Hello there,
There is bad news. The test.sh had been running all night until I came
here. So the spin bits from run # 15315 to 15334 should not make sense
unless one can artificially interprets the states in the data. I think
test.sh is overriding the spin bits which ABS had written. Run # 15334
stopped prematurely because of this. test.sh is no longer running from
run # 15335. I should have explicitly said to the shift taker but I did
not and I am so sorry.... :-(
Regards,
aki
Akihisa Shinozaki wrote:
> Hello,
>
> I will run the Tylan's script from run 15313. I am currently power
> cycling the HV crate and the script is running ok.
>
> Thank you,
> aki
>
>
> Taylan Akdogan wrote:
>
>> Hi,
>>
>>
>> This is fine until we have the ABS software. As Michael noted;
>> for the false asymmetry extraction, we prefer to have -exactly-
>> the same operating conditions.
>>
>> I have two remarks about the script:
>>
>> 1) Although, you set the target state to 0 while changing the
>> bits, this will have no effect in practice. CA (epics
>> channel access) library is a highly optimized - good design -,
>> and it will most likely deliver the commands in the right order
>> but at the same time (same epics update interval) to the
>> ABS.STATUS channel. Thus, the change in status will be done
>> instantly on all bits for all practical purposes, without
>> any status-0 target.
>>
>> To mimic the ABS operation (I assume this should be the aim),
>> put a delay after setting the status bit to 0. Is is something
>> like 5 sec? (attached the changed script)
>>
>> 2) Isn't the ABS transition sequence quasi-random? If so,
>> same algorithm is desirable for this script, rather than
>> linear change sequence.
>>
>> Taylan
>>
>>
>>
>> On Apr 16, 2005, at 3:57 PM, Akihisa Shinozaki wrote:
>>
>>> Hello there,
>>>
>>> I made a simple shell script to flip the spin bits. I have not run
>>> the script on one of the dblast machines because I do not want to
>>> screw things up. It flips the bits every 10 minutes. Every 10
>>> minutes, the script flips from state 1,6> to 2,5> or 2,5> to 3,4>
>>> or 4,5> to 1,6>. During the flip, the target status bit (6) is set
>>> to 0. I think I need someones approval before I run this thing.
>>> What do you think?
>>>
>>> Thank you so much,
>>> aki
>>>
>>> Taylan Akdogan wrote:
>>>
>>>
>>>>
>>>> On Sat, 16 Apr 2005, Michael Kohl wrote:
>>>>
>>>>
>>>>>> - Had to change the ABS states manually, because ABS software
>>>>>> was not running.
>>>>>>
>>>>>>
>>>>>>
>>>>> Just as a comment,
>>>>>
>>>>> if we want any confidence on false asymmetries measured with the
>>>>> unpolarized system, we need to run the experiment in the same way
>>>>> like with the ABS, i.e. with the ABS software (even if the ABS
>>>>> software only uses the commands to set the spin bits that Taylan
>>>>> invoked manually).
>>>>>
>>>>> Otherwise, the unpolarized running is only good for the
>>>>> luminosity check.
>>>>>
>>>>> Regards,
>>>>>
>>>>> Michael
>>>>>
>>>>>
>>>>
>>>>
>>>> I agree. I should have been more informative about this in the
>>>> shift summary: Because of the SFT problem, Genya didn't want to
>>>> turn on ABS RF, so didn't want to run the ABS software. (elog 34974)
>>>>
>>>> I'm sure, we can/will use the ABS software for future unpol runs
>>>> as was used in the past, once it's fixed.
>>>>
>>>> Taylan
>>>>
>>>> --
>>>> ---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=---
>>>> Taylan Akdogan Massachusetts Institute of Technology
>>>> akdogan@mit.edu Department of Physics
>>>> Tel: +1 (617) 258-0801 Laboratory for Nuclear Science
>>>> Fax: +1 (617) 258-5440 Room 26-559
>>>> ---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=---
>>>>
>>>>
>>>>
>>>> <test.sh>
>>>
>>>
>>>
>>
This archive was generated by hypermail 2.1.2 : Mon Feb 24 2014 - 14:07:32 EST