEA1)

Research Program(s):

1. 631 - Accelerator R & D (POF3-631) (POF3-631)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2019

---

Database coverage:

---