ABP – Hadron Sources & Linacs

R ScrivensABP Group Meeting 19/06/2013

Personnel

Staff Fellows,Students,Visitors

Patrik Andersson Veliko Dimov

Giulia Bellodi Hugo Estevao Pereira

Sebastien Bertolo Jaime Gil Flores

Detlef Kuchler Everton Granneman

Jean-Baptiste Lallement Stefano Mattei

Alessandra Lombardi Robert Mertzig

Jacques Lettry Oystein Midttun

Christian Mastrostefano Andrey Shornikov

Michael O’Neil Joshua Stafford-Haworth

Richard Scrivens Cristhian Valerio

Fredrik Wenander Masoomeh Yarmohammadi

Linac4 Linac2/3

REX

REX ISOLDE

• Excellent performance, with 15 new isotopes delivered including the lightest so far – 6He – and polarized 8Li.

• Pear shaped nucleus discovered.

• Study underway for an EBIS charge breeder with a higher electron current and voltage. Includes tests on a BNL high current gun design in Brookhaven.

L. P. Gaffney, P. A. Butler, M. Scheck, A. B. Hayes, F. Wenander, et al, Nature.

REX ISOLDE - future

• Repair work and some tests for different EBIS cathodes.

• HIE-ISOLDE is under construction, meaning no beam to “REX” until 2015!

• TSR – Study is being made to bring this Heidelberg Storage ring to CERN (to be installed after HIE-ISOLDE).

Linac4 - source• New source and extraction system was installed at the 3MeV

test-stand.

• Once recoupled to the DESY designed plasma generator, H- could be extracted at 45keV for the first time.

• So new extraction system and pulsed HT shown to work even for very high electron currents.

Linac4 - source

• Cesiation of the new source to be commissioned at the test stand.

• Second source to be made operational in the Linac4 tunnel.

Linac4 – Beam Commissioning• Beam though the RFQ on 13/03/2013.

• Validation of RFQ, diagnostics and chopping.

150.0 200.0 250.0 300.0 350.0 400.0 450.0 500.0 550.00

102030405060708090

P=5E-7 mbar

P=1E-6 mbar

P=3E-6 mbar

simulation

RF power in the RFQ (kW)Tran

smiss

ion

thro

ugh

the

RFQ

(%) TRANSMISSION vs RFQ RF POWER

First beam through the RFQ: 10mA H- accelerated at first shot

3 MeV beam slit-SEMgrid emittance measurement

Beam chopper tests

Beam deflection on wire-scanner

Chopped beam

Linac4 – Beam Commissioning• Drift Tube Linac Permenant Quadrupoles up to 25 T/m

– All now delivered to CERN.

• Moveable test bench for beam measurements at 50 and 100 MeV has been defined. Includes emittance measurement with multiple profiles.

Linac4 – Overall Planning

Linac2+3• Linac2 worked like a Swiss Watch.

• Both Linacs serving p->Pb LHC run, L3 for Pb NA61.

• Linac3 startup was very difficult, a lot of controls renovation lessons learned.

• Linac3 has been tested with argon, NAr~6e9 / pulse ~ 10xNPb.

• A lot of information e.g. neutrons produced in Linac3, Ar plasma aggressive in the source.

Linac2+3• Both Linacs now in LS1. Restart planning to be done.

• Linac2

• New access system.

• A lot of critical controls being renovated.

• Instrumentation being changed for Linac4 versions.

• New source controls to be implemented.

• Restart of source in April 2014.

• Linac3

• New stripper.

• Low energy emittance measurement.

• Restart beam in 2014 for a long Ar injector setup and physics run (into 2015).

• Its been a good year, and the last 6 months in particular have seen a lot of highlights -> thanks to great spirit and determination.

• The low energy machines have produced new beams and new physics, and there are plenty of facilities to create.

• Ion for BioLEIR

• H- / p+ source for ELENA