Advancing the CERN proton synchrotron multiturn extraction towards the high-intensity proton beams frontier

B. Mikulec,S. Cettour Cave,H. Bartosik,M. Coly,V. Kain,E. Koukovini-Platia,F. Tecker,S. Gilardoni,M. Giovannozzi,D. Cotte,G. Sterbini,G. P. Di Giovanni,H. Damerau,A. Huschauer

doi:10.1103/physrevaccelbeams.22.104002

Abstract

Complementary to the physics research at the LHC, several fixed-target facilities receive beams from the LHC injector complex. To serve the fixed-target physics programme at the super proton synchrotron, high-intensity proton beams from the proton synchrotron are extracted using the multiturn extraction technique based on trapping parts of the beam in stable resonance islands. Considering the number of protons requested by future experimental fixed-target facilities, such as the proposed search for hidden particles experiment, the currently delivered beam intensities are insufficient. Experimental studies were conducted to optimize the multiturn extraction technique, pushing its capabilities in the domain of high-intensity proton beams, and their results are presented in this paper. The success of these studies led to the decision to discontinue the former continuous transfer and remove the related hardware from the accelerator. Therefore, the multiturn extraction becomes standard operational practice for delivering proton beams for the fixed-target physics programme at the CERN super proton synchrotron.

Highlights

Since September 2015, the special beam extracted from the CERN proton synchrotron (PS) for the super proton synchrotron (SPS) fixed-target physics program has been generated using the so-called multiturn extraction (MTE) technique
Two separate stages are needed for MTE, i.e., beam splitting and beam extraction proper
II, a number of detailed parameter scans are presented to assess the performance of MTE as function of the transverse excitation applied during the splitting and of the strength of the nonlinear magnetic elements

Summary

INTRODUCTION

Since September 2015, the special beam extracted from the CERN proton synchrotron (PS) for the super proton synchrotron (SPS) fixed-target physics program has been generated using the so-called multiturn extraction (MTE) technique (see [1,2,3,4,5,6,7] for more detail). The core is extracted by imparting an additional deflection by means of two more kickers In this respect, two separate stages are needed for MTE, i.e., beam splitting (to generate the suitable structures to be extracted over five turns) and beam extraction proper. II, a number of detailed parameter scans are presented to assess the performance of MTE as function of the transverse excitation applied during the splitting and of the strength of the nonlinear magnetic elements These studies were a crucial prerequisite to start beam tests at higher intensity.

PREPARATORY STUDIES

HIGH-INTENSITY TESTS

PS results

28 Æ 1 33 Æ 1 31 Æ 1

Digression

Findings

CONCLUSIONS