LHC Collimation Working Group - List of action items

LHC Collimation Working Group
(former LHC Beam Cleaning Study Group)

List of pending actions from previous meetings

104^th meeting of August 24^th, 2009

Priority	Task	Responsible	Status
	Procedure for the SPS-LSS5 change layout request for the installation of the BPM-equipped collimator prototype.	A. Bertarelli, R. Assmann	Ongoing
	Provide energy deposition inputs for Phase II collimators to MME	Luisella Lari	Ongoing
	RBAC and MCS deployed on all the collimators in the tunnel.	S. Redaelli, A. Masi	Ongoing
	RBAC: roles and people for injection and dump collimators.	R. Assmann, B. Goddard, S. Redaelli	Ongoing

103^rd meeting of April 27^th, 2009

Priority	Task	Responsible	Status
	Inputs expected from TOTEM before the beam operation: (1) hardware parameters for the mechanical references (2) handling critical calibration data for LVDT sensors TOTEM Summer (3) hardware commissioning in the tunnel and feedback to OP	TOTEM team	Pending
	Follow-up open issues for software implementation, as found in first controls integration tests.	S. Redaelli, M.Dutour, S. Ravat	Ongoing
	Agreement on Roman pot names for the communication between TOTEM control room and CCC during operation. See the operational database web page at this link.	TOTEM / OP	Done
	Change of definition of “beam energy for physics” for the cross-calibration runs of Roman pots/collimator postioins.	MPP	Ongoing

99^th meeting of March 2^nd, 2009

Priority	Task	Responsible	Status
	FLUKA simulations of reference case for losses without cryo-collimators Results presented at the collimation review.	FLUKA team	Done
	Comprative studies for different materials of cryo-collimator Results presented at the collimation review.	FLUKA team	Done
	Detailed calculation and implementation of BLM collimator thresholds	G. Bellodi, FLUKA team	Done
	Ion requests for temperature sensor locations in IR3/IR7 Follow-up after the meeting: no additional requests for ion in the warm insertion.	J. Jowett, G. Bellodi	Done

98^th meeting of February 16^th, 2009

Priority	Task	Responsible	Status
	Is it possible to compensate for the BLM cable length in order to have correct measurements for short int. time (instead than modifying the bump thresholds)?	BLM team	Pending

97^th meeting of December 17^th, 2008

Priority	Task	Responsible	Status
	Feasibility of bunch-by-bunch BLM gating for the LHC monitors of the transfer line collimators	BLM team	Pending
	Review settings of collimator BLM thresholds impemented for the 2008 operation	BLM + collimation teams	Pending
	Schottky pick-up to measure off-bucket beam properties?	F. Caspers	Pending

96^th meeting of June 16^th, 2008

Priority	Task	Responsible	Status
	Optimize on-line analysis required for TL collimator alignment	Coll & Inj teams	Pending
	Follow-up SPS MD planning for collimator tests	S. Redaelli	Ongoing
	Detailed calculation and implementation of BLM collimator thresholds	BLM team	Ongoing
	Collimator dump thresholds for ion operation	J. Jowett	Pending

94^th meeting of February 18^th, 2008

Priority	Task	Responsible	Status
	Submit a request for collimator MD's at the SPS (as discussed in the meeting) See summary in the slides of S.Readelli and overall planning discussed at the APC.	R. Assmann	Done
	Determine case studies for fast BLM data transmission to be tested in the 2008 SPS MD's	M. Jonker	Pending
	Upgreda old CSS collimator FESA class to the new OP system of the FESA gateways.	M. Jonker	Done
	Provide to the BLM team the damage limits in proton losses per second for the various collimator types. Table distributed by R. Assmann.	R. Assmann	Done

93^rd meeting of February 4^th, 2008

Priority	Task	Responsible	Status
	Provide AT-VAC a list of location for additional temperature measurements in IR3 and IR7. See presentation by M. Brugger on vacuum pipe heating. Follow-up on Collimation meeting of March 2nd, 2009: Proposal by AT-VAC: Excel file, PDF of IR3, PDF of IR7.	Coll. team + FLUKA + VAC	Done
	Provide to the FLUKA team the expected vacuum pressure and residual gas distribution in IR7. Follow-up: M. Jimenez provided the following estimates: - Gas composition: Hydrogen will be the main component. - Static pressure of the order of 2-5 10e10 mbar - Dynamic pressure: due to outgassing, it is expected to increase the pressure by a factor 10 for a deltaT of 50 deg. Desorption from impacting protons and electromagnetic showers has not been estimated in detail yet. - See latest paper by A. Rossi at the LHC background workshop.	AT-VAC	Done
	Procurement/set-up of third collimator prototype for impedance measurements. The third prototype has been procured and is available for tests. However, it must be used for an unexpected endurance test of the mechanics (discusses at the CPS meeting of 19/02/2008). The prototype readiness for impedance measurements is POSTPONED accordingly (a delay of a few weeks is expected).	O. Aberle	Done
	Perform additional impedance measurement of (1) Final samples of collimator Carbon materials (2) Tungsten collimators	R. Assmann (procurement) ABP impedance team	Ongoing
	Definition of energy deposition studies for collimator Phase I	ABP + FLUKA teams	Ongoing

