ColUSM Website

Hollow electron lens for HL-LHC beam collimation

Updates and News

Hollow e-lensesare now part of the HL-HEL WP5 upgrade baseline!
Recent design updatesnew gun design (PPTX) (30-01-2020).

Relevant references to publiches notes/articles

Conceptual design report 2014 (FERMILAB-TM-2572-APC, CERN-ACC-2014-0248): link, PDF.
IPAC2015 "Plans for deployment of hollow e-lenses at the LHC": JaCoW link, paper PDF, talk PDF.
Collimation session at the recent US-LARP/HiLumi meeting, Napa, CA, USA, April 2017: indico link to CM28, (complete event here).
Overview of beam test results at the Tevatron: PDF, link to ARXIV.

Presentations and recent material (in support for upcuming review of Oct. 2017

S. Redaelli	Introduction and motivation, as presented at 2016 review pdf [Note: using a design of 1year ago, now obsolete] Draft technical specifications for the HL-LHC lenses (PDF)
D. Perini	Present design of the HL-LHC hollow e-lenses for collimation: design on a PPTX, JPEG, draft ATS note (DOCX)
P. Fessia, M. Amparo	Status of integration in the HL-LHC point 4 [PRELIMINARY draft of review slides] PDF, PPTX

External and internal project reviews on HEL for collimation

2017 review on "E-lens concept readiness for integration in the HL-LHC baseline" [under preparation]: indico link; abstract list (DOCX, PDF).
2016 review on needs for halo depletion at the HL-LHC: indico link, mandate and composition (PDF), review summary (PDF).
2012 review on "Possible usage of Tevatron e-lenses at CERN", indico link to special ColUSM.

Some pictures of the present hollow e-lends design

Some highlight results

Record electron beam current of 5.4A at Fermilab with the CERN hollow gun (Jan. 2017):