1 / 8

Current LSS Schematic view and BPM layout:

Current LSS Schematic view and BPM layout:. BPTX BPMWB BPMSY BPMS BPMSW. L1. Longitudinal position is not critical. Avoid parasitic beam crossing.

tyler-hopkins
Télécharger la présentation

Current LSS Schematic view and BPM layout:

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Current LSS Schematic view and BPM layout: BPTX BPMWB BPMSY BPMS BPMSW L1 Longitudinal position is not critical Avoid parasitic beam crossing BPTX BPMWB BPMWT(XRP) BPMSY BPMS BPMSW L5

  2. Optimum positions are every 12,475nS : 20.569 m; 24.308 m; etc Simulations results give: Range: X +- 375mm: measurement still OK for all beam1/beam2 parameters. Range: X +- 750mm: measurement still OK for nominal parameters, accurate weak beam on strong beam excluded.

  3. Current BPM positions in the triplet:BPMSY BPMS BPMSW Couplers Positions: Optimum Parasitic

  4. Should BPM be warm or cold ? Same Glass metal seal technology for Feedthroughs.Same SIO2 cables used to withstand radiations. • Warm • + Is more accessible for maintenance. • Should be capable of withstanding bake-out to 200°Cwhich is never safe. • Should be checked after each shut-down. • Cold • - Limited choice of materials. • - Is more complicated to design and integrate. • Components should be very reliable. • + Aligned with quadrupole. • + Less prone to modifications once installed.

  5. B1 Button vs stripline B2 Stripline Coupler + Directional Couplers used when the 2 beams are crossing in the same pipe. - 2 beam Outputs means 2 electronic chains with different responses. - Directivity measured as 23 dB at 200MHz is not sufficient to give requested 50um resolution. - Mechanically more difficult to build, less precise. • Electrostatic Pick-Up • - Not able to distinguish beam 1 and beam 2: time windowing should be developed. • + The same electronic chain for the 2 beams, means accurate measurements. • + Easy to build with a good precision, more compact. • + Flat frequency response. The 4 BPMWF installed this shut-down on side of BPMSW will allow to verify this concept.

  6. Current situation Size of a 130mm aperture stripline coupler: Integration issues (1) BPMS was tilted by 45°because too close to M4 line: Consider 300 mm length and 260 mm diameter area to connect the cables. Separate functions by welding the BPM body on a plug-in module.

  7. Current situation Cable integration Integration issues (2) What happen to the cables when the sleeve is installed ? A slot should be used to cross the thermal shield Best place to do cable length compensation: between thermal Shield and cryostat.

  8. Layout and integration studies should take in account area between TAS and Q1. - access and alignment difficult, high radiations, integration of many systems… This area ‘between machine and experiment’ is badly documented: integration issues (3) 1R1: the crowded black hole 1L5: alignment ! …

More Related