TCLD collimators
Description
Cleaning upgrade of the LHC dispersion soppressors is one of the core upgrades of the LHC for the HL-LHC project. This is achieved without (IR2) or with (IR7) new 11 T dipoles. The deployment in LS2 is mainly motivated by the upgrade of the ions beam parameters in Run 3, when an increase of ALICE peak luminosity by a factor 6-7 and an increase of a factor ~2 of ions beam intensity are foreseen.
One horizontal DS collimator, called TCLD, with Inermet-180 jaws will be installed in cell 9 on each side of IR7 for cleaning the outgoing proton and heavy ion beams. To make space, a standard 8.33~T main dipole (MB) will be replaced by two shorter 11 T dipoles with the TCLD in between.
One TCLD collimator will also be installed on each side of IR2 in cell 11, at the location of the connection cryostat, without 11 T dipoles, for heavy-ions operation only.
The TCLD design is the same for the two implementations. It feature 60cm jaw as well as in-jaw integrated BPM, which is a challenge for this compact design. TCLD are produced in industry: 4 devices for tunnel installation and 1 spare.
News and updates (last update: 28/04/2020):- First TCLD collimator installed in the LHC tunnel, left side of P2: TCLD-IP2-L
- Fotograph of the TCLD prototype built at CERN at the Feb. 2019 review, link.
Pictures
Layout DB functional positions
| Name of the new collimator | Coll. Plane | Upstream in-jaw BPM | Downstream in-jaw BPM | Tank BPM |
|---|---|---|---|---|
| TCLD.11R2.B1 | H | LHC.BPTUV.11R2.B1 | LHC.BPTDV.11R2.B1 | LHC.BPTUH.11R2.B1 |
| TCLD.11L2.B2 | H | LHC.BPTUH.11L2.B2 | LHC.BPTDH.11L2.B2 | LHC.BPTUV.11L2.B2 |
| TCLD.9R7.B1 | H | LHC.BPTUV.9R7.B1 | LHC.BPTDV.9R7.B1 | LHC.BPTUH.9R7.B1 |
| TCLD.9L7.B2 | H | LHC.BPTUH.9L7.B2 | LHC.BPTDH.9L7.B2 | LHC.BPTUV.9L7.B2 |
References
- EMDS No. 1953228, Overview of TCSPM and TCLD design and prototyping.
- EMDS No. 2082573 (IN PROGRESS), LS2 Collimators (TCLD, TCSP)- Manufacturing Review.
- LHC-TCLD-IP-0001 No. 2065159 (IN PROGRESS), TCLD installation procedure.
- LHC-TCLD-OP-0001 No. 2172273, TCLD collimator regular maintenance procedure.
- EDMS No. 1969909, TCLD (WP5) Specific Risk Assessment.
- LHC-TC-EC-0013 No. 1973028, Installation in IR7 of Dispersion Suppressor Collimators.
Status
| Assembly Id. | Link | Comments | Tunnel Photos |
|---|---|---|---|
| HCTCLDA001-CZ000001 | MTF |  All photos | |
| HCTCLDA001-CZ000002 | MTF |  All photos | |
| HCTCLDA001-CZ000003 | MTF | Spare collimator | |
| HCTCLDA001-CZ000004 | MTF | Spare collimator | |
| HCTCLDA001-CZ000005 | MTF | Spare collimator | |