| Internal Note | |
| Report number | CERN-ACC-NOTE-2024-0021 |
| Title | The Acceptance Box - A Simple Diagnostics Tool for Source Optimization and Transverse Beam Matching |
| Author(s) | Koopmans, Marten Henrik (CERN) ; Lallement, Jean-Baptiste (CERN) ; Lombardi, Alessandra (CERN) ; Marchetti, Emanuele (Politecnico di Milano (IT)) ; Pasino, Eleonora (Università degli Studi e INFN Milano (IT)) ; Sargsyan, Edgar (CERN) |
| Corporate author(s) | CERN. Geneva. ATS Department |
| Publication | 2024 |
| Imprint | 04 Nov 2024 |
| Subject category | Accelerators and Storage Rings |
| Accelerator/Facility, Experiment | CERN LINAC4 |
| Keywords | Acceptance Box ; Transverse Phase Advance ; Transverse Emittance Diagnostics ; Ion Source and LEBT Optimization |
| Abstract | The measurement of the emittance and Twiss parameters of a low to medium energy ion beam is a time intensive procedure and requires special hardware as well as data acquisition and analysis. Especially for the commissioning and optimization of sources and Low Energy Beam Transport (LEBT) lines for the injection into Radio Frequency Quadrupoles (RFQs) it is however not always necessary to have the full phase space information of the beam. The main question is often just to know how much of the ion beam falls into the transverse RFQ acceptance and can be accelerated. For this purpose, the so-called RFQ acceptance box has been developed at CERN. It reproduces the transverse RFQ acceptance and in combination with a Faraday cup allows for fast methods to optimize the source and the LEBT to match the beam to the RFQ. In this paper the general principle of the acceptance box and how to define its parameters is introduced starting from basic beam dynamics. Examples of acceptance boxes produced for different RFQs at CERN are presented. Finally, the working principle of the acceptance box is validated with simulations and measurement. |
| Submitted by | [email protected] |
Record created 2024-11-08, last modified 2024-11-08
