Gun Test Stand Meeting Minutes and To-Do Lists

Gun Test Stand Meetings

TGun status

2019

GTS meeting 10_21_19 T-Gun Progress and Work Plan

GTS meeting 10_14_19 T-Gun Progress and Work Plan

GTS meeting 10_07_19 T-Gun Progress and Work Plan

GTS meeting 9_30_19 T-Gun Progress and Work Plan

GTS meeting 9_23_19 T-Gun Progress and Work Plan

GTS meeting 9_16_19 T-Gun Progress and Work Plan

GTS meeting 9_09_19 T-Gun Progress and Work Plan

GTS meeting 8_26_19 T-Gun Progress and Work Plan

GTS meeting 8_19_19 T-Gun Progress and Work Plan

GTS meeting 8_12_19 T-Gun Progress and Work Plan

GTS meeting 8_05_19 T-Gun Progress and Work Plan

GTS meeting 7_29_19 T-Gun Progress and Work Plan, Survey

GTS meeting 7_22_19 T-Gun Progress

GTS meeting 7_15_19 T-Gun Progress, remaining tasks and schedule - GTS Photocathode Analysis

GTS meeting 7_08_19 T-Gun arrived today

GTS meeting 7_01_19 T-Gun will arrive at JLab on Monday July 8th

GTS meeting 6_24_19 T-Gun will arrive at JLab on Monday July 1st

GTS meeting 6_17_19 Disconnect P-Gun and Install T-Gun

GTS meeting 6_10_19 NAPAC 2019

GTS meeting 5_13_19 IPAC 2019

GTS meeting 5_06_19 Disconnect P-Gun and Install T-Gun

GTS meeting 4_22_19 Disconnect P-Gun and Install T-Gun

GTS meeting 4_15_19 Commissioning T-Gun Beamline

GTS meeting 4_08_19 Commissioning T-Gun Beamline and TE011 cavity

GTS meeting 3_25_19 Commissioning T-Gun Beamline

GTS meeting 3_18_19 Commissioning T-Gun Beamline

GTS meeting 3_11_19 Commissioning T-Gun Beamline

GTS meeting 3_04_19 Commissioning T-Gun Beamline

GTS meeting 2_25_19 Commissioning T-Gun Beamline

GTS meeting 2_18_19 Plan of Commissioning T-Gun Beamline

GTS meeting 2_11_19 Completed Beamline for T-Gun, T-Gun Beamline and New Ion Precipitator Drawings

GTS meeting 2_04_19 Beamline and Controls Modifications

GTS meeting 1_28_19 Beamline and Controls Modifications, T-Gun Beamline Drawings

GTS Beamline with Photogun at end of LDRD

GTS meeting 1_14_19 Beamline and Controls Modifications

GTS meeting 1_07_19 Beamline and Controls Modifications

2018

GTS meeting 12_10_18 Krypton Processing to 300 kV, Ion beam calculations

GTS meeting 12_03_18 Krypton Processing to 300 kV, Space Charge Effect in Magnetized Beam

GTS meeting 11_26_18

GTS meeting 11_19_18 GPT simulation of Space Charge effects in Magnetized Beam

GTS meeting 11_12_18 Ghost beam studies

GTS meeting 11_05_18 Ghost beam plans

GTS meeting 10_22_18 Summary of pulse energy vs bunch charge

GTS meeting 10_15_18 Summary of pulse energy vs bunch charge for 200 kV, 150 kV and 100 kV

GTS meeting 10_08_18 Space charge limit vs magnetization and laser pulse length, Bunch charge vs Frequency, Ion simulations discussion with Crhistian Valerio

GTS meeting 10_01_18 High bunch charge, Ions simulation by Cristhian Valerio

GTS meeting 9_24_18 28 mA run (100 kV, 150 Amps), GPT Space Charge Limit

GTS meeting 9_17_18 RadCon approved Currents: 100 kV @ 26 mA; 200 kV @ 15 mA; or 300 kV @ 4.5 mA

GTS meeting 9_10_18 16 mA Magnetized beam run, High currents plan, P3 Workshop abstracts

GTS meeting 8_27_18 New Spellman HV power supply

GTS meeting 8_20_18 Emittance vs Gun Solenoid, Magnetized lifetime measurement at 4.5 A (37 hours), ion-induced secondary electron beam, t-gun beam movie

GTS meeting 8_13_18 P3 Workshop

GTS meeting 8_06_18 Emittance vs Gun Solenoid, Magnetized Beam 2D and 3D Schematics