92^nd meeting of January 21^st, 2008

Priority	Task	Responsible	Status
	Implementation of energy limits for collimator gaps	A. Masi	Done
	Configuration of collimator inputs to the BIC's Table with BIC connections: PDF (include also collimators not installed for 2008 run).	A. Masi	Done
	Planning for collimator HW commissionig (per sector) First planning that takes into account the constraints from HW commissioning was presented at the CPS meeting of 19/02/2008; Further updates will be announced here.	Followed up in the CPS meeting of 19/02/2008	Done
	Specification document for automatic beam-based procedures (input for AB/CO development)	R. Assmann, M. Jonker	Pending
	Calibration and interlocking issues for the fifth collimator axis (transverse tank movement)	ATB-LPE	Pending
	Propose temperature dump levels for the various colliator types Update, Oct. 2008: Proposal given in April 2008 to E. Blanco and fully implemented into the controls of the 2008 system (~400 temperture sensors)! Values for the first year of operation: Jaw measurement: Warning: ≥ 45 ºC Interlock: ≥ 50 ºC Measurement of cooling water temperature: Warning: ≥ 30 ºC Interlock: ≥ 35 ºC	RA+SR	Done
	Collimator damage level during impacts of ion beams JJ: awaiting DPA Implementation in FLUKA	J. Jowett, R. Bruce	Pending
	Finalize the collimator MTF steps for the hardware commissioning	T. Weiler	Done

91^st meeting of December 13^th, 2007

Priority	Task	Responsible	Status
	Provide details of collimator FESA classes to E. Carlier Update, summer 2008: Description of the FESA interface for movable devices described in the EDMS note number 934341 by S. Redaelli). This defines the interface for setting and measurement properties, including the MCS thresholds, as well as the machine states.	Collimator control team	Done
	Prepare a TCDQ class with the same set/get properties at the collimator class Update, Oct. 2008: Interface for get and set properties (including threshold limits) implemented and successfully tested in preparation to the beam operation. Follow-up of the implementation for the 2009 operation is ongoing.	TCDQ controls team	Done
	Follow-up TCDQ protection aspects and detailed implementation	R. Assmann, R. Schmidt, B. Goddard	Ongoing

90^th meeting of December 10^th, 2007

Priority	Task	Responsible	Status
	Feasibility of upgrading the collimator prototype in the SPS to the final LHC hardware for beam tests in 2008. The SPS prototype cannot be upgraded for the 2008 run. The prototype will be left into the machine with the present hardware and will be kept operational for the 2008 run.	R. Assmann	Done
	Procurement of collimator FESA servers	R. Assmann, M. Jonker	Done
	Final design of collimator FESA class	M. Jonker, ATB-LPE, OP	Done
	Follow-up of pending COCOST actions (details here)	M. Jonker	Ongoing

Updated action list for energy deposition studies (summer 2007)

Priority	Task	Responsible	Status
	Energy deposition in cold magnets from direct beam losses and gas scattering	FLUKA team	To be reported
	Passive absorber: performance with skew halo	FLUKA team, input from ABP	Done
	Design of absorbers with movable aperture	FLUKA team	To be reported
	Intervention scenarios, dose to personel for passive absorber repair [FLUKA inputs are ready]	SC-RP	Ongoing
	Performance of one-sided system	FLUKA team, input from ABP	Ongoing
	System performance with various commissioning scenarios (larger gaps)	FLUKA team, input from ABP	Ongoing
	Implementation of simulation errors: flatness, tilt errors, ...	C. Bracco -> FLUKA team	Ongoing
	IR3 FLUKA model, comparison with IPHE results	FLUKA team, input from ABP	Ongoing
	TCT damage level and corresponding BLM thresholds (1 nominal bunch)	FLUKA team	Pending
	TCLI protection performance	Y. Kadi	Ongoing
	Updated BLM response matrix for commissionign scenarios (Final BLM layout)	FLUKA team, input from ABP	Pending

	Related topics: Physics development: DPA implementation	G. Smirnov, A. Ferrari	To be reported
	Related topics: Physics development: ion scattering	G. Smirnov, A. Ferrari	To be reported

