RECENT DEVELOPMENT OF THE SUPERSONIC GASJET BEAM PROFILE

RECENT DEVELOPMENT OF THE SUPERSONIC GAS-JET BEAM PROFILE MONITOR Dr. Hao Zhang

Outline 2 Motivation Experimental Setup Skimmer size and resolution Jet distribution measurement International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Motivation 3 Diagnose the particle beam non-invasively Preserve the vacuum more effectively Better understand the gas-jet dynamics when using this monitor International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Get-jet Monitor Setup 4 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Generation of Supersonic Gas jet* Pb For our case, P 0 = 5 bar, Pb ~ 1. 0 e-3 mbar => x. M/d = 1500; d =30 mm=> x. M = 45 mm * 5 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Skimmers & MCP V. Tzoganis, et al. IPAC 2013 6 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

2 -dimentional profile imaging Y X V. Tzoganis, et al. IPAC 2013 7 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Resolution VS 3 rd skimmer size Skimmer size 7. 2× 1. 8 mm 2 4× 0. 4 mm 2 Oriental angle 45˚ 32˚ Beam size mm mm sx (Gas jet) 0. 42 0. 56 sy (Gas jet) 1. 23 0. 53 sx (Residual 1. 01 1. 52 Gas) 8 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Resolution problem Gas jet curtain Beam size 1 Particle beam Beam size 2 ? ! The gas curtain distribution will affect the resolution of this method. Having a method to know the pressure distribution of the system will help us understand the gas curtain distribution better. 12 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Newly installed compression gauge module Compression Gauge Module Gas jet curtain Slit size 15 10. 0 × 2. 0 mm 2 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

First meaningful result 1. 5 s The blue curve represent the case when partial of the jet enters the compression gauge module through the slit, while the purple one shows the case that there is no jet entering the slit and the pressure bump is from the overall pressure change due to the jet flowing into the first dump chamber 16 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Vertical Scan 17 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Gaussian fit s (mm) 18 1. 01 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Automation for moveable Gauge Scan Scope Master Trigger Pulse Generator 24 V DC Voltage Supply 19 PC Pico. Current Meter Pulse Valve Relay Camer a Moveable Gauge International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Time Sequence Take photos (Matlab controlled software trigger) Pulse valve open (Pulse generator) Move gauge position by step motor(Matlab Controlled) 4. 0 s delay (pulse generator) 10. 0 s delay 4. 0 s delay Scope start (Matlab Controlled) 20 Pulse generated by Camera strobe (Matlab Controlled) Scope stop and transfer data International Conference on Accelerator Optimization, Seville, Spain, (Matlab 09/10/2015 Controlled)

2 D Scan About 32˚ 7. 5 mm 6. 0 mm 21 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Mach Disc study Pb For our case, P 0 = 5 bar, Pb ~ 1. 0 e-3 mbar => x. M/d = 1500; d =30 mm=> x. M = 45 mm Fro m 22 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Gauge pressure VS Nozzle skimmer distance This curve give a Mach disk about 25 mm, which is in the same order of magnitude with the calculation. 23 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Conclusion and Future Work Summary � By reducing the 3 rd skimmer size, we improve the resolution of the jet image. � Developed a moveable compression gauge module to measure the jet distribution. � Automated the moveable gauge measurement process � Preliminary result of the jet distribution agree with the setup � Gas dynamics study about the Mach disk. 24 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015

Any Questions? Thank you 25 International Conference on Accelerator Optimization, Seville, Spain, 09/10/2015