Download - ATRAP A ntihydrogen TRAP ping
![Page 1: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/1.jpg)
ATRAPAntihydrogen TRAPping
Eric Lindsey
Reed College
Dr. Gerald Gabrielse, Dr. Jonathan Wrubel
University of Michigan / CERN REU Program
8 August, 2007
![Page 2: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/2.jpg)
8 August 2007 Eric Lindsey 2
Overview
• Antimatter– CERN’s Antiproton Decelerator (AD)– Why Antihydrogen?– Trapping Challenges
• XY Moveable Stage– Design– Implementation– Testing
• Trap Installation
![Page 3: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/3.jpg)
8 August 2007 Eric Lindsey 3
Antimatter: The AD
•PS delivers 26 GeV protons•Reaction:
p + p p + p + p + p•AD slows p to 5.3 MeV
(Stochastic; RF cooling)•Delivers 3 x 107 p every 100 sec
![Page 4: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/4.jpg)
8 August 2007 Eric Lindsey 4
Antimatter: Why H?
• CPT comparison with hydrogen; 1 part in 1012-15 !
Source: Gabrielse 2005
• Not an easy goal. Need:–Cold Antihydrogen (ground state)–Coherent Lyman- source (121.6 nm)
• Current baryon precision: 10-9
![Page 5: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/5.jpg)
8 August 2007 Eric Lindsey 5
How to Trap H
Exploit hyperfine levels of the 1S state.
(Wavelength: 21 cm)
An (anti)atom is neutral! Electric fields won’t work...
Source: Larochelle 2007Reported for Hydrogen:H. F. Hess, G. P. Kochanski, J. M. Doyle, N. Masuhara, D. Kleppner, and T. J. Greytak, Phys. Rev. Lett 59, 672 (1987).
![Page 6: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/6.jpg)
8 August 2007 Eric Lindsey 6
Need a magnetic minimum in all directions.
Solution: The Ioffe Trap
Radial: Quadrupole Axial: Pinch coils
![Page 7: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/7.jpg)
8 August 2007 Eric Lindsey 7
Add (solenoidal) Penning trap field to the Ioffe trap fields:
Magnetic Field trouble
+ =Lost Particles!
![Page 8: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/8.jpg)
8 August 2007 Eric Lindsey 8
Magnetic Field trouble
Octupole has a larger trapping region.
May or may not be an advantage.
CTRAP!
![Page 9: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/9.jpg)
8 August 2007 Eric Lindsey 9
Project: XY Stage
Moveable stage controls positron, electron loading.
Problem:
Where is the
stage located?
? ?
Solution:
Potentiometer
LEDs / Photodiode
Thanks to A. Pich
![Page 10: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/10.jpg)
8 August 2007 Eric Lindsey 10
XY Stage: Position
Potentiometer: 4-Wire resistance measurement
RPot=(-VARB)/VB
LEDs and Photodiode:
Vout is nonzero when photodiode receives a signal (in front of LED)
![Page 11: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/11.jpg)
8 August 2007 Eric Lindsey 11
XY Stage: Design
•Input: 32-pin cable from experiment•Output: 6 Chassis-Isolated BNCs•Constructed mostly with components I scrounged from the lab•Communicates via TCP/IP with LabVIEW (not yet)
![Page 12: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/12.jpg)
8 August 2007 Eric Lindsey 12
XY Stage: Testing
Results: Percent Error by Channel
0
1
2
3
4
5
0 1000 2000 3000 4000
Resistance (Ohms)
% Error
X Y
Potentiometer: consistently too high (calibration)
Off by 2.40.3%
Uncertainty: 0.2 mm
Photodiode works!Signal ~100mV, background ~1mVPeak width 1.10.1 mm (FWHM)
![Page 13: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/13.jpg)
8 August 2007 Eric Lindsey 13
Trap Installation
Leak fixed!
![Page 14: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/14.jpg)
Cultural Immersion!
![Page 15: ATRAP A ntihydrogen TRAP ping](https://reader036.vdocuments.us/reader036/viewer/2022062409/56815164550346895dbf909e/html5/thumbnails/15.jpg)
8 August 2007 Eric Lindsey 15
Thanks!
Jean Krisch, Homer Neal, Steven Goldfarb, Jeremy Herr
ATRAP Collaboration -- Gerald Gabrielse, Jonathan Wrubel, Ben Levitt, and the rest of the collaboration!
U. Michigan, NSF, CERN Summer Program, Ford
Many thanks to