US LHC Accelerator Research Program (LARP)

US LHC Accelerator Research Program (LARP)Eric Prebys, FermilabProgram Director, LARP

First Joint HiLumi/LARP meeting

November 16, 2011

http://www.uslarp.org/


Outline Overview of LARP

Technical details in following talks LARP Personnel Programs LARP and HiLumi The future

November 16, 2011Eric Prebys - Joint LARP/HiLumi Meeting 2


LARP The US LHC Accelerator Research Program (LARP)

was formed in 2003 to coordinate US R&D related to the LHC accelerator and injector chain at Fermilab, Brookhaven, and Berkeley SLAC joined shortly thereafter Has also had some involvement with Jefferson Lab/Old

Dominion University and UT Austin LARP has contributed to the initial operation of the

LHC, but much of the program is focused on future upgrades.

The program is currently funded at a level of about $12-13M/year, divided among. Accelerator research Magnet research (~half of program) Programmatic activities, including support for personnel at

CERNNovember 16, 2011 3Eric Prebys - Joint LARP/HiLumi Meeting


LARP Subprograms Accelerator Systems (talk by Tom Markiewicz)

Instrumentation Collimation Accelerator Physics Crab Cavities etc

Magnet Systems (talk by GianLuca Sabbi) ~half the program in terms of resources Long term program to establish the viability of Nb3Sn

superconductor for large aperture/high gradient quadrupoles proposed for LHC upgrades.

Programmatic Activities Management costs Travel Support for US personnel working at CERN



General Comments About Subprograms The Magnet Systems portion of LARP is a

monolithic program, with a well-defined goal. LARP resources insufficient to build an actual “prototype” Hand off to production project ~2015 That money (or some of it) will disappear from LARP budget

Accelerator Systems works to match US interests and expertise to perceived needs at the LHC Generally a faster time scale Activities change significantly over time Expected to be ongoing

Personnel programs respond to immediate needs of LHC commissioning and optimization. Very valuable Would be the “last thing to go”



LARP Contributions to Initial LHC Operation Schottky detector

Used for non-perturbative tune measurements (+chromaticities, momentum spread and transverse emmitances) – Operational

Tune tracking Implement a PLL with pick-ups and quads to lock LHC tune – Fully

integrated Investigating generalization to chromaticity tracking

AC dipole US AC dipole to drive beam Measure both linear and non-linear beam optics – Primary tool for high

energy optics Luminosity monitor

High radiation ionization detector integrated with the LHC neutral beam absorber (TAN) at IP 1 and 5. – Primary fast system (VDM scans, etc)

Synchrotron Light Monitor Used to passively measure transverse beam size and monitor abort gap Not a LARP project, but significantly improved by LARP – Fully

integrated Low level RF tools

Leverage SLAC expertise for in situ characterization of RF cavities – Fully integrated

Personnel Programs…November 16, 2011 6Eric Prebys - Joint LARP/HiLumi Meeting


Toohig Fellowship Named for Tim Toohig, one of the founders of

Fermilab Open to recent PhD’s in accelerator science or HEP. Successful candidates divide their time between

CERN and one of the four host labs. Past

Helene Felice, LBNL, now post-doc Rama Calaga, BNL, now staff and LTV Ricardo DiMaria, BNL, now CERN Fellow Ryoichi Miyamoto, FNAL, now ESS (Lund) Dariusz Bocian, FNAL, now Poland

Present Valentina Prevatali, FNAL John Cesaratto, SLAC

If interested, contact John Fox at SLACNovember 16, 2011 7Eric Prebys - Joint LARP/HiLumi Meeting


Long Term Visitors Program Based on positive experience of early “ad hoc” visitors

Peter Limon, Jim Kerby, Bob Flora, Sandor Feher, etc LARP Pays transportation and living expenses for US

scientists working at CERN for extended periods (at least 4 months)

Extremely successful at integrating people into CERN operations Past:

Jim Strait, FNAL – Machine protection/splice consilidation Steve Peggs , BNL – UA9 Alan Fisher, SLAC – Synchrotron Light Monitor Eliana Gianfelice, FNAL – abort gap cleaning Uli Wienands, SLAC – UA9, PS2, PSB Rama Calaga, BNL – crab cavities and commissioning (now

CERN staff) Present:

Chandra Bhat, FNAL – flat bunches for Large Pewinski Angle solution

Alexexey Burov, FNAL – instabilities Success owes a lot to strong support from CERN! Interested parties coordinate with a CERN sponsor and apply

to the program (Uli Wienands, SLAC)

November 16, 2011 8Eric Prebys - Joint LARP/HiLumi Meeting


Impact of LARP Personnel Programs


Letter to Michael Procario, Acting Head, DOE Office of High Energy Physics, 9-MARCH-2011


Relevance of LARP to CERN Upgrade*


(…)

Letter to Dennis Kovar, Head, DOE Office of High Energy Physics, 17-August-2010

*letter suggested at review


Memo from Lucio Rossi


Memo to DOE - Office of High Energy Physics

From HL-LHC project and US leaders of various labs.

