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

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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)

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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

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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

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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?

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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