Difference between revisions of "PITMinutes 11-23-2015"

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(New page: PITMinutes 11-23-2015 [edit] Attendance R. Bachimanchi, S. Cooper, M. Drury, E. Daly, A. Freyberger, R. Geng, C. Hovater, L. King, G. Krafft, F. Marhauser, C. Mounts, T. Powers, T. Plawsk...)
 
 
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PITMinutes 11-23-2015
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== Attendance ==
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[edit] Attendance
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R. Bachimanchi, S. Cooper, M. Drury, E. Daly, A. Freyberger, R. Geng, C. Hovater, L. King, G. Krafft, F. Marhauser, C. Mounts, T. Powers, T. Plawski, H. Wang, H. Zhang
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R. Bachimanchi, J. Benesch, M. Bickley, J. Creel, A. Freyberger, C. Hovater, A. Hutton, G. Krafft, C. Mounts, T. Plawski, R. Rimmer, H. Wang
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[edit] Agenda and Notes
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== Agenda and Notes ==
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Mike Drury will report in two weeks from now on He processing.
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C. Reece/R. Geng will report in two weeks on cavity contamination.
  
 
1. Operations Status and Summary
 
1. Operations Status and Summary
  
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He Processing complete! Mike Drury will report 1 month from now.
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The North Linac Helium pressure is now 0.0345 bar, updated to improve the Qs.
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Still not clear whether it helped lower the Qs.
  
 
Arne reports that preliminary assessment of Mike's data means that we should be able to run the C20s low enough that trip rates will be good.
 
Arne reports that preliminary assessment of Mike's data means that we should be able to run the C20s low enough that trip rates will be good.
  
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RF soak status? Begun in the north. Cryo problems in the south. Ops drive highs have been increased to allow large trip rates so that the trip data for the newly He processes cavities may be acquired quickly. Slight SNAFU reported during the meeting. Radiation trips were stimulated by some of the high gradient running during the meeting.
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RF soak status? Complete, gradient calibration complete.
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South Linac Status? soak is down. Optimizing c20s and c50s still need to be complete.
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Meeting 12 GeV rqs on North and close on south, but still short about 10 cavities!
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Horray!!!!!!
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2. 10 Hz Noise in Linac (Davis)
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* [http://casa.jlab.org/LINACPIT/Copy_of_1L22_survey.xlsx 10 Hz Survey]
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3. 1L22 Investigations/Findings/Cure (Mounts/Suhring/Bachimanchi)
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10 Htz in LLRF was causing iunable lock at high amplitude. Many things turned off
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LCw Zbelow and in service buildings, open and closed JT, pwer supplies.etc.
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during kirks measurement. ear on cryomodule experiment could hear effect on tuner,
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noticed some of the feet were "free. put the free foot on floor not helping. Fixed
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proble by putty knife under foot. rms LLRF fluctuation down by factor of two and
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could run full gradient. Still need more damping for high current beam loading
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in future. Installation crews are going to examine all the c100s in Jan. Have plan in place
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in case of opportunistic examination. Why 10 Hz now and not in spring still not clear.
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Rama and matalovich to come up with plan.
  
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2. Investigation team for heat and He pressure in R100 (Daly, Mounts)
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In R100 major mechanical noise source is 800 Hz.
  
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Already follow-up from two weeks ago. L. King reports pressure transducers available now at either end of linacs and near "T"s in the middle of linac at He flow split. Presently for monitoring only. Maybe eventually could be used for active feedback.
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4. Q0/Heaters Work Around (Freyberger)
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  + [[Media:ModuleQ.pdf]]
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On long term, rethink heater process/settings.
  
