Wednesday August 7, 2013

We will meet in TED 2561B on Wednesday August 7 at 3:00 pm EST.

For those calling in we'll use the ReadyTalk audio conference system.

1. Dial Toll-Free Number: 866-740-1260 (U.S. & Canada)
2. Enter 7-digit access code 4402297, followed by “#”

Agenda:

 media:Meeting_7August_2013.pdf
 media:Meeting_7August_2013.pptx  

1- Bubble Chamber progress at Argonne

2- Beam Heating in Cu Radiator media:Beam_Heating_in_Cu_Radiator.pptx media:Beam_Heating_in_Cu_Radiator.pdf

3- Beamline Layout

4- Bubble Chamber cost estimate: procurement and labor

5- Background from ¹⁷O(γ,n)¹⁶O and subsequent neutron elastic scattering with ¹⁶O and ¹⁴N nuclei

6- Background from ¹³C(γ,n)¹²C (in case we decide to use CO₂ instead of N₂O)

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Notes from this meeting:

• Beamline Layout:

- Need a Faraday Cup on the Bubble Chamber beamline, after the second BPM and before the radiator
- On the main beamline, FC2 is a 1 kW dump (200 µA and 5 MeV)
- PEPPo took positron data with Quads OFF and electron data with Quads ON
- What is the trip limit of the Fast Valve and how fast is it?
- The Bubble Chamber experiment needs electron beam with KINETIC ENERGY = 8.5 MeV
- At Jefferson Lab, an egress has a minimum clearance of 36 inches
- We can use two Super Harps instead of the two Quads. Unfortunately, the accelerator does not have Super Harps, 
and it costs $10,000 each. 
- Electron Dump: isolated to measure beam current, 2 kW
- Plan to have both BCM0L02 and Electron Dump in Beam Loss Accounting (BLA)
- The photon Cu collimator has a hole of 1.0 cm diameter
- The only Fast Valve in the Injector is located just downstream of the Injector Gate (VFV0L04).
- Fast Valve closes in 30 ms and comes with it own vacuum gauge that can be installed separately on the beamline.
 The valve and its electronics cost $10,000 

• Cost:

- Procurement overhead is 25% and for labor it is 1.50

• Simulations and Backgrounds:

- Try to distinguish between (γ,n) and (γ,n) events using the acoustic signal