No chambers are all fine except L21 seems to have a resistive short between
one of the sense wires and one of the guard wires which causes a negative
current on the guard wire and which then causes the HV to shutdown.
Because of this we running L21 at 3700.
--On Friday, August 29, 2003 4:06 PM -0400 Frederick Tong-Uk Lee
<tong@lns.mit.edu> wrote:
> Hi Doug,
>
> I am still at Jlab and planning to go back to UNH next week.
> I was wondering if the chamber is OK with this hot humid weather at
> Bates. Do you see any high dark currents?
> We had to stop Hall-B experiment because of humidity inside the chamber.
>
> -T
>
>
> On Fri, 2003-08-29 at 10:03, Douglas Hasell wrote:
>> I noticed in the recent shift reports that people have turned L6 down
>> and left it down. L6 is the most forward cells on the inner left
>> chamber and as such charges the most quickly. This is also the region
>> with the highest physics rate. So turning it off really affects the
>> data.
>>
>> L6 recovers after a while and can hold voltage. The procedure should be
>> to turn it down or off for a while and then try to bring it back up.
>> Tripping once or twice a fill is acceptable. Leaving it off for an
>> entire shift is not.
>>
>> Cheers,
>> Douglas
>>
>> 26-415 M.I.T. Tel: +1 617 258 7199
>> 77 Massachusetts Avenue Fax: +1 617 258 5440
>> Cambridge, MA 02139, USA E-mail: hasell@mit.edu
> --
> Frederick Tong-Uk Lee Senior Research
> Associate
> Laboratory of Nuclear Science at MIT tong@lns.mit.edu
> 26-402 tel: (617) 258-5437
> 77 Massachusetts fax: (617) 258-5440
> Cambridge, MA 02139
>
>
Cheers,
Douglas
26-415 M.I.T. Tel: +1 617 258 7199
77 Massachusetts Avenue Fax: +1 617 258 5440
Cambridge, MA 02139, USA E-mail: hasell@mit.edu
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