keyword=Owl shift summary

00:00 Start owl shift. Continue taking data for kin(135,180).

Beam current 93uA.

02:58 Beam tripped because of the RF problem in north linac.

03:30 MCC told us they have some HV problem and the on-call person

is on the way. It may take one hour to fix that problem.

04:30 The target coolan pressure is fluctuating and increasing to the

set HIGH limit.

See halog 43999.

05:15 Beam back to Hall A. Ask for 50 uA beam current to avoid the overpressure of the coolant.

Tried to increase the coolant back to its original flow rate, its pressure

also went up. Since the target oncall doesn't know how to get rid

of this coolant pressure problem and MCC can't solve this probelm for us either,

we just keep data taking at a lower beam current (50uA) so that the coolant flow can

be set to 30 and the coolant pressure is not increasing any more. The experts should

be called to check this problem during the day.

06:57 Open the JT valve to 33, its pressure looks stable now (54.6). Ask MCC

to increase current to 60uA.

07:45 Ask MCC to increase current to 70uA since the coolant pressure is stable

at this flow rate.

Time Run Events Comment

23:47 2153 1.3M 93uA

00:04 2154 1.3M

00:21 2155 1.3M

00:39 2156 1.3M

00:57 2157 1.3M

01:12 2158 1.3M

01:32 2159 1.3M

01:50 2160 1.3M

02:08 2161 1.3M

02:25 2162 1.3M 90uA

02:43 2163 0.5M RF problem in north linac

05:15 2164 1.3M I_beam=50uA

05:57 2165 1.3M 50uA

06:39 2166 1.3M Beam current is increased to 60uA at 6:57.

07:08 2167 1.3M 60uA, at 7:45 increased to 70uA

07:47 2068