1. LIU and TE/VSC activities LIU-SPS aC coating & flange impedance reduction Paul Cruikshank
LIU & TE/VSC activities, 23/6/2016
Paul Cruikshank

2. LIU-SPS: a-C coating & impedance reduction
Preparing SPS for HL-LHC beams
Reduce longitudinal impedance
by adding shielding at
chamber interconnections
Reduce SEY with a-C where
scrubbing may not be sufficient
MBB
MBA
SSS QD QF
a-C +
Imp’d
Drift
64 m arc cell
Recommendations of LIU-SPS Scrubbing Review 8-9 September 2015
LIU & TE/VSC activities, 23/6/2016
Paul Cruikshank

3. SPS beam pipes to be a-C coated.
Dipoles
Quadrupoles
SSS & drifts
QF type
QD type
Includes:
Ø80, Ø159, QF, MBA
profiles
In-situ a-C, 6.5 meter x 2

4. Flange impedance reduction (QF SSS only)
Existing flange impedance reduction
(pumping port & 10 convolution bellows)
SSS flange impedance reduction
(4 convolution bellows)
LIU & TE/VSC activities, 23/6/2016
Paul Cruikshank

5. QF sequence - aC & IR Mandate: EYETS – up to 1 ARC
LS2 – complete 6 arcs
Prevessin site
(magnet lift)
(LS2)
8 QF (YETS 2017)
9 QF (EYETS 2016)
BA3
(magnet lift) RF
BA2
BA4
TT20 ext
TT40 ext
Injection
& Dump
Future
dump
BA1
BA5
TT60 ext
ECX5
BHA5
BA6
Meyrin, P1 LHC
(magnet lift)
QF activity includes QF & SSS QF treatment (aC & IR)
LIU & TE/VSC activities, 23/6/2016
Paul Cruikshank

6. MBB work sequence Mandate: EYETS – aC in-situ learning
LS2 – 1 sextant to industrialise
LS3 – all SPS if required
Prevessin site
(magnet lift)
(LS3)
2 cells (EYETS 2016)
0.5 to 1 arc (LS2)
1 cell (YETS 2017)
BA3
(magnet lift) RF
BA2
BA4
TT20 ext
TT40 ext
Injection
& Dump
Future
dump
2 cells - done
BA1
BA5
TT60 ext
ECX5
BHA5
BA6
Meyrin, P1 LHC
(magnet lift)
MBB aC activity includes QD & SSS QD treatment (aC & IR)
LIU & TE/VSC activities, 23/6/2016
Paul Cruikshank

7. Remainder drift (YETS 2017)
LSS drift Ø159 - aC
Mandate:
EYETS – 10% of inventory
LS2 – complete 6 LSS
Prevessin site
(magnet lift)
(LS2)
BA3
(magnet lift) RF
Remainder drift (YETS 2017)
BA2
BA4
10% drift (EYETS 2016)
TT20 ext
TT40 ext
LS2 Drift Chamber Sequence:
BA1 – new layout, % new chambers < LS2
BA2 – activated, new chambers < LS2
BA3 – new layout, % new chambers < LS2
BA4 – done in EYETS & YETS
BA5 – new layout, % new chambers < LS2
BA6 – coat existing chambers
Injection
& Dump
Future
dump
BA1
BA5
TT60 ext
ECX5
BHA5
BA6
Next steps:
Study each BA layout for new chamber needs
What % drift new layout, % drift existing.
What ‘impedance reductions’ to implement
Create aC to do list – before LS2, during LS2.
Meyrin, P1 LHC
(magnet lift)
LIU & TE/VSC activities, 23/6/2016
Paul Cruikshank

8. Does TE/VSC have all needed information from LIU
Scrubbing review – agreed scope, timeline and budget of the aC coating (and flange impedance reduction)
Documentation
LSA – done
List of hazards – approval process to start
Safety File Descriptive Part 1 – approval process to start
Functional spec for impedance reduction – engineering check
Functional spec for aC coating – approval process to start
ECR (for EYETS) in preparation
LIU & TE/VSC activities, 23/6/2016
Paul Cruikshank

9. Are TE/VSC preparatory activities within expected timeline?
aC coating for EYETS
Validation of 13 m MBB string in 181
Validation of QF profile coating in 181
Setting up of long test station in 867 (MBB, QF, SSS girder) – trials and training
Job open for manufacturing of replacement drift chambers.
Procurement of components for benches (tunnel & 867)
Setup of benches in 867 vacuum lab to do
Flange Impedance Reduction for EYETS.
Shielding design finalised for EYETS implementation
Based on design applied during 1999 impedance reduction
Cannot wait for RF measurements/simulations on flexible fingers
Cannot wait for soft clamp tests (by-pass of insulated flanges)
Detailed design and manufacturing will be tight
Planning for EYETS
All tunnel activities in same arc
Takes account of learning objectives - time margin for surprises
VSC activities are staff dominated
Methodologies will be confirmed – eg SSS girder/individual magnet handling
Drift chambers manufactured and coated in advance of EYETS
Detailed planning to be elaborated with EN-ACE-OSS
LIU & TE/VSC activities, 23/6/2016
Paul Cruikshank

10. Has all the LIU required work been declared in PLAN
Has all the LIU required work been declared in PLAN? (Are all dependencies on other groups defined…?)
Dependencies on other groups identified during costing exercises for aC & flange impedance reduction in 2015.
Weekly deployment meeting with representatives of involved group TE-MSC, EN-ACE-SU, EN-HE, TE-VSC, BE-RF, EN-ACE-OSS, HSE-RP,
Data entered in PLAN (EYETS, LS2)
LIU & TE/VSC activities, 23/6/2016
Paul Cruikshank

11. Are the LIU EVM timeline & budget correct?
Annual work units based on APT data (agreed budget)
Need to establish EVM data to reflect deliverables
LIU & TE/VSC activities, 23/6/2016
Paul Cruikshank

12. Are the VSC-CONS items linked to the operation of LIU approved, in time and within specification?
All TE-VSC SPS Cons requests up to 2020 have been approved
Ion pumps, ion pump power supplies, spare chambers, flanges, bellows, valves, pumping group renovation, …
On-going clarification of SPS controls consolidation (PLC replacements) request. Postponed during 2015 CONS arbitration exercise but now understood to be within ‘CONS envelope’ attached to HL-LHC during C&S.
LIU & TE/VSC activities, 23/6/2016
Paul Cruikshank

13. Thanks for your attention
LIU & TE/VSC activities, 23/6/2016
Paul Cruikshank