The SPS has been taking ions this week, with the aim to re-commissioning injection, capture and acceleration (without slip-stacking).

During this period LEIR has been able to consistently supply more than the LIU target intensity. The plot shows the ejected intensity in terms of the x10^10 charges on 08/11/2021. The green line shows the LIU target intensity,



LEIR has reached the LIU project intensity after the work of the Long Shutdown 2.

Plot shows the ejected intensity in terms of the x10^10 charges. The green line shows the LIU intensity, which we see being exceeded for some shots. Work continues to make all the shots above this target.



Latest refill of Pb at the source has finished after 60 days of operation. Previously, the source was refilled with Pb every 14 days, but thanks to modifications of the few cm long crucible, the oven no longer suffers from a build up of Pb oxide and now can run much longer. More runs are needed before a safe refilling schedule can be decided.


The LIU project officially finished, with the beam about to be sent from Linac3 to LEIR.

A big thank you to all those that contributed to the project, from the source to the exit of LEIR, including new equipment, upgrades and

Linac3 has been able to produce regularly 32uA of Pb54+, and a successful commissioning of LEIR is anticipated.


After the end of year stop, Linac3 is starting up again for testing. First on the list is a source plasma chamber coated with aluminium.


And now the full end of Run2, with the ion source stopped.



LHC Ion run ends for 2018, and that is the end of Run 2.



Incredible operation of Linac3 and LEIR.

Consistantly more than 30uA from Linac3, and 9E10 charges ejected from LEIR.

(Plots show 7 days of NOMINAL beams, where averaging has been made over 1 minute)




Ion run is in full swing.

Yesterday's fill managed more than 1E13 charges into LHC.



The OP+ABP+RF teams just can't stop improving. On MD cycles, new records are being set.



Ions injected and circulated in the LHC - the 2018 LHC ion run is officially GO!


After a major source fault (extraction solenoid open circuit) the a low intensity beam is tested through the LHC injection lines. Planned to start ions in the LHC tomorrow.


A new record intensity at LEIR extraction - After intensive optimization, 10.35E10 charges have been produced.


LEIR achieves LIU intensity, obtaining 8.8E10 charges at the end of the cycle, now to make this the average.


The ECR source is again producing Pb beams. over the next weeks the source will be used for testing, with a new microwave generator as well and be used for MDs at low energies.


The 2017 xenon run has finished. These ions were delivered to the SPS North Area, and in addition to LHC for 24hours as well as to the CHARM facility in the PS East Area. Congratulations to everyone involved. Now some of the LIU upgrades will be installed in the Year End Technical Stop. The ion chain already begins again with lead ions starting on 26 February 2018, with ECR source testing, before the beam is sent to LEIR on 16 April 2018.


For 2017 the CERN accelerator chain will for the first time provide xenon ions at high energy. The xenon beam (isotope=129) will follow the same acceleration chain as the Pb beam (Linac3, LEIR, PS and SPS) but will only be delivered to the North Area (SHINE) for physics. Even if this ion is not part of the LIU programme, we will take advantage to do machine studies to improve our knowledge of the ion accelerator chain. The xenon beam is already circulating in LEIR since this week. Congratulations to the team!



LEIR ends its 2016 operation, having achieved incredible results - well done to everyone involved.

Next year the objective is xenon, for North Area Physics, and then back to Pb in 2018.

01/12/2016 A few shots of 10E10 charges of Pb54+ were extracted from LEIR. In order to get to this point we had a new (and injection optimised) stripper foil, modulated frequency capture and 300mA electron cooling current, 40uA from Linac3, and the best beam optics set up.

30/06/2016 A new version of the digital low level RF has been installed at LEIR, and a low intensity EARLY type beam was captured and accelerated with it!

27/06/2016 More than 9E10 charges of Pb54+ accelerated in LEIR - a new record.


02/05/2016 Beam delivered from Linac3 to LEIR for the first time in 2016. Over the weekend, Linac3 pulsed with 60% NOMINAL cycles with 13 injections spaced by 100ms.

28/04/2016 After the modifications to the low energy stage of Linac3, the beam intensity of 30uA of Pb54+ is available.


First tests of quadrupoles and steerers with 100ms pulsing in Linac3 and the transfer line to LEIR.

-- RichardScrivens - 2016-04-07

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng 2016-06-27-9E10ChargesExtractedLEIR2.png r1 manage 188.8 K 2016-07-06 - 08:16 RichardScrivens  
PNGpng 2016-07-01-9E10ChargesExtractedLEIR.png r1 manage 25.3 K 2016-07-06 - 08:14 RichardScrivens  
PNGpng Ions_End_Run2.png r1 manage 28.0 K 2018-12-10 - 08:15 RichardScrivens  
PNGpng LEIR-10.5E10.png r1 manage 24.7 K 2018-11-07 - 15:53 RichardScrivens  
PNGpng LEIR_2021-08-30_LIU.png r2 r1 manage 28.3 K 2021-10-11 - 15:23 RichardScrivens  
PNGpng LEIR_2021-10-08_LIU.png r1 manage 31.4 K 2021-10-11 - 15:29 RichardScrivens  
PNGpng LEIR_BCTDC_Ejection.png r1 manage 35.2 K 2018-11-18 - 14:28 RichardScrivens  
PNGpng LHC_Ions_End_Run2.png r1 manage 29.8 K 2018-12-03 - 08:43 RichardScrivens  
PNGpng LN3_BCT41_Averaged.png r1 manage 33.3 K 2018-11-18 - 14:28 RichardScrivens  
PNGpng leir-Xe-StartUp-2017.png r1 manage 16.0 K 2017-05-13 - 09:49 RichardScrivens  
PNGpng lhc3.png r1 manage 34.7 K 2018-11-13 - 14:18 RichardScrivens  
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Topic revision: r15 - 2021-10-11 - RichardScrivens
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