[Dlsupport] task list 06/28/2016

[Stephen Benson]

Just for information sake, the skew quads are rotated 45 degrees counterclockwise from their normal quad orientation.

Steve

On Jul 6, 2016, at 8:49 PM, David Douglas <douglas at jlab.org> wrote:

> oops... one other remark: in principle, the "parity" will be defined by the rotation angle of the skew quad, which is either       +45 degrees or -45 degrees, looking either up-beam or down-beam... which translates into either positive or negative skew quad when a positive (horizontally focusing) normal quad is rotated.
> 
> So, there are only 8 possible combinations for any particular code... ;)
> 
> 
> 
> On 7/6/2016 10:59 AM, Michele Joyce wrote:
>> Should this info be kept and maintained in the LED?
>> Michele
>> 
>> On 7/5/2016 12:26 PM, David Douglas wrote:
>>> Thanks Jim.
>>> 
>>> Part of the need for the polarity check is to establish the "parity" of the skews (which differs between EPICS and codes). I don't want to introduce bias, but if we could measure the poletip field (with sign) of each quad and log it, we'll save time overall. I'll sketch up a procedure.
>>> 
>>> Thanks
>>> 
>>> D
>>> 
>>> 
>>> On 7/5/2016 11:00 AM, Jim Coleman wrote:
>>>> Hi Dave,
>>>>  We haven't powered any of the 4F quads yet.  That will not happen until the spool pieces are installed due to splitting of the magnet. We have to perform a voltage/ current/ polarity measurement of any magnet as part of the HCO.  I'll make sure LCW gets put on the skews.
>>>> -Jim
>>>> 
>>>>  On 7/5/2016 10:08 AM, David Douglas wrote:
>>>>> re: #2) - please put the results of the test into the LERFLog. Thanks
>>>>> 
>>>>> D
>>>>> 
>>>>> On 7/5/2016 10:07 AM, David Douglas wrote:
>>>>>> Hi Jim - don't know if the following was communicated to you or not, but
>>>>>> 
>>>>>> 1) Steve asked if the 10 additional skew quads needed water cooling. Answer: if the other quads are run with                 water cooling, these will need it as well. They run at the same fields as the normal quads.
>>>>>> 
>>>>>> 2) Has each quad been polarity checked (i.e. a Hall probe put on each pole of each quad)? We need to be sure there are consistent sign conventions through 4F, and I'll need to know what pole of each quad is at what sign and field level when the usual +5A test current is being run.
>>>>>> 
>>>>>> Thanks,
>>>>>> DD
>>>>>> 
>>>>>> 
>>>>>> On 6/30/2016 4:32 PM, Jim Coleman wrote:
>>>>>>> apologies for sending it out late 
>>>>>>> 
>>>>>>> 
>>>>>>> 
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>>>>>> 
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>>> 
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