Present: Ray, Rhod, Adriana, Christos, Thibaut, Enrico
Gas Jet Developments for HL-LHC (Ray)
- Proposed non-invasive monitoring for parallel e-beam & proton beam profiling
- Hollow e-lens
- Long Range Beam-Beam Compensator based on e-beam
- Collaboration
- HL-LHC UK - Cockcroft for gas jet development
- 2 systems (proto/test bench in 2017 & installable device for LS2)
- GSI
- Luminescence monitoring
- Feasibility report & optics design by mid 2017
- 2 Techniques being investigated
- Gas sheet
- Gas pencil beam
- Gas Type
- N2 investigated so far but not preferred for LHC as its pumped by NEG & will saturate NEG over time
- Looking to noble gases e.g. Neon an alternative
- Simulation Challenges
- Pressure range spans 11 orders of magnitude (10bar to 10-7mbar)
- Geometric details range over 4-5 orders of magnitude
- Nozzles from ~30 μm with transport over ~ 1 m
- Simulation results
- Addition of baffles before dump to limit backscattered molecules re-entering interaction chamber
- Good agreement with experimental pressure measurements
- Luminescence results
- Clear indication of gas sheet observed but integration times very long
- Main reason is limited current of e-beam (uA)
- Currently being replaced (mA)
ACTION/Next Steps
- Integration into SC solenoid for hollow e-beam (Ray & Adriana with MME)
- Input on e-beam size & corresponding curtain size (Adriana)
- Plans for future gas luminescence measurements (Ray & Rhodri to clarify with Cockcroft & GSI)
Lumi design for HL : Test Plans in 2017 (Enrico)
- Prototype (quartz & air)
- Cherenkov
- Quartz probably only valid for low lumi IRs
- In 2017 mainly to test high radiation dose dosimeters for RP in IR1
- Geometry of TAXN for HL
- Space greatly reduced between beampipes
- Where is the neutral shower a maximum?
ACTIONS:
- Where we can place a monitor?
- Need to look in detail at TAXN design (Enrico)
- How much of the neutral shower can be intercepted?
- Look at effect of crossing angle (Enrico / Marcus)
- TAXN design & simulations
- To be scheduled for presentation in WP13 April/May meeting
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