GTS meeting 7_30_18 More lifetime measurements, Emittance check with Gun Solenoid off

GTS meeting 7_23_18 Summary of lifetime measurements

GTS meeting 7_16_18 High current runs, GPT simulations of Beam Size vs Solenoid Current for 200 kV

GTS meeting 7_11_18 Photocathodes Sb deposition time studies, High current runs

GTS meeting 7_02_18 Photocathodes Sb deposition time studies, GPT simulations of normalized emittance vs z

GTS meeting 6_25_18 Photocathodes Sb deposition time studies, GPT simulations of normalized emittance vs z

GTS meeting 6_18_18 GTS updated plan, Photocathodes activation with different Sb deposition time, CST microwave studio simulations of 300 kV GTS gun

GTS meeting 6_11_18 Beam emittance vs magnetic field at photocathode (Laser rms = 0.32 mm)

GTS meeting 6_04_18 Beam size for different Pierce angle 1D field maps, Space Charge Simulation

GTS meeting 5_21_18 More HV conditioning, Photocathode surface and chemical analysis, Space Charge Simulation

GTS meeting 5_07_18 HV conditioning completed, Photocathode activation (moly substrate, 5 mm), New beamline Drawing

GTS meeting 4_30_18 IPAC'18 Final Proceedings

GTS meeting 4_23_18 IPAC'18 Posters + Proceedings

GTS meeting 4_16_18 IPAC'18 Posters

GTS meeting 4_09_18 IPAC'18 Contributions, Replace bad ceramic

GTS meeting 4_02_18 New ceramic, puck with molybdenum substrate, Gun bake, GTS Emittance Simulation

GTS meeting 3_19_18 Gun ceramic failure

GTS meeting 3_12_18 Emittance around damaged spots on photocathode

GTS meeting 3_05_18 ASTRA Beam size sensitivities

GTS meeting 2_26_18 Emittance Simulations vs spot location on photocathode

GTS meeting 2_19_18 Emittance vs spot location on photocathode, Emittance near damaged spot

GTS meeting 2_12_18 Emittance vs beam current, Emittance vs spot location on photocathode

GTS meeting 2_05_18 Emittance vs laser spot size, Beam size vs z for different Solenoid I, New beamline Drawing and 3D Views

GTS meeting 1_29_18 Harp and Viewer emittance measurements (5-300 kV), Laser profile

GTS meeting 1_22_18 Emittance measurements at Viewer 3, Harp scans

GTS meeting 1_08_18 ASTRA simulation, Harp commissioning

2017

GTS meeting 12_18_17 Final IPAC18 Abstracts, Harp commissioning

GTS meeting 12_11_17 IPAC18 Abstracts Poelker's edits, Harp commissioning, New beamline Drawing,

GTS meeting 12_04_17 IPAC18 Abstracts, Harp commissioning

GTS meeting 11_27_17 Fiber laser sizes, beam commissioning plan, GPT modelling

GTS meeting 11_20_17 Gain switched diode laser update, beam commissioning plan

GTS meeting 11_13_17 Gain switched diode laser update, beam commissioning plan

GTS meeting 11_06_17 Shutdown activities, gain switched diode laser update, beam commissioning plan

GTS meeting 10_30_17 Shutdown activities, gain switched diode laser

GTS meeting 10_23_17 Shutdown activities

GTS meeting 10_16_17 Shutdown started today

GTS meeting 10_09_17 Remaining tasks before shutdown

GTS meeting 10_02_17 High current runs, laser heating, Jay's GTS Magnetic field model, remaining tasks before shutdown

GTS meeting 9_25_17 High current runs - 3 mA

GTS meeting 9_18_17 New activation, differential orbits, new shutdown start date

GTS meeting 9_11_17 High current runs, differential orbits, shutdown plans

GTS meeting 8_28_17 Emittance measurements, shutdown plans

GTS meeting 8_21_17 Emittance measurements

GTS meeting 8_14_17 ASTRA simulation and emittance measurements, YAG facts.

GTS meeting 8_07_17 ASTRA simulation and emittance measurements

GTS meeting 7_31_17 ASTRA simulation and emittance measurements

GTS meeting 7_24_17 ASTRA simulation and emittance measurements

GTS meeting 7_17_17 Updates on magnetized beam sizes, ASTRA simulation and slit emittance measurement.

GTS meeting 7_10_17 Updates on magnetized beam sizes, ASTRA simulation and slit emittance measurement.

