12th Int. Beam Instrum. Conf.
ISBN: 9 7 8 - 3 - 9 5 4 5 0 - 2 3 6 - 3IBIC2023, Saskatoon, Canada
JACoW Publishing
ISSN: 2 6 7 3 - 5 3 5 0d o i : 1 0 . 1 8 4 2 9 / J A C o W - I B I C 2 0 2 3 - W E P 0 2 8L. Montoya†, S. Baily, S. Johnson, H. Leffler, H. Watkins, D. Zimmermann
Los Alamos National Laboratory, Los Alamos, NM, USAAbstract
The Los Alamos Neutron Science Center (LANSCE) iscurrently upgrading the existing emittance stations with ahigh-density instrumentation system for emittance measurements in the low energy beam transport region. Emittance measurements were obtained using obsolete legacy
equipment. For motion control a switching station with amechanical mux to switch actuators was used. This caused
a single point of failure for all emittance stations and is becoming increasingly unreliable. For data acquisition, twosets of signal conditioning and digitizers were employed
and had to be shared between 7 emittance stations. Physicalcable swapping was necessary when taking measurementsfrom station to station. A system was developed using dedicated Quad Actuator Controller (QAC) chassis, capable ofdriving four (4) actuators, and dedicated data acquisition(DAQ) chassis capable of signal conditioning and digitizing up to 80 channels simultaneously. Details of the systemdevelopment are presented.

INTRODUCTION
Emittance diagnostics have long been operating usingaging instrumentation with limited spares available with
the need to be upgraded with modern electronics to avoid
obsolescence and increase reliability of measurements.
The emittance instrumentation upgrade aims to extend
the lifetime and capability of beam diagnostic equipment
by replacing antiquated systems that are now in obsolescence with modern equipment and to improve operational
efficiency and performance with the ability to automate
previously labor-intensive tasks to initialize measurementson the legacy system. The reliability of the equipment
would be greatly improved as the National Instruments(NI) compact Reconfigurable Input/Output (cRIO) controllers are inherently more robust than the legacy equipment and reduces the amount of potential failure and ismore easily maintained as components in each chassis arereadily available off the shelf.

SYSTEM LOCATION AND OVERVIEW
Locations
There are 11 emittance stations in the H- dome, Low Energy Beam Transport (LEBT), and Transition Region (TR)which corresponds to 44 unique devices associated withthe upgrade. Locations upgraded during the 2023 outage
are shown in green, and planned upgrades to be completed
during the 2024 outage are shown in yellow in Fig. 1.

Figure 1: Emittance location map.

System Overview
Emittance stations are beam interceptive devices, thus
are comprised of actuators in both horizontal and verticalaxes with sensor payloads at the head of each device. Emittance measurements provide necessary information to tune
the beam by providing beam parameters such as beam position, shape, angle, and intensity in both transverse andlongitudinal planes through the beam pulse.

CONTROLLER HARDWARE
Using recently developed Quad Actuator Controllers(QAC) and Data Acquisition (DAQ) instrumentation chassis, the existing system is to be completely replaced andcondensed with increased density of electronics [1]. The
hardware diagram of the emittance system is shown on
Fig. 2.
The QAC chassis will provide actuator control for a single emittance station, driving vertical and horizontal slitsand collectors. In doing so, the legacy actuator switchingstation will be retired, removing it as a single point of failure in the system. Each emittance station was deployed adedicated DAQ chassis removing the need to rely on theSample and Hold chassis and shared digitizers used for all
emittance measurements [2]. Both horizontal and verticalcollectors in the emittance station are wired in parallel suchthat excitation of one axis can be read at a time and allow
for a single 80 channel DAQ to read in 76 sensor inputs
from the collector.

___________________________________________* This work was supported by the U.S. Department of Energy throughthe Los Alamos National Laboratory. Los Alamos National Laboratoryis operated by Triad National Security, LLC, for the National Nuclear
Security Administration of U.S. Department of Energy (Contract No.
89233218CNA000001).
† lucasm@lanl.gov. LA-UR-23-30153

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Content from this work may be used under the terms of the CC-BY-4.0 licence (© 2023). Any distribution of this work must maintain attribution to the author(s), title of the work, publisher, and DOILANSCE HIGH DENSITY EMITTANCE INSTRUMENTATION SYSTEM*

Content from this work may be used under the terms of the CC-BY-4.0 licence (© 2023). Any distribution of this work must maintain attribution to the author(s), title of the work, publisher, and DOI

12th Int. Beam Instrum. Conf.
ISBN: 9 7 8 - 3 - 9 5 4 5 0 - 2 3 6 - 3IBIC2023, Saskatoon, Canada
JACoW Publishing
ISSN: 2 6 7 3 - 5 3 5 0d o i : 1 0 . 1 8 4 2 9 / J A C o W - I B I C 2 0 2 3 - W E P 0 2 8beams. Figure 4 shows IBEM01 horizontal emittance scanon the cRIO system with similar measurements being produced from previous years confirming the viability of thesystem and allowing for a total replacement of all legacy
hardware.

Figure 4: IBEM01 horizontal emittance scan.
Figure 2: Emittance hardware block diagram.
The DAQ maintains acquisition capabilities as developed on the Isotope Production Facility emittance upgrade
project from which it was initially developed [3]. Livewaveform data can be observed as shown in Fig. 3 where acollector can effectively be utilized as a harp device.

CONCLUSION
With a successful commissioning of the emittance stations, work is planned to complete the remaining stations
and upgrade harp devices using the QAC and DAQ platform. With all LANSCE beam interceptive devices on thesame platform, diagnostics will become easier to maintainwith fewer hardware types to learn and have spares more
readily available.

REFERENCES[1] L. Montoya, et al., “LANSCE QAC/DAQ Wire Scanner Instrumentation Upgrade,” presented at IBIC’23, Saskatoon,Canada, Sep. 2023, paper WEP029, this conference.
[2] D. Baros, J. D. Sedillo, and H. A. Watkins, “Bridging the Gap;
Updating LANSCE Digitizers”, in Proc. IBIC'16, Barcelona,Spain, Sep. 2016, pp. 822-824.

Figure 3: DAQ emittance waveform.

BEAM MEASUREMENT RESULTS
Emittance measurements were taken using chopped andun-chopped beam in the LEBT using both H+ and H-

doi:10.18429/JACoW-IBIC2016-WEPG74[3] J. D. Sedillo, D. Baros, J. F. O, L. Rybarcyk, R. A. Valicenti,and H. A. Watkins, “LANSCE Isotope Production Facility
Emittance Measurement System”, in Proc. IBIC'16, Barcelona, Spain, Sep. 2016, pp. 548-550.
doi:10.18429/JACoW-IBIC2016-TUPG79

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03 Transverse Profile and Emittance Monitors