What to Watch in the Beamline When You Are on Shift

This is a list of what, pertaining to the beamline, you should watch when you are on shift.   A brief explanation of each device, what to look for, and how to respond, is given.   Also included, at the end of this document, are an explanation of why we are running the way we are, and some other interesting devices to look at.

This document will change!   We are currently running at about 4E16 protons per hour.   We want to run in excess of 8E16 protons per hour.   As we increase intensity, rep-rate, make changes to the Booster and our beamline, the devices to monitor will change.   This page will keep you up-to-date.

If you are not sure how to start an application or use ACNET, refer to the Guide to the MiniBooNE Beamline or ask an expert.

  1. How to Set Up the Console
  2. Things to Watch All The Time
    1. Target Position
      1. via ACNET
      2. BullsEye Plot
    2. Beam Monitoring Fast Time Plot
    3. B88 (BLM/Trip Point)
  3. Every 2 Hours
    1. From a Parameter Page
    2. From Lumberjack
  4. Every Shift
    1. Shift Summary Plot
    2. Shift Summary Form
  5. Daily Summary
    1. Air Activation Plot
    2. Water Level Plot
  6. Once A Week
    1. Beam Permit System Checklist
  7. Details About How We Run

How to Set Up the Console

Bring up parameter page E25[XXXXXX]<1>. On the second line, you will see "ACL>>'MB_SHIFT_SETUP'. This is an ACL script. Place your cursor on the line, after the text, and click. This will bring up all the standard ACNET displays.

Things to Watch All The Time

Target Position

via ACNET

The target multiwire is longer working, therefore, we must rely on two pair of BPM, located before the target, to give us positon and angle information. The following image shows typical variations in the horizontal and vertical positions.
beamposition
If you do not see this, then follow the proceedure for starting a fast time plot, and choose plot number 22 ("Stay on target (supercycle)").

Note that the time appears in the upper right hand corner. If this time is not updating, restart the display.

E:HPTGTS
Located just upstream of the target.
Nominal position is 2.5+/-0.5 mm.
E:HP875S
Located a couple meters upstream of the target.
Nominal position is 2.5+/-0.5 mm.
E:VP875S
Located a couple meters upstream of the target.
Nominal position is 1.0+/-0.5 mm.
E:VPTGTLS
Located just upstream of the target.
Nomianl position is 1.0+/-0.5 mm.

The "S" appended to the end of the device name indicates that this a the average position for the most recent supercyle. Note that AutoTune also uses a supercycle average.

BullsEye Plot

The beam may also be monitored using the Bulls Eye Plot. Follow the link for a complete explanation.

Beam Monitoring Fast Time Plot

Here is a typical display:
beam summary
If you do not see this, then follow the proceedure for starting a fast time plot, and choose plot number 1 ("Beam Monitor").

E:THCURR
should be 170 kA and flat. Whenever there is beam, this should be on.
E:TR875L
is the beam intensity, in protons per pulse (time 10^12), on our target. The value varies depending on how we are operating. It should be between 2.5 and 5.5 E12 when we are running.
If it drops below 2.5E12, call the MCR and ask why.
E:MBRATE
is the number of protons per hour on our target. Our goal greater than 8E16 pph !!!
B:BPL5MA
is the 5 minute average power loss in the Booster.
If this value falls below 450 Watts for more than 1/2 hour:
  1. Call the MCR (3721).
  2. Tell the operator your name and that you are on shift at MiniBooNE. Be sure to get the operator's name.
  3. Tell the operator that you noticed the 5 minute power loss average is low, and ask if they could increase the intensity to MiniBooNE. If operations is busy (e.g., the TeV quenched), tell them you will call back in a half hour.
  4. Write down what the operator tells you, and record this in the beamline e-log.
    It is o.k. to ask the operators to repeat themselves -- the opertors use a lot of jargon.

B88 (BLM/Trip Point)

Without Refernece Set

Here is a typical display:

B88 Display NoRef
The same rules apply as for monitoring without the reference set.

With Refernece Set

Here is a typical display:
B88 Display WithRef
A simple rule of thumb is that the losses are not optimal if L10 is not the limiting BLM.  The normalized loss at L10 can be 0.90 for steady state running.  The rest of the normalized losses are typically not run above 0.75.

