LESS project updates
2nd Project Management Board Meeting
M. Sitko
2/02/2017
LESS Project Updates
1
LESS procurement
Components
Company
Ordered
Delivered
Transferred
to UK
YES
YES
YES
Lenses and
supports
Thorlabs
Mirrors
Layertec
YES
YES
YES
Supports and
mounting
elements
Newport (MicroControle)
YES
YES
YES
Displacement
sensor
Micro-Epsilon
YES
YES
YES
Stages
Aerotech
YES
YES
YES
Laser
Coherent
YES
NO (9 FEB)
NO
Optical fibre
GLOphotonics
YES
NO (13 MAR)
NO
2/02/2017
LESS Project Updates
2
Visit in Dundee
• The laser bench for segmented COLDEX
beam screen is working
• Instructions on cleaning of the laser
bench and handling the COLDEX
segmented tubes has been given
• Treatment is done in nitrogen (laminar flow)
2/02/2017
LESS Project Updates
3
First results
• First treatment trials of the
dummy sample were tested
E. Garcia-Tabares Valdivieso
2/02/2017
LESS Project Updates
4
COLDEX treatment progress
1x
+
8x
Courtesy R. Salemme
TBD
#8
OK
#7
NOK
#2
OK
#3
NOK
#1
OK
#5
NOK
#6
OK
@CERN
@CERN
@CERN
@CERN
@CERN
#4
OK
@CERN
Welding direction
2/02/2017
LESS Project Updates
5
COLDEX treatment progress
Tube #3: bright spots observed of unknown origin
Tube #5: surface scratches created due to nitrogen tube
touching the surface
Tube #7: problems with autofocusing
#3
#3
2/02/2017
#5
LESS Project Updates
6
Functional specifications
No changes with respect to the version presented in Paris.
 SEY<1 for primary electron energy below 1 keV
 No dust particles larger than 25 µm, influence of multiple smaller
particles to be studied
 Outgassing rate: increase of a factor 100 after 10h of pumping is
considered acceptable
 Impedance: a factor ~2 increase is considered acceptable
 Exposure to radiation damage over the 15 year lifetime of the HLLHC
 Properties of LESS surface shall not be changed by mechanical
loads induced by magnet quenches
Documents in EDMS:
#1747550: Requirements for Laser Engineered Surface Structures (LESS) Treatment of
Inner Triplet and D1 Vacuum Chambers in IR2 and IR8.
#1752638: Requirements for Laser Engineered Surface Structures (LESS) Treatment of
COLDEX Beam Screen.
2/02/2017
LESS Project Updates
7
Summary
1. Procurement for the laser bench is finished.
2. Segmented COLDEX beam screen treatment is going
well.
3. First results obtained from the dummy sample are very
promising.
4. COLDEX installation previewed in March.
5. No changes in functional specifications BUT the test
campaign should be planned to study LESS properties
(outgassing, impedance, dust, irradiation, mechanical)
and to choose optimal laser parameters.
2/02/2017
LESS Project Updates
8