GTS meeting 7_03_17 Updates on magnetized beam sizes and rotation angles, ASTRA simulation and slit emittance measurement.

GTS meeting 6_26_17 Updates on magnetized beam sizes and rotation angles, ASTRA simulation and slit emittance measurement.

GTS meeting 6_19_17 Updates on magnetized beam sizes and rotation angles, ASTRA simulation and slit emittance measurement. Yan's UGM poster.

GTS meeting 6_15_17 Updated to-do list, discuss our simulation wish list

GTS meeting 6_12_17 Updates on magnetized beam sizes and rotation angles, emittance measurements, ASTRA simulation and slit emittance measurement

GTS meeting 6_05_17 JLab Annual Users' Group Meeting: Yan's Abstract and Poster Outline

GTS meeting 5_22_17 0.5 mA magnetized beam

GTS meeting 5_15_17 Instrumenting the Wire Scanner

GTS meeting 5_09_17 Meeting in LERF Break Room - Software Tasks

GTS meeting 5_02_17 Meeting in LERF Break Room - Attempting to deliver 1 mA - Cornell, Pozdeyev and Grames papers on ions, links to GTSLOG

GTS meeting 4_25_17 Meeting in LERF Break Room - Upgraded the laser system. Latest Drawings and 3D Views

GTS meeting 4_18_17 Meeting in LERF Break Room - Running beam to the dump

GTS meeting 4_11_17 Meeting in LERF Break Room - Finished bake of second part of beamline

GTS meeting 4_04_17 No Meeting - Open to finish second part of beamline - Summary of tasks for the down

GTS meeting 3_28_17 Meeting in LERF Break Room - Attempting to center gun solenoid - Emittance vs Gun HV

GTS meeting 3_21_17 Meeting in LERF Break Room - Attempting to center gun solenoid

GTS meeting 3_14_17 Meeting in GTS Control Room - Delivering magnetized beam. DO NOT TURN MAGNET ON WHILE GUN AT HV

GTS meeting 3_07_17 Meeting in GTS Control Room - GTS beam in ON

GTS meeting 2_28_17 Remaining Tasks - Very close to run beam

GTS meeting 2_21_17 Beamline and Prep Chamber successfully baked

GTS meeting 2_14_17 HV and Magnet conditioning seems to be OK for beam. Updates on cathode prep chamber and beam line. POISSON simulations comparing the T-electrode to the spherical electrode inside CEBAF style gun vacuum chamber

GTS meeting 2_07_17 HV and Magnet conditioning. Updates on cathode prep chamber and beam line

GTS meeting 1_17_17 Gun with Magnetized beam coil turned ON!!! Updates on cathode prep chamber and beam line

GTS meeting 1_3_17 Emittance measurement techniques

2016

GTS meeting 12_20_16 Gun conditioned to 350kV in vacuum, up to 365kV w/Kr, new scheme for puck grabbing in prep chamber, etc.

GTS meeting 12_06_16 High voltage conditioning with barrel polished electrodes, beam line, cathode solenoid magnet, etc...

GTS meeting 11_15_16 Laser power, gun bake update, beam line update

GTS meeting 11_08_16 Beamline update

GTS meeting 10_31_16 Gun HV chamber under vacuum, Improved Cathode prep chamber with Mamun's puck holder design is under vacuum!

GTS meeting 10_24_16 Gun HV chamber assembled, Cathode prep updates, beam line, P3 Workshop

GTS meeting 10_11_16 Updates: SS ball electrode assembly, gun chamber, prep chamber, beam line

GTS meeting 10_04_16 Updates on gun chamber, cathode prep and beam line.

GTS meeting 9_14_16 Shutdown work progress and discussion about photocathode 'arcing' during 1 mA beam runs, including Carlos' ERL'09 talk with FEL gun high current run observations.

GTS meeting 9_13_16 Shutdown work progress and really cool pictures of the removed multi-alkali photocathodes.

GTS meeting 8_30_16 Shutdown started!

GTS meeting 8_23_16 The way forward plan

GTS meeting 8_9_16 Discuss the new magnetized beamline

GTS meeting 7_25_16 Update since our last meeting, 1 mA for >6 hours!..battered cathode holds QE!!..QE scanner operational!!!...FE induced by hand-held magnet!!!!

GTS meeting 7_05_16 Better stability at 1 mA and 300kV with biased anode. Summary, what have we learned so far?

GTS meeting 6_27_16 100uA 300keV beam for 5 hr, but 1 mA attempts difficult. Summary of multi-alkali LN-cooled cathode work.

