RHIC AC dipole design and construction

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268), 2001

In this report we will describe the muon collider target test beam line which operates off one branch of the AGS switchyard. The muon collider target test facility is designed to allow a prototype muon collider target system to be developed and studied. The beam requirements for the facility are ambitious but feasible. The system is designed to accept bunched beams of intensities up to 1.6x10 13 24 GeV protons in a single bunch. The target specifications require beam spot sizes on the order of 1 mm, 1 sigma rms at the maximum intensity. We will describe the optics design, the instrumentation, and the shielding design. Results from the commissioning of the beam line will be shown.

2007

A summary is given of results from the first year of Muon Collider Task Force activities, together with a description of an updated longer-term R&D plan. In particular, this report summarizes Muon Collider ring and ionization cooling channel design and simulation studies, progress towards testing a high-pressure RF cavity in a beam at the Muon Test Area, Helical Cooling Channel design and simulation studies, progress towards a fourcoil helical solenoid test, design considerations for a 6D cooling experiment, and High Temperature Superconductor magnet and conductor studies for a high field solenoid at the end of a Muon Collider cooling channel. the "high-emittance" Muon Collider scheme. The "low emittance" scheme will require something extra, beyond either an HCC or a Guggenheim channel. The additional cooling idea that is being explored has been called Phase Ionization Cooling (PIC). Although there has progress on developing the PIC concept it is not yet sufficiently understood to enable design studies to begin based on tracking simulations of a PIC channel. Further PIC studies must be pursued in the coming year. High Pressure RF Studies: The present designs for the phase rotation and cooling channels require high gradient RF cavities to operate in magnetic fields of up to a few Tesla. MUCOOL R&D has shown that when operated in a magnetic field vacuum pillbox cavities breakdown at lower gradients. The continuing MUCOOL R&D program is exploring ways to mitigate this effect, using alternative materials, surface treatments, and magnetic geometries. Previous measurements with open cell vacuum cavities showed no significant performance degradation in a magnetic field, however open cell cavities require a doubling of the required peak RF power and a corresponding increase in cost. Muons Inc. has proposed an alternative and potentially cost effective solution using cavities filled with high pressure gas to both suppress breakdown and provide the energy loss absorber. A High Pressure RF (HPRF) test cell has been shown to operate in a magnetic field with no appreciable reduction in the achievable RF gradient. However, these tests were made in the absence of an ionizing beam. The next significant step towards understanding the viability of a cooling channel using HPRF cavities is to study operation in an ionizing beam of appropriate intensity. The main focus of the MCTF RF activities in the last year has been to prepare a HPRF beam test in the MUCOOL Test Area (MTA). This requires extracting a linac beam and transporting it to the MTA. In the last year the beamline design has been completed, beamline components are have been refurbished and refitted, and four new elements built and installed: two identical beam stops and two extraction magnets (C-magnets). The beamline, instrumentation and vacuum elements, as well as utility systems, have also been installed. Completing the MTA beam capability and making the first HPRF test with beam is a priority for our MCTF activities in the coming year. The HCC requires the development of an appropriate magnet system. Two conceptually different designs have been investigated. The first is the large bore "conventional" design which consists of a solenoid coil with separate helical dipole and quadrupole coils wrapped around it. The second is a small bore "helical solenoid" consisting of many individual coils arranged in a helical pattern. The helical dipole and quadrupole components are generated by the coil offsets and radii. The helical solenoid version introduces some design constraints, but is significantly easier and cheaper to build, and has emerged as the preferred solution. As a first step toward building a helical solenoid magnet that can be tested in a beam, it is planned to build a subscale model with four solenoid coils that fits within the Technical Division Vertical Magnet Test Facility (VMTF) Dewar. The mechanical support structure for the test coils will also simulate the geometry of the solenoids in the real magnet. A magnetic measurement system will be developed to characterize the model magnet, validate the fields, and monitor field stability during current excitation. Cooling Experiment: An important part of the future MCTF program is to perform an experimental test of the HCC theory, technology, and simulations. This will require developing and bench-testing HCC components, integrating them into a short test channel, and measuring the response of a muon beam to the channel. The test channel could be a prototype cooling section which includes all the components needed in real

Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE, 2012

Gas Electron Multipliers (GEM) are an interesting technology under consideration for the future upgrade of the forward region of the CMS muon system, specifically in the 1.6 < |η| < 2.4 endcap region. With a sufficiently fine segmentation GEMs can provide precision tracking as well as fast trigger information. The main objective is to contribute to the improvement of the CMS muon trigger. The construction of large-area GEM detectors is challenging both from the technological and production aspects. In view of the CMS upgrade we have designed and built the largest full-size Triple-GEM muon detector, which is able to meet the stringent requirements given the hostile environment at the high-luminosity LHC. Measurements were performed during several test beam campaigns at the CERN SPS in 2010 and 2011. The main issues under study are efficiency, spatial resolution and timing performance with different interelectrode gap configurations and gas mixtures. In this paper results of the performance of the prototypes at the beam tests will be discussed. I. INTRODUCTION T he GEM collaboration (GEMs for CMS) is developing a new prototype detector in view of the CMS high-η upgrade[1]. The CMS[2] endcap region 1.6 < |η| < 2.4 is not instrumented with the Resistive Plate Chambers[3] (RPC) originally planned for this region. Gas Electron Multipliers[4]

Journal of Physics: Conference Series, 2018

We report the beamline design of the Experimental Muon Source (EMuS) project in China. Based on the 1.6 GeV/100 kW proton accelerator at the Chinese Spallation Neutron Source (CSNS), EMuS will extract one bunch from every 10 double-bunch proton pulses to hit a stand-alone target sitting in a superconducting solenoid, and the secondary muons/pions are guided to the experimental area. The beamline is designed to provide both a surface muon beam and a decay muon beam, so that various experiments such as muSR applications and particle/nuclear physics experiments can be conducted. In this work we present the conceptual design and simulation of the beamlines, and discuss the future aspects of the project.

Nuclear Science and Techniques/Nuclear science and techniques, 2024

A new muon beam facility, called the Experimental Muon Source (EMuS), was proposed for construction at the China Spallation Neutron Source (CSNS). The design of the complex muon beamlines for the EMuS baseline scheme, which is based on superconducting solenoids, superferric dipoles and room-temperature magnets, is presented herein. Various muon beams, including surface muons, decay muons and low energy muons, have been developed for multipurpose applications. The optics design and simulation results of the trunk beamline and branch beamlines are presented. With a proton beam power of 25 kW at a standalone target station that consists of a conical graphite target and high-field superconducting solenoids, the muon beam intensity in the trunk beamline varies from 10 7 /s for surface muons to 10 10 /s for high-momentum decay muons. And at the endstations, these values vary from 10 5 /s for surface muons to 10 8 /s for decay muons.