Double-speed Target / Beam Bump Test - 6th April 2014¶The purpose of the run is
- to demonstrate, to ISIS' satisfaction, interoperation between the MICE target running at MS/64 and 4V beamloss and the ISIS beam. This may require tuning of the ISIS beam-bump settings, hence need for ISIS Machine Physics attendance. (This is the postponed activity from 2nd February 2014; draft original run plan attached)
|estimated time||4 - 6pm||4pm - 1am|
|MOM||A Dobbs||A Dobbs|
|Lead shifter||P. Hanlet||n/a|
|Shifter||n/a||YK / EO|
|BLOC||H Nebrensky||H Nebrensky|
|Experimenter||n/a|| Ed Overton (Target)
Y Karadzhov (DAQ)
|Aim||Check beamline, Close Hall||Take Data|
|Additional Personnel||ISIS Machine Physics (D Adams)|
If necessary, YK and EO will act as shifter during the other's activity (except that neither is on the trained shifter list!)
Shifter hours of service:¶
- 16:00 - search and lock Hall
- Shifter - arrive 19:00 - finish 1am
N.B. Decay Solenoid will not be available.
N.B. Proton Absorber hasn't been tested since re-installation in January, so "at risk".
We expect to be running with 4V beamloss and beam bump active.
Propose to use a +ve pion reference run for primary studies.
A comparison proton beam might be interesting if there is time and Henry can locate the proton MMS.
Reference Run without Decay Solenoid (or Proton Absorber)¶
|Particle Species||p at Tgt||p@D1||p@D2||p@Tof0||Proton Absorber||Q1||Q2||Q3||D1||DS||D2||Q4||Q5||Q6||Q7||Q8||Q9||Ran?||Similar Run(s)|
|MeV/c||MeV/c||MeV/c||MeV/c||mm||A||A||A||A||A||A||A||A||A||A||A||A||DAQ run #|
We will run to TOF1 so need to fully secure the MICE Hall. Placing fencing, signage, and Search & Secure – 2 hrs.
- Work through the target check list and get the target operational with the target frame raised. – 30 mins
- Run target in ISIS at MS/128 for reference - 30 mins
- ISIS double Machine Start frequency - 10 mins
- Check that the target’s insertion aligns with the correct ISIS spill. The target will be operating at the double dip rate. – 10 mins
- Stop operating the target and lower the target frame. Ensure that the target insertion depth is small. (Large BCD) – 10 mins
- With the beam bump on steadily increase the insertion depth (reduce BCD) until we obtain the required 4 V beamloss. – 1 to 2 hours depending The aim here is to ascertain whether we/ISIS observe any scraping of the ISIS beam during insertion or on the next injection cycle. If there is any evidence of beam scraping then this needs to be mitigated by either altering the target’s parameters or by suitable adjustment of the beam bump. This step will require close cooperation with the ISIS expert. The target parameters that could be altered are the timing of the target’s insertion and possibly its operating voltage.
- Once we have a stable configuration for running at the double rate then we can run for twenty minutes to half an hour to obtain some operational data. – 30 mins
Estimated Time ~2.5 -3.5 hours for Target related activity
- Use the time spent on optimization of the target insertion depth for tests and debugging of the new trigger system - 2 hours.
- Once we have a stable configuration for running the target, switch back to the default configuration of the trigger and take data at the double rate - 30 min.
- Shutdown target and re-open Hall for Monday