Log entry time 09:42:52 on May 22, 2004

Entry number 122395

Followups:

• 122464 05/23/04 09:02 Olivier May 23 shift plan

 E04-012 Shift Plan: Saturday, May 22, 8:00 am - Sunday, May 23, 12:00 am

Program: 

Beamline check run plan

     LEFT:    p0 = 2.490 GeV/c    (+ polarity)         RIGHT:    p0 = 2.500 GeV/c     (- polarity)

                    septum:  0.0 A                                                        septum:  0.0 

Move to BeO target, and ask for 5muA, centered on (O,O) on BPM A and B (+/- 0.1), raster OFF: check beam on viewer: beam should be centered on the camera. MCC should be able to see the beam on the dump viewer.

• Perform Harp Scan (including a CODA run while doing the scan). Profile: 100 micron x 100 micron.
  
• Ask MCC to insert Hall A ARC OTR and check it. (sigma_x < 0.24mm)
• Move to empty target and notify MCC you are going to ramp up septum magnets.
• Ramp up septum magnets:

• Ask MCC to check the beam dump viewer, and tune acordingly (beam will be steered by the fields in the septa, so tuning might be necessary so that it hits the beam dump). Write down the BPM A and B x and y positions on the white board (expected: BPMA (x,y) ~ (+ 2,0), BPMB (x,y) ~ (-2,0)).
• Perform another Harp Scan.
• Move to empty target.
• MCC takes beam for ~2-3 hours for RF balancing (100 muA will be sent to the beam dump).
  
• Perform another harp scan.
  
• Move to BeO target.
  
• Turn raster ON, and determine the settings to get raster 2mm x 2mm.
  
• Fast feedback should be ON.
• Move to 15cm LH2 target.
• Turn loop fan on to 60%
• Ask MCC to increase current by steps, up to 25 muA, so that you can adjust the cooling power on the target (~ 150 Watts for 25 muA).

• Prescalers:    Set the prescale factors according to these rules:

•   Target: 15 cm LH2

• Move target to 4 cm LH2
•  Target: 4 cm LH2

                        50 muA, GOAL -> 3 hours ABU

Scheduled events/Special tasks:

• In the middle of the beamline check, the beam will be taken by MCC for RF balancing. This is to redistribute power to the cavities, to be able to run 100muA with 5 pass, which is  a large load on the machine. 100muA will be sent to the Hall A beam dump at that time, our target should be in the 'empty' position.
  
• As in Hyper Nuclear experiment, the fields in the septum magnets will steer the beam away from the beam dump. So MCC needs to correct for that. Procedure: start tuning with septa off. MCC should see the beam on the dump viewer. Then ramp up both septa, ask MCC to retune until they see the beam in the viewer. This affects the beam position on the target: it will come at an angle (horizontal). Write down the BPM A and B values that we should monitor (it was +2 in BPMAx and -2 in BPMBx, which had a similar effect).
  

General Tasks:

• When recording settings, check whether they are correct; don't just copy them.
• For each run do detector replay and compare with reference plots.
• After end of run do full physics replay from the ana directory.
• HALOG any detector, DAQ trip and unusual observation when they happen.
• Do shift checklist.
• Twice a shift HALOG control screens and septum & energy spread strip charts.
• For STANDBY shifts, please HALOG the control screens and magnet strip charts.
• If septa Tcoil >= 7.5 K, HALOG with TECH in title; only 8:00 am - 5:00 pm also call Ed Folts.
• Any problem that prevents data taking and that you cannot solve within 30 min page the Run-Coordinator.
• During night and weekend shifts contact Tech on-call only for emergencies (in doubt page RC). HALOG all events that will require TECH assistance with the word "TECH" in the title.

Known Problems

• N2 level reading right Q3  (CLL72Q310) is  not working properly; ignore