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3. C75 Project Summary Documentation (Krafft, Freyberger)
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5. Options for Obtaining Energy Margin (Powers)
  
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    Requirements Discussion
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6. Module up to air investigation
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    First Draft version is attached below, modeled on tables in the
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Cornell ERL "Project Definition Design Report". It contains input from Rimmer, Hutton, and Krafft but needs work on the cryomodule side. Daly and Mounts to help complete. Arne to derive cooling power requirement for charter document. Arne suggested publishing in tech note in about 6 weeks. Krafft will shepherd.
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7. C75 Project Summary Documentation (Krafft, Freyberger)
  
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    C75 Project Requirements
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* First Draft version is attached below, modeled on tables in the
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    Gradient Maintenance Document
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Cornell ERL "Project Definition Design Report". It contains input from
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    C75 Charge Document  
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Rimmer, Hutton, and Krafft but needs work on the cryomodule side. Daly
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and Mounts to help complete. Arne to derive cooling power requirement for charter
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document. Arne suggested publishing in tech note in about 6 weeks. Krafft
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will shepherd.
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* [http://casa.jlab.org/LINACPIT/C75_Project_Requirements.doc C75 Project Requirements]
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* [http://casa.jlab.org/LINACPIT/Comments_on_Gradient_Maintenance.docx Gradient Maintenance Document]
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* [http://casa.jlab.org/LINACPIT/ProjectCharter_C75.docx C75 Charge Document]
  
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4. CEBAF Beamline Vacuum (Geng)
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8. CEBAF Beamline Vacuum (Geng)
  
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    CEBAF Beamline Vacuum
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* [http://casa.jlab.org/LINACPIT/CEBAF_Beamline_Vacuum.pptx CEBAF Beamline Vacuum]
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    Field Emission Mitigation Project Charter  
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* [http://casa.jlab.org/LINACPIT/Project_Charter_CEBAF_field_emission.docx Field Emission Mitigation Project Charter]
  
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[edit] Action Items
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== Action Items ==
  
 
Complete Project Charter Document; Project Leader (Freyberg, Rimmer, Krafft, Hutton)
 
Complete Project Charter Document; Project Leader (Freyberg, Rimmer, Krafft, Hutton)

Latest revision as of 15:29, 23 November 2015

Attendance

R. Bachimanchi, J. Benesch, M. Bickley, J. Creel, A. Freyberger, C. Hovater, A. Hutton, G. Krafft, C. Mounts, T. Plawski, R. Rimmer, H. Wang

Agenda and Notes

Mike Drury will report in two weeks from now on He processing. C. Reece/R. Geng will report in two weeks on cavity contamination.

1. Operations Status and Summary

The North Linac Helium pressure is now 0.0345 bar, updated to improve the Qs. Still not clear whether it helped lower the Qs.

Arne reports that preliminary assessment of Mike's data means that we should be able to run the C20s low enough that trip rates will be good.

RF soak status? Complete, gradient calibration complete. South Linac Status? soak is down. Optimizing c20s and c50s still need to be complete. Meeting 12 GeV rqs on North and close on south, but still short about 10 cavities! Horray!!!!!!

2. 10 Hz Noise in Linac (Davis)

3. 1L22 Investigations/Findings/Cure (Mounts/Suhring/Bachimanchi)

10 Htz in LLRF was causing iunable lock at high amplitude. Many things turned off LCw Zbelow and in service buildings, open and closed JT, pwer supplies.etc. during kirks measurement. ear on cryomodule experiment could hear effect on tuner, noticed some of the feet were "free. put the free foot on floor not helping. Fixed proble by putty knife under foot. rms LLRF fluctuation down by factor of two and could run full gradient. Still need more damping for high current beam loading in future. Installation crews are going to examine all the c100s in Jan. Have plan in place in case of opportunistic examination. Why 10 Hz now and not in spring still not clear. Rama and matalovich to come up with plan.

In R100 major mechanical noise source is 800 Hz.

4. Q0/Heaters Work Around (Freyberger) 

  + Media:ModuleQ.pdf

On long term, rethink heater process/settings.

5. Options for Obtaining Energy Margin (Powers)

6. Module up to air investigation

7. C75 Project Summary Documentation (Krafft, Freyberger)

  • First Draft version is attached below, modeled on tables in the

Cornell ERL "Project Definition Design Report". It contains input from Rimmer, Hutton, and Krafft but needs work on the cryomodule side. Daly and Mounts to help complete. Arne to derive cooling power requirement for charter document. Arne suggested publishing in tech note in about 6 weeks. Krafft will shepherd.

8. CEBAF Beamline Vacuum (Geng)

Action Items

Complete Project Charter Document; Project Leader (Freyberg, Rimmer, Krafft, Hutton)

Data mining for field emission (Geng)

C75 parameter table! (krafft, rimmer, marhauser)

Heat For Project Charter (freyberger)

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