Accelerator & Engineering

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This section of the HKS-HES Wiki contains an overview of the scope of work being performed by Accelerator and Engineering staff in support of the experiment. The section is divided into system-specific sub-sections.

Beam Requirements

In addition to the requirements in the table below the experimenters have requested that a PID lock be used to stabilize the beam position and angle at the target. HKS beam reqs.jpg

Beamline Design

The HKS experiment utilizes a strong dipole field at the location of the target. This requires the use of a chicane to accommodate the large bending angle and safely bring the electron beam to the high power beam dump. The image below shows the general layout of the beamline within the experimental hall.

Chicane beamline design showing three regions.

The layout is separated into three regions. The first region begins at the entrance of the hall and ends at the entrance of the chicane diagnostics girder.

Region 1

The second region begins at the start of the chicane diagnostics girder and ends at the entrance to the Splitter magnet.

Region 2

The third region starts at the entrance of the Splitter and ends at the entrance to the beam dump tunnel.

Region 3

Radiation Budget

The Radiation Control Group has provided an estimate of the contribution to the annual site boundary dose for all of the proposed target configurations.

Region 1



Exit beam shielding for the HKS experiment (Jay Benesch) Media:HKS_seven_mag_results.pdf

Power Supplies


Machine Protection System


Installation Schedule

Water Systems

Photon Beam Dump

Beam Setup Procedures

The MCC Operations Group is responsible for developing and maintaining the beam setup and delivery procedures. This effort is being coordinated by the Operations Hall C Liaison, Mike Aiken. Presently there are three procedures under development:

  • Beamline Commissioning Procedure - this document will contain the detailed description for characterizing the new beam transport system for the first time after installation. It will cover such things as optimization of set points along the main beamline, beam-based fiducialization of diagnostics, optimization of angle and position at the target and compensation of stray spectrometer fields.
  • Beam Delivery Procedure - this document will provide a detailed description for safely providing beam on target meeting the User's requirements.
  • Energy Scan Procedure - the User has request for an energy calibration of their detector systems. The requirement is up to 2% above the nominal 2344 MeV in as many steps as can be accomodated in a reasonable time. This number is to be determined.