GTS meeting 6_20_16 Demonstrated 1 mA Beam at 275 keV!!!!

GTS meeting 6_14_16 Progress!!! Full control of laser power & first CsKSb cathode in TL1137 for the summer!

GTS meeting 5_31_16 1.6 uA 300keV DC beam on the dump!

GTS meeting 5_24_16 Struggling to keep the beam On. Some progress in diagnostics.

GTS meeting 5_17_16 The BEAM in ON!!!

GTS meeting 5_3_16 Getting ready for beam update, New puck drawings

GTS meeting 4_26_16 First multi-alkali photocathode in the GTS!

GTS meeting 4_12_16 Beamline, HV, Depo chamber, Barrel polishing surface characterization, and SCHEDULE

GTS meeting 4_5_16 Updates, and some HV.

GTS meeting 3_22_16 Updates.

GTS meeting 3_15_16 Beamline bake is done, and gun+per chamber bake is cooling down.

GTS meeting 3_8_16 Update on beamline instrumentation and bake

GTS meeting 3_2_16 Coil Procurement

GTS meeting 3_1_16 Gun magnet drawings and update on barrel polishing (Sheds) and cathode prep chamber.

GTS meeting 2_22_16 3D EM modeling of the GTS gun chamber with R30 insulator and electrode, update on prep chamber

GTS meeting 2_19_16 Discuss design tasks for Magnetized Beam LDRD

GTS meeting 2_16_16 Beamline magnets and diagnostics itemized list and LDRD gun magnet update

GTS meeting 2_9_16 Beamline and LDRD gun magnet updates

GTS meeting 2_2_16 LDRD gun magnet discussion & Shed for R30 black insulators

GTS Beamline 2_1_16 Beam line side view gun to dump with pics

GTS photos 1_29_16 Assembly of beam line and gun for LDRD

GTS meeting 1_26_16 Shed design and Beamline update

GTS meeting 1_19_16 Update: Yan's modeling with NEGs, Beamline update

GTS meeting 1_15_16 Meeting with Vashek Vylet about radiation shielding

GTS meeting 1_12_16 Update: Yan's optimized R30-shed, multi-alkali chamber work, GTS schedule drafting

GTS meeting 1_5_16 LDRD gun magnet design

2015

GTS meeting 12_15_15 optimized shed for today's gun plan Y

GTS meeting 12_8_15 status and to-do list

GTS meeting 12_1_15 status and to-do list

GTS meeting 11_13_15 present status of Plan Z (using the large FEL black insulators)

GTS meeting 11_10_15 SYSTEM R30 white + Shed & full electrode ready for High Voltage!!!.

GTS meeting 11_03_15 SYSTEM IS UNDER VACUUM!!!.

GTS meeting 10_27_15 Sheep chamber saga, electrode assembly update.

GTS meeting 10_20_15 Update on sheep chamber vacuum setup, electrodes and RadCon.

GTS meeting 10_06_15 Update on sheep chamber vacuum setup and electrode polishing.

GTS meeting 9_25_15 Update from Yan on fields from John's Shed, update on sheep chamber vacuum setup and electrode polishing.

GTS meeting 9_15_15 Met at the GTS with Danny and Josh, Sheep chamber attached to gun valve.

GTS meeting 9_8_15 350 kV vs 500 kV guns, Yan poisson field maps

GTS meeting 9_1_15 More discussion, optimized sheds and plan y and z

GTS meeting 8_25-15 More discussion re: shed optimization for gun Plan Z

GTS meeting 8_18_15 Global GTS talking points, the big picture, VA beamline etc., to do list

GTS meeting 8_11_15 More poisson results, discuss revisiting the white R30 insulator + shed test

GTS meeting 8_4_15 Yan's poisson results, Danny's latest drawing, electrode inventory, insulator inventory

GTS meeting 7_14_15 discuss gun Plan Z

GTS meeting 7_7_15 kick off and to-do list, review Carlos' HV results

To-Do Lists

GTS Improvement List - Summer / Fall 2016 Plans to improve on GTS when installing magnetized beam cathode magnet

References

• media:Carlos' HV insulator paper_IEEE published Feb 2016.pdf
• media:Desorption Paper by Diamond 2012.docx
• media:chapter_7_Microdischarges_in_UHV.pdf
• Media:NEG_particle_test_NOT_PUBLISHED.pdf
• Media:Voltage-induced gas desorption by W. Diamond.pdf See Fig. 12