Every 2 Hours

From a Parameter Page

The devices to look at every two hours are found on E25, DET+M12, < 7>. Here is a typical display:

You will note that there are more devices on this page than on the checklist. You may receive instructions to record these devices in the e-log, or to call an expert if they exceed a given value. Another possibility is that an expert put them there for convenience. Feel free to ask about these.

From Lumberjack

You can also recall the devices using Lumberjack (D44). You can use the "Average/F(x)/channels/sec" feature to get the average value (use caution with this - if there is a period of no beam, it will be counted as zero).

From the "MBoon" "Data Source", "Recall" the list "2hrsmmry1". Here is a display when the beam went away, and then $1D were removed:

A second list, "2hrsmmry2", is also set up to look at beam postion. Here is a display when the beam went away, and then $1D were removed:

These plots are useful when filling out the "Every-2-Hours Shift Checklist"

Every Shift

Shift Summary Plot

Here is a typical shift summary plot:

E:TOR875
Toroid in front of target. This should give the same reading as E:TR875L
E:THCURR
(see above)
E:LM875B
Losses at the donut collimator. This is a limiting aperture for the beamline.
B:BPL5MA
(see above)
E:LM870
Losses at position 870.
E:MBRATE
(see above)
E:BTBT1
Target temperature.
E:TLI864
Losses in the 864 region. The "TLI" stands for "total loss integrator", which means it looks at the losses over a large area, not at a single point.
You will notice that many of these devices are also on the "watch always" list and the "every 2 hours list".

Shift Summary Form

The shift summary form is used to track parameters used by various system experts, mostly Booster. You can find the form here. There is also an ACL script to help you fill out the form -- this script will execute the instructions for B88, but you still need to fill in the form by hand. This is what it looks like when it is filled out:

Shift Summary
17 May 2004
00:00:00 -- owl -- 07:59:00

Percentage Up Time 82
Total Events 114024
Total Protons 4.50E+17
Average Events/Sec 4.03
Average Protons/Event 3.95E+12
Average Protons/Hr 5.70E+16
(p out)/(p in) .848
(Joules lost)/(1E12) 24.3
Down Time
1/2 hour Booster RF problem
1 hour MI access

Daily Summary

Every day, make the "Air Activation" plot and the "Water Levels" plot.


Air Activation Plot:
G:RD1139
air activation as measured leaving the exhaust stack at the upstream end of MI-12A.
If this goes above 400 cpm, contact the machine coordinator.
G:RD1152
air activation as measured in the MI-12 service building.
If this exceeds 100 counts, call the MCR Crew Chief and ask him to contact Radiation Safety
G:RD1153
air activation as measured near the ceiling of MI-12B approximately 20 feet upstream of the front face of the target station.
If this readback exceeds 30000 cpm, contact the machine coordinator.
G:RD1154
MiniBooNE berm heat exchange air activation.
(not active)
G:RD1155
air is pulled from the MI12 service building and through a filter. The rate shown is the reading on the filter.
E:12AAIR
air volume flowing out of the MI-12A exhaust stack. The beam permit system will trip off the beam if the flow falls outside the range of 80 to 120 cfm.
Water Level Plot:
E:W1LVL
upstream pump outside of bathtub.
E:W2LVL
upstream pump between bathtub liners.
E:W3LVL
upstream pump inside of bathtub.
E:WSLVL
sump level in MI12B.
E:W4LVL
downstream pump outside of bathtub.
E:W5LVL
downstream pump between bathtub liners.
E:W6LVL
downstream pump inside of bathtub.
E:WTLVL
Water level in the MI12 400 gallon holding tank.
If this reaches 40%, please call operations and ask if the RSO has been notified. If the answer is "No", then call the machine coordinator.

Once A Week

Beam Permit System Checklist

The Beam Permit System is checked every Sunday afternoon. Follow the instruction on this web page. When you submit the form, it will send e-mail to the machine coordinator.

Details About How We Run

(Still being worked on)


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Last modified: Thr Feb 02 11:05 CST 2005