BGV Task List

IDSorted ascending Task Priority State Assigned to Due date Description
1 Evaluate accuracy of β measurements in the locations considered for BGV installation High Open Plamen 2013-02-28 Consider also possible measures to improve accuracy (extra BPMs?)
20/01/13: plan to check talks and discuss with G.Trad; finally fill the “place search table”
2 Evaluate radiation in the locations considered for BGV installation High Open Plamen 2013-01-31 Yes / Done Used BLM data to determine the integrated dose due to charged particles. See slides. The expected yearly dose in IR4 after LS1 is about 45 Gy, and should not be a problem for BGV.
No Radiation due to neutrons?
3 Evaluate radiation induced by BGV High Open Plamen 2013-02-15 Used BGI experience to determine the dose in nearby BLMs vs (beam intensity * pressure), see this talk. Obtained "slope" 1. E-11 Gy/(mbar * s * proton). The resulting yearly dose has large uncertainty due to unknown pressure profile. Next steps:
Yes / Done Check only the 25ns runs. The periods with larger dose rate are not related to 25ns or other MD runs. A possible explanation is degraded vacuum conditions. More details are given in slide 24 of Plamen's updated talk
No Obtain possible pressure profile and update yearly dose projection (contact vacuum experts)
No Provide estimates of the expected dose as a function of the radial and longitudinal distance to the pressure bump (FLUKA simulation)
4 Consider the expected future changes of β and aperture in the locations considered for BGV installation High New -- 2013-02-15 20/01/13: after LS1 due to some use of "ATS-like" parameters; after LS3 for low β at IP5. Ask Massimo for more details and possible β maps
5 Check numerically the effect of dispersion on the emittance measurement Normal Closed Plamen++ 2013-03-01 Conservative estimates given in slides 27-28 of this talk. The effect of the dispersion on the beam size is of the order of 1 %, i.e. not negligible. Knowing the values of the dispersion (D) and the momentum spread (Δp/p) allows this effect to be taken into account.
Yes / Done Knowledge of Δp/p: Information from Elena Chapochnikova. Error on Δp/p determined by errors in bunch length and RF voltage. The former is known to be ≥ 15% (except if we find a more precise way to determine the bunch length, see below), the latter - about 5%.
Yes / Done Knowledge of D: Information from Ralph Steinhagen:
Precision on D: δ D ≈ 5 cm (conservative)
Precision on bunch length: relative error below 1%, with APWL (BI wall-current monitor)
? Update 25/02: Estimates of the additional uncertainty on the "betatron" beam width coming from imperfect knowledge of dispersion and momentum spread. See slides. Conclusion is that the error due to dispersion should be negligible even when aiming for relative error on the "betatron" beam width 1.8% (needed for measuring the beam emittance with relative precision 5%).
? 25/02: Task Closed
6 Specify the total amount of gas injected per year High New -- -- --
7 Design of a wake-field suppressor for the BGV vacuum chamber High New Bernd -- --
8 Produce a draft ECR Normal Open All -- --
9 Produce a gas target conceptual design proposal Normal New All -- --
10 Produce a detector conceptual design proposal Normal New Plamen, Massi, Bernd -- ? Search available detectors, propose system geometry (Massi)
? Toy simulation work with given geometry: performance, optimization (Plamen)
11 Make inventory of prototype detector system components Normal Open Massi 2013-04-15 --
12 Consider other IRs as possible locations for BGV installation High Open Plamen 2013-02-28 IR3, IR6 and IR7 are possible candidates, as they have frozen optics from injection to collision. This is true for nominal optics, but not for ATS
13 Consider the effect of high β gradient on the accuracy of the profile measurements Normal New Plamen 2013-03-31 ? Does the high gradient play any role for the precision of β
? Estimate the "hourglass" effect
14 BGV precision goals: rule of thumb calculations of what is achievable, based on current knowledge Normal Done Plamen 2013-03-31 See slides


Notes for users and contributors to the BGV task list

  • The formatting of this table uses the TWiki TablePlugin (see https://twiki.cern.ch/twiki/bin/view/TWiki/TablePlugin). Creating/editing table rows is very simple: just separate the desired value for each column with a "|" symbol
  • The tasks can be sorted by clicking on a column label (this will sort according to that criterion); By default the sorting is by "ID"
  • Plamen's recommendations (please feel free to update them):
    • Possible values for "Priority": Low / Normal / High
    • Possible values for "State": New / Open / Closed. The idea is to have "State" = "New" when a new task is created, while it should move to "Open" when a specific person(s) is assigned, and the work on the task has started. When a task is closed, it is recommended to have a summary of the outcome and/or a link to a document describing the results
    • "Assigned to": it should be OK to have only first names, without danger of ambiguity
    • "Due date": Use the format YYYY-MM-DD, which will allow sorting by that criterion. Use 01, 15 or 30 to signify start, middle or end of month (in case no exact date can be given)
    • In the "Description" field enter components/splitting of the task, as well as progress milestones. As mentioned above, when a task is closed, it is recommended to enter here the outcome and/or a link to a document describing the results
Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Task14_PrecisionGoals.pdf r1 manage 252.5 K 2013-03-25 - 09:30 PlamenHopchev  
PDFpdf Task2_v1.pdf r1 manage 203.0 K 2013-02-12 - 14:17 PlamenHopchev  
PDFpdf Task5_v1.pdf r1 manage 629.1 K 2013-02-25 - 22:10 PlamenHopchev  
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Topic revision: r16 - 2013-03-25 - PlamenHopchev
 
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