89^th meeting of July 12^th, 2007

Priority	Task	Responsible	Status
	Perform measurements of collimator low-frequency impedance	F. Roncarolo, B. Salvant	Ongoing
	Material procurement and control test stand availability for impedance measurements	R. Assmann, M. Jonker	Done
	Finalize the layout of the passive absorbers. Do we need additional protection? Do we want to ask for a change of the vacuum layout?	R. Assmann, FLUKA team	Done
	Investigate repair scenarios for the passive absorbers and corresponding radiation doses	Coll. Design team + SC-RP	Ongoing
	Dust production in the Tungsten material of the passive absorbers	Collimation WG	Pending
	Passive absorbers: energy deposition and dose studies for new operational scenarios: (1) larger collimator gaps; (2) reduced collimator system	FLUKA + SC-RP team (inputs from ABP coll. team)	Pending

88^th meeting of July 4^th, 2007

Priority	Task	Responsible	Status
	Implementation of crystal scattering routing in tracking tools	V. Previtali	Done

86^th meeting of May 7^th, 2007

Priority	Task	Responsible	Status
	Scraper design: provide assumptions/inputs for design	R. Assmann, S. Redaelli	Pending

85^th meeting of April 23^rd, 2007

Priority	Task	Responsible	Status
	TCDQ halo load: normalization of impacting particles	L. Sarchiapone, T. Weiler	Done
	Follow-up of 2007 SPS MD preparation	S. Redaelli	Done

79^th meeting of November 27^th, 2006

Priority	Task	Responsible	Status
	BLM thresholds for ions The baseline is to use the same thresholds used for protons.	Ion collimation team	Done
	BLM thresholds for collimator damage (TCT in particular)	Fluka team + TS team	Pending
	Proton losses in W/m for comparison with ion loss maps	T. Weiler	Done

74^th meeting of July 17^th, 2006

Priority	Task	Responsible	Status
	Temperature margins using as inputs realistic proton loss distributions	ABP team -> D. Bocian	Done

70th meeting of May 22nd, 2006

Priority	Task	Responsible	Status
	Understand different loss locations for B1 and B2	G. Robert-Demolaize	Pending
	IR7 Fluka studies for B2	Fluka team	Pending
	Include active absorbers (TCLA's) in the ion loss studies	Ion team	Ongoing
	Ion cleaning and loss maps with different TCP and TCS settings	Ion team	Pending
	Locations of additional BLM for ions in IR3	Ion team	Done (Note)

69th meeting of May 8th, 2006

Priority	Task	Responsible	Status
	Effect of orbit and beta-beat on the ion losses downstream of IR7	Ion team	Ongoing
	Impact on the BI budget of additional BLM proposed for protons and ions	BLM team	Done
	Why off-momentum protons touch first a TCTH instead than the TCP of IR3?	Ion team	Done
	TCDQ halo load with single-sided collimation system	L. Sarchiapone, T. Weiler	Done
	TCDQ halo load with missing secondary collimators	L. Sarchiapone, C. Bracco	Done

68th meeting of March 20th - LHC ion collimation studies, 2006

Priority	Task	Responsible	Status
	BLM location in the dispersion suppressor of IR7	Ion + ABP + BLM teams	Done
	Take into account crossing and separation bumps	LHC ion team	Ongoing
	Check the losses in the middle of the quadrupoles and not only at the magnet end	LHC ion team	Pending
	Setup ion collimation with SixTrack?	LHC ion team + ABP team	Pending
	Accident scenarios with ion beams	LHC ion team + FLUKA team	Pending
	Are TCT's required at IP2 for the early ion scheme?	LHC ion team	Done
	Updated simulations setup: (1) Increase particle diffusion speed every tracked turn instead than every 100 turns; (2) separate load contributions from different halo types (horizontal, vertical and skew); (3) Include TCLA's at IR3 and IR7	LHC ion team	Pending
	Improve the efficiency by reducing the length of the primary collimators?	LHC ion team	Pending

