[Hallb-engineering] [Esr-users] [Revised Logentry] Follow-up Re: Controlled Ramp on VCL Flow

Jessie Butler jbutler at jlab.org
Mon Jan 22 10:10:40 EST 2018

Hi Dave,

Just to be clear, Hall A magnets (LQ2, LD1, LQ3 & RD1) trip were also a victim here. Hall A magnets dump in response to the change in cryogenic system pressure (presumably caused by the Hall C target warmup). We are still examining archive data but there were no changes taking place in Hall A at the time of the trip. As far as I can tell, the issue was not caused by Hall A but please advise if you have information showing otherwise. 


Jessie Butler 
Jefferson Lab 
Physics/Hall-A Work Coordinator 


----- Original Message -----
From: kashy at jlab.org
To: "Raffaella De Vita" <devita at jlab.org>, sandoval at jlab.org, hallb-engineering at jlab.org, esr-users at jlab.org
Sent: Monday, January 22, 2018 9:35:02 AM
Subject: [Esr-users] [Revised Logentry] Follow-up Re: Controlled Ramp on VCL	Flow

Follow-up Re: Controlled Ramp on VCL Flow 

Lognumber 3518798 . Submitted by kashy on Mon, 01/22/2018 - 00:13. 

Last updated on Mon, 01/22/2018 - 09:32 Logbooks: 	HALOG HBLOG HBSOLENOID HCLOG CLOG 
Entry Makers: 	kashy 
References: 	3518790 - Controlled Ramp on VCL Flow 

There were two events that effected our solenoid. 
1) the Hall A Q2 tripped and ramped down at 22:53 
This caused a large flow increase in the warm return line and thus temporary pressure increase. 
The solenoid lead flow bumped but it recovered. 

2) The Hall C TARGET started to warm 

It looked like it went down first then went up. This may or may not have effected the Solenoid. 
At present all looks OK to continue the run 

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