Log entry time 02:19:05 on October16,2005

Entry number 157027

keyword=Spectrometer DAQ runs, part I

Spectrometer DAQ Runs. Left HRS only. I = 0.26 uA
Rates:
T1 = T2 = 0
T3 = 154 K
T4 = 129 K
T5 = T6 = 0
T7 = 57
T8 = 221 K

Run 2837 -- Check at nominal setting P0L = 3.1234 GeV
Oops ! One of the S2 PMTs was off. We turn it on now.

Run 2838 -- Same but the beam will be turned on & off with 50%
duty cycle. This helps to subtract noise and examine neutral
background.

Now we vary the beam current. Previous was I = 0.26 uA

Run 2839 -- I = 0.57 uA
T3 = 325 kHz
T4 = 277 kHz
T8 = 447 kHz

Run 2840 -- I = 0.116 uA
T3 = 63.4 kHz
T4 = 53.7 kHz
T8 = 93.6 kHz

Run 2841 -- I = 0.327 uA
T3 = 188 kHz
T4 = 160 kHz
T8 = 260 kHz

Run 2842 -- I = 0.05 uA (i.e. 50 nA)
Run 2843 -- repeat with better prescale factors

T3 = 12 kHz
T4 = 10 kHz
T8 = 23.7 kHz

Go back to "normal". I = 0.21 uA
Run 2844 (wrong PS), then 2845, short runs to check repeatability.

Observation about EPICS position data: For "low" current the
positions read zero. At 0.4 uA they are nonzero and look
like correct high-current positions 4A = (+1,6,0), 4B = (-1,4,0).
We'll run at 0.4 uA subsequently. Details:

<= 0.20 uA zeros on all EPICS positions
<= 0.26 uA zeros positions 4A,4B (but nonzero on 8,12)
At 0.33 uA BPM4A reads nonzero, BPM4B reads zero.
>= 0.40 uA all BPMS read nonzero and look correct.

 

Typical snapshot of position data

Beam Info at Sun Oct 16 02:17:24 EDT 2005

Average beam current:  hac_bcm_average               0.400789

X position at 8:     IPM1C08.XPOS                  -0.025757

Y position at 8:     IPM1C08.YPOS                  -0.150938

X position at 12:    IPM1C12.XPOS                  -0.135806

Y position at 12:    IPM1C12.YPOS                  -0.0152383

X position at 4A:    IPM1H04A.XPOS                 1.55487

Y position at 4A:    IPM1H04A.YPOS                 0.0718513

X position at 4B:    IPM1H04B.XPOS                 -1.32297

Y position at 4B:    IPM1H04B.YPOS                 0.0302609

Next we will do some dipole scanning.

User name R. Michaels

Log entry time 02:19:05 on October16,2005

Entry number 157027