LANSCE High Density Emittance
Instrumentation System*L. Montoya†, S. Baily, S. Johnson, H. Leffler, H.A. Watkins, D. Zimmermann - Los Alamos National Laboratory, Los Alamos, NM 87545, USAAbstract

The Los Alamos Neutron Science Center (LANSCE) is currently upgrading theexisting emittance stations with a high-density instrumentation system foremittance measurements in the low energy beam transport region. Emittancemeasurements were obtained using obsolete legacy equipment. For motion
control a switching station with a mechanical mux to switch actuators wasused. This caused a single point of failure for all emittance stations and isbecoming increasingly unreliable. For data acquisition, two sets of signal
conditioning and digitizers were employed and had to be shared between 7emittance stations. Physical cable swapping was necessary when taking
measurements from station to station. A system was developed using
dedicated Quad Actuator Controller (QAC) chassis, capable of driving four (4)actuators, and dedicated data acquisition (DAQ) chassis capable of signal
conditioning and digitizing up to 80 channels simultaneously. Details of thesystem development are presented.

System Location and Overview

Locations upgraded during the 2023 outage are shown in green, and planned
upgrades to be completed during the 2024 outage are shown in yellow.
Emittance measurements provide necessary information to tune the beam byproviding beam parameters such as beam position, shape, angle, and intensity
in both transverse and longitudinal planes through the beam pulse.

Emittance Location Map

Controller Hardware

Using recently developed Quad Actuator Controllers (QAC) and Data Acquisition(DAQ) instrumentation chassis, the existing system is to be completely replacedand condensed with increased density of electronics. The hardware diagram ofthe emittance system is shown. QAC chassis will provide actuator control for asingle emittance station, driving vertical and horizontal slits and collectors. TheDAQ maintains acquisition capabilities as developed. Live waveform data canbe observed where a collector can effectively be utilized as a harp device.

Results

DAQ Emittance WaveformEmittance Hardware Block Diagram* This work was supported by the U.S. Department of Energy through the Los Alamos
National Laboratory. Los Alamos National Laboratory is operated by Triad National
Security, LLC, for the National Nuclear Security Administration of U.S. Department ofEnergy (Contract No. 89233218CNA000001). † lucasm@lanl.gov

Managed by Triad National Security, LLC, for the U.S. Department of Energy’s NNSA.

IBEM01 Horizontal Emittance Scan

LA-UR-23-30154

Emittance measurements
were taken using chopped
and un-chopped beam in
the LEBT using both H+and H- beams. IBEM01
horizontal emittance scanon the cRIO system withsimilarmeasurements
being
producedfrom
previous years confirming
the viability of the system
and allowing for a total
replacement of all legacyhardware.
Successful commissioningof the emittance stations
has prompted work to beplanned to complete theremaining
emittance
stations and upgrade harp
devices using the QAC andDAQ platform. With all
LANSCE beam interceptive
devices on the same
platform, diagnostics will
become easier to maintainwith fewer hardware types
to learn and have spares
more readily available.