STATUS REPORT: ALIGNMENT OF COLLIMATORSP. BESTMANN /O. ABERLE
Collimation Working Group
26/09/2011
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Overview
Situation today Planned for Winter stop 2011/12 To be done in LS 1: 2013/14 To be done for LS2 Questions and Discussion
26/09/2011CWG
CWG
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Situation today
26/09/2011
Alignment in general: Lower support part is aligned in the tunnel (with a dummy
collimator (1/10 in weight); Every collimator is prepared on surface to reference values
Flange centre is the reference Aligned to the three supporting points Alignment transferred to fiducials on top of the collimator
Phase 1 installed and running since 2 years Checks with beam based alignment procedure
twice a year Three versions:
Ring collimators in IR 3 and 7 (for remote handling and survey)
Ring collimators with “low” dose levels, not remote handling
Transfer line collimators (no plug-in system)
CWG
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Situation today
26/09/2011
In March 2011, some collimators have been identified to need re-alignment.(an angular misalignment >1.9mrad on TCLA.A7R7.B1, TCTH.4L2.B1 and TCSG.A5L3.B2).
Reasons identified as: conflict with adjacent vacuum
chamber Installation protection added on the
support IR extremities, dead end extrapolation
CWG
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Situation today
26/09/2011
IR 3 and IR 7, warm section 8 + 22 TCSM locations prepared:1. Base support installed2. Cables up to the last few meters
ready (No BPM!)3. Rack space reserved, has to be
reorganized4. Vacuum replacement chambers ok
TCSM + TCS slots
CWG
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Situation today
26/09/2011
IR 7 is prepared for TIM manipulation IR 3 will be equipped equally (stretched
wire, additional targets) Re-alignment upon request, two
smoothening campaigns since first installation LHC Smoothing should be followed by
systematic collimator realignment in the future
All installed supports are “pre-aligned” but all installed new collimators need to be checked
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Situation today
26/09/2011EMPTY PHASE II TCSM SLOT (30 IN TOTAL)
PHASE I TCSG SLOT
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Situation today – IR 2
26/09/2011CWG
Current situation 4L2, part of VACSEC A4L2.CInsertion of a TCTVA
Arc 1-2
IP2: ALICE
Collimator area ID800 area
Courtesy Eric Page
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To be done in WS 2011/12
26/09/2011
IR 2 (if ECR is approved) 2 new TCTVA’s (TCLP collimators) Layout change with new
alignment(ca. 40 m on each side)
Use of mobile cryo-protections
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To be done in LS 1: 2013/14
26/09/2011
IR 3 in 2013/14 (combined betatron/momentum cleaning in IR3 ) 8 locations of phase 2 (TCSM) ok Use Scraper location for additional TCP,
Layout modification (Cooling and cablesok, supports and vacuum chambers to do)
IR 7 in 2013/14 22 locations to be equipped with phase 2
plug-ins. Alignment of supports for phase2.
Points to work on: Pull cables for BPMs (IR3, other points, TCT?) Work on flow rate/distribution for the final system
(flow-fix?), upgrade of CV pumping system. Auto retraction – clutch?
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To be done in LS 1: 2013/14
26/09/2011
Produce and install cryo-protections?
IR 6 (Beam dump line modification (TCDQ, TCS...later?) 2 new TCSP’s BPM cables
Start replacing TCT’s with TCTP’s (with BPM), IR with priority?
Pull cables for BPM’s to defined positions?
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To be done/prepared for 2017?
26/09/2011
IR 1 and 5 4 TCLP’s (at Totem location) Install supports, alignment
Produce and install cryo-protections? Mobile as for IR 2?
Replace all TCT’s with TCTP’s (with BPM)
Replace other collimators with BPM version
Cryo-solution?
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Questions and Discussion
26/09/2011
Number of new collimators to be produced?:What type?
Change scraper locations (2) in IR 3 to TCP? IntegrationChange scraper locations (6) in IR 7 tohollow ebeam-lense?
Integrate TCT‘s into the Layout (IR 2 under study, IR 6, IR 8?)
Remove Roman Pots and install TCLP‘s to Point 1 and 5. When?
Keep and align Phase 2 slots? Transfer lines? Dump line?
CWG
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Questions and Discussion
26/09/2011
Any alignment related observations during operation?
Tolerance for realignment IR7 and IR3 (OP needs vs. RP)
What can be compensated by the collimators (transversal offsets, rotations)
Requests for LS1
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