• R.P. Fliller
  BNL, Upton, Long Island, New York

In­jec­tion into a ring re­quires that the in­ject­ed beam be op­ti­mal­ly matched to the stor­age ring lat­tice. For on axis in­jec­tion this re­quires that the twiss func­tions of the trans­fer line match the twiss func­tions of the lat­tice. When in­jec­tion off axis, as is done in light sources for top off in­jec­tion, the goal is to use the min­i­mum phase space area in the stor­age ring. A. Stre­un* has given an an­a­lyt­i­cal method to com­pute the twiss func­tions for top off in­jec­tion into the SLS where in­jec­tion oc­curs at a beam waist. We have ex­tend­ed his the­o­ry to in­clude cases where there is no beam waist. A sim­ple an­a­lyt­i­cal for­mu­la is not pos­si­ble in this case, how­ev­er we give an al­go­rithm to com­pute the twiss pa­ram­e­ters of the in­ject­ed beam given the stor­age ring lat­tice. We also com­pute the twiss func­tions for a va­ri­ety of cases for the NSLS-II stor­age ring.

* A. Streun. "SLS booster-to-ring transfer line optics for optimum injection effciency". Technical Note SLS-TME-TA-2002-0193. May 27, 2005.

• R.P. Fliller, R. Heese, S. Kowalski, J. Rose, T.V. Shaftan, G.M. Wang
  BNL, Upton, Long Island, New York

The Na­tion­al Syn­chrotron Light Source II (NSLS-II) is a state of the art 3 GeV third gen­er­a­tion light source cur­rent­ly under con­struc­tion at Brookhaven Na­tion­al Lab­o­ra­to­ry. The NSLS-II in­jec­tion sys­tem con­sists of a 200 MeV linac and a 3 GeV boost­er syn­chrotron. The in­jec­tion sys­tem needs to de­liv­er 7.5 nC in 80 - 150 bunch­es to the stor­age ring every minute to achieve cur­rent sta­bil­i­ty goals in the stor­age ring. This is a very strin­gent re­quire­ment that has not been demon­strat­ed at an op­er­at­ing light source, though it should be achiev­able. To al­le­vi­ate the charge re­quire­ment on the linac, we have de­signed a scheme to stack two bunch trains in the boost­er. In this paper we dis­cuss this stack­ing scheme. The per­for­mance of the stack­ing scheme is stud­ied in de­tail at in­jec­tion and through a full boost­er ramp. We show the the ul­ti­mate per­for­mance of the stack­ing scheme is sim­i­lar to a sin­gle bunch train in the boost­er if the linac emit­tance meets the re­quire­ments. In­creas­ing the emit­tance of the linac beam de­grades the per­for­mance, but still al­lows an over­all in­crease of train charge vs. one bunch train.

• R.P. Fliller, W.R. Casey, R. Faussete, H. Fernandes, G. Ganetis, R. Heese, H.-C. Hseuh, P.K. Job, B.N. Kosciuk, R. Meier, D. Padrazo, I. Pinayev, J. Rose, T.V. Shaftan, O. Singh, J. Skaritka, C.J. Spataro, G.M. Wang
  BNL, Upton, Long Island, New York

The NSLS-II in­jec­tion sys­tem con­sists of a 200 MeV linac and a 3 GeV boost­er syn­chrotron and as­so­ci­at­ed trans­port lines. The trans­port lines need to trans­port the beam from the linac to the boost­er and from the boost­er to the stor­age ring in a way that pro­vide high in­jec­tion ef­fi­cien­cy. In this paper we dis­cuss progress on spec­i­fy­ing and pro­to­typ­ing the NSLS-II trans­fer lines in­clud­ing di­ag­nos­tics, mag­net spec­i­fi­ca­tions, and safe­ty sys­tems. Com­mis­sion­ing plans are also dis­cussed.

• A. Blednykh, W.X. Cheng, R.P. Fliller, Y. Kawashima, J. Rose, T.V. Shaftan, L.-H. Yu
  BNL, Upton, Long Island, New York

In this paper, we pre­sent an overview of the im­pact of col­lec­tive ef­fects upon the per­for­mance of the NSLS-II boost­er.

• T.V. Shaftan, A. Blednykh, W.R. Casey, L.R. Dalesio, R. Faussete, M.J. Ferreira, R.P. Fliller, G.S. Fries, G. Ganetis, W. Guo, R. Heese, H.-C. Hseuh, Y. Hu, P.K. Job, E.D. Johnson, Y. Kawashima, B.N. Kosciuk, S. Kowalski, S. Krinsky, Y. Li, H. Ma, R. Meier, S. Ozaki, D. Padrazo, B. Parker, I. Pinayev, M. Rehak, J. Rose, S. Sharma, O. Singh, P. Singh, J. Skaritka, C.J. Spataro, G.M. Wang, F.J. Willeke, L.-H. Yu
  BNL, Upton, Long Island, New York

We dis­cuss sta­tus and plans of de­vel­op­ment of the NSLS-II in­jec­tor. The in­jec­tor con­sists of 200 MeV linac, 3-GeV boost­er, trans­port lines and in­jec­tion straight sec­tion. The sys­tem de­sign is now near­ly com­plet­ed and the in­jec­tor de­vel­op­ment is in the pro­cure­ment phase. The in­jec­tor com­mis­sion­ing is planned to take place in 2012.

• G.M. Wang, R.P. Fliller, W. Guo, R. Heese, T.V. Shaftan, L.-H. Yu
  BNL, Upton, Long Island, New York
• Y.-C. Chao
  TRIUMF, Vancouver

The low beam emit­tance re­quire­ment in the NSLS-II stor­age ring im­pos­es a very tight con­straint on its ac­cep­tance. This re­quires the in­ject­ed beam emit­tance to be very small, for which a re­li­able scheme of mea­sure­ment to de­ter­mine the phase space and mo­men­tum char­ac­ter­is­tics of the beam com­ing out the boost­er is nec­es­sary. The orig­i­nal scheme based on the boost­er-to-dump trans­port line was ham­pered by the dif­fi­cul­ty in de­cou­pling be­ta­tron os­cil­la­tion from dis­per­sion, due to high con­cen­tra­tion of dipoles and lim­it­ed num­ber of quads after the boost­er. This paper will de­scribe the al­ter­na­tive method being planned to use the boost­er ex­trac­tion line to mea­sure the beam emit­tance and en­er­gy spread, as well as the as­so­ci­at­ed er­rors.