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Title: Measurement of proton transverse emittance in the Brookhaven AGS

Authors:
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1435737
Report Number(s):
BNL-113467-2018-COPA
DOE Contract Number:
SC0012704
Resource Type:
Conference
Resource Relation:
Conference: 8th International Particle Accelerator Conference (IPAC17), Bella Center, Copenhagen, Denmark, 5/14/2017 - 5/19/2017
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Huang, Haixin. Measurement of proton transverse emittance in the Brookhaven AGS. United States: N. p., 2017. Web.
Huang, Haixin. Measurement of proton transverse emittance in the Brookhaven AGS. United States.
Huang, Haixin. Sun . "Measurement of proton transverse emittance in the Brookhaven AGS". United States. doi:. https://www.osti.gov/servlets/purl/1435737.
@article{osti_1435737,
title = {Measurement of proton transverse emittance in the Brookhaven AGS},
author = {Huang, Haixin},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun May 14 00:00:00 EDT 2017},
month = {Sun May 14 00:00:00 EDT 2017}
}

Conference:
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  • A wide band damper system has been developed for the Brookhaven Alternating Gradient Synchrotron (AGS). The system consists of two sets of PUE pickups, analog and digital processing electronics, four 500 Watt wide band power amplifiers, and two pairs of strip line deflectors. The system is currently used to damp transverse coherent instabilities and injection errors, in both planes, for protons and all species of Heavy Ions. This paper discusses the system design and operation, focusing on the engineering considerations and problems encountered in the actual implementation. Operational data from both protons and Heavy Ion beams is presented.
  • A wide band, digital damper system has been developed and is in use at the Brookhaven Alternating Gradient Synchrotron (AGS). The system consists of vertical and horizontal capacitive pickups, analog and digital processing electronics, four 500 Watt wide band power amplifiers, and two pairs of strip line beam kickers. The system is currently used to damp transverse coherent instabilities and injection errors, in both planes, for protons and all species of heavy ions. This paper discusses the system design and operation, particularly with regard to stabilization of the high intensity proton beam. The analog and digital signal processing techniques usedmore » to achieve optimum results are discussed. Operational data showing the effect of the damping are presented.« less
  • A wide band damper system has been developed for the Brookhaven Alternating Gradient Synchrotron (AGS). The system consists of two sets of PUE pickups, analog and digital processing electronics, four 500 Watt wide band power amplifiers, and two pairs of strip line deflectors. The system is currently used to damp transverse coherent instabilities and injection errors, in both planes, for protons and all species of Heavy Ions. This paper discusses the system design and operation, focusing on the engineering considerations and problems encountered in the actual implementation. Operational data from both protons and Heavy Ion beams is presented.
  • This note is an overview of issues relating to transverse polarized proton emittance in the Booster and AGS. It also compares the transverse emittance during the FY09 polarized proton run with it during the FY06 run as several changes were made for the FY09 run in an attempt to reduce the transverse emittance coming out of the AGS. The FY06 run is used for comparison because it was relatively long, and it's believed that the performance of the injectors for polarized protons, up until FY09, was best during that run. Over the shutdown just before the FY09 run work wasmore » done in LEBT and MEBT to reduce the emittance coming out of the Linac. Measurements of the beam coming out of Linac1 indicate that the horizontal normalized emittance was reduced from 11.0 {pi} to 4.5 {pi}mm mrad, and that the vertical normalized emittance was reduced from 12.1 {pi} to 5.5 {pi} mm mrad going from FY06 to FY09. There were 2 new types of stripping foil installed in the Booster, called descriptively the 'strip' (No.6) and 'stamp' (No.2) foil, both nominally 100 {micro}g/cm{sup 2}. Both foils are composed of a diamond like material, and designed to reduce the number of times the beam goes through the foil. Other than those, there are two standard 100 {micro}g/cm carbon foils (No.3 and 5), and one 200 {micro}g/cm{sup 2} carbon foil (No.4). Of the two 100 {micro}g/cm{sup 2} foils, one has shown some deterioration (No.3) in stripping efficiency. During the FY06 run a standard 100 {micro}g/cm{sup 2} foil was generally used, and during the FY09 run the strip foil was generally used, though the stamp foil was also used for the last 3-4 weeks of the run. Both the FY06 and FY09 runs were about 5 months long, starting in late January, FY06 ending in late June, and FY09 ending in early July. A new injection setup was used for about the last 3 months of FY09, from the beginning of April to the end of the run. This setup uses 1/2 integer stopband correctors with the tunes near, but slightly greater than, 4.5 to distort the {beta} functions at the foil in order to reduce the emittance blowup caused by scattering on the foil. New BtA quad settings, largely based on a MAD model of the BtA line and AGS were used for virtually the entire FY09 run (Feb 5 to the end) in an attempt to improve the matching into the AGS. Since, it has been thought for some time that there is emittance blowup in the vertical due to an injection mismatch. The nominal Linac pulse width was decreased from 400 {micro}s to 300 {micro}s in the latter part of february 09, so the vast majority of the FY09 run used a 300 {micro}s pulse width. The standard pulse width for FY06 was 400 {micro}s. This has some implications for comparing the data from FY06 with that from FY09, but they don't seem insurmountable.« less
  • The AGS accelerator complex is into its third year of 60+ {times} 10{sup 12} (teraproton = Tp) per cycle operation. The hardware making up the complex as configured in 1997 is briefly mentioned. The present level of accelerator performance is discussed. This includes beam transfer efficiencies at each step in the acceleration process, i.e. losses; which are a serious issue at this intensity level. Progress made in understanding beam behavior at the Linac-to-Booster (LtB) injection, at the Booster-to-AGS (BtA) transfer as well as across the 450 ms AGS accumulation porch is presented. The state of transition crossing, with the gamma-trmore » jump is described. Coherent effects including those driven by space charge are important at all of these steps.« less