Difference between revisions of "PITMinutes 06-18-2018"

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(New page: == Attendance == R. Bachimanchi, K. Baggett, M. Drury, A. Freyberger, R. Geng, A. Hutton, G. Krafft, A. Kimber, R. Legg, C. Mounts, R. Nelson, T. Plawski, T. Powers, C. Reece, T. Reilly, ...)
 
(→‎Attendance)
 
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== Attendance ==
 
== Attendance ==
  
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R. Bachimanchi, K. Baggett, M. Drury, A. Freyberger, R. Geng, A. Hutton, G. Krafft, A. Kimber, R. Legg, C. Mounts, R. Nelson, T. Plawski, T. Powers, C. Reece, T. Reilly, R. Rimmer, and A. Solopova.
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R. Bachimanchi, K. Baggett, M. Drury, A. Freyberger, R. Geng, C. Hovater, G. Krafft, A. Kimber, R. Legg, C. Mounts, R. Nelson, T. Plawski, T. Powers, C. Reece, T. Reilly, and A. Solopova.
  
 
== Agenda and Notes ==
 
== Agenda and Notes ==
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1. Operations Status and Summary/Review (Freyberger)
 
1. Operations Status and Summary/Review (Freyberger)
  
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High average current limits remain. Usually A runs 22.5 muA
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During SAD two FEL modules being moved into
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and C runs 50-60 muA. Seems more and more solid that the Hall
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NL07 and NL23 (a C100 is being removed). This first
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C current limit is 70-75 muA, independent of the Hall A current.
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C100 cryomodule will be used as a feeder for the C100
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And the main trips are from beam loss. So focus is shifting
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refurbishment program. More on this below.
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back to injector. Today, bunch length measurements are being
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made for the different Hall bunches. Recent work points
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to longitudinal phase space tails causing high
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average current trips. Is there a better diagnostic for these?
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Anna will be working on getting a handle on OPS-initiated
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Current limits from previous minutes largely
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reductions in the C100 cavity gradients. First try to understand
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solved, if not completely understood, by injector
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why people are reducing them and work through mitigations.
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tuning elliminating beam haloes. Bunch length
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changes were effective in mitigating problem.
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Process Reza used could be incompatible with
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high quality parity measurements.
  
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2. Magnetic Flux Cenerated by Thermal Currents (Geng)
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Some questions about HOM loads as installed in CEBAF.
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P1 FEL configuration for all cavities after installation
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back in CEBAF.
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2. Magnetic Flux Generated by Thermal Currents (Geng)
  
 
[https://casa.jlab.org/LINACPIT/JLAB-TN-18-003_Thermal_current_generated_magnetic_flux_in_CEBAF_cavities.pdf JLAB-TN-18-003]
 
[https://casa.jlab.org/LINACPIT/JLAB-TN-18-003_Thermal_current_generated_magnetic_flux_in_CEBAF_cavities.pdf JLAB-TN-18-003]
  
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3. C100 Quenches (Powers)
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3. C100 Refurbishment Planning (Krafft, Reilly)
  
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[https://casa.jlab.org/wiki/images/b/b8/PIT_meeting_7May2018_RF_Trips.pptx Yet another version of Tom's presentation]
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[https://casa.jlab.org/wiki/images/1/15/C100_System_improvement_Discussions_LRPIT_7MAY2018.pptx C100 System Improvement Discussion]
  
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[https://casa.jlab.org/wiki/index.php/Image:26Apr_Quench_and_example_of_SEL_CRFP_errors_driving_microphonics_v2.docx A brief analysis of some of the data collected with the RF waveform harvester]
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[https://casa.jlab.org/LINACPIT/Brainstorming_on_C100_Refurbishment.eml Items Request Email]
  
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[https://casa.jlab.org/LINACPIT/26Apr_Quench_and_example_of_SEL.docx Measurement regarding C100 Quenches]
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[https://casa.jlab.org/LINACPIT/C100_Refurbishment_Brainstorming_List.pptx C100 Refurbishment Brainstorming List]
  
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4. C100 Refurbishment Planning (Freyberger)
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[https://casa.jlab.org/LINACPIT/C100_System_improvement_Discussions_18JUNE2018.pptx Tony's C100 Refurbishment Brainstorming ppt]
  
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[https://casa.jlab.org/wiki/images/1/15/C100_System_improvement_Discussions_LRPIT_7MAY2018.pptx C100 System Improvement Discussion]
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4. NEGS for C75? (Ciovati, Reilly)
  
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[https://casa.jlab.org/LINACPIT/Brainstorming_on_C100_Refurbishment.eml Items Request Email]
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[https://casa.jlab.org/LINACPIT/1L13_WGfaults_112617-050618.JPG Waveguide Faults Summary]
  
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[https://casa.jlab.org/LINACPIT/C100_Refurbishment_Brainstorming_List.pptx C100 Refurbishment Brainstorming List]
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Answer to question: Yes!
  
 
== Action Items ==
 
== Action Items ==

Latest revision as of 14:39, 18 June 2018

Attendance

R. Bachimanchi, K. Baggett, M. Drury, A. Freyberger, R. Geng, C. Hovater, G. Krafft, A. Kimber, R. Legg, C. Mounts, R. Nelson, T. Plawski, T. Powers, C. Reece, T. Reilly, and A. Solopova.

Agenda and Notes

1. Operations Status and Summary/Review (Freyberger)

During SAD two FEL modules being moved into NL07 and NL23 (a C100 is being removed). This first C100 cryomodule will be used as a feeder for the C100 refurbishment program. More on this below.

Current limits from previous minutes largely solved, if not completely understood, by injector tuning elliminating beam haloes. Bunch length changes were effective in mitigating problem. Process Reza used could be incompatible with high quality parity measurements.

Some questions about HOM loads as installed in CEBAF. P1 FEL configuration for all cavities after installation back in CEBAF.

2. Magnetic Flux Generated by Thermal Currents (Geng)

JLAB-TN-18-003

3. C100 Refurbishment Planning (Krafft, Reilly)

C100 System Improvement Discussion

Items Request Email

C100 Refurbishment Brainstorming List

Tony's C100 Refurbishment Brainstorming ppt

4. NEGS for C75? (Ciovati, Reilly)

Waveguide Faults Summary

Answer to question: Yes!

Action Items

Leadership of quenches. Offline discussion.

Complete C75 Module Specifications (Marhauser, Benesch, Krafft)

C100 Refurbishment Project for the future?

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