1. An Ultracold Neutron Source for TRIUMF
Jeff Martin
University of Winnipeg
TRIUMF Townhall Meeting
Ultracold Neutron Working Group
Aug. 2007
Coconvenors:
Chuck Davis (TRIUMF)
Akira Konaka (TRIUMF)
Yasuhiro Masuda (KEK)

2. International Workshop: UCN Sources and Experiments
Shameless advertising
International Workshop: UCN Sources and Experiments
September 13-14, 2007
TRIUMF, Vancouver, Canada
Registration is free, but please do register
~25 speakers from all over the world
ILL, FRM-II, NCSU, LANL, PSI, KEK, Mainz, ...
Supported by TRIUMF and TUNL

3. Charge (from U. Greife)
1) What is needed at TRIUMF to capitalize on the scientific opportunities currently available?
2) What are the scientific and technological development opportunities at TRIUMF for university and other external groups? (CFI focus)
3) What infrastructure and investment at TRIUMF is needed to meet them next scientific challenges in the next five-year plan? (5YP focus)
As an outcome we would like a white paper from each working group which builds upon the TUG white papers, but additionally provides priorities and suggests which opportunities are to be addressed internally, and which could be met by external users in collaboration with TRIUMF.

4. Outline of White Paper Physics
prioritized and realistic, as much as possible
UCN Source
proposed intensity at TRIUMF
world context and relevance
Required Infrastructure
floorspace and shielding
He liquefier
Required funding
CFI and collaboration, and international

5. Aug. 1
morning - plenary session, charge, and introduction of working groups
12:00 lunch
13:00 Welcome + Charge (Martin) (10+5)
13:15 UCN Sources Worldwide and for TRIUMF (Masuda) (45+10)
14:10 Photofission, (gamma,n) Sources and UCN (Behr) (10+10)
14:30 coffee (30)
15:00 SCRF joint session: Electron Linac Design (Koscielniak) (20+10)
15:30 UCN Infrastructure and Proton Hall Floorplan (Davis) (10+10)
15:50 Proton Hall Radiation Limits (Trudel) (10)
16:00 Discussion (Chair: Davis) (30)
16:30 tour of proton hall? (if desired) (Davis) (30)
Aug. 2
09:00 Continued infrastructure Discussion (60)
10:00 UCN Physics Intro (Martin) (10+5)
10:15 UCN Beta Decay (Melconian) (20+10)
10:45 coffee (30)
11:15 n-EDM (Masuda and/or Hayden?) (20+10)
11:45 radioactive beams (Buchmann) (10+10)
12:05 lunch
13:15 gravity levels (Konaka) (5+10)
13:30 other physics (Martin) (15+10)
13:55 discussion of physics priorities and strategy (chair: Martin) (35)
14:30 begin writing
more joint sessions
draft Aug. 3 morning presentation
Aug. 3
morning - presentations of results from the working groups.
Agenda

6. UCN and SCRF/ISAC interface issues
proposal for UCN (CFI 2008)
10 uA at 25% duty cycle (1 min on, 3 min off)
use BL4A (TISOL)
duty cycle is incompatible with ISAC targets, but may be necessary for low background for UCN experiments
space requirements in proton hall can be managed (diagram to be crafted by Davis, Masuda, et al)
strategy for UCN (after discussions with SCRF/accel)
accept beam on BL4A when ISAC 2nd target station is off, or part-time during target development periods, or when e-linac in operation (This could be a substantial part of the BL4 time initially available.)
accept sole user status in low-intensity periods so that duty cycle can be achieved at source.

7. Future Upgrades (5YP and beyond)
other options for duty cycle
fast kicker + local beam dump in hall
local shielding of dump required
reorganization of proton hall more appropriate to be on same time scale as ISAC 2nd target station
manipulation of internal cyclotron beams
requires further study
carbon stripper with mechanical motion in/out to pulse beam
difficult
other options besides sharing BL4 with ISAC
two stripper foils on same extraction probe + septum
difficult, more appropriate for BL1
BL1, BL5
major reconstruction
(gamma,n)