LANSCE DIGITAL LOW LEVEL RF UPGRADE P. Van Rooy M. Prokop S. Kwon P. Torrez L. Castellano A. Archuleta C. Marchwinski AOT -Division Los Alamos National Laboratory Los Alamos New Mexico USA

2025-04-27 0 0 392.73KB 5 页 10玖币

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LANSCE DIGITAL LOW LEVEL RF UPGRADE*

P. Van Rooy†, M. Prokop, S. Kwon, P. Torrez, L. Castellano, A. Archuleta, C. Marchwinski

AOT-Division, Los Alamos National Laboratory, Los Alamos, New Mexico, USA

Abstract

Incremental upgrades of the legacy low level RF (LLRF)

equipment—50 years for the Los Alamos Neutron Science

Center (LANSCE)—involves challenges and problems not

seen with new and total replacement opportunities. The

digital LLRF upgrade at LANSCE has deployed 30 of the

53 required systems as of September 2022. This paper de-

scribes the performance of the digital upgrade, current sta-

tus, and future installations along with the technical chal-

lenges, including unexpected challenges, associated with

deploying new digital systems in conjunction with legacy

analog equipment. In addition, this paper discusses the op-

erational details of simultaneous multi-energy beam oper-

ations using high energy re-bunching, beam-type specific

set points and simultaneous multi-beam operations at

LANSCE. The adaptability of the digital LLRF systems is

essential as the design is able to accommodate new control

and beam parameters associated with future systems with-

out significant hardware modifications such as the ex-

pected LANSCE Modernization Program. This adaptabil-

ity of the digital LLRF technology was recently demon-

strated with the Module 1, 201.25-MHz high-power RF up-

grade completed in 2021.

LANSCE RF SYSTEM

The LANSCE accelerator, an 800 MeV proton accelera-

tor, saw first light in 1972 and has been in use ever since.

The cavity fields were, and in some places still are, con-

trolled by the analog system original to the accelerator. At

LANSCE, the LINAC is composed of one 201.25 MHz

Drift-Tube LINAC (DTL) sector and seven 805 MHz Cou-

pled-Cavity LINAC (CCL) sectors. 805 MHz sectors are

composed of 6~7 CCLs. In contrast, 201.25 MHz sector is

composed 4 DTLs and each DTL has its own high voltage

system.

In 2014, the LLRF team at LANSCE began installing a

LLRF upgrade from the analog systems of the late 1960s

and early 1970s to new digital systems [1, 2]. The analog

system is becoming more difficult to maintain with in-

creasingly obsolete parts making repairs and maintenance

very challenging, a lack of flexibility and the need for an

upgraded system as part of an overall LANSCE upgrade. It

should be noted that the original analog system was incred-

ibly robust and has been working reliably since 1972.

Currently, 30 of the 53 systems digital LLRF systems

have been upgraded and all digital LLRF systems are

scheduled to be updated by the end of 2024. As of October

2022, all 201.25 MHz RF systems have been updated and

26 of the 44 805 MHz RF systems have been updated.

There are still updates to come for the remaining 805 MHz

RF systems, the Low Energy Buncher Transport (LEBT),

and the Proton Storage Ring (PSR).

DIGITAL LOW LEVEL RF UPGRADE

The System

The new digital LLRF system has more sophisticated

control systems, digital processing, and a greatly increased

adaptability. The LLRF data is now available over the Ex-

perimental Physics and Industrial Control System (EP-

ICS), has a digital I/Q controller, and the flexibility of the

system is increased [2, 3].

A Fully Adaptive Feed Forward Iterative Learning Con-

troller has beam implemented for several beam types. The

long term robustness of this system and an auto start-up

system of the digital LLRF systems are currently under

test. Currently in use for the module one 2012.25 MHz sys-

tems is a disturbance observer controller.

Deployment of digital Low Level RF Systems

and integration with existing legacy equipment

The first digital LLRF systems were deployed in con-

junction with new high-power (3 MW) 201.25 MHz tube

amplifiers in the spring of 2014. Due to integration and

control network issues, the deployment was delayed for a

year and the first systems were operational in 2015. The

final deployment of the remaining 201.25 MHz system

happened in spring of 2016. The integration and commis-

sioning with the new tube amplifiers was simplified be-

cause both systems were designed with the other in mind.

____________________________________________

*Work supported by the United States Department of Energy, Na

tional Nu-

clear Security Agency, under contract 89233218CNA000001.

†pvanrooy@lanl.gov

Figure 1: Analog LLRF Rack

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LANSCEDIGITALLOWLEVELRFUPGRADE*P.VanRooy†,M.Prokop,S.Kwon,P.Torrez,L.Castellano,A.Archuleta,C.MarchwinskiAOT-Division,LosAlamosNationalLaboratory,LosAlamos,NewMexico,USAAbstractIncrementalupgradesofthelegacylowlevelRF(LLRF)equipment—50yearsfortheLosAlamosNeutronScienceCenter(LANSCE)—involveschalleng...

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LANSCE DIGITAL LOW LEVEL RF UPGRADE P. Van Rooy M. Prokop S. Kwon P. Torrez L. Castellano A. Archuleta C. Marchwinski AOT -Division Los Alamos National Laboratory Los Alamos New Mexico USA

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