ID | 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 | 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. 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: 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 Obtain possible pressure profile and update yearly dose projection (contact vacuum experts) 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. 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%. 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 |

- 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

I | Attachment | History | Action | Size | Date | Who | Comment |
---|---|---|---|---|---|---|---|

Task14_PrecisionGoals.pdf | r1 | manage | 252.5 K | 2013-03-25 - 09:30 | PlamenHopchev | ||

Task2_v1.pdf | r1 | manage | 203.0 K | 2013-02-12 - 14:17 | PlamenHopchev | ||

Task5_v1.pdf | r1 | manage | 629.1 K | 2013-02-25 - 22:10 | PlamenHopchev |

Topic revision: r16 - 2013-03-25 - PlamenHopchev

** USEFUL LINKS **

** TWIKI TOOLS **

** TWIKI DOCUMENTATION **

Copyright &© 2008-2022 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.

or Ideas, requests, problems regarding TWiki? use Discourse or Send feedback

or Ideas, requests, problems regarding TWiki? use Discourse or Send feedback