# Presentation: 569156

## Linac Beam Demands ... Now to 2010 – Primary(based on David Finley and Chuck Ankenbrandt interviewing Elliott McCrory and Arlene Lennox)

- Run II: 1 cycle / 2 second MI ramp now
- With slip stacking might go to 2 cycles / MI ramp
- MiniBooNE: 5 Hz maximum
- How good is this assumption?
- Went from ~2 Hz to 3 Hz recently
- NuMI: 2 x 5 cycles / 2.8 second MI ramp
- 2.8 seconds includes 2 cycles for Run II Stacking also
- The “2 x” assumes slip stacking in the Main Injector

## Linac Beam Demands ... Now to 2010 – Primary(based on David Finley and Chuck Ankenbrandt interviewing Elliott McCrory and Arlene Lennox)

- Run II: 1 cycle / 2 second MI ramp now
- With slip stacking might go to 2 cycles / MI ramp
- MiniBooNE: 5 Hz maximum
- How good is this assumption?
- Went from ~2 Hz to 3 Hz recently
- NuMI: 2 x 5 cycles / 2.8 second MI ramp
- 2.8 seconds includes 2 cycles for Run II Stacking also
- The “2 x” assumes slip stacking in the Main Injector

- This is not a consistent view.

## MUCOOL: 270K cycles/week (if ever; 2/26/03 estimate)
2.98% of (15 x 3600 x 168) = 9,072K cycles / week

Today’s NTF “agreement”: 3 days/week and 1 hour/day
“1 hour” = 12 patients each day @ 5 minutes per patient
66 MeV (not 400 MeV like the others)
Agreement is: “Up to 8 hours on a patient treatment day” & details to be worked out between head of NTF and head of Operations (Arlene Lennox and Bob Mau since ~1985)
3 hours/week is 1.79% of 168 hours per week

- 2.98% of (15 x 3600 x 168) = 9,072K cycles / week
- Today’s NTF “agreement”: 3 days/week and 1 hour/day
- “1 hour” = 12 patients each day @ 5 minutes per patient
- 66 MeV (not 400 MeV like the others)
- Agreement is: “Up to 8 hours on a patient treatment day” & details to be worked out between head of NTF and head of Operations (Arlene Lennox and Bob Mau since ~1985)
- 3 hours/week is 1.79% of 168 hours per week

- Linac Beam Demands ... Now to 2010 - Secondary

## “Beam Maintenance”: 5 days x 20K cycles / day
1.10% of cycles per week

- 1.10% of cycles per week

- Linac Beam Demands ... Now to 2010 - Secondary

## Recent Linac Beam Demands(The 15 days prior to February 26, 2003)

- Average of 180K cycles/day of 400 MeV beam
- 180K cycles/day is 13.89% of 1296K cycles/day
- “The peak number of Linac beam pulses ever was 237784 beam pulses for the 24 hours that ended on 22-Feb-2003, 01:00 (AM).” E. McCrory email 2/27/03. (i.e., 18.3%)
- These 15 days included
- Run II stacking
- The recent increase from ~2 Hz to 3Hz for MiniBooNE running (~ 5 days worth)
- “After” the startup from the “2 week shutdown”
- (But: How many hours of HEP downtime, Dave?)

## Linac Beam Demands

- Linac beam demands are characterized by cycles (or percent of time), not by intensity
- But there can be NTF related “rush hours”
- Caused by need to keep “beam treatment time” minimum
- These have been handled within the Beams Division by head of NTF (Arlene Lennox) and head of Operations (Bob Mau) since 1985.
- Some changes are in the works as we speak.  (Longer linac beam pulse for NTF.)
- In extreme cases, have sent every single 15 Hz linac cycle to NTF until the patient has received the required dose.   (This has been done zero times in the last 2 years).

## Linac Beam Demands:Numerical Summary – Pre-NuMI era

- Note variation in NTF max

- Note: Assume 5 Hz max for MiniBooNE

## Linac Demands: Stacking, MiniBooNE & NTF(provided by E. McCrory)

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| User | Pulses | Rate |
| --- | --- | --- |
| Stacking | 1 | 0.5 Hz |
| MiniBooNE | 10 | 5 Hz |
| NTF | 16 | 8 Hz |
| No Beam | 2 | 1 Hz |

**0 sec**

**1 sec**

**2 sec**

- Stacking at 2.0 seconds (30 cycles)

## Linac Demands: Stacking, MiniBooNE & NTF(provided by E. McCrory; edited by D. Finley)

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| User | Pulses | Rate |
| --- | --- | --- |
| Stacking | 1 | 0.5 Hz |
| MiniBooNE | 10 | 5 Hz |
| NTF | 17 | ~8 Hz |
| No Beam | 2 | 1 Hz |

**0 sec**

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**2 sec**

- Main Injector (Stacking) at 2.0 seconds (30 cycles)

- One “tick” and N needs to be added in this second ...

## Linac Beam Demands:Numerical Summary – Through NuMI era

- Note: Assumes the Main Ring remnant “13 cycle limit” is gone.

- Note: 12/42 = 0.286

## Linac Demands: Stacking, NuMI, MiniBooNE & NTF(provided by E. McCrory)

| User | Pulses | Rate |
| --- | --- | --- |
| Stacking | 2 | 0.7 Hz |
| NuMI | 10 | 3.4 Hz |
| MiniBooNE | 14 | 5 Hz |
| NTF | 14 | 5 Hz |
| No Beam | 2 | 0.7 Hz |

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- Linac Demands: Stacking, NuMI, MiniBooNE & NTF(provided by E. McCrory)

## Linac Beam Demands

- Still to do
- Add SY120 demands
- Establish Realistic Goals
- Make the list of modifications
- Tasks that mostly require Fermilab salaries (i.e., priority) and are “no big deal”
- Tasks that require “some or significant” M&S, beam downtime, or risk

## Summary of Linac

- Radiation Limitations (none foreseen before 2010)
- At the moment most of Linac galleries are unlimited occupancy.  This may need to be changed to limited occupancy as the number of 400 MeV cycles is increased with NuMI + Run II plus MiniBooNE plus ...
- The Booster limits the Linac for 400 MeV beam
- Also, at the moment there is a vestige of the Main Ring buried in the Proton Source which prevents more than 13 linac cycles in a row of beam destined for 8 GeV.  It can be removed.
- The Linac is capable of delivering:
- Run II and MiniBooNE and NuMI and NTF and MUCOOL and Beam Maintenance ... not a problem.
- Unless it runs out of RF tubes ...
- The Linac can run better with modifications.