Forward physics pertinent ECRs

Mike Lamont, Samy Chemli

Forward physics ECRsTitle EDMS When Status

Temporary Installation of LHCb Scintillating Fibre Tracker Test-Beam Module in RB84

LHC-X8FC-EC-0002 TS3 Approved

Optical Fibres & High Voltage Cables for the CMS ZDC Upgrade

LHC-X5ZDC-EC-0002 TS2 Approved

Change of Powering for Q4 in IR1 LHC-LJ-EC-0044 YETS Approved

CT-PPS Timing & tracking detectors in horizontal Roman Pots (for standard optics)

LHC-XRP-EC-0012 YETS

TOTEM Timing detectors in vertical Roman Pots (for high beta*)

LHC-XRP-EC-xxxx TS3

Installation of the ATLAS/AFP stations, Phase-1

LHC-XAFP-EC-0002 YETS Approved

CMS ZDCs – fibres and cables

• Optical Fibres & High Voltage Cables – Approved and good to go… – powering permit issue discussed at last LMC– “moving slightly the BRAN by a few centimetres”?

• For info, there will be a remote camera system to operate the crane above the TAN remotely (see EDMS 1510701 LHC-HXTC-OP-0001). – Samy: This document is still under approval and I just intended to

inform the LMC when released. – Nothing more than informing, but I still have 6 or 7 documents

still pending with Michael Murray.

S. Chemli for EN-MEF-DC 4

ECR Under Approval

LHC-X5ZDC-EC-0002Version 0.2 → 2015-06-23

Installing Optical Fibres & High Voltage Cables for the CMS ZDC Upgrade

2015-08-12

A few questions from EN-EL to be answered

Change of Powering for Q4 in IR1

• Freddy: – budget code assigned to cover the cost of cables

for the dual powering of the Q4s in IP1 for ATLAS-ALFA (LMC 224)

• Space reserved for Q4 (but not Q8, Q7, Q10)

• Status of procurement?

TOTEM timing detectors

• TOTEM Timing detectors in vertical Roman Pots (for high beta*)– a) TOTEM picosecond clock distribution– b) Timing detectors – c) Services for the different subcomponents (HV, LV, cooling,

services, etc.)

• At present it looks promising, that we can install the

first components during the TS3 in 2015, to be still tested with the LHC during 2015. – We try to provide the TOTEM ECR by mid September 2015.

Joachim Baechler

CT-PPS Timing & tracking detectors • CT-PPS Timing & tracking detectors in horizontal Roman Pots (for

standard optics) – a) CT-PPS reference timing system – b) CT-PPS timing detectors – c) CT-PPS tracking detector – d) Services for the different subcomponents (HV, LV, cooling, services, etc.)

• In this sense we can already now discuss the issues related to the laying of the cable for the CT-PPS clock distribution before the final ECR is ready. (contact company to give cost estimate and time line).

• At the present state I do not see components for the CT-PPS project to be installed in 2015. The installation work could start in the end of year shut down 2015. We try to provide the ECR by October 2015.

Joachim Baechler

CT-PPS Timing & tracking detectors The CMS-TOTEM Precision Proton Spectrometer (CT-PPS) [1] project proposes to installa reference timing system in the second half of 2015, with an electronics module at +215 m from IP5 and another electronics module at -215 m from IP5. There will also be a power supply for each electronics module. In addition, a coaxial cable connecting the two modules needs to be installed and will be laid through the bypass tunnel. Details of theelectronics modules, power supplies, and coaxial cable are given. The lifetime of this upgrade project is foreseen to last until LS3.

TOTEM – CT-PPS

• What does the Totem team intends- to do during TS3 and the YETS?

• Two parallel options for different optics to give the timing - which has the priority?

• Need to give proper instructions to the people installing the cable– they don’t know what to order for the YETS…

• One of the ECRs I have since April and still not the green light to launch it.