May 30, 2011

Activities for upgrading LHC performance have been recently organized at CERN in the High Luminosity LHC project, HL-LHCi. This project is the natural interface for all studies carried out in the United States on the LHC upgrade, both inside LARP or within the various basic programs in each of the laboratories. The upgrade studies for the LHC are complemented by a similar project structure for the LHC Injector complex Upgrade (LIU).

(…) There is a general consensus on the fact that the main equipment/systems that US laboratories could provide for the HL-LHC project are:

1. Superconducting magnets for the high luminosity Interaction Regions, namely the low triplets and/or the dipole separators; the system may be completed with the TAS-TAN and other important equipment, similar to what was done for the special US contribution for the LHC project;

2. Superconducting crab cavities to be installed in the Long Straight Sections of the two high luminosity insertions; possibly this may include also the powering and control equipment that make the complete RF system;

3. Equipment for the collimation system capable to deal with new level of luminosity and beam intensity:

a. Different types of collimators that are capable of operating at room temperature or at cryogenic temperature.

b. 11 tesla – 11 meter long superconducting dipole to replace LHC main dipoles and make room for collimator in the LHC arc (cold zone).

This list is not exhaustive; other items (like special wires for long range beam-beam compensation, a high bandwidth transverse feedback system for the SPS, special beam diagnostics, etc…) may be added.

(…) i See document of the CERN Director for Accelerators & TechnologyDG-DAT-2010-005 (Rev) of 15 December 2010

LARP

non-LARP


LARP and HiLumi Because of the acknowledged relevance of

LARP work to the long term goals of CERN wrt the LHC, it makes sense to coordinate with the HiLumi design study (and whatever follows)

HiLumi Work Packages:WP1: ManagementWP2: Beam Physics and LayoutWP3: Magnet DesignWP4: Crab Cavity DesignWP5: Collimation and Beam LossesWP6: Machine ProtectionWP7: Machine/Experiment InterfaceWP8: Environment & SafetyNovember 16, 2011Eric Prebys - Joint LARP/HiLumi Meeting 12

Significant LARP and other US Involvement

LARP will be involved if crystal or e-beam included


Letter in support of HiLumi-LHC Design Study



Major Ongoing LARP Accelerator Activities Rotatable Collimators – SLAC LLRF – SLAC High Bandwidth Feedback for SPS – SLAC, LBL Crystal Collimation

UA9 at CERN – SLAC, FNAL T980 at FNAL – FNAL

General beam physics and beam-beam – FNAL, SLAC, LBNL

Hollow electron beam collimation – FNAL Crab cavities – FNAL, SLAC, LBNL, BNL, JLAB/ODU Energy deposition studies in magnets – FNAL, LBNL



Scope and Limits of LARP The “R” in LARP is for “Research”

LARP is an R&D organization ~Fixed budget scope and schedule contingency Not really set up for major hard deliverables

Lumi monitor, although ultimately very successful, was a cautionary tale

Model: Promising LARP R&D will be used to motivate separately funded and monitored projects Primary candidates:

Final focus triplets Crab Cavities

Other possibilities SPS feedback? Hollow electron beam collimation?



Long Term Crab Cavity Strategy LARP plans to continue to support crab cavities at

the ~$600k/year level. This is enough to complete a conceptual design. Perhaps construct a prototype cavity and test in a

cryostat. Longer term plan:

Spawn off a construction project to take on some large portion of the overall crab effort Full prototype with cryomodule? Build some fraction of the final cavities

4 stations per IR for full local scheme Exact US role an important discussion for HiLumi (and US

DOE)



Magnet Strategy In 2009, LARP successfully demonstrated its “LQ”

magnet 3.7m x 90mm aperture Original “goal” of LARP program!

Currently testing “HQ” 1m x 120mm aperture Known problems being addressed

Final “LARP” magnet will be LHQ 3.7m x 120 aperture Other aspects of “accelerator quality” magnet

Alignment, field quality, etc Effort will then transition to a “project” to design,

prototype, and build magnets for HiLumi upgrade Fully integrated into HiLumi plan Assumption is that US will build (although no one has

promised this yet!) November 16, 2011Eric Prebys - Joint LARP/HiLumi Meeting 17


US LHC Accelerator Research Program (LARP)

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