67th meeting of March 20th - Plan for future FLUKA activities, 2006

Priority	Task	Responsible	Status
	Energy deposition studies with skew halo	ABP team	Done
	Cross-check FLUKA and IPHE simulations (model IR3 with FLUKA and IR7 with MARS)	FLUKA and IPHE teams	Pending
	Energy deposition at IR7 at injection energy	FLUKA team	Done
	Write-up documentation of the work carried out in the last months	FLUKA team (Mario)	Done
	Deposited energy in BLM's and cross-talk.	FLUKA and BLM teams	Done
	Thermo-mechanical calculations of failure scenarios at 7 TeV with 60cm long TCP's	A. Bertarelli	Done
	Energy balance	FLUKA team	Done
	Deposited energy for various commissioning scenarios	ABP and FLUKA teams	Ongoing
	Direct proton losses versus deposited energy in the cold magnets of IR7	ABP and FLUKA teams	Pending
	FLUKA model of IR7 for beam 2	FLUKA team	Pending
	Phase II studies - effect of different materials for the TCS	FLUKA team	Pending
	Halo loads on the TCDQ and downstream elements	ABP and FLUKA teams	Done
	Halo loads on the TDI and downstream elements	ABP and FLUKA teams	Pending
	Failure scenarios at injection	ABP and FLUKA teams	Pending
	Energy deposition studies for SPS and TT40 tests with beam	ABP and FLUKA teams	Done
	Crystal studies - deposited energy by channeled halo particles	ABP and FLUKA teams	Pending
	Define BLM thresholds for damage and deformation limits of the collimators (notably, for the ones in Tungsten)	FLUKA team	Pending

67th meeting of March 20th - Additional items, 2006

Priority	Task	Responsible	Status
	Implications of final IR7 layout on the bake-out system	R. Assmann -> AT-VAC	Done
	Difference between IR7 and IR3 (the latter requires less absorbers)	IPHE team	Pending
	Effect of deposited energy on the performance of various IR7 equipment	Equipment owners	Done
	Cooling required for passive absorbers	TS-MME	Done
	Report on tolerance for Ozone production at IR7	O. Aberle	Pending

Old action list from 2005

Date	Task	Responsible	Completed
10.10.05	Cross check geometry of MBW's for the IR3 simulations of deposited energy	R. Assmann -> J.B. Jeanneret and IPHE team	Done
	Follow-up of simulation of radiation doses at the MBW's of IR7: (1) Move passive absorbers in contact with the MBW coil (2) Scaling law for radiation doses versus absorber length (3) Try different material (W layer in critical regions?) (4) "Movable" passive absorbers, like the TCLA?	FLUKA team	Done
	Review simulation results of Ozone production at IR7.	A. Presland	Solved after the meeting
	Investigate the production rate versus air speed.	A. Presland	Done
	What is the tolerable Ozone density for IR7?	O. Aberle	Done
	Check drawings of vacuum interconnects	R. Assmann, O. Aberle + B. Dehning for BLM's	Done
	Provide deposited energy at the BLM locations	FLUKA team	Done
	Larger statistics on beam loss maps for failure scenarios of secondary collimators becoming a primary collimator	ABP collimation team	Done
	Setup tracking and beam loss simulations for beam 2	ABP/LOC section -> ABP collimation team	Done
	Force on the coils of the MBW magnets during field ramping. Effect on the epoxy spacer.	S. Ramberger	Done

19.09.05	Compare code developed at the Kurchatov institute with ANSYS for the case with no electromagnetic effects.	A.Ryazanov's team	Pending
	Convert the presented results in SKM unit system	A.Ryazanov's team	Pending
	Setup simulation with a real collimator geometry	A.Ryazanov's team	Pending
	Investigate the feasibility of a target beam test in 2006 to validate the simulation code by A.Ryazanov's team	J. Lettry, R. Assmann, A. Bertarelli	Done

27.06.05	Follow-up/proposal for a feedback test with collimators during the 2006 tests with beam at the SPS	R. Assmann, J. Wenninger	Pending
	Finalize the calculations of quench limit for the various LHC superconducting magnets	R. Assmann, L. Rossi	Pending
	Cross-check of energy deposition simulations for proton and ion studies	V. Vlachoudis, J. Jowett, R. Bruce	Ongoing
	Cross-check crossing and separation schemes in the simulations of ion losses	H. Braun	Pending
	Estimate the contribution of various halo load for ion simulations	H. Braun	Pending
	Review formulae for temperature dependence of specific heat	A. Presland, Fluka team	Done
	Energy deposition studies for asynchronous damp at 7 TeV with misfired bunches impacting on a secondary collimator	A. Presland, input from ABP team	Done
	Check if the deposited energy in the flanges is acceptable in the case of accident case scenario at 7 TeV	A. Presland with C. Rathjen	Done

13.06.05	Energy deposition studies with 60 cm long primary collimators at IR7	Fluka team, inputs from ABP team	Done
	Accident scenario with 60 cm long primary collimators at IR7	Fluka team + A. Bertarelli	Done
	Effect of TCP angle on cleaning performance and beam loss	ABP team	Pending
	Provide maps of deposited energy at the BLMs	Fluka team	Done
	Follow-up the feasibility of reducing the aperture at the passive absorbers of IR7	Fluka team + C. Rathjen	Done
	Deposited energy in the coil of the dogleg dipoles of IR7, at the location where the coil is close to the vacuum pipe	Fluka team	Done
	Energy balance: how much goes into the beam pipe	Fluka team	Pending

	Check the old list of pending items!