Difference between revisions of "PITMinutes 03-11-2019"

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(Agenda and Notes)
 
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== Attendance ==
 
== Attendance ==
  
R. Bachimanchi, K. Baggett, A. Freyberger, R. Geng, C. Hotaver, G. Krafft, A. Kimber, R. Legg, C. Mounts, R. Nelson, T. Plawski, T. Powers, C. Reece, S. Suhring, and H. Wang.
+
A. Freyberger, R. Geng, C. Hotaver, G. Krafft, A. Kimber, R. Legg, F. Marhauser, R. Michaud, R. Nelson, T. Plawski, T. Powers, B. Rimmer, C. Reece, T. Reilly, A. Solopova, and H. Wang.
  
 
== Agenda and Notes ==
 
== Agenda and Notes ==
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1. Operations Status and Summary/Review (Freyberger)
 
1. Operations Status and Summary/Review (Freyberger)
  
Notble event during OPS last week. Net result is gradients in two modules
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Notable event during OPS last week. Net result is gradients in two modules
 
turned back to below onset of FE. Question to be discussed is whether
 
turned back to below onset of FE. Question to be discussed is whether
all should get similar treatment.
+
all should get similar treatment? More neutron detectors ordered.
 +
Do measurements during the summer?
  
  
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Mount/Pwers observed many quench faults in 1L25-8 that are not quenches but are ????
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Mounts/Powers observed many quench faults in 1L25-8 that are not quenches but are ????
 +
 
 +
1L25 and 1L26 thermal cycled to 30 K in Jan. Modest Help?
  
1L25 and 1L26 themal cycled to 30 K in Jan. Modest Help?
 
  
 
Event Description
 
Event Description
 
  
 
Vaccum degrades
 
Vaccum degrades
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 +
Recovery
 +
 +
Neutron detectors used to find new 1L25 and 1L26 gradients
 +
 +
20+ MeV energy loss in 1L25
 +
 +
8 MeV energy loss in 1L26
 +
 +
Warm region vacuum almost back to nominal
  
  
  
Some startup problems have occurred. NL20 had enormous
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Scaled back to 1000 in the NLINAC,
heat load even with only single cavity operating. The module
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1020 in the SLINAC
will be thermal cycled and is being He processed. NL20 cavity
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one looks to be trashed. No valve between ion pump and cavity.
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Suspect pump sputtered when turned on at too high vacuum and
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junk now in cavity. SRF ops procedure needs to be modified
+
as similar occurrences have occurred in the past.
+
  
NL07 also being worked on to recover performance. Looks promising.
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New neutron detectors placed below both 1L25 and 1L26
Some isolated cavities are generating vacuum trips and may
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Tune gradient to no neutrons detected.
need to be de-rated.
+
  
Overall goal for near term running is 1040-1060/linac
 
  
Many circulator loads failed. Started in injector and then in
 
NLINAC after it started operating. Nothing in the SLINAC yet.
 
Suspect the common LWC system. Could also
 
be old age as the North is older. Troubling rate. Arne pled
 
for focused investigation/answer.
 
  
Out of 30 kW klystron spares (for C100 cavities). Two new units
+
2. Cryomodule Shuffle ????
on order and 3 will be sent out to be rebuilt.
+
  
2. Plasma Cleaning (Powers)
+
3. Plasma Cleaning (Powers)
  
 
Funding approved
 
Funding approved

Latest revision as of 16:41, 25 March 2019

Attendance

A. Freyberger, R. Geng, C. Hotaver, G. Krafft, A. Kimber, R. Legg, F. Marhauser, R. Michaud, R. Nelson, T. Plawski, T. Powers, B. Rimmer, C. Reece, T. Reilly, A. Solopova, and H. Wang.

Agenda and Notes

1. Operations Status and Summary/Review (Freyberger)

Notable event during OPS last week. Net result is gradients in two modules turned back to below onset of FE. Question to be discussed is whether all should get similar treatment? More neutron detectors ordered. Do measurements during the summer?


Pre-cursors


Mounts/Powers observed many quench faults in 1L25-8 that are not quenches but are ????

1L25 and 1L26 thermal cycled to 30 K in Jan. Modest Help?


Event Description

Vaccum degrades

1L25-8 becomes Unstable

valve fails

1L25-8 by-passed not recoverable

gradient loss in 1L25-7


Recovery

Neutron detectors used to find new 1L25 and 1L26 gradients

20+ MeV energy loss in 1L25

8 MeV energy loss in 1L26

Warm region vacuum almost back to nominal


Scaled back to 1000 in the NLINAC, 1020 in the SLINAC

New neutron detectors placed below both 1L25 and 1L26 Tune gradient to no neutrons detected.


2. Cryomodule Shuffle ????

3. Plasma Cleaning (Powers)

Funding approved

Action Items

Leadership of quenches. Offline discussion.

C100 Refurbishment Project for the future?