E907 Installation Meeting Minutes

15 August 2001 Contents

1. Floor Loading
2. MC7 Enclosure
3. JGG Coil Repair
4. Analysis Magnet Locations
5. How to Raise the E907 Beam Elevation
6. Next Meeting

Minutes of P907 meeting on Wednesday August 15, 2001

1. Floor Loading

Elaine ,FESS will review Bob calculations, sketches, etc. regarding the loading on M-bottom. It is expected the FESS will approve Bob work on the subject. Therefore, the plan is for Kilmer to order the steel about August 20th. Dave Erickson at MAB will do the fabrication, Mike Mascione will deliver the pieces into MB and John Voirin will supervise the installation.

Tentative schedule:

August 23rd - start steel shielding removal

August 20th - order steel for MB

August 27th - begin fabrication

September 4th - begin slab installation

September 4th - start lowering steel into MB

September 24th - start JGG installation

2. MC7 Enclosure

Gary Smith has produced a detailed drawing of MC7, the new concrete slab and a drawing showing the new roof height. John Cooper discussed the higher roof with Ken Stanfield. Ken approved the increased height needed to house the experiment.

Cost for the higher roof will be investigated (120 to 150 linear feet of length).

The BM 109s have been removed from MC7. SD has a task order for removing the DS steel shielding. The job is expected to take about 6 days.

3. JGG Coil Repair

Taping of the 2nd layer is in progress. Coil delivery is expected to be mid-September - about 2 weeks behind the original schedule. Chuck is visiting the factory on August 20th.

Chuck also needs to investigate the repair of the one Rosie coil.

4. Analysis Magnet Locations

Raja is fine-tuning the transport so the secondary elements can be located.

Need to develop electronics rack locations and power needs (for one, discriminator racks in PC4 will be used).

5. How to Raise the E907 Beam 31 inches

14 Aug 2001

C. T. Murphy

Because the centerline of JGG will be 80.5" above the floor of MC-7 (see Beverly minutes of meeting of Aug. 1), but the primary proton beam is only 49.5" off the floor (Cat James prints), we have to bend the primary beam up and the secondary beam down so that the final elevation of the secondary beam is 31" higher than at present. Also, the final angle of the secondary beam must be zero vertically in order to avoid the nuisance of having the experiment on an upward slope (such as our predecessors put up with).

The solution of this problem was easier than I expected, took only a few hours. Here are the steps.

1. Put an upbend in the primary proton beam with two EPB dipoles about 1/3 of the way into MC 5 enclosure (bend point near the end of the 5th quad in the 800 GeV layout). I have an exact location. The bend angle is twice that of each of the dispersion dipoles in the secondary beam.
2. Put the dispersion dipoles of the secondary beam in the VERTICAL plane, and have them both bend down, so that they bring the secondary beam back to theta-v = 0.
3. Move the second of the disperion dipoles to DOWNSTREAM of the momentum collimator so that momentum recombination at the P907 target is still approximately achieved.

In my quantitative work on this matter, I consulted Raja on the latest position of JGG, left 12 feet empty space upstream of it, and then used Hartouni's transport file to layout the beamline including the Cerenkov counters & beam counters & beam chambers.

The only remaining problem with this solution is that the two EPB dipoles which bend the primary beam up are at about the same location where we need quads to focus the beam on the secondary beam target. I will now undertake to determine where the quadrupole doublet which focuses on that target needs to be, then the two EPB dipoles can be rearranged to give the same 31" offset at the end of the secondary beam.

Input that I need from the rest of you: what size spot would you like on the secondary beam target for:

• 120 GeV: NuMI simulation
• lower momenta: scaling studies

I have put this in writing, unusual for me, largely because Hartouni is on vacation, and it is important that he understand and critique my solution.

6. Next Meeting

The next meeting will be Wednesday, August 22nd, Theory Room, WH3NE at 10:30AM.