Chi,
I am not sure if this makes a difference, but I think the state of the
accelerator changed quite a bit last night. Dave retuned the linac and
really improved the injection efficiency markedly (at least a factor 2).
We know large injection losses aren't good for various systems: WC, cell
wall etc. We (Dan and Brian) are preparing an EPICS injection efficiency
monitor i.e. a measure of the integrated charge through the injection
line/charge stored in the ring. It might be useful to try to correlate
this number with the target performance, wc trip rates etc......
I was amazed at how quietly the chambers ran. I think I had only one
trip all last night!
TZ
Chi Zhang wrote:
> Hi
>
> todays data, 10377-10384 10386-10389 10391 look much better than last two
> days, in parrallel kinematics, Non-zero asymmetries are established
> even with the little statistics accumulated so far:
>
> Q2 A(today) 1.7kC A(22nd-23rd) 6.6kC
> 0.15 -0.11+-0.07 -0.009+-0.032
> 0.20 -0.27+-0.15 -0.064+-0.059
>
> Pzz today looks nice at arround 0.70+-0.16.
>
> Chi
>
> On Wed, 25 Aug 2004, Townsend Zwart wrote:
>
>
>>Brian,
>>It would be useful to dig up the history of the current and voltage of
>>the holding fields (long + trans) over the last two days. Thanks,
>>
>> TZ
>>
>>Chi Zhang wrote:
>>
>>
>>>Hi, Just for record.
>>>
>>>in the last two days of D2 running, spin angle seemed to have drifted
>>>to below 30 degrees. in fact could be very close to 20 degrees judging
>>
>>>from ed elastic asymmetries. the sympton is that asymmetries in Parallel
>>
>>>kinematics almost vanish.
>>>
>>>I am afraid this is less than optimal for Pzz measurement, T20 and maybe
>>>Gen.
>>>
>>>To Shift takers: when running ed_xs.C, you can specify the spin angle by:
>>>root ed_xs.C #### #### spinthd=<value>. theory curves for 20, 30, 32, 35,
>>>37, 40, 45, 47, 48, 50 degrees are built in.
>>>
>>>Chi
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
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