Samy Chemli

AFP

AFP discussion 1/3

• Experience from TOTEM/ALFA in 2015– Looking good so far– UFOs on 1 ALFA pot – ferrite?

• Ferrites– Buy the right ferrite – “it’s the way they cut it”– Reference Giuseppe and Fritz– AFP need lead time – MR will look into it

• NB 2.5 mm gap to bellows

20th July 2015: Michael Rijssenbeek, Benoit Salvant, ML

AFP discussion 2/3• Heating with beam

– In parking with 1200 bunches at 450 GeV – some heating already observed– Cooling has to be verified

• Copper coating on bottom of pot – is it feasible?– Would reduce resistive wall heating.– ALFA isn’t, TOTEM isn’t (technical problems)– If not there then possibly faced issues from beam induced heating if

aiming to be qualified for Run 3/HL-LHC – Run 3 – could be intensity limits – even in parking (worry about this

particularly)• NEG coating

– Parts of assembly but not pots themselves– again this could imply constraints – check with e-cloud team

AFP discussion 3/3

• RF shields inside bellows and connections• Window (30 mm diameter)

– Quartz viewpoint for calibration of pot in lab– To be removed before operation, replace with blank flange

• Cu O ring – detailed drawing available – “fine tuning”• All pots checked in lab for non-conformities• Impedance

– Measure prototype early Oct. – Production pots – measure in November to validate

Follow-up by Michael Rijssenbeek• Copper coating of the flat part of the AFP Roman pot bottom (area around the thin window

facing the LHC beam). This will improve the RF behavior of the Roman pot. See the attached figure, where the proposed coating area is bounded by red lines. The thickness must be about 10 um. Questions:– Who would do this? How much lead time is required? How much time is involved with the coating

procedure itself?– Solution: 5 microns (doable with with sputtering) would still help a lot RF-wise and would be much easier

than doing the galvanic bath (Benoit et al)• NEG coating of the interior beam chamber extensions of the Roman pot station central vacuum

assembly (see attached figure, where the areas to be NEG-coated are delineated in red)). This will improve the primary vacuum. Questions:– Who would do this? How much lead time is required? How much time is involved with the coating

procedure itself?– How stable is the coating? Does it scratch and flake-off easily?

• Ferrites for RF absorption. I understand from Benoit that very recently ferrites TT2-111R by Trans-TechInc.com, USA, with a very much improved fabrication procedure were measured to have excellent UHV behaviour without having to fire them at 1000 C for an extended amount of time. Questions:– Do you have more details of this latest development and measurement? – The AFP ferrites, see also the attached drawing, are identical in dimensions to those used for ALFA. We

need to order these ferrites for AFP very soon and I would appreciate purchase information (DAI copy, Lead time, bake-out information if so needed).

Ferrites

• For information, the “new ferrites” are still the same TT2-111-R. – Only the machining process at the end of fabrication is being

changed since it has been suspected for some time that it could be responsible of the bad vacuum behaviour of these ferrites (without high temperature firing).

• If the new process is validated, the impedance team recommends that it should be implemented as soon as possible for any new TT2-111-R ferrite that is installed in the machine. – It is clear that it may be too late for the 2 AFP Roman pots planned

to be installed during this YETS, but it should not be too late for the second batch of pots that are planned to be installed in the EYETS.

Benoit Salvant

NEG - Mauro Taborelli• To question B:• What do you mean with primary vacuum? Which pressure do you have

there? I was supposing it is in the beam vacuum......• We can do it, if it is accurately planned the coating itself is roughly one

week including mounting and dismounting (and some margin), but for this we need to have all the cathodes and extensions for vacuum ready. It should be planned well in advance. You must also consider that the part must be first cleaned in the cleaning workshop and it is not easy and safe to clean edge welded bellows; we will do it at best.

• Do you want the coating only in that region? We probably need some masking again, it is easy , but it needs some mechanics.

• There are 7 km of coating in the LHC.....hopefully it is stable J. As any coating if you scratch sufficiently hard it will come off, but you are not supposed to scratch right?