[Dlsupport] task list 06/28/2016

[David